10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

þ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2012 or

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                     to                     

Commission file number: 1-31465

NATURAL RESOURCE PARTNERS L.P.

(Exact name of registrant as specified in its charter)

Delaware	35-2164875
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)
601 Jefferson, Suite 3600 Houston, Texas (Address of principal executive offices)	77002 (Zip Code)

(713) 751-7507

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Name of each exchange on which registered
Common Units representing limited partnership interests	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:

None.

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  þ        No  ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨        No  þ

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  þ        No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  þ        No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.    þ

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

þ  Large Accelerated Filer ¨  Accelerated Filer ¨  Non-accelerated Filer ¨   Smaller Reporting Company

Indicate by check mark whether the registrant is a shell company (as defined in Exchange Act Rule 12b-2)    Yes  ¨        No  þ

The aggregate market value of the Common Units held by non-affiliates of the registrant (treating all executive officers and directors of the registrant and holders of 10% or more of the Common Units outstanding, for this purpose, as if they were affiliates of the registrant) was approximately $1.3 billion on June 30, 2012 based on a price of $22.17 per unit, which was the closing price of the Common Units as reported on the daily composite list for transactions on the New York Stock Exchange on that date.

As of February 28, 2013, there were 109,812,408 Common Units outstanding.

DOCUMENTS INCORPORATED BY REFERENCE.

None.

Table of Contents

Item			Page
	PART I
	1.	Business		2
	1A.	Risk Factors		12
	1B.	Unresolved Staff Comments		22
	2.	Properties		23
	3.	Legal Proceedings		34
	4.	Mine Safety Disclosures		34
	PART II
	5.	Market for Registrant’s Common Equity, Related Unitholder Matters and Issuer Purchases of Equity Securities		35
	6.	Selected Financial Data		36
	7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		37
	7A.	Quantitative and Qualitative Disclosures About Market Risk		53
	8.	Financial Statements and Supplementary Data		54
	9.	Changes In and Disagreements with Accountants on Accounting and Financial Disclosure		76
	9A.	Controls and Procedures		76
	9B.	Other Information		77
	PART III
	10.	Directors and Executive Officers of the General Partner and Corporate Governance		78
	11.	Executive Compensation		84
	12.	Security Ownership of Certain Beneficial Owners and Management and Related Unitholder Matters		92
	13.	Certain Relationships and Related Transactions, and Director Independence		93
	14.	Principal Accounting Fees and Services		100
	PART IV
	15.	Exhibits, Financial Statement Schedules		103

Forward-Looking Statements

Statements included in this Form 10-K may constitute forward-looking statements. In addition, we and our representatives may from time to time make other oral or written statements which are also forward-looking statements.

Such forward-looking statements include, among other things, statements regarding capital expenditures and acquisitions, expected commencement dates of mining, projected quantities of future production by our lessees producing from our reserves, and projected demand or supply for coal, aggregates and oil and gas that will affect sales levels, prices and royalties realized by us.

These forward-looking statements speak only as of the date hereof and are made based upon management’s current plans, expectations, estimates, assumptions and beliefs concerning future events impacting us and therefore involve a number of risks and uncertainties. We caution that forward-looking statements are not guarantees and that actual results could differ materially from those expressed or implied in the forward-looking statements.

You should not put undue reliance on any forward-looking statements. Please read “Item 1A. Risk Factors” for important factors that could cause our actual results of operations or our actual financial condition to differ.

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PART I

Item 1. Business

We are a limited partnership formed in April 2002, and we completed our initial public offering in October 2002. We engage principally in the business of owning, managing and leasing mineral properties in the United States. We own coal reserves in the three major U.S. coal-producing regions: Appalachia, the Illinois Basin and the Western United States, as well as lignite reserves in the Gulf Coast region. As of December 31, 2012, we owned or controlled approximately 2.4 billion tons of proven and probable coal reserves, and we also owned approximately 500 million tons of aggregate reserves in a number of states across the country. We do not operate any mines, but lease our reserves to experienced mine operators under long-term leases that grant the operators the right to mine and sell our reserves in exchange for royalty payments. Our lessees are generally required to make payments to us based on the higher of a percentage of the gross sales price or a fixed price per ton, in addition to minimum payments.

In 2012, our lessees produced 54.4 million tons of coal from our properties and our coal royalty revenues were $260.7 million. Processing fees and transportation fees added $27.8 million to our total revenues. In addition, we received $9.2 million in oil and gas royalties, and our lessees produced 5.3 million tons of aggregates resulting in aggregate royalties of $6.6 million.

Partnership Structure and Management

Our operations are conducted through, and our operating assets are owned by, our subsidiaries. We own our subsidiaries through a wholly owned operating company, NRP (Operating) LLC. NRP (GP) LP, our general partner, has sole responsibility for conducting our business and for managing our operations. Because our general partner is a limited partnership, its general partner, GP Natural Resource Partners LLC, conducts its business and operations, and the board of directors and officers of GP Natural Resource Partners LLC makes decisions on our behalf. Robertson Coal Management LLC, a limited liability company wholly owned by Corbin J. Robertson, Jr., owns all of the membership interest in GP Natural Resource Partners LLC. Subject to the Investor Rights Agreement with Adena Minerals, LLC, Mr. Robertson is entitled to nominate nine directors, five of whom must be independent directors, to the board of directors of GP Natural Resource Partners LLC. Mr. Robertson has delegated the right to nominate two of the directors, one of whom must be independent, to Adena Minerals.

The senior executives and other officers who manage NRP are employees of Western Pocahontas Properties Limited Partnership and Quintana Minerals Corporation, companies controlled by Mr. Robertson, and they allocate varying percentages of their time to managing our operations. Neither our general partner, GP Natural Resource Partners LLC, nor any of their affiliates receive any management fee or other compensation in connection with the management of our business, but they are entitled to be reimbursed for all direct and indirect expenses incurred on our behalf.

Our operations headquarters is located at 5260 Irwin Road, Huntington, West Virginia 25705 and the telephone number is (304) 522-5757. Our principal executive office is located at 601 Jefferson Street, Suite 3600, Houston, Texas 77002 and our phone number is (713) 751-7507.

Royalty Business

Royalty businesses principally own and manage mineral reserves. As an owner of mineral reserves, we typically are not responsible for operating on our properties, but instead enter into leases with operators granting them the right to mine and sell reserves from our property in exchange for a royalty payment. A typical lease has a 5- to 10-year base term, with the lessee having an option to extend the lease for additional terms. Leases may include the right to renegotiate rents and royalties for the extended term.

Under our standard lease, lessees calculate royalty payments due us and are required to report tons of coal or aggregates removed as well as the sales prices of the extracted minerals. Therefore, to a great extent, amounts reported as royalty revenue are based upon the reports of our lessees. We periodically audit this information by examining certain records and internal reports of our lessees, and we perform periodic mine inspections to verify that the information that our lessees have submitted to us is accurate. Our audit and inspection processes are

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designed to identify material variances from lease terms as well as differences between the information reported to us and the actual results from each property. Our audits and inspections, however, are in periods subsequent to when the revenue is reported and any adjustment identified by these processes might be in a reporting period different from when the royalty revenue was initially recorded.

Our royalty revenues are affected by changes in long-term and spot commodity prices, production volumes, unseasonal weather, lessees’ supply contracts and the royalty rates in our leases. The prevailing prices for coal and oil and gas depend on a number of factors, including the supply-demand relationship, the price and availability of alternative fuels, global economic conditions and governmental regulations. The prevailing price for aggregates generally depends on local economic conditions. In addition to their royalty obligation, our lessees are often subject to pre-established minimum monthly, quarterly or annual payments. These minimum rentals reflect amounts we are entitled to receive even if no mining activity occurred during the period. Minimum rentals are usually credited against future royalties that are earned as minerals are produced. We do not typically receive minimum royalties with respect to our oil and gas properties, but do typically receive bonus payments at the time of execution of the lease.

Because we do not operate any mines, we do not bear ordinary operating costs and have limited direct exposure to environmental, permitting and labor risks. As operators, our lessees are subject to environmental laws, permitting requirements and other regulations adopted by various governmental authorities. In addition, the lessees generally bear all labor-related risks, including retiree health care legacy costs, black lung benefits and workers’ compensation costs associated with operating the mines on our coal and aggregate properties. We typically pay property taxes on our properties, which are then reimbursed by the lessee pursuant to the terms of the lease.

Our business is not seasonal, although at times severe or abnormal weather can cause a short-term decrease in production by our lessees due to the weather’s negative impact on production and transportation.

Acquisitions

We are a growth-oriented company and have completed a number of acquisitions. For a discussion of our recent acquisitions, please see “Recent Acquisitions” in “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Coal Royalty Revenues, Reserves and Production

The following summary table sets forth coal royalty revenues and average coal royalty revenue per ton from the properties that we owned or controlled for the years ending December 31, 2012, 2011 and 2010. Coal royalty revenues were generated from the properties in each of the areas as follows:

	Coal Royalty Revenues For the Years Ended December 31,						Average Coal Royalty Revenue Per Ton For the Years Ended December 31,
	2012		2011		2010		2012		2011		2010
	(In thousands)						($ per ton)
Area
Appalachia
Northern	$	15,768	$	20,578	$	18,676	$	1.50	$	3.92	$	3.81
Central		156,390		196,789		144,934	$	5.99	$	6.66	$	5.36
Southern		29,325		11,717		19,405	$	7.89	$	6.91	$	6.87
Total Appalachia		201,483		229,084		183,015	$	5.00	$	6.28	$	5.26
Illinois Basin		49,538		41,324		30,210	$	4.38	$	4.38	$	3.90
Northern Powder River Basin		8,501		7,658		8,444	$	3.58	$	2.86	$	1.89
Gulf Coast		1,212		1,155		92	$	2.60	$	2.21	$	1.77
Total	$	260,734	$	279,221	$	221,761	$	4.79	$	5.68	$	4.71

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The following summary table sets forth coal production data and reserve information for the properties that we owned or controlled for the years ending December 31, 2012, 2011 and 2010. All of the reserves reported below are recoverable reserves as determined by Industry Guide 7. In excess of 90% of the reserves listed below are currently leased to third parties. Coal production data and reserve information for the properties in each of the areas are as follows:

Coal Production and Reserves

	Production for the Year Ended December 31,						Proven and Probable Reserves at December 31, 2012
	2012		2011		2010		Underground		Surface		Total
	(Tons in thousands)
Area
Appalachia
Northern		10,486		5,251		4,900		489,635		29,381		519,016
Central		26,098		29,555		27,056		1,040,883		221,123		1,262,006
Southern		3,718		1,695		2,824		95,824		25,063		120,887
Total Appalachia		40,302		36,501		34,780		1,626,342		275,567		1,901,909
Illinois Basin		11,299		9,445		7,753		353,182		14,039		367,221
Northern Powder River Basin		2,377		2,682		4,467		—		99,780		99,780
Gulf Coast		466		523		52		—		4,672		4,672
Total		54,444		49,151		47,052		1,979,524		394,058		2,373,582

We classify low sulfur coal as coal with a sulfur content of less than 1.0%, medium sulfur coal as coal with a sulfur content between 1.0% and 1.5% and high sulfur coal as coal with a sulfur content of greater than 1.5%. Compliance coal is coal which meets the standards of Phase II of the Clean Air Act and is that portion of low sulfur coal that, when burned, emits less than 1.2 pounds of sulfur dioxide per million Btu. As of December 31, 2012, approximately 49% of our reserves were low sulfur coal and 33% of our reserves were compliance coal. Unless otherwise indicated, we present the quality of the coal throughout this Form 10-K on an as-received basis, which assumes 6% moisture for Appalachian reserves, 12% moisture for Illinois Basin reserves and 25% moisture for Northern Powder River Basin reserves. We own both steam and metallurgical coal reserves in Northern, Central and Southern Appalachia, and we own steam coal reserves in the Illinois Basin and the Northern Powder River Basin. In 2012, approximately 32% of the production and 44% of the coal royalty revenues from our properties were from metallurgical coal.

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The following table sets forth our estimate of the sulfur content, the typical quality of our coal reserves and the type of coal in each area as of December 31, 2012.

Sulfur Content, Typical Quality and Type of Coal

			Sulfur Content
			Low		Medium		High				Typical Quality
	Compliance		(less than		(1.0% to		(greater				Heat Content		Sulfur		Type of Coal
Area	Coal(1)		1.0%)		1.5%)		than 1.5%)		Total		(Btu per pound)		(%)		Steam		Metallurgical(2)
	(Tons in thousands)										(Tons in thousands)
Appalachia
Northern		50,658		73,387		24,466		421,163		519,016		12,836		2.61		509,454		9,562
Central		637,363		895,988		315,002		51,016		1,262,006		13,273		0.89		869,852		392,154
Southern		83,548		89,612		27,977		3,298		120,887		13,507		0.82		79,827		41,060
Total Appalachia		771,569		1,058,987		367,445		475,477		1,901,909		13,168		1.35		1,459,133		442,776
Illinois Basin		—		—		2,230		364,991		367,221		11,507		3.26		367,221		—
Northern Powder River Basin		—		99,780		—		—		99,780		8,800		0.65		99,780		—
Gulf Coast		185		4,672		—		—		4,672		6,949		0.69		4,487		185
Total		771,754		1,163,439		369,675		840,468		2,373,582						1,930,621		442,961

(1) Compliance coal meets the sulfur dioxide emission standards imposed by Phase II of the Clean Air Act without blending with other coals or using sulfur dioxide reduction technologies. Compliance coal is a subset of low sulfur coal and is, therefore, also reported within the amounts for low sulfur coal.

(2) For purposes of this table, we have defined metallurgical coal reserves as reserves located in those seams that historically have been of sufficient quality and characteristics to be able to be used in the steel making process. Some of the reserves in the metallurgical category can also be used as steam coal.

We have engaged outside consultants to conduct reserve studies of our existing properties. These studies are an ongoing process and we will update the reserve studies based on our review of the following factors: the size of the properties, the amount of production that has occurred, or the development of new data which may be used in these studies. In connection with most acquisitions, we have either commissioned new studies or relied on recent reserve studies completed prior to the acquisition. In addition to these studies, we base our estimates of reserve information on engineering, economic and geological data assembled and analyzed by our internal geologists and engineers. There are numerous uncertainties inherent in estimating the quantities and qualities of recoverable reserves, including many factors beyond our control. Estimates of economically recoverable coal reserves depend upon a number of variable factors and assumptions, any one of which may, if incorrect, result in an estimate that varies considerably from actual results. Some of these factors and assumptions include:

• future coal prices, mining economics, capital expenditures, severance and excise taxes, and development and reclamation costs;

• future mining technology improvements;

• the effects of regulation by governmental agencies; and

• geologic and mining conditions, which may not be fully identified by available exploration data and may differ from our experiences in other areas of our reserves.

As a result, actual coal tonnage recovered from identified reserve areas or properties may vary from estimates or may cause our estimates to change from time to time. Any inaccuracy in the estimates related to our reserves could result in royalties that vary from our expectations.

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Transportation and Processing Revenues

We own preparation plants and related material handling facilities. Similar to our royalty structure, the throughput fees for the use of these facilities are based on a percentage of the ultimate sales price for the material that is processed. These facilities generated $8.3 million in processing revenues for 2012.

In addition to our preparation plants, we own handling and transportation infrastructure related to our coal and aggregate properties. For the year ended December 31, 2012, we recognized $19.5 million in revenue from these assets. We typically lease this infrastructure to third parties and collect throughput fees; however, at the loadout facility at the Williamson mine in Illinois, we operate the coal handling and transportation infrastructure and have subcontracted out that responsibility to a third party.

Aggregates Royalty Revenues, Reserves and Production

We own and manage aggregate reserves, but do not engage in the mining, processing or sale of aggregate related products. We own approximately 500 million tons of aggregate reserves located in a number of states across the country. During 2012, our lessees produced 5.3 million tons of aggregates, and our aggregate royalties were $6.6 million.

Oil and Gas Properties

We generated $9.2 million, or 2% of our total revenues, from approximately 494,000 net leased oil and gas mineral acres in 2012. Our oil and gas royalty revenue is primarily derived from lease bonus payments, oil and gas royalty interests and overriding royalty interests paid to us from the lessees. We have leased our mineral interests to third parties for the exploration and production of oil and gas, principally in the Appalachian Basin, Louisiana and Oklahoma. In addition, we own an overriding royalty on approximately 88,000 net mineral acres in the Marcellus Shale. When we lease our mineral interests, we may negotiate a lease bonus payment and retain a royalty interest. We are not an operator with respect to any of the oil and gas activities on our properties. In addition to our leased acres, a large portion of our mineral acres contain yet undetermined commercial potential and are available to be leased and may contribute revenue in the future.

Significant Customers

In 2012, we had total revenues of $92.3 million from Foresight Energy and other Cline affiliates and $81.1 million from Alpha Natural Resources. Each of these lessees represented more than 10% of our total revenues. The loss of one or both of these lessees could have a material adverse effect on us. In addition, the closure or loss of revenue from Foresight’s Williamson mine, which accounted for 12.4% of our revenue in 2012, could have a material adverse effect on us, but we do not believe that the loss of any other single mine on our properties would have a material adverse effect on our revenues or distributable cash flow.

Competition

We face competition from other land companies, coal producers, international steel companies and private equity firms in purchasing coal reserves and royalty producing properties. Numerous producers in the coal industry make coal marketing intensely competitive. Our lessees compete among themselves and with coal producers in various regions of the United States for domestic sales. The industry has recently undergone significant consolidation. This consolidation has led to a number of our lessees’ parent companies having significantly larger financial and operating resources than their competitors. Our lessees compete with both large and small producers nationwide on the basis of coal price at the mine, coal quality, transportation cost from the mine to the customer and the reliability of supply. Continued demand for our coal and the prices that our lessees obtain are also affected by demand for electricity and steel, as well as government regulations, technological developments and the availability and the cost of generating power from alternative fuel sources, including nuclear, natural gas and hydroelectric power.

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Regulation and Environmental Matters

General. Our lessees are obligated to conduct mining operations in compliance with all applicable federal, state and local laws and regulations. These laws and regulations include matters involving the discharge of materials into the environment, employee health and safety, mine permits and other licensing requirements, reclamation and restoration of mining properties after mining is completed, management of materials generated by mining operations, surface subsidence from underground mining, water pollution, legislatively mandated benefits for current and retired coal miners, air quality standards, protection of wetlands, plant and wildlife protection, limitations on land use, storage of petroleum products and substances which are regarded as hazardous under applicable laws and management of electrical equipment containing PCBs. Because of extensive and comprehensive regulatory requirements, violations during mining operations are not unusual and, notwithstanding compliance efforts, we do not believe violations by our lessees can be eliminated entirely. However, to our knowledge none of the violations to date, nor the monetary penalties assessed, have been material to our lessees. We do not currently expect that future compliance will have a material effect on us.

While it is not possible to quantify the costs of compliance by our lessees with all applicable federal, state and local laws and regulations, those costs have been and are expected to continue to be significant. The lessees post performance bonds pursuant to federal and state mining laws and regulations for the estimated costs of reclamation and mine closures, including the cost of treating mine water discharge when necessary. We do not accrue for such costs because our lessees are both contractually liable and liable under the permits they hold for all costs relating to their mining operations, including the costs of reclamation and mine closures. Although the lessees typically accrue adequate amounts for these costs, their future operating results would be adversely affected if they later determined these accruals to be insufficient. In recent years, compliance with these laws and regulations has substantially increased the cost of coal mining for all domestic coal producers.

In addition, the electric utility industry, which is the most significant end-user of coal, is subject to extensive regulation regarding the environmental impact of its power generation activities, which could affect demand for coal mined by our lessees. The possibility exists that new legislation or regulations could be adopted that have a significant impact on the mining operations of our lessees or their customers’ ability to use coal and may require our lessees or their customers to change operations significantly or incur substantial costs that could impact us.

Air Emissions. The Federal Clean Air Act and corresponding state and local laws and regulations affect all aspects of our business. The Clean Air Act directly impacts our lessees’ coal mining and processing operations by imposing permitting requirements and, in some cases, requirements to install certain emissions control equipment, on sources that emit various hazardous and non-hazardous air pollutants. The Clean Air Act also indirectly affects coal mining operations by extensively regulating the air emissions of coal-fired electric power generating plants. There have been a series of federal rulemakings that are focused on emissions from coal-fired electric generating facilities. Installation of additional emissions control technologies and other measures required under U.S. Environmental Protection Agency (EPA) regulations will make it more costly to operate coal-fired power plants and, depending on the requirements of individual state and regional implementation plans, could make coal a less attractive fuel source in the planning and building of power plants in the future. Any reduction in coal’s share of power generating capacity could negatively impact our lessees’ ability to sell coal, which would have a material effect on our coal royalty revenues.

In March 2005, the EPA issued a final Clean Air Interstate Rule (CAIR), which caps nitrogen oxide and sulfur dioxide emissions in 28 eastern states and Washington, D.C. Since a majority of controls required by the CAIR have been installed, we believe that the financial impact of the CAIR on coal markets has been factored into the price of coal nationally and that its impact on demand has largely been taken into account by the marketplace. However, in response to a remand of CAIR by the Court of Appeals for the D.C. Circuit on July 11, 2008, the EPA on August 8, 2011 adopted a replacement program, called the Cross-State Air Pollution Rule (CSAPR), which is both broader in its geographic coverage and deeper in emission reductions than required by CAIR. The CSAPR, in turn, was vacated by opinion of the D.C. Circuit on August 21, 2012. Although the mandate has not yet issued pending disposition of petitions for rehearing, CSAPR remains unenforceable, and is not likely to be reinstated; rather, all state regulations that were based on the CAIR are still in effect. We are

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unable to predict whether further judicial review proceedings may reinstate CSAPR or what rules EPA may be proposed in the event that the vacatur takes full legal effect, and, therefore, unable to predict any effect on NRP.

In June 2005, the EPA announced final amendments to its regional haze program originally developed in 1999 to improve visibility in national parks and wilderness areas. Under the Regional Haze Rule, affected states were to have developed implementation plans by December 17, 2007, that, among other things, identify facilities that will have to reduce emissions and comply with stricter emission limitations. The vast majority of states failed to submit their plans by December 17, 2007, and the EPA issued a Finding of Failure to Submit plans on January 15, 2009. On May 30, 2012, the EPA Administrator signed a final rule under which the emission caps imposed under the CSAPR for a given state would supplant the obligations of that state with regard to visibility protection. EPA’s plans to revisit this rule in light of the vacatur of the CSAPR have yet to be announced.

On December 16, 2011, the EPA Administrator signed the “Mercury and Air Toxics Rule,” which will impose limits on the hazardous air pollutant emissions allowed for the nation’s existing and future coal-fueled generation fleet. The limits imposed by those rules may limit demand for or otherwise restrict sales of our lessees’ coal, which would reduce royalty revenues.

Other continued tightening of the already stringent regulation of emissions is likely, such as the EPA’s revision to the national ambient air quality standard for sulfur dioxide finalized June 22, 2010. As a result of these and other tightening of ambient air quality standards, some states will be required to amend their existing state implementation plans to attain and maintain compliance with the new air quality standards. These plan revisions may call for significant additional emission control at coal-fired power plants.

The U.S. Department of Justice, on behalf of the EPA, has filed lawsuits against a number of utilities with coal-fired electric generating facilities alleging violations of the new source review provisions of the Clean Air Act. The EPA has alleged that certain modifications have been made to these facilities without first obtaining permits issued under the new source review program. Several of these lawsuits have settled, but others remain pending. Depending on the ultimate resolution of these cases, demand for our coal could be affected, which could have an adverse effect on our coal royalty revenues.

Carbon Dioxide and Greenhouse Gas Emissions. In December 2009, the EPA determined that emissions of carbon dioxide, methane, and other greenhouse gases, or “GHGs,” present an endangerment to public health and welfare because emissions of such gases are, according to the EPA, contributing to warming of the earth’s atmosphere and other climatic changes. Legal challenges to these findings have been rejected by the D.C. Circuit Court of Appeals, and we cannot predict the outcome of impending petitions to the Supreme Court. Based on its findings, the EPA has begun adopting and implementing regulations to restrict emissions of GHGs under various provisions of the Clean Air Act. Shortly after issuing its finding, EPA adopted rules regulating GHG emissions from motor vehicles, and other rules requiring permits for emissions of GHGs from many stationary sources, including coal-fired electric power plants, effective January 2, 2011. The EPA has also adopted rules requiring the reporting of GHG emissions from specified large GHG emission sources in the United States, including coal-fired electric power plants, on an annual basis, beginning in 2011 for emissions occurring after January 1, 2010, as well as certain oil and natural gas production facilities, on an annual basis, beginning in 2012 for emissions occurring in 2011. As a result of revisions to its preconstruction permitting rules that became fully effective on January 2, 2011, the EPA is now requiring new sources, including coal-fired power plants, to undergo control technology reviews for GHGs (predominately carbon dioxide) as a condition of permit issuance. These reviews may impose limits on GHG emissions, or otherwise be used to compel consideration of alternative fuels and generation systems, as well as increase litigation risk for — and so discourage development of — coal-fired power plants.

In addition, in March 2012, the EPA proposed “new source performance standards” to govern GHG emissions from electric generating units, including those fired by coal. The proposal, if adopted, would in effect prohibit the construction of new coal-fired power plants, because it would require them to meet the same GHG emission rate as a comparably sized gas-fired power plant. The consent decree also represents the EPA’s agreement to consider adopting a GHG limitation program governing existing sources, as well, which the EPA may attempt to use to establish a cap-and-trade-like system on emissions of power plants’ GHG emissions. The EPA continues to delay any such proposal.

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Several states have also either passed legislation or announced initiatives focused on decreasing or stabilizing carbon dioxide emissions associated with the combustion of fossil fuels, and many of these measures have focused on emissions from coal-fired electric generating facilities. Other regional programs are being considered in several regions of the country. It is possible that future federal and state initiatives to control carbon dioxide emissions could result in increased costs associated with coal consumption, such as costs to install additional controls to reduce carbon dioxide emissions or costs to purchase emissions reduction credits to comply with future emissions trading programs. Such increased costs for coal consumption could result in some customers switching to alternative sources of fuel, which could negatively impact our lessees’ coal sales, and thereby have an adverse effect on our coal royalty revenues.

Surface Mining Control and Reclamation Act of 1977. The Surface Mining Control and Reclamation Act of 1977 (SMCRA) and similar statutes enacted and enforced by the states impose on mine operators the responsibility of reclaiming the land and compensating the landowner for types of damages occurring as a result of mining operations. To ensure compliance with any reclamation obligations, mine operators are required to post performance bonds. In conjunction with mining the property, our coal lessees are contractually obligated under the terms of our leases to comply with all federal, state and local laws, including SMCRA. Upon completion of the mining, reclamation generally is completed by seeding with grasses or planting trees for use as pasture or timberland, as specified in the reclamation plan approved by the state regulatory authority. In addition, higher and better uses of the reclaimed property are encouraged. Regulatory authorities or individual citizens who bring civil actions under SMCRA may attempt to assign the liabilities of our coal lessees to us if any of these lessees are not financially capable of fulfilling those obligations.

Hazardous Materials and Waste. The Federal Comprehensive Environmental Response, Compensation and Liability Act (CERCLA or the Superfund law) and analogous state laws impose liability, without regard to fault or the legality of the original conduct, on certain classes of persons that are considered to have contributed to the release of a “hazardous substance” into the environment. These persons include the owner or operator of the site where the release occurred, and companies that improperly stored or disposed or arranged for the disposal of the hazardous substances found at the site. Persons who are or were responsible for releases of hazardous substances under CERCLA may be subject to joint and several liability for the costs of cleaning up the hazardous substances that have been released into the environment and for damages to natural resources.

Products such as explosives used by coal companies in operations generate waste containing hazardous substances. We could become liable under federal and state Superfund and waste management statutes if our lessees are unable to pay environmental cleanup costs. CERCLA authorizes the EPA and, in some cases, third parties, to take actions in response to threats to the public health or the environment, and to seek recovery from the responsible classes of persons of the costs they incurred in connection with such response. It is not uncommon for neighboring landowners and other third parties to file claims for personal injury and property damage allegedly caused by hazardous substances or other wastes released into the environment.

Water Discharges. Our lessees’ operations can result in discharges of pollutants into waters. The Clean Water Act and analogous state laws and regulations create two permitting programs for our lessees. The National Pollutant Discharge Elimination System (NPDES) program under Section 402 of the statute is administered by the states or the EPA and regulates the concentrations of pollutants in discharges of waste and storm water from a mine site. The Section 404 program is administered by the Army Corps of Engineers and regulates the placement of the overburden and fill material into channels, streams and wetlands that comprise “waters of the United States.” The scope of waters that may fall within the jurisdictional reach of the Clean Water Act is expansive and may include land features not commonly understood to be a stream or wetlands. The Clean Water Act and its regulations prohibit the unpermitted discharge of pollutants into such waters, including those from a spill or leak. Similarly, Section 404 also prohibits discharges of fill material and certain other activities in waters unless authorized by the issued permit.

Our lessees generally obtain “individual” permits from the Corps of Engineers authorizing the construction of valley fills for the disposal of overburden from mining operations. The application process for acquiring individual permits has become more cumbersome and can require the preparation of an environmental impact statement as part of the application. Small underground coal mines that must construct fills, limited by acreage

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and length, as part of their mining operations may qualify for another version of the Section 404 permit known as “nationwide permit 50.” Both individual and nationwide permits are subject to challenge in citizens’ lawsuits. Such challenges result in delays in our lessees obtaining the required mining permits to conduct their operations, which could, in turn, have an adverse effect on our coal royalty revenues.

Beginning in 2009, the EPA put in place a series of policies for mines in Central Appalachia that have had the effect of slowing the issuance of both Section 404 fill permits by the Corps and Section 402 NPDES permits by state agencies. These policies, among other things, seek to impose limits on a specific conductance (conductivity) and sulfate at levels that can be unachievable absent treatment at many mines. The technologies available to treat conductivity and/or sulfate are expensive and may be impracticable at all but the largest underground mines. These policies are subject to challenge in federal district court in Washington, D.C. in National Mining Association v. Jackson. In two separate opinions, the district court rejected the EPA’s process for reviewing state-issued Section 402 permits and determined that the EPA’s policies constituted unlawful rulemaking for conductivity and fell outside of the EPA’s statutory authority. The EPA has appealed the final July 2012 decision.

Notwithstanding the outcome of this suit, environmental groups have issued “Notices of Intent to Sue (NOIs)” to companies that own coal and other minerals and lease them for mining. The NOI is a notification required by the Clean Water Act before an individual is allowed to file a suit in federal court. A number of land companies, including NRP, have received NOIs. At least one case not involving NRP is now proceeding to trial in the federal court for the Western District of Virginia.

The Clean Water Act also requires states to develop anti-degradation policies to ensure non-impaired water bodies in the state do not fall below applicable water quality standards. These and other regulatory developments may restrict our lessees’ ability to develop new mines, or could require our lessees to modify existing operations, which could have an adverse effect on our coal royalty revenues.

Federal and state surface mining laws require mine operators to post reclamation bonds to guarantee the costs of mine reclamation. West Virginia’s bonding system requires coal companies to post site-specific bonds in an amount up to $5,000 per acre and imposes a per-ton tax on mined coal currently set at $0.279/ton, which is paid to the West Virginia Special Reclamation Fund (SRF). The site-specific bonds are used to reclaim the mining operations of companies that default on their obligations under the West Virginia Surface Coal Mining and Reclamation Act. The SRF is used where the site-specific bonds are insufficient to accomplish reclamation.

Historically, the West Virginia Department of Environmental Protection (WVDEP) did not issue an NPDES permit to itself when it undertook water treatment at abandoned mine sites. This changed following a November 2010 decision of the Court of Appeals for the Fourth Circuit in West Virginia Highlands Conservancy v Huffman. On all such sites, the WVDEP must secure an NPDES permit and treat polluting discharges to meet water quality standards. On August 2, 2011, the West Virginia Highlands Conservancy and other environmental groups filed actions against WVDEP claiming that WVDEP was required to obtain NPDES permits with water quality based effluent limits for 171 bond forfeiture sites not included in the original Fourth Circuit Huffman decision. One action was filed in the Southern District of West Virginia and one in the Northern District. Simultaneously with each action, a Consent Decree executed by the Plaintiffs and WVDEP was filed. The Consent Decrees obligate WVDEP to obtain NPDES permits with water quality based effluent limitations for all sites at issue over the next four years. The decrees also require WVDEP to prepare and submit to the plaintiffs and the Special Reclamation Fund Advisory Committee (SRFAC) a report showing the capital, and operation and maintenance costs anticipated to be incurred in complying with the Consent Decrees. The Consent Decrees were entered by each district court and WVDEP has proceeded to obtain the first group of NPDES permits. In addition, an estimate has been prepared of the additional capital and maintenance costs required for water treatment obligations imposed by the requirement for NPDES permits. As a result of these increased costs, the SRFAC recommended and the West Virginia Legislature enacted an increase in the special reclamation tax from $0.144/ton to $0.279/ton in 2012.

The Federal Safe Drinking Water Act (SDWA) and its state equivalents affect coal mining operations by imposing requirements on the underground injection of fine coal slurries, fly ash and flue gas scrubber sludge,

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and by requiring permits to conduct such underground injection activities. In addition to establishing the underground injection control program, the SDWA also imposes regulatory requirements on owners and operators of “public water systems.” This regulatory program could impact our lessees’ reclamation operations where subsidence or other mining-related problems require the provision of drinking water to affected adjacent homeowners.

Mine Health and Safety Laws. The operations of our lessees are subject to stringent health and safety standards that have been imposed by federal legislation since the adoption of the Mine Health and Safety Act of 1969. The Mine Health and Safety Act of 1969 resulted in increased operating costs and reduced productivity. The Mine Safety and Health Act of 1977, which significantly expanded the enforcement of health and safety standards of the Mine Health and Safety Act of 1969, imposes comprehensive health and safety standards on all mining operations. In addition, the Black Lung Acts require payments of benefits by all businesses conducting current mining operations to coal miners with black lung or pneumoconiosis and to some beneficiaries of miners who have died from this disease.

Mining accidents in recent years have received national attention and instigated responses at the state and national level that have resulted in increased scrutiny of current safety practices and procedures at all mining operations, particularly underground mining operations. Since 2006, heightened scrutiny has been applied to the safe operations of both underground and surface mines. This increased level of review has resulted in an increase in the civil penalties that mine operators have been assessed for non-compliance. Operating companies and their supervisory employees have also been subject to criminal convictions. The Mine Safety and Health Administration (“MSHA”) has also advised mine operators that it will be more aggressive in placing mines in the Pattern of Violations (“POV”) program, if a mine’s rate of injuries or significant and substantial citations exceed a certain threshold. A mine that is placed in a POV program will receive additional scrutiny from MSHA.

Mining Permits and Approvals. Numerous governmental permits or approvals such as those required by SMCRA and the Clean Water Act are required for mining operations. In connection with obtaining these permits and approvals, our lessees may be required to prepare and present to federal, state or local authorities data pertaining to the effect or impact that any proposed production of coal may have upon the environment. The requirements imposed by any of these authorities may be costly and time consuming and may delay commencement or continuation of mining operations.

In order to obtain mining permits and approvals from state regulatory authorities, mine operators, including our lessees, must submit a reclamation plan for reclaiming the mined property, upon the completion of mining operations. Our lessees have obtained or applied for permits to mine a majority of the reserves that are currently planned to be mined over the next five years. Our lessees are also in the planning phase for obtaining permits for the additional reserves planned to be mined over the following five years. However, given the imposition of new requirements in the permits in the form of policies and the increased oversight review that has been exercised by the EPA, there are no assurances that they will not experience difficulty and delays in obtaining mining permits in the future.

Employees and Labor Relations

We do not have any employees. To carry out our operations, affiliates of our general partner employ approximately 78 people who directly support our operations. None of these employees are subject to a collective bargaining agreement.

Segment Information

We conduct all of our operations in a single segment – the ownership and leasing of natural resources and related transportation and processing infrastructure. Substantially all of our owned properties are subject to leases, and revenues are earned based on the volume and price of minerals extracted, processed or transported. Included in revenue from these natural resource properties are royalties from coal, aggregates, oil and gas and timber as well as related transportation and processing infrastructure revenues.

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Website Access to Company Reports

Our internet address is www.nrplp.com. We make available free of charge on or through our internet website our annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934 as soon as reasonably practicable after we electronically file such material with, or furnish it to, the Securities and Exchange Commission. Also included on our website are our “Code of Business Conduct and Ethics,” our “Disclosure Controls and Procedures Policy” and our “Corporate Governance Guidelines” adopted by our Board of Directors and the charters for our Audit Committee, Conflicts Committee and Compensation, Nominating and Governance Committee. Also, copies of our annual report, our Code of Business Conduct and Ethics, our Corporate Governance Guidelines and our committee charters will be made available upon written request.

Item 1A. Risk Factors

Risks Related to Our Business

A substantial or extended decline in coal prices could reduce our coal royalty revenues and the value of our reserves.

The prices our lessees receive for their coal depend upon factors beyond their or our control, including:

• the supply of and demand for domestic and foreign coal;

• domestic and foreign governmental regulations and taxes;

• the price and availability of alternative fuels, especially natural gas;

• the demand for steel;

• the proximity to and capacity of transportation facilities;

• weather conditions; and

• the effect of worldwide energy conservation measures.

Natural gas is the primary fuel that competes with steam coal for power generation. In early 2012, natural gas prices dropped below $2.50/Mcf and, although the prices have rebounded above $3.00/Mcf, a number of utilities have switched generation from steam coal to natural gas to the extent that it is practical to do so. This switching has resulted in a decline in steam coal prices, and to the extent that natural gas prices remain low, steam coal prices will also remain low. In addition, prices for metallurgical coal hit multi-year lows in the second half of 2012 as demand for steel declined significantly. A substantial or extended decline in coal prices could materially and adversely affect us in two ways. First, lower prices may reduce the quantity of coal that may be economically produced from our properties. This, in turn, could reduce our coal royalty revenues and the value of our coal reserves. Second, even if production is not reduced, the royalties we receive on each ton of coal sold may be reduced.

Our lessees’ mining operations are subject to operating risks that could result in lower royalty revenues to us.

The most significant risk faced by our lessees that impacts NRP is permitting. As a result of recent judicial decisions and the increased involvement of the Administration and the EPA in the permitting process, there is substantial uncertainty relating to the ability of our lessees to be issued valley fill permits necessary to conduct mining operations in Central Appalachia. The non-issuance of permits has limited the ability of our lessees to open new operations, expand existing operations, and may preclude new acquisitions in which NRP might otherwise be involved.

Our royalty revenues are largely dependent on our lessees’ level of production from our mineral reserves, and any interruptions to the production of coal from our reserves would reduce our coal royalty revenues. The level of our lessees’ production is subject to operating conditions or events beyond their or our control including:

• the inability to acquire necessary permits or mining or surface rights;

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• changes or variations in geologic conditions, such as the thickness of the mineral deposits and, in the case of coal, the amount of rock embedded in or overlying the coal deposit;

• the price of natural gas, which is a competing fuel in the generation of electricity;

• changes in governmental regulation and enforcement policy related to the coal industry or the electric utility industry;

• mining and processing equipment failures and unexpected maintenance problems;

• interruptions due to transportation delays;

• adverse weather and natural disasters, such as heavy rains and flooding;

• labor-related interruptions; and

• fires and explosions.

Our lessees may also incur costs and liabilities resulting from claims for damages to property or injury to persons arising from their operations. If our lessees are pursued for these sanctions, costs and liabilities, their mining operations and, as a result, our royalty revenues could be adversely affected.

Any decrease in the demand for metallurgical coal could result in lower coal production by our lessees, which would reduce our coal royalty revenues.

Our lessees produce a significant amount of the metallurgical coal that is used in both the U.S. and foreign steel industries. In 2012, approximately 32% of the coal production and 44% of the coal royalty revenues from our properties were from metallurgical coal. Since the amount of steel that is produced is tied to global economic conditions, a decline in those conditions could result in the decline of steel, coke and metallurgical coal production. Since metallurgical coal is priced higher than steam coal, some mines on our properties may only operate profitably if all or a portion of their production is sold as metallurgical coal. If these mines are unable to sell metallurgical coal, they may not be economically viable and may be temporarily idled or closed.

Any change in fuel consumption patterns by electric power generators resulting in a decrease in the use of coal could result in lower coal production by our lessees, which would reduce our coal royalty revenues.

The amount of coal consumed for domestic electric power generation is affected primarily by the overall demand for electricity, the price and availability of competing fuels for power plants and environmental and other governmental regulations. We expect new power plants will be built to produce electricity. Most of these new power plants will be fired by natural gas because of lower construction costs compared to coal-fired plants and because natural gas is a cleaner burning fuel. The increasingly stringent requirements of the federal Clean Air Act has resulted in more electric power generators shifting from coal to natural-gas-fired power plants, or to other alternative energy sources such as solar and wind. The environmental lobby is applying substantial pressure on utilities to limit the construction of new coal-fired generation plants in favor of alternative sources of energy. To the extent that these efforts are successful, it could reduce the demand for our coal.

The adoption of climate change legislation or regulations restricting emissions of “greenhouse gases” could result in reduced demand for our coal.

In December 2009, the EPA determined that emissions of carbon dioxide, methane, and other greenhouse gases, or “GHGs,” present an endangerment to public health and welfare because emissions of such gases are, according to the EPA, contributing to warming of the earth’s atmosphere and other climatic changes. Legal challenges to these findings have been rejected by the D.C. Circuit Court of Appeals, and we cannot predict the outcome of impending petitions to the Supreme Court. Based on its findings, the EPA has begun adopting and implementing regulations to restrict emissions of GHGs under various provisions of the Clean Air Act. Shortly after issuing its findings, EPA adopted rules, effective January 2, 2011, regulating GHG emissions from motor vehicles, and other rules requiring permits for emissions of GHGs from many stationary sources, including coal-fired electric power plants. The EPA has also adopted rules requiring the reporting of GHG emissions from

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specified large GHG emission sources in the United States, including coal-fired electric power plants, on an annual basis, beginning in 2011 for emissions occurring after January 1, 2010, as well as certain oil and natural gas production facilities, on an annual basis, beginning in 2012 for emissions occurring in 2011. As a result of revisions to its preconstruction permitting rules that became fully effective on January 2, 2011, the EPA is now requiring new sources, including coal-fired power plants, to undergo control technology reviews for GHGs (predominately carbon dioxide) as a condition of permit issuance. These reviews may impose limits on GHG emissions, or otherwise be used to compel consideration of alternative fuels and generation systems, as well as increase litigation risk for — and so discourage development of — coal-fired power plants.

In addition, in March 2012, the EPA proposed “new source performance standards” to govern GHG emissions from electric generating units, including those fired by coal. The proposal, if adopted, would in effect prohibit the construction of new coal-fired power plants, because it would require them to meet the same GHG emission rate as a comparably sized gas-fired power plant. The consent decree also represents the EPA’s agreement to consider adopting a GHG limitation program governing existing sources, as well, which the EPA may attempt to use to establish a cap-and-trade-like system on emissions of power plants’ GHG emissions. The EPA continues to delay any such proposal.

Several states have also either passed legislation or announced initiatives focused on decreasing or stabilizing carbon dioxide emissions associated with the combustion of fossil fuels, and many of these measures have focused on emissions from coal-fired electric generating facilities. Other regional programs are being considered in several regions of the country. It is possible that future federal and state initiatives to control carbon dioxide emissions could result in increased costs associated with coal consumption, such as costs to install additional controls to reduce carbon dioxide emissions or costs to purchase emissions reduction credits to comply with future emissions trading programs. Such increased costs for coal consumption could result in some customers switching to alternative sources of fuel, which could negatively impact our lessees’ coal sales, and thereby have an adverse effect on our coal royalty revenues.

In addition to the climate change legislation, our lessees are subject to numerous other federal, state and local laws and regulations that may limit their ability to produce and sell minerals from our properties.

Our lessees may incur substantial costs and liabilities under increasingly strict federal, state and local environmental, health and safety laws, including regulations and governmental enforcement policies. Failure to comply with these laws and regulations may result in the assessment of administrative, civil and criminal penalties, the imposition of cleanup and site restoration costs and liens, the issuance of injunctions to limit or cease operations, the suspension or revocation of permits and other enforcement measures that could have the effect of limiting production from our lessees’ operations.

New environmental legislation, new regulations and new interpretations of existing environmental laws, including regulations governing permitting requirements, could further regulate or tax the mineral industry and may also require our lessees to change their operations significantly, to incur increased costs or to obtain new or different permits, any of which could decrease our royalty revenues. Such increased scrutiny and enforcement of our lessees’ operations may result in increased compliance costs, revisions to permits, or changes in operations, which could decrease our royalty revenues.

As a result of ongoing consolidation in the coal industry and our partnership with Foresight Energy, we derive a greater percentage of our revenues from a smaller number of lessees.

In 2012, we derived 24.4% of our revenues from Foresight Energy and other Cline affiliates and 21.4% from Alpha Natural Resources. Foresight’s Williamson mine alone was responsible for approximately 12.4% of our revenues in 2012. As a result, we have significant concentration of revenues with those lessees, although in most cases, with the exception of Williamson, the exposure is spread out over a number of different mining operations and leases. If our lessees merge or otherwise consolidate, or if we acquire additional reserves from existing lessees, then our revenues could become more dependent on fewer mining companies. If issues occur at those companies that impact their ability to pay us royalties, our royalty revenues and ability to make future distributions would be adversely affected.

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Our business will be adversely affected if we are unable to acquire additional mineral reserves or access the capital markets to finance our growth.

Because our reserves decline as our lessees mine our minerals, our future success and growth depend, in part, upon our ability to acquire additional reserves that are economically recoverable. If we are unable to acquire additional mineral reserves on acceptable terms, our royalty revenues will decline as our reserves are depleted. Our ability to acquire additional mineral reserves or make other acquisitions is dependent in part on our ability to access the capital markets. We cannot be certain that funding will be available if needed and to the extent required, on acceptable terms. If funding is not available when needed, or is available only on unfavorable terms, we may be unable to complete acquisitions or otherwise take advantage of business opportunities or respond to competitive pressures, any of which could have a material adverse effect on our revenues, results of operations and quarterly distributions. In addition, if we are unable to successfully integrate the companies, businesses or properties we are able to acquire, our revenues may decline and we could experience a material adverse effect on our business, financial condition or results of operations.

There is a possibility that any acquisition could be dilutive to our earnings and reduce our ability to make distributions to unitholders. Any debt we incur to finance an acquisition may also reduce our ability to make distributions to unitholders. Our ability to make acquisitions in the future also could be limited by restrictions under our existing or future debt agreements, competition from other mineral companies for attractive properties or the lack of suitable acquisition candidates.

If our lessees do not manage their operations well, their production volumes and our royalty revenues could decrease.

We depend on our lessees to effectively manage their operations on our properties. Our lessees make their own business decisions with respect to their operations within the constraints of their leases, including decisions relating to:

• the payment of minimum royalties;

• marketing of the minerals mined;

• mine plans, including the amount to be mined and the method of mining;

• processing and blending minerals;

• expansion plans and capital expenditures;

• credit risk of their customers;

• permitting;

• insurance and surety bonding;

• acquisition of surface rights and other mineral estates;

• employee wages;

• transportation arrangements;

• compliance with applicable laws, including environmental laws; and

• mine closure and reclamation.

A failure on the part of one of our lessees to make royalty payments, including minimum royalty payments, could give us the right to terminate the lease, repossess the property and enforce payment obligations under the lease. If we repossessed any of our properties, we would seek a replacement lessee. We might not be able to find a replacement lessee and, if we did, we might not be able to enter into a new lease on favorable terms within a reasonable period of time. In addition, the existing lessee could be subject to bankruptcy proceedings that could further delay the execution of a new lease or the assignment of the existing lease to another operator. If we enter into a new lease, the replacement operator might not achieve the same levels of production or sell minerals at the

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same price as the lessee it replaced. In addition, it may be difficult for us to secure new or replacement lessees for small or isolated mineral reserves, since industry trends toward consolidation favor larger-scale, higher-technology mining operations in order to increase productivity.

Our investments in operating businesses expose us to risks that we do not experience in the royalty business.

Our recent acquisition of a general partner interest in the trona operations of OCI Wyoming L.P. subjects us to operational and other contingent liabilities to which we are not exposed through our ownership of mineral rights and royalties. Further, we will not own 100 percent of, and only have limited approval rights with respect to, OCI Wyoming, and our partner will be able to control most business decisions, including decisions with respect to distributions and capital expenditures. In addition, we are ultimately responsible for operating the transportation infrastructure at the Williamson mine, and have assumed the capital and operating risks associated with that business. As a result of these investments, we could experience increased costs as well as increased liability exposure associated with operating these facilities.

Fluctuations in transportation costs and the availability or reliability of transportation could reduce the production of minerals mined from our properties.

Transportation costs represent a significant portion of the total delivered cost for the customers of our lessees. Increases in transportation costs could make coal a less competitive source of energy or could make minerals produced by some or all of our lessees less competitive than coal produced from other sources. On the other hand, significant decreases in transportation costs could result in increased competition for our lessees from producers in other parts of the country.

Our lessees depend upon railroads, barges, trucks and beltlines to deliver minerals to their customers. Disruption of those transportation services due to weather-related problems, mechanical difficulties, strikes, lockouts, bottlenecks and other events could temporarily impair the ability of our lessees to supply minerals to their customers. Our lessees’ transportation providers may face difficulties in the future that may impair the ability of our lessees to supply minerals to their customers, resulting in decreased royalty revenues to us.

Lessees could satisfy obligations to their customers with minerals from properties other than ours, depriving us of the ability to receive amounts in excess of minimum royalty payments.

Mineral supply contracts generally do not require operators to satisfy their obligations to their customers with resources mined from specific reserves. Several factors may influence a lessee’s decision to supply its customers with minerals mined from properties we do not own or lease, including the royalty rates under the lessee’s lease with us, mining conditions, mine operating costs, cost and availability of transportation, and customer specifications. If a lessee satisfies its obligations to its customers with minerals from properties we do not own or lease, production on our properties will decrease, and we will receive lower royalty revenues.

Our reserve estimates depend on many assumptions that may be inaccurate, which could materially adversely affect the quantities and value of our reserves.

Our reserve estimates may vary substantially from the actual amounts of minerals our lessees may be able to economically recover from our reserves. There are numerous uncertainties inherent in estimating quantities of reserves, including many factors beyond our control. Estimates of reserves necessarily depend upon a number of variables and assumptions, any one of which may, if incorrect, result in an estimate that varies considerably from actual results. These factors and assumptions relate to:

• future prices, operating costs, capital expenditures, severance and excise taxes, and development and reclamation costs;

• future mining technology improvements;

• the effects of regulation by governmental agencies; and

• geologic and mining conditions, which may not be fully identified by available exploration data and may differ from our experiences in areas where our lessees currently mine.

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Actual production, revenue and expenditures with respect to our reserves will likely vary from estimates, and these variations may be material. As a result, you should not place undue reliance on our reserve data that is included in this report.

A lessee may incorrectly report royalty revenues, which might not be identified by our lessee audit process or our mine inspection process or, if identified, might be identified in a subsequent period.

We depend on our lessees to correctly report production and royalty revenues on a monthly basis. Our regular lessee audits and mine inspections may not discover any irregularities in these reports or, if we do discover errors, we might not identify them in the reporting period in which they occurred. Any undiscovered reporting errors could result in a loss of royalty revenues and errors identified in subsequent periods could lead to accounting disputes as well as disputes with our lessees.

Risks Inherent in an Investment in Natural Resource Partners L.P.

Cash distributions are not guaranteed and may fluctuate with our performance and the establishment of financial reserves.

Because distributions on the common units are dependent on the amount of cash we generate, distributions may fluctuate based on our performance. The actual amount of cash that is available to be distributed each quarter will depend on numerous factors, some of which are beyond our control and the control of the general partner. Cash distributions are dependent primarily on cash flow, including cash flow from financial reserves and working capital borrowings, and not solely on profitability, which is affected by non-cash items. Therefore, cash distributions might be made during periods when we record losses and might not be made during periods when we record profits.

Cost reimbursements due to our general partner may be substantial and will reduce our cash available for distribution to unitholders.

Prior to making any distribution on the common units, we will reimburse our general partner and its affiliates, including officers and directors of the general partner, for all expenses incurred on our behalf. The reimbursement of expenses and the payment of fees could adversely affect our ability to make distributions. The general partner has sole discretion to determine the amount of these expenses. In addition, our general partner and its affiliates may provide us services for which we will be charged reasonable fees as determined by the general partner.

Unitholders may not be able to remove our general partner even if they wish to do so.

Our general partner manages and operates NRP. Unlike the holders of common stock in a corporation, unitholders have only limited voting rights on matters affecting our business. Unitholders have no right to elect the general partner or the directors of the general partner on an annual or any other basis.

Furthermore, if unitholders are dissatisfied with the performance of our general partner, they currently have little practical ability to remove our general partner or otherwise change its management. Our general partner may not be removed except upon the vote of the holders of at least 66 2/3% of our outstanding units (including units held by our general partner and its affiliates). Because the owners of our general partner, along with directors and executive officers and their affiliates, own a significant percentage of our outstanding common units, the removal of our general partner would be difficult without the consent of both our general partner and its affiliates.

In addition, the following provisions of our partnership agreement may discourage a person or group from attempting to remove our general partner or otherwise change our management:

• generally, if a person acquires 20% or more of any class of units then outstanding other than from our general partner or its affiliates, the units owned by such person cannot be voted on any matter; and

• our partnership agreement contains limitations upon the ability of unitholders to call meetings or to acquire information about our operations, as well as other limitations upon the unitholders’ ability to influence the manner or direction of management.

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As a result of these provisions, the price at which the common units will trade may be lower because of the absence or reduction of a takeover premium in the trading price.

We may issue additional common units without unitholder approval, which would dilute a unitholder’s existing ownership interests.

Our general partner may cause us to issue an unlimited number of common units, without unitholder approval (subject to applicable New York Stock Exchange (NYSE) rules). We may also issue at any time an unlimited number of equity securities ranking junior or senior to the common units without unitholder approval (subject to applicable NYSE rules). The issuance of additional common units or other equity securities of equal or senior rank will have the following effects:

• an existing unitholder’s proportionate ownership interest in NRP will decrease;

• the amount of cash available for distribution on each unit may decrease;

• the relative voting strength of each previously outstanding unit may be diminished; and

• the market price of the common units may decline.

Our general partner has a limited call right that may require unitholders to sell their units at an undesirable time or price.

If at any time our general partner and its affiliates own 80% or more of the common units, the general partner will have the right, but not the obligation, which it may assign to any of its affiliates, to acquire all, but not less than all, of the remaining common units held by unaffiliated persons at a price generally equal to the then current market price of the common units. As a result, unitholders may be required to sell their common units at a time when they may not desire to sell them or at a price that is less than the price they would like to receive. They may also incur a tax liability upon a sale of their common units.

Unitholders may not have limited liability if a court finds that unitholder actions constitute control of our business.

Our general partner generally has unlimited liability for our obligations, such as our debts and environmental liabilities, except for those contractual obligations that are expressly made without recourse to our general partner. Under Delaware law, however, a unitholder could be held liable for our obligations to the same extent as a general partner if a court determined that the right of unitholders to remove our general partner or to take other action under our partnership agreement constituted participation in the “control” of our business. In addition, Section 17-607 of the Delaware Revised Uniform Limited Partnership Act provides that under some circumstances, a unitholder may be liable to us for the amount of a distribution for a period of three years from the date of the distribution.

Conflicts of interest could arise among our general partner and us or the unitholders.

These conflicts may include the following:

• we do not have any employees and we rely solely on employees of affiliates of the general partner;

• under our partnership agreement, we reimburse the general partner for the costs of managing and for operating the partnership;

• the amount of cash expenditures, borrowings and reserves in any quarter may affect cash available to pay quarterly distributions to unitholders;

• the general partner tries to avoid being liable for partnership obligations. The general partner is permitted to protect its assets in this manner by our partnership agreement. Under our partnership agreement the general partner would not breach its fiduciary duty by avoiding liability for partnership obligations even if we can obtain more favorable terms without limiting the general partner’s liability;

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• under our partnership agreement, the general partner may pay its affiliates for any services rendered on terms fair and reasonable to us. The general partner may also enter into additional contracts with any of its affiliates on behalf of us. Agreements or contracts between us and our general partner (and its affiliates) are not necessarily the result of arm’s-length negotiations; and

• the general partner would not breach our partnership agreement by exercising its call rights to purchase limited partnership interests or by assigning its call rights to one of its affiliates or to us.

The control of our general partner may be transferred to a third party without unitholder consent. A change of control may result in defaults under certain of our debt instruments and the triggering of payment obligations under compensation arrangements.

Our general partner may transfer its general partner interest to a third party in a merger or in a sale of all or substantially all of its assets without the consent of our unitholders. Furthermore, there is no restriction in our partnership agreement on the ability of the general partner of our general partner from transferring its general partnership interest in our general partner to a third party. The new owner of our general partner would then be in a position to replace the board of directors and officers with its own choices and to control their decisions and actions.

In addition, a change of control would constitute an event of default under our revolving credit agreement. During the continuance of an event of default under our revolving credit agreement, the administrative agent may terminate any outstanding commitments of the lenders to extend credit to us and/or declare all amounts payable by us immediately due and payable. A change of control also may trigger payment obligations under various compensation arrangements with our officers.

Tax Risks to Common Unitholders

Our tax treatment depends on our status as a partnership for federal income tax purposes as well as our not being subject to a material amount of entity-level taxation by individual states. If the IRS were to treat us as a corporation for federal income tax purposes or we were to become subject to additional amounts of entity-level taxation for state tax purposes, then our cash available for distribution to you would be substantially reduced.

The anticipated after-tax economic benefit of an investment in our common units depends largely on our being treated as a partnership for U.S. federal income tax purposes. Despite the fact that we are organized as a limited partnership under Delaware law, we would be treated as a corporation for U.S. federal income tax purposes unless we satisfy a “qualifying income” requirement. Based on our current operations, we believe we satisfy the qualifying income requirement. However, we have not requested, and do not plan to request, a ruling from the IRS on this or any other matter affecting us. Failing to meet the qualifying income requirement or a change in current law could cause us to be treated as a corporation for U.S. federal income tax purposes or otherwise subject us to taxation as an entity.

If we were treated as a corporation for U.S. federal income tax purposes, we would pay federal income tax on our taxable income at the corporate tax rate, which is currently a maximum of 35%, and would likely be liable for state income tax at varying rates. Distributions to you would generally be taxed again as corporate distributions, and no income, gains, losses or deductions would flow through to you. Because taxes would be imposed upon us as a corporation, our cash available for distribution to you would be substantially reduced. Therefore, our treatment as a corporation would result in a material reduction in the anticipated cash flow and after-tax return to the unitholders, likely causing a substantial reduction in the value of our common units.

At the state level, several states have been evaluating ways to subject partnerships to entity-level taxation through the imposition of state income, franchise and other forms of taxation. Imposition of such a tax on us by any state will reduce the cash available for distribution to you.

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The tax treatment of publicly traded partnerships or an investment in our common units could be subject to potential legislative, judicial or administrative changes or differing interpretations, possibly applied on a retroactive basis.

The present U.S. federal income tax treatment of publicly traded partnerships, including us, or an investment in our common units may be modified by administrative, legislative or judicial changes or differing interpretations at any time. For example, from time to time, members of Congress propose and consider substantive changes to the existing federal income tax laws that affect publicly traded partnerships. One such legislative proposal would eliminate the qualifying income exception to the treatment of all publicly traded partnerships as corporations upon which we rely for our treatment as a partnership for U.S. federal income tax purposes. We are unable to predict whether any of these changes or other proposals will be reintroduced or will ultimately be enacted. Any such changes could negatively impact the value of an investment in our common units. Any modification to U.S. federal income tax laws may be applied retroactively and could make it more difficult or impossible for us to meet the qualifying income requirement to be treated as a partnership for U.S. federal income tax purposes.

If the IRS contests the federal income tax positions we take, the market for our common units may be adversely impacted and the cost of any IRS contest will reduce our cash available for distribution to you.

We have not requested a ruling from the IRS with respect to our treatment as a partnership for federal income tax purposes or any other matter affecting us. The IRS may adopt positions that differ from the positions we take. It may be necessary to resort to administrative or court proceedings to sustain some or all of the positions we take. A court may not agree with some or all of the positions we take. Any contest by the IRS may materially and adversely impact the market for our common units and the price at which they trade. In addition, our costs of any contest by the IRS will be borne indirectly by our unitholders and our general partner because the costs will reduce our cash available for distribution.

You are required to pay taxes on your share of our income even if you do not receive any cash distributions from us.

Because our unitholders are treated as partners to whom we allocate taxable income that could be different in amount than the cash we distribute, you are required to pay any federal income taxes and, in some cases, state and local income taxes on your share of our taxable income even if you receive no cash distributions from us. You may not receive cash distributions from us equal to your share of our taxable income or even equal to the actual tax due from you with respect to that income.

Tax gain or loss on the disposition of our common units could be more or less than expected.

If you sell your common units, you will recognize a gain or loss equal to the difference between the amount realized and your tax basis in those common units. Because distributions in excess of your allocable share of our net taxable income result in a decrease in your tax basis in your common units, the amount, if any, of such prior excess distributions with respect to the common units you sell will, in effect, become taxable income to you if you sell such common units at a price greater than your tax basis in those common units, even if the price you receive is less than your original cost. Furthermore, a substantial portion of the amount realized, whether or not representing gain, may be taxed as ordinary income due to potential recapture items, including depletion and depreciation recapture. In addition, because the amount realized includes a unitholder’s share of our nonrecourse liabilities, if you sell your common units, you may incur a tax liability in excess of the amount of cash you receive from the sale.

Tax-exempt entities and non-U.S. persons face unique tax issues from owning our common units that may result in adverse tax consequences to them.

Investments in common units by tax-exempt entities, such as employee benefit plans and individual retirement accounts (known as IRAs), and non-U.S. persons raise issues unique to them. For example, virtually all of our income allocated to organizations that are exempt from federal income tax, including IRAs and other

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retirement plans, will be unrelated business taxable income and will be taxable to them. Distributions to non-U.S. persons will be reduced by withholding taxes, and non-U.S. persons will be required to file U.S. federal income tax returns and pay tax on their shares of our taxable income. If you are a tax exempt entity or a non-U.S. person, you should consult your tax advisor before investing in our common units.

We will treat each purchaser of common units as having the same tax benefits without regard to the actual common units purchased. The IRS may challenge this treatment, which could adversely affect the value of the common units.

To maintain the uniformity of the economic and tax characteristics of our common units, we have adopted depreciation and amortization positions that may not conform to all aspects of existing Treasury Regulations. A successful IRS challenge to those positions could adversely affect the amount of tax benefits available to you. It also could affect the timing of these tax benefits or the amount of gain from your sale of common units and could have a negative impact on the value of our common units or result in audit adjustments to your tax returns.

We prorate our items of income, gain, loss and deduction between transferors and transferees of our common units each month based upon the ownership of our common on the first day of each month, instead of on the basis of the date a particular unit is transferred. The IRS may challenge this treatment, which could change the allocation of items of income, gain, loss and deduction among our unitholders.

We prorate our items of income, gain, loss and deduction between transferors and transferees of our common units each month based upon the ownership of our common units on the first day of each month, instead of on the basis of the date a particular unit is transferred. The use of this proration method may not be permitted under existing Treasury Regulations. The U.S. Treasury Department has issued proposed Treasury Regulations that provide a safe harbor pursuant to which a publicly traded partnership may use a similar monthly simplifying convention to allocate tax items. Nonetheless, the proposed regulations do not specifically authorize the use of the proration method we have adopted. If the IRS were to challenge our proration method or new Treasury Regulations were issued, we may be required to change the allocation of items of income, gain, loss and deduction among our unitholders.

A unitholder whose common units are the subject of a securities loan (e.g., a loan to a “short seller” to cover a short sale of common units) may be considered as having disposed of those common units. If so, he would no longer be treated for tax purposes as a partner with respect to those common units during the period of the loan and may recognize gain or loss from the disposition.

Because there are no specific rules governing the U.S. federal income tax consequences of loaning a partnership interest, a unitholder whose common units are the subject of a securities loan may be considered as having disposed of the loaned common units. In that case, the unitholder may no longer be treated for tax purposes as a partner with respect to those common units during the period of the loan and the unitholder may recognize gain or loss from such disposition. Moreover, during the period of the loan, any of our income, gain, loss or deduction with respect to those common units may not be reportable by the unitholder and any cash distributions received by the unitholder as to those common units could be fully taxable as ordinary income. Unitholders desiring to assure their status as partners and avoid the risk of gain recognition from a loan of their common units are urged to modify any applicable brokerage account agreements to prohibit their brokers from borrowing their common units.

The sale or exchange of 50% or more of our capital and profits interests during any twelve-month period will result in the termination of us as a partnership for federal income tax purposes.

We will be considered to have terminated as a partnership for federal income tax purposes if there is a sale or exchange of 50% or more of the total interests in our capital and profits within a twelve-month period. For purposes of determining whether the 50% threshold has been met, multiple sales of the same interest will be counted only once. Our termination would, among other things, result in the closing of our taxable year for all unitholders, which would result in our filing two tax returns for one calendar year and could result in a significant deferral of depreciation deductions allowable in computing our taxable income. In the case of a unitholder

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reporting on a taxable year other than a calendar year, the closing of our taxable year may also result in more than twelve months of our taxable income or loss being includable in taxable income for the unitholder’s taxable year that includes our termination. Our termination would not affect our classification as a partnership for federal income tax purposes, but it would result in our being treated as a new partnership for U.S. federal income tax purposes following the termination. If we were treated as a new partnership, we would be required to make new tax elections and could be subject to penalties if we were unable to determine that a termination occurred. The IRS recently announced a relief procedure whereby if a publicly traded partnership that has technically terminated requests and the IRS grants special relief, among other things, the partnership may be permitted to provide only a single Schedule K-1 to unitholders for the two short tax periods included in the year in which the termination occurs.

Certain federal income tax preferences currently available with respect to coal exploration and development may be eliminated as a result of future legislation.

Changes to U.S. federal income tax laws have been proposed in a prior session of Congress that would eliminate certain key U.S. federal income tax preferences relating to coal exploration and development. These changes include, but are not limited to (i) repealing capital gains treatment of coal and lignite royalties, (ii) eliminating current deductions and 60-month amortization for exploration and development costs relating to coal and other hard mineral fossil fuels, (iii) repealing the percentage depletion allowance with respect to coal properties, and (iv) excluding from the definition of domestic production gross receipts all gross receipts derived from the sale, exchange, or other disposition of coal, other hard mineral fossil fuels, or primary products thereof. If enacted, these changes would limit or eliminate certain tax deductions that are currently available with respect to coal exploration and development, and any such change could increase the taxable income allocable to our unitholders and negatively impact the value of an investment in our common units.

As a result of investing in our common units, you are subject to state and local taxes and return filing requirements in jurisdictions where we operate or own or acquire property.

In addition to federal income taxes, you are likely subject to other taxes, including state and local taxes, unincorporated business taxes and estate, inheritance or intangible taxes that are imposed by the various jurisdictions in which we conduct business or own property now or in the future, even if you do not live in any of those jurisdictions. You are likely required to file state and local income tax returns and pay state and local income taxes in some or all of these various jurisdictions. Further, you may be subject to penalties for failure to comply with those requirements. We own property and conduct business in a number of states in the United States. Most of these states impose an income tax on individuals, corporations and other entities. As we make acquisitions or expand our business, we may own assets or conduct business in additional states that impose a personal income tax. It is your responsibility to file all United States federal, state and local tax returns.

Item 1B. Unresolved Staff Comments

None.

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Item 2. Properties

Major Coal Properties

The following is a summary of our major coal producing properties in each region.For information regarding our Coal Reserves and Production as well as other information related to our coal properties, please see “Item 1. Business.”

Northern Appalachia

Hibbs Run.    The Hibbs Run Property is located in Marion County, West Virginia. In 2012, 3.8 tons were produced from the property. We lease this property to subsidiaries of Consol Energy. Coal from this property is produced from longwall mines. The royalty rate for this property is a low fixed rate per ton and has a significant effect on the per ton revenue for the region.

AFG-Ohio.     The AFG-Ohio property is located in Belmont County, Ohio. In 2012, 3.1 million tons were produced from the property. We lease this property to subsidiaries of Murray Energy Corporation. Coal is produced from an underground longwall mine.

Beaver Creek.     The Beaver Creek property is located in Grant and Tucker Counties, West Virginia. In 2012, 2.3 million tons were produced from this property. We lease this property to Mettiki Coal, LLC, a subsidiary of Alliance Resource Partners L.P. Coal is produced from an underground longwall mine. It is transported by truck to a preparation plant operated by the lessee. Coal is shipped primarily by truck to the Mount Storm power plant of Dominion Power.

Area F.    The Area F property is located in Randolph and Upshur Counties, West Virginia. In 2012, 199,000 tons were produced from the property. We lease this property to Carter Roag, a subsidiary of Metinvest. Coal from this property is produced from an underground mine. The raw coal is trucked to a preparation plant operated by the lessee. Coal is shipped via rail and exported for use by Metinvest.

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The map below shows the location of our properties in Northern Appalachia.

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Central Appalachia

VICC/Alpha.    The VICC/Alpha property is located in Wise, Dickenson, Russell and Buchanan Counties, Virginia. In 2012, 5.0 million tons were produced from this property. We primarily lease this property to a subsidiary of Alpha Natural Resources. Production comes from both underground and surface mines and is trucked to one of four preparation plants. Coal is shipped via both the CSX and Norfolk Southern railroads to utility and metallurgical customers. Major customers include American Electric Power, Southern Company, Tennessee Valley Authority, VEPCO and U.S. Steel and to various export metallurgical customers.

Lynch.    The Lynch property is located in Harlan and Letcher Counties, Kentucky. In 2012, 3.1 million tons were produced from this property. We primarily lease the property to a subsidiary of Alpha Natural Resources. Production comes from both underground and surface mines. Coal is transported by truck to a preparation plant on the property and is shipped primarily on the CSX railroad to utility customers such as Georgia Power and Orlando Utilities. The lessee also has the ability to ship coal on the Norfolk Southern railroad and this coal goes to utility customers and domestic and export metallurgical customers. During the second half of 2012, the lessee idled some mines on this property that served the steam market.

Dingess-Rum.    The Dingess-Rum property is located in Logan, Clay and Nicholas Counties, West Virginia. This property is leased to subsidiaries of Alpha Natural Resources and Patriot Coal. In 2012, 3.1 million tons were produced from the property. Both steam and metallurgical coal are produced from underground and surface mines and has been historically transported by belt or truck to preparation plants on the property. Coal is shipped via the CSX railroad to steam customers such as American Electric Power, Dayton Power and Light, Detroit Edison and to various export metallurgical customers.

VICC/Kentucky Land.    The VICC/Kentucky Land property is located primarily in Perry, Leslie and Pike Counties, Kentucky. In 2012, 2.3 million tons were produced from this property. Coal is produced from a number of lessees from both underground and surface mines. Coal is shipped primarily by truck but also on the CSX and Norfolk Southern railroads to customers such as Southern Company, Tennessee Valley Authority, and American Electric Power.

Lone Mountain.    The Lone Mountain property is located in Harlan County, Kentucky. In 2012, 1.7 million tons were produced from this property. We lease the property to a subsidiary of Arch Coal, Inc. Production comes from underground mines and is transported primarily by beltline to a preparation plant on adjacent property and shipped on the Norfolk Southern or CSX railroads to utility customers such as Georgia Power and the Tennessee Valley Authority.

D.D. Shepard.    The D.D. Shepard property is located in Boone County, West Virginia. This property is primarily leased to a subsidiary of Patriot Coal Corp. In 2012, 1.6 million tons were produced from the property. Both steam and metallurgical coal are produced by the lessees from underground and surface mines. Coal is transported from the mines via belt or truck to preparation plants on the property. Coal is shipped via the CSX railroad to various domestic and export metallurgical customers.

Pardee.    The Pardee property is located in Letcher County, Kentucky and Wise County, Virginia. In 2012, 1.3 million tons were produced from this property. We lease the property to a subsidiary of Arch Coal, Inc. Production comes from underground and surface mines and is transported by truck or beltline to a preparation plant on the property and shipped primarily on the Norfolk Southern railroad to utility customers such as Georgia Power and the Tennessee Valley Authority and domestic and export metallurgical customers such as Algoma Steel and Arcelor.

Kingston.    The Kingston property is located in Fayette and Raleigh Counties, West Virginia. This property is leased to a subsidiary of Alpha Natural Resources. In 2012, 1.3 million tons were produced from the property. Both steam and metallurgical coal are produced from underground and surface mines and has been historically transported by belt or truck to a preparation plant on the property or shipped raw. Coal is shipped via both the CSX railroad and by truck to barges to steam customers and various export metallurgical customers.

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The map below shows the location of our properties in Central Appalachia.

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Southern Appalachia

Oak Grove.    The Oak Grove property is located in Jefferson County, Alabama. In 2012, 2.0 million tons were produced from this property. We lease the property to a subsidiary of Cliffs Natural Resources, Inc. Production comes from an underground mine and is transported primarily by beltline to a preparation plant. The metallurgical coal is then shipped via railroad and barge to both domestic and export customers.

BLC Properties.    The BLC properties are located in Kentucky and Tennessee. In 2012, 1.7 million tons were produced from these properties. We lease these properties to a number of operators including Appolo Fuels Inc., Bell County Coal Corporation and Kopper-Glo Fuels. Production comes from both underground and surface mines and is trucked to preparation plants and loading facilities operated by our lessees. Coal is transported by truck and is shipped via both CSX and Norfolk Southern railroads to utility and industrial customers. Major customers include Southern Company, South Carolina Electric & Gas, and numerous medium and small industrial customers.

The map below shows the location of our properties in Southern Appalachia.

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IllinoisBasin

Williamson.    The Williamson property is located in Franklin and Williamson Counties, Illinois. The property is under lease to an affiliate of Foresight Energy, and in 2012, 7.3 million tons were mined on the property. This production is from a longwall mine. Production is shipped primarily via the Canadian National railroad to customers such as Duke and to various export customers.

Hillsboro.    The Hillsboro property is located in Montgomery and Bond Counties, Illinois. The property is under lease to an affiliate of Foresight Energy, and in 2012, 1.8 million tons were shipped from the property. Production is currently from an underground longwall mine and is shipped via either the Union Pacific, Norfolk Southern or Canadian National railroads or by barges to domestic utilities or export customers.

Macoupin.    The Macoupin property is located in Macoupin County, Illinois. The property is under lease to an affiliate of Foresight Energy, and in 2012, 1.8 million tons were shipped from the property. Production is from an underground mine and is shipped via the Norfolk Southern or Union Pacific railroads or by barge to customers such as Western KY Energy and other midwest utilities or loaded into barges for shipment to export customers.

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The map below shows the location of our properties in the Illinois Basin.

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Northern Powder River Basin

Western Energy.    The Western Energy property is located in Rosebud and Treasure Counties, Montana. In 2012, 2.4 million tons were produced from our property. A subsidiary of Westmoreland Coal Company has two coal leases on the property. Coal is produced by surface dragline mining, and the coal is transported by either truck or beltline to the four-unit 2,200-megawatt Colstrip generation station located at the mine mouth and by the Burlington Northern Santa Fe railroad to Minnesota Power. A small amount of coal is transported by truck to other customers.

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The map below shows the location of our properties in the Northern Powder River Basin.

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BRP Properties

BRP is a venture between NRP and International Paper Company, of which NRP owns a 51% interest. As of December 31, 2012, BRP had acquired, in several stages from International Paper, approximately 9.1 million mineral acres in 31 states. While the vast majority of the 9.1 million acres remain largely undeveloped and underexplored, BRP currently holds 59 revenue generating mineral leases and 17 cell tower leases. In addition, a significant number of mineral prospects and deposits with yet undetermined commercial potential have been identified through a variety of efforts including exploration drilling, coring, drill logs, electric logs, inferences derived from published information, geological reports, geological maps, in-house efforts and consulting investigations. These prospects and deposits are not necessarily near-term commercial opportunities due to a variety of factors such as location, market, economic and production uncertainties, but have long-term development potential.

BRP’s assets include approximately 300,000 gross acres of oil and gas mineral rights in Louisiana, of which over 54,000 acres were leased under 41 leases as of December 31, 2012. In addition to the leased mineral acreage, BRP holds a 1% gross production royalty interest on approximately 22,000 mineral acres in Louisiana. The remaining oil and gas mineral acreage in Louisiana is not leased but a number of acres are in areas with development potential. BRP has over 500 acres leased in Pennsylvania and approximately 300 acres leased in Texas.

As of December 31, 2012, BRP owned nearly 95,000 net mineral acres of coal rights (primarily lignite) in the Gulf Coast region, of which approximately 5,000 acres are leased under four separate leases in Louisiana and Alabama. In addition to the coal rights, BRP has aggregate reserves (including limestone, granite, clay, and sand and gravel) under lease in six states.

BRP also owns copper rights in Michigan’s Upper Peninsula that are subject to a development agreement with Highland Copper Company Inc. By the end of 2012, Highland had drilled approximately 175 core holes representing approximately 80,000 total feet that have been cored, sampled and analyzed for copper. Highland expects to complete a feasibility study on the reserves in 2013.

Other mineral rights held by BRP as of December 31, 2012 included coalbed methane rights in four Gulf Coast states, metal prospect rights in four states, approximately 450,000 acres of water and water royalty rights in East Texas, geothermal rights and geothermal royalty interests in the Gulf Coast and Pacific Northwest, and carbon sequestration rights primarily in the Gulf Coast region.

The map on the following page illustrates the location of BRP’s current mineral rights.

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Title to Property

We owned approximately 99% of our coal, aggregates and oil and gas reserves in fee as of December 31, 2012. We lease the remainder from unaffiliated third parties. We believe that we have satisfactory title to all of our mineral properties, but we have not had a qualified title company confirm this belief. Although title to these properties is subject to encumbrances in certain cases, such as customary easements, rights-of-way, interests generally retained in connection with the acquisition of real property, licenses, prior reservations, leases, liens, restrictions and other encumbrances, we believe that none of these burdens will materially detract from the value of our properties or from our interest in them or will materially interfere with their use in the operations of our business.

For most of our properties, the surface, oil and gas and mineral or coal estates are owned by different entities. Some of those entities are our affiliates. State law and regulations in most of the states where we do business require the oil and gas owner to coordinate the location of wells so as to minimize the impact on the intervening coal seams. We do not anticipate that the existence of the severed estates will materially impede development of the minerals on our properties.

Item 3. Legal Proceedings

We are involved, from time to time, in various legal proceedings arising in the ordinary course of business. While the ultimate results of these proceedings cannot be predicted with certainty, we believe these claims will not have a material effect on our financial position, liquidity or operations.

Item 4. Mine Safety Disclosures

Not applicable.

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PART II

Item 5. Market for Registrant’s Common Units, Related Unitholder Matters and Issuer Purchases of Equity Securities

Our common units are listed and traded on the NYSE under the symbol “NRP”. As of February 14, 2013, there were approximately 43,000 beneficial and registered holders of our common units. The computation of the approximate number of unitholders is based upon a broker survey.

The following table sets forth the high and low sales prices per common unit, as reported on the NYSE Composite Transaction Tape from January 3, 2011 to December 31, 2012, and the quarterly cash distribution declared and paid with respect to each quarter per common unit.

	Price Range				Cash Distribution History
	High		Low		Per Unit		Record Date		Payment Date
2011
First Quarter	$	37.80	$	32.24	$	0.5400		05/05/2011		05/13/2011
Second Quarter	$	35.44	$	29.26	$	0.5400		08/05/2011		08/12/2011
Third Quarter	$	35.03	$	23.98	$	0.5500		11/04/2011		11/14/2011
Fourth Quarter	$	30.48	$	23.36	$	0.5500		02/03/2012		02/14/2012
2012
First Quarter	$	28.70	$	23.36	$	0.5500		05/04/2012		05/14/2012
Second Quarter	$	25.08	$	21.45	$	0.5500		08/03/2012		08/14/2012
Third Quarter	$	23.04	$	18.67	$	0.5500		11/05/2012		11/14/2012
Fourth Quarter	$	22.50	$	16.90	$	0.5500		02/05/2013		02/14/2013

Cash Distributions to Partners

(In thousands)

	General Partner		Limited Partners		Total Distributions
2011
Distributions	$	4,696	$	230,080	$	234,776
2012
Distributions	$	4,758	$	233,263	$	238,021

We must distribute all of our cash on hand at the end of each quarter, less cash reserves established by our general partner. We refer to this cash as “available cash” as that term is defined in our partnership agreement. The amount of available cash may be greater than or less than the quarterly distribution. Provisions of our credit facility and note purchase agreement may restrict our ability to make distributions under certain limited circumstances. Please see Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations- Contractual Obligations and Commercial Commitments.”

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Item 6. Selected Financial Data

The following table shows selected historical financial data for Natural Resource Partners L.P. for the periods and as of the dates indicated. We derived the information in the following tables from, and the information should be read together with and is qualified in its entirety by reference to, the historical financial statements and the accompanying notes included in Item 8, “Financial Statements and Supplementary Data” in this and previously filed Forms 10-K. These tables should be read together with Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

NATURAL RESOURCE PARTNERS L.P.

(In thousands, except per unit and per ton data)

	For the Years Ended December 31,
	2012		2011		2010		2009		2008
Total revenues	$	379,147	$	377,683	$	301,401	$	256,084	$	291,665
Asset impairments	$	2,568	$	161,336	$	—	$	—	$	—
Income from operations	$	267,165	$	104,135	$	196,061	$	153,975	$	197,007
Net income	$	213,355	$	54,026	$	154,461	$	114,080	$	170,006
Basic and diluted net income per limited partner unit	$	1.97	$	0.50	$	1.54	$	1.17	$	1.95
Distributions paid ($ per unit)	$	2.20	$	2.17	$	2.16	$	2.16	$	2.02
Weighted average number of common units outstanding		106,028		106,028		81,917		67,702		64,891
Cash from operations	$	271,408	$	305,574	$	258,694	$	210,669	$	229,956
Balance sheet data:
Cash and cash equivalents	$	149,424	$	214,922	$	95,506	$	82,634	$	89,928
Total assets	$	1,764,672	$	1,665,649	$	1,664,036	$	1,523,590	$	1,301,340
Long-term debt	$	897,039	$	836,268	$	661,070	$	626,587	$	478,822
Partners’ capital	$	617,447	$	644,915	$	825,180	$	765,226	$	743,341

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion of the financial condition and results of operations should be read in conjunction with the historical financial statements and notes thereto included elsewhere in this filing. For more detailed information regarding the basis of presentation for the following financial information, see the Notes to the Consolidated Financial Statements.

Executive Overview

Our Business

We engage principally in the business of owning, managing and leasing mineral properties in the United States. We own coal reserves in the three major U.S. coal-producing regions: Appalachia, the Illinois Basin and the Western United States, as well as lignite reserves in the Gulf Coast region. As of December 31, 2012, we owned or controlled approximately 2.4 billion tons of proven and probable coal reserves, and we also owned approximately 500 million tons of aggregate reserves in a number of states across the country. We do not operate any mines, but lease our reserves to experienced mine operators under long-term leases that grant the operators the right to mine and sell our reserves in exchange for royalty payments.

Our revenue and profitability are dependent on our lessees’ ability to mine and market our reserves. Most of our coal is produced by large companies, many of which are publicly traded, with experienced and professional sales departments. A significant portion of our coal is sold by our lessees under coal supply contracts that have terms of one year or more. In contrast, our aggregate properties are typically mined by regional operators with significant experience and knowledge of the local markets. The aggregates are sold at current market prices, which historically have increased along with the producer price index for sand and gravel. Over the long term, both our coal and aggregate royalty revenues are affected by changes in the market for and the market price of the commodities.

In our coal and aggregate royalty business, our lessees generally make payments to us based on the greater of a percentage of the gross sales price or a fixed royalty per ton of coal or aggregates they sell, subject to minimum monthly, quarterly or annual payments. These minimum royalties are generally recoupable over a specified period of time, which varies by lease, if sufficient royalties are generated from production in those future periods. We do not recognize these minimum royalties as revenue until the applicable recoupment period has expired or they are recouped through production. Until recognized as revenue, these minimum royalties are recorded as deferred revenue, a liability on our balance sheet.

During 2012, we generated $111.8 million of our revenues from sources other than coal and aggregate royalty revenues, compared to $91.7 million for 2011. The majority of the increase was due to a $14.8 million increase in minimums recognized as revenue resulting from the expiration of the recoupment period on certain leases. We also recognized $13.6 million from the sale of assets, including $8.5 million from the sale of a right of way for highway construction and $4.7 million from the sale of a preparation plant.

In addition to the minimums recognized as revenue and gains on sales of assets, other sources of revenue include: processing and transportation fees; oil and gas royalty revenue; overriding royalties; wheelage payments; rentals; property tax revenue; and timber sales. The processing and transportation fees and overriding royalties were primarily derived from the coal-related assets.

Our Current Liquidity Position

Our credit facility does not mature until August 2016 and, as of December 31, 2012, we had $152 million in available capacity under the facility. In addition to the amounts available under our credit facility, we had approximately $149.4 million in cash at December 31, 2012. In January 2013, we acquired the interests in OCI Wyoming described in “Note 16. Subsequent Events.” to our financial statements. In connection with that acquisition, we entered into a three-year, $200 million term loan. We also used $16 million of cash on hand to acquire the interests. After the closing of the acquisition, we had still had $152 million in available capacity under our credit facility. We believe that the combination of the capacity under our credit facility and our cash on hand gives us enough liquidity to meet our current financial needs.

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We hold a $35 million senior note that matures in June 2013 that we intend to refinance at or prior to its maturity. In addition, because the annual principal payments on our other senior notes will increase significantly beginning in 2013, we may choose to refinance some or all of the principal payments as they come due. We typically access the capital markets to refinance amounts outstanding under our credit facility as we approach the limits under that facility, the timing of which depends on the pace and size of our acquisition program.

Current Results/Market Outlook

For the year ended December 31, 2012, our lessees produced 59.7 million tons of coal and aggregates, generating $267.3 million in royalty revenues from our properties, and our total revenues were $379.1 million. We continue to have substantial exposure to metallurgical coal, from which we derived approximately 44% of our coal royalty revenues and 32% of the related production. While the demand for domestic steel was strong over the first half of the year, it began to decline in the third quarter, and prices for metallurgical coal dropped significantly in the fourth quarter and remain low heading into 2013. Primarily as a result of lower metallurgical prices and demand, but also due to the continued weakness in the steam coal market, our coal royalty revenues from Central Appalachia declined materially in 2012 as compared to 2011. However, over the full year, we saw the benefits of the diversity of our assets, with significant improvements in coal royalty revenues from our Illinois and Southern Appalachia properties as well as other sources of revenues offsetting much of the decline in Central Appalachia.

The market for steam coal remained soft as expected in 2012, with extremely low natural gas prices resulting in significant displacement of coal by gas for domestic power production. Further, the federal government regulations dealing with air quality at power plants have led to the announcement of planned closures of a number of coal-fired power plants, which will have an impact on future demand. In response to these events, a number of coal companies reduced their production over the course of the year, which has resulted in lower production from our properties.

Looking ahead to 2013, the production cutbacks by a number of our lessees, coupled with the continued soft demand for both steam and metallurgical coal, will likely result in lower coal royalty revenues for NRP. However, the reduced coal royalty revenues will be offset in part by revenues from our newly acquired interest in OCI Wyoming’s soda ash operations.

Growth Through Acquisitions

In 2012, we spent approximately $240 million to acquire additional assets that will help secure the future growth of the partnership. Included in these acquisitions were additional steam coal reserves and transportation infrastructure in Illinois, metallurgical coal reserves in Virginia, oil and gas mineral rights in Oklahoma, an overriding royalty on oil and gas reserves in the liquids-rich portion of the Marcellus Shale play, and an overriding royalty on frac sand reserves in Wisconsin. These efforts are reflective of NRP management’s desire to continue to grow and diversify the assets of the partnership and attempt to ensure the stability of future revenues and distributions to our unitholders.

Political, Legal and Regulatory Environment

The political, legal and regulatory environment continues to be difficult for the coal industry. The Environmental Protection Agency, or EPA, has used its authority to create significant delays in the issuance of new permits and the modification of existing permits, which has led to substantial delays and increased costs for coal operators. In addition to its involvement in the permitting process, in December 2009, the EPA determined that six greenhouse gases, including carbon dioxide and methane, endanger the public health and welfare of current and future generations. In Coalition for Responsible Regulation v. EPA, several petitioners challenged the EPA’s findings, but in June 2012 the D.C. Circuit Court upheld all of the regulations promulgated by the EPA. The petitioners have appealed the ruling and have requested to have several issues in the case heard en banc, but the ruling was a significant victory for the EPA.

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Over the past year, the industry has successfully challenged EPA policy, regulations and guidance in several other court decisions, including Mingo Logan Coal Co. v. EPA, National Mining Association v. Jackson, and EME Homer City Generation, L.P. v. EPA. While each of these cases has unique facts and circumstances, the general theme in these cases is that the EPA has overreached its authority in a number of instances. However, the EPA has continued to promulgate regulations that will negatively affect the viability of coal-fired generation, which will ultimately reduce coal consumption and the production of coal from our properties. Additionally, citizens’ groups have continued to be active in bringing lawsuits against operators, as well as challenging permits issued by the Army Corps of Engineers.

In addition to the increased oversight of the EPA, the Mine Safety and Health Administration, or MSHA, has increased its involvement in the approval of plans and enforcement of safety issues in connection with mining. MSHA’s involvement has increased the cost of mining due to more frequent citations and much higher fines imposed on our lessees as well as the overall cost of regulatory compliance. Combined with the difficult economic environment and the higher costs of mining in general, MSHA’s recent increased participation in the mine development process has reduced production from mines, caused some mines to be idled and has delayed the opening of new mines.

Distributable Cash Flow

Under our partnership agreement, we are required to distribute all of our available cash each quarter. Because distributable cash flow is a significant liquidity metric that is an indicator of our ability to generate cash flows at a level that can sustain or support an increase in quarterly cash distributions paid to our partners, we view it as the most important measure of our success as a company. Distributable cash flow is also the quantitative standard used in the investment community with respect to publicly traded partnerships.

Our historical distributable cash flow represents cash flow from operations, proceeds from sale of assets and return on direct financing lease and contractual override less actual principal payments and cash reserves set aside for scheduled principal payments on our senior notes. Although distributable cash flow is a “non-GAAP financial measure,” we believe it is a useful adjunct to net cash provided by operating activities under GAAP. Distributable cash flow is not a measure of financial performance under GAAP and should not be considered as an alternative to cash flows from operating, investing or financing activities. Distributable cash flow may not be calculated the same for NRP as for other companies. A reconciliation of distributable cash flow to net cash provided by operating activities is set forth below.

We have historically reduced our distributable cash flow by the amount of cash we have reserved for principal payments due on our senior notes in the next calendar year. However, to present our distributable cash flow more in line with MLP practice and because we intend to refinance some or all of the principal payments that are due in 2013 and 2014, we are no longer going to reduce distributable cash flow by reserves for future principal payments. This change in our reporting of distributable cash flow does not change our long-term intention to pay down our debt.

Reconciliation of GAAP “Net cash provided by operating activities”

to Non-GAAP “Distributable cash flow”

	For the Years Ended December 31,
	2012			2011			2010
Net cash provided by operating activities	$	271,408		$	305,574		$	258,694
Less scheduled principal payments		(30,800	)		(31,518	)		(32,234	)
Less reserves for future principal payments		(52,234	)		(31,159	)		(31,699	)
Add reserves used for scheduled principal payments		30,800			31,518			32,234
Return on direct financing lease		2,669			—			—
Proceeds from sale of assets		24,822			5,600			1,180
Distributable cash flow	$	246,665		$	280,015		$	228,175

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Recent Acquisitions

We are a growth-oriented company and have closed a number of acquisitions over the last several years. Our most recent acquisitions are briefly described below.

OCI. On January 24, 2013, we acquired non-controlling equity interests in OCI Wyoming Co. and OCI Wyoming, L.P. The interests are comprised of a 48.51% general partner interest in OCI LP and 20% of the common stock and 100% of the preferred stock in OCI Co. OCI Co owns a 1% limited partnership interest in OCI LP and has the right to receive a $14.5 million annual priority distribution before distributions are paid to other interests. The 80% common interest in OCI Co is owned by OCI Chemical Corporation and the 50.49% interest in OCI LP is owned by OCI Wyoming Holding Co., a subsidiary of OCI Chemical Corporation.

The three investments were acquired from Anadarko Holding Company and its subsidiary, Big Island Trona Company for $292.5 million. The purchase price was funded from the proceeds of a $200 million term loan, $76.5 million in equity and GP interests issued in a private placement and the balance from operating cash. The acquisition agreement provides for up to $50 million in additional contingent consideration should certain performance criteria be met as defined in the purchase and sales agreement in any of 2013, 2014 or 2015.

Marcellus Override.    In December 2012, we acquired an overriding royalty interest on approximately 88,000 net acres of overriding royalty interests in oil and gas reserves located in the Marcellus Shale for $30.3 million.

Hi-Crush Override.    On October 30, 2012, we acquired an overriding royalty interest in frac sand reserves located on approximately 561 acres near Wyeville, Wisconsin for approximately $15.0 million.

Colt. Between September 2009 and September 2012, we acquired approximately 200 million tons of coal reserves related to the Deer Run Mine in Illinois from Colt, LLC, an affiliate of the Cline Group, for a total purchase price of $255 million.

Oklahoma Oil and Gas.    From December 2011 through June 2012, we acquired approximately 19,200 net mineral acres located in the Mississippian Lime oil play in Northern Oklahoma for $63.9 million.

Sugar Camp.    In March 2012, we acquired the rail loadout associated infrastructure assets for $50.0 million and a contractual overriding royalty for $8.9 million interest on certain tonnage at the Sugar Camp mine in Illinois. The rail loadout and infrastructure assets were purchased from Sugar Camp Energy, LLC and the contractual overriding royalty interest was purchased from Ruger, LLC, both affiliates of the Cline Group.

Litz-Moore.    In March 2012, we acquired metallurgical coal reserves adjacent to current NRP holdings in Virginia for $2.8 million.

Royal. In July 2011, we acquired approximately 44,000 acres of coal reserves and coal bed methane located in Pennsylvania and Illinois from Royal Oil and Gas Corporation for $8.0 million.

NBR Sand.    In June 2011, we acquired an overriding royalty interest in approximately 711 acres of frac sand reserves near Tyler, Texas for $16.5 million.

East Tennessee Materials.    In March 2011, we acquired approximately 500 acres of mineral and surface rights related to limestone reserves in Cleveland, Tennessee near Chattanooga for $4.7 million.

CALX Resources.    In February 2011, we acquired approximately 500 acres of mineral and surface rights related to limestone reserves on the Tennessee River near Paducah, Kentucky for $16.0 million.

Critical Accounting Policies

Coal and Aggregate Royalties.    Coal and aggregate royalty revenues are recognized on the basis of tons of mineral sold by our lessees and the corresponding revenue from those sales. Generally, the lessees make payments to us based on the greater of a percentage of the gross sales price or a fixed price per ton of mineral they sell, subject to minimum annual or quarterly payments.

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Processing and Transportation Fees.    Processing fees are recognized on the basis of tons of material processed through the facilities by our lessees and the corresponding revenue from those sales. Generally, the lessees of the processing facilities make payments to us based on the greater of a percentage of the gross sales price or a fixed price per ton of coal that is processed and sold from the facilities. The processing leases are structured so that the lessees are responsible for operating and maintenance expenses associated with the facilities. Transportation fees are recognized on the basis of tons of coal transported over the beltlines. Under the terms of the transportation contracts, we receive a fixed price per ton for all coal transported on the beltlines.

Oil and Gas Royalties.    Oil and gas royalties are recognized on the basis of volume of hydrocarbons sold by lessees and the corresponding revenue from those sales. Generally, the lessees make payments based on a percentage of the selling price. Some leases are subject to minimum annual payments or delay rentals.

Minimum Royalties.    Most of our lessees must make minimum annual or quarterly payments which are generally recoupable over certain time periods. These minimum payments are recorded as deferred revenue when received. The deferred revenue attributable to the minimum payment is recognized as revenues either when the lessee recoups the minimum payment through production or immediately following the period during which the lessee is allowed to recoup the minimum payment.

Lessee Audits and Inspections.    We periodically audit lessee information by examining certain records and internal reports of our lessees. Our regional managers also perform periodic mine inspections to verify that the information that has been submitted to us is accurate. Our audit and inspection processes are designed to identify material variances from lease terms as well as differences between the information reported to us and the actual results from each property. Our audits and inspections, however, are in periods subsequent to when the revenue is reported and any adjustment identified by these processes might be in a reporting period different from when the revenue was initially recorded.

Depreciation, Depletion and Amortization.    We depreciate our plant and equipment on a straight line basis over the estimated useful life of the asset. We deplete mineral properties on a units-of-production basis by lease, based upon minerals mined in relation to the net cost of the mineral properties and estimated proven and probable tonnage in those properties. We amortize intangible assets on a units-of-production basis, unless classified as a temporarily idled asset then a minimum amortization is applied. Oil and gas mineral rights are depleted over the units of production. We estimate proven and probable reserves with the assistance of third-party consultants, as well as estimation techniques and recoverability assumptions. We update our estimates of reserves periodically and this may result in material adjustments to reserves and depletion rates that we recognize prospectively. Historical revisions have not been material.

Asset Impairment.    If facts and circumstances suggest that a long-lived asset or an intangible asset may be impaired, the carrying value is reviewed. If this review indicates that the value of the asset will not be recoverable, as determined based on projected undiscounted cash flows related to the asset over its remaining life, then the carrying value of the asset is reduced to its estimated fair value.

Share-Based Payments.    We account for our Long-Term Incentive Plan awards under Financial Accounting Standards Board’s (FASB) stock compensation authoritative guidance. This authoritative guidance provides that grants must be accounted for using the fair value method, which requires us to estimate the fair value of the grant and charge or credit the estimated fair value to expense over the service or vesting period of the grant based on fluctuations in value. In addition, this authoritative guidance requires that estimated forfeitures be included in the periodic computation of the fair value of the liability and that the fair value be recalculated at each reporting date over the service or vesting period of the grant.

Recent Accounting Pronouncements

In June 2011, the FASB amended the presentation of comprehensive income. The amendments in this update give us the option to present the total comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. We adopted this amendment on January 1, 2012 and elected to

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present other comprehensive income in a single continuous statement, Consolidated Statements of Comprehensive Income. We also elected to present changes in accumulated other comprehensive income in the Consolidated Statements of Partners’ Capital.

In May 2011, the FASB amended fair value measurement and disclosure requirements. The amendments result in common fair value measurement and disclosure requirements in U.S. GAAP and International Financial Reporting Standards (IFRSs). Some of the amendments clarify the FASB’s intent about the application of existing fair value measurement requirements. Other amendments change a particular principal or requirement for measuring fair value or for disclosing information about fair value measurements. We adopted this amendment on January 1, 2012. The amendment did not have a material impact on our financial position, results of operations, cash flows or notes to the financial statements.

Other accounting standards that have been issued or proposed by the FASB or other standards-setting bodies are not expected to have a material impact on our financial position, results of operations and cash flows.

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Results of Operations

Summary of 2012 and 2011 Royalties and Production

(In thousands, except percent and per ton data)

	For the Years Ended December 31,				Increase (Decrease)		Percentage Change
	2012		2011
Coal royalties
Appalachia
Northern	$	15,768	$	20,578	$	(4,810)		(23	)%
Central		156,390		196,789		(40,399)		(21	)%
Southern		29,325		11,717		17,608		150	%
Total Appalachia		201,483		229,084		(27,601)		(12	)%
Illinois Basin		49,538		41,324		8,214		20	%
Northern Powder River Basin		8,501		7,658		843		11	%
Gulf Coast		1,212		1,155		57		5	%
Total	$	260,734	$	279,221	$	(18,487)		(7	)%
Production (tons)
Appalachia
Northern		10,486		5,251		5,235		100	%
Central		26,098		29,555		(3,457)		(12	)%
Southern		3,718		1,695		2,023		119	%
Total Appalachia		40,302		36,501		3,801		10	%
Illinois Basin		11,299		9,445		1,854		20	%
Northern Powder River Basin		2,377		2,682		(305)		(11	)%
Gulf Coast		466		523		(57)		(11	)%
Total		54,444		49,151		5,293		11	%
Average gross royalty revenue per ton
Appalachia
Northern	$	1.50	$	3.92	$	(2.42)		(62	)%
Central	$	5.99	$	6.66	$	(0.67)		(10	)%
Southern	$	7.89	$	6.91	$	0.98		14	%
Total Appalachia	$	5.00	$	6.28	$	(1.28)		(20	)%
Illinois Basin	$	4.38	$	4.38	$	—		—
Northern Powder River Basin	$	3.58	$	2.86	$	0.72		25	%
Gulf Coast	$	2.60	$	2.21	$	0.39		18	%
Combined average gross royalty revenue per ton	$	4.79	$	5.68	$	(0.89)		16	%
Aggregates
Royalty revenues	$	6,598	$	6,640	$	(42)		(1	)%
Aggregate Bonus Royalty	$	—	$	94	$	(94)		(100	)%
Production		5,287		5,930		(643)		(11	)%
Average gross royalty revenue per ton	$	1.25	$	1.12	$	0.13		12	%
Oil and Gas
Royalty	$	9,160	$	14,017	$	(4,857)		(35	)%

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Coal Royalty Revenues and Production

Coal royalty revenues comprised approximately 69% of our total revenue for the year ended December 31, 2012 and 74% of our total revenue in 2011. The following is a discussion of the coal royalty revenues and production derived from our major coal producing regions:

Appalachia.    The combination of lower production and lower prices in Central Appalachia, together with a lower royalty rate in Northern Appalachia, were the primary reasons coal royalty revenues decreased by $27.6 million in 2012. The 3.5 million ton decrease in production in Central Appalachia was the result of our lessees reducing production in response to the weaker coal market and the effect of some lessees having a lower proportion of production on our properties. Production in Northern Appalachia increased by 5.2 million tons, but these increases were mainly on leases with a lower revenue per ton, and therefore still resulted in reduced revenue of $4.8 million. The decreases are partially offset by an increase in production and revenue in Southern Appalachia, due primarily to one of our lessees resuming production for the entire year after it completed repairs to its preparation plant that was damaged by a tornado in 2011.

Illinois Basin.    Coal royalty revenues and production on our properties were both higher in 2012. Coal royalty revenues increased by $8.2 million and production increased by 1.9 million tons. The increased production was mainly due to production from our Hillsboro property that began longwall operations in the third quarter of 2012. In addition, we had increased production at the Williamson mine.

Northern Powder River Basin.    Our coal royalty revenues increased by $843,000 over last year despite a production decrease of 305,000 tons on our Western Energy property. The lower production was due to the normal variations that occur due to the checkerboard nature of our ownership. The higher revenue per ton was due to the timing of revenue recognition by the lessee in the third quarter.

Aggregates Royalty Revenues and Production

For the year ended December 31, 2012, we recognized $6.6 million in royalty revenue from aggregates. For the same period for 2011, we recognized royalty revenue from aggregates of $6.7 million, which included bonus revenue of $0.1 million under one of our leases. We had production of 5.3 million tons and 5.9 million tons for 2012 and 2011, respectively. Although production declined, our revenue per ton increased and helped keep the royalty revenue nearly constant. Also, we do not include revenues from our frac sand properties in Texas and Wisconsin in aggregate royalties, but include those revenues in overriding royalties. We received $1.5 million in revenues from the Texas property in 2012.

Oil and Gas Royalty Revenues

Oil and gas royalty revenues for the years ended December 31, 2012 and 2011 were $9.2 million and $14.0 million, respectively. In 2012, we saw a significant decline in royalty revenues from our Louisiana BRP properties due to low gas prices and reduced drilling activity, which was offset in part by $1.1 million in royalty revenues received from our recently acquired Oklahoma properties. Included in revenue for the years ended 2012 and 2011 were bonus payments of $2.6 million and $2.1 million, respectively.

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Summary of 2011 and 2010 Royalties and Production

(In thousands, except percent and per ton data)

	For the Years Ended December 31,					Increase (Decrease)			Percentage Change
	2011		2010
Coal royalties
Appalachia
Northern	$	20,578	$	18,676		$	1,902			10	%
Central		196,789		144,934			51,855			36	%
Southern		11,717		19,405			(7,688	)		(40	)%
Total Appalachia		229,084		183,015			46,069			25	%
Illinois Basin		41,324		30,210			11,114			37	%
Northern Powder River Basin		7,658		8,444			(786	)		(9	)%
Gulf Coast		1,155		92			1,063			NMF	*
Total	$	279,221	$	221,761		$	57,460			26	%
Production (tons)
Appalachia
Northern		5,251		4,900			351			7	%
Central		29,555		27,056			2,499			9	%
Southern		1,695		2,824			(1,129	)		(40	)%
Total Appalachia		36,501		34,780			1,721			5	%
Illinois Basin		9,445		7,753			1,692			22	%
Northern Powder River Basin		2,682		4,467			(1,785	)		(40	)%
Gulf Coast		523		52			471			NMF	*
Total		49,151		47,052			2,099			4	%
Average gross royalty revenue per ton
Appalachia
Northern	$	3.92	$	3.81		$	0.11			3	%
Central	$	6.66	$	5.36		$	1.30			24	%
Southern	$	6.91	$	6.87		$	0.04			1	%
Total Appalachia	$	6.28	$	5.26		$	1.02			19	%
Illinois Basin	$	4.38	$	3.90		$	0.48			12	%
Northern Powder River Basin	$	2.86	$	1.89		$	0.97			51	%
Gulf Coast	$	2.21	$	1.77		$	0.44			25	%
Combined average gross royalty revenue per ton	$	5.68	$	4.71		$	0.97			21	%
Aggregates
Royalty revenues	$	6,640	$	4,869		$	1,771			36	%
Aggregate Bonus Royalty	$	94	$	(639	)	$	733			NMF	*
Production		5,930		4,365			1,565			36	%
Average gross royalty revenue per ton	$	1.12	$	1.12		$	—			0	%
Oil and Gas
Royalty	$	14,017	$	7,720		$	6,297			82	%

* (NMF) Not meaningful.

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Coal Royalty Revenues and Production

Coal royalty revenues comprised approximately 74% of our total revenue for both years ended December 31, 2011 and 2010, respectively. The following is a discussion of the coal royalty revenues and production derived from our major coal producing regions:

Appalachia.    Primarily as a result of higher prices being received by our lessees in Northern and Central Appalachia, coal royalty revenues increased by $46.1 million in 2011. The 1.7 million ton increase in production was the result of several of our lessees in Northern and Central Appalachia having a greater proportion of production on our properties or mines moving onto our property. We also benefitted from much higher prices for the significant metallurgical coal production from our Central Appalachia properties. Additionally, repairs were completed at a preparation plant that was damaged by fire in 2010, allowing those mines to produce for the entire year. These increases more than offset the reduction in production in Southern Appalachia caused by a lessee having its preparation plant damaged by a tornado in late April.

Illinois Basin.    Coal royalty revenues and production on our properties were both higher in 2011. Coal royalty revenues increased by $11.1 million and production increased by 1.7 million tons. The increased production was due to production from our Williamson and Macoupin properties. The combination of having a greater proportion of our production from properties with higher royalty rates and our lessees receiving higher prices increased our royalty per ton.

Northern Powder River Basin.    The decrease in both coal royalty revenues of $0.8 million and production of 1.8 million tons on our Western Energy property was due to the normal variations that occur due to the checkerboard nature of our ownership. The higher prices received by our lessee and the resultant higher revenue per ton did help to partially offset some of the lower production.

Aggregates Royalty Revenues and Production

For the year ended December 31, 2011, we recognized $6.7 million in royalty revenue from aggregates, which included a bonus payment of $0.1 million under the terms of one of our leases. For the same period for 2010, we recognized royalty revenue from aggregates of $4.2 million, which included bonus revenue reversal of $0.6 million under the same lease. We had production of 5.9 million tons and 4.4 million tons for each of these years. Although production declined at our largest property in Dupont, Washington, the total production from our properties increased due to our recent acquisitions of additional reserves.

Oil and Gas Royalty Revenues

Oil and gas royalty revenues increased 82% to $14.0 million due to a full year of ownership of the BRP properties. Oil and gas royalty revenues include production revenues as well as bonus payments.

Other Operating Results

Processing and Transportation Revenues.    We generated $8.3 million, $13.5 million and $9.6 million in processing revenues for the years ended December 31, 2012, 2011 and 2010, respectively. Our processing revenues are derived primarily from our ownership of coal preparation plants. We do not operate the preparation plants, but receive a fee for material processed through them. Similar to our coal royalty structure, the throughput fees are based on a percentage of the ultimate sales price for the material that is processed through the facilities. During 2012, lower volumes and prices at our plants in Appalachia coupled with the sale of a preparation plant contributed to lower processing revenues when compared to 2011. The increase in processing revenues for the year ended December 31, 2011 over 2010 is primarily due to higher volumes at higher prices. The increase in 2011 also reflects the addition of the loadout facility at Macoupin being online for a full year.

In addition to our preparation plants, we own coal handling and transportation infrastructure in Illinois. In contrast to our typical royalty structure, we receive a fixed rate per ton for coal transported over these facilities. At the Williamson mine in Illinois, we operate the coal handling and transportation infrastructure and have subcontracted out that responsibility to a third party. We generated transportation fees from these assets of

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approximately $19.5 million, $16.7 million and $14.6 million for the years ended December 31, 2012, 2011 and 2010, respectively. The steady increase in transportation fees from 2010 to 2012 is due to increased volumes from our lessee operations in the Illinois Basin.

Additional Revenues.    In addition to coal royalties, aggregate royalties, oil and gas royalties and processing and transportation revenues, we generated approximately 20%, 13% and 14% of our revenues from other sources for the years ended December 31, 2012, 2011 and 2010, respectively. These other sources include: property taxes, minimums recognized as revenues, overriding royalties, timber, rentals, wheelage and other income. In 2012, we recognized $24.0 million from minimums recognized as revenue. Due to higher minimums recognized as revenue in 2012, the percentage of other revenue is higher than usual in that year. Of the $24.0 million, we recognized $9.6 million on our Gatling Ohio lease and $8.2 million on our Macoupin lease. Also included in other revenue in 2012 is a gain from sale of assets of $13.6 million, including $8.5 million from the sale of a right of way for highway construction and $4.7 million from the sale of a preparation plant.

Operating expenses.    Included in total expenses are:

• Depreciation, depletion and amortization of $58.2 million, $65.1 million and $57.0 million for the years ended December 31, 2012, 2011 and 2010, respectively. Amortization increased during 2011 due to a refinement of our accounting policy for contract amortization. The decrease in 2012 was primarily related to assets acquired from Gatling, LLC and Gatling Ohio, LLC that were impaired during the third and fourth quarters of 2011.

• General and administrative expenses of $29.7 million, $29.6 million and $29.9 million for the years ended December 31, 2012, 2011 and 2010, respectively. General and administrative expenses are primarily impacted by accruals under our long-term incentive plan attributable to fluctuations in our unit price and additional personnel required to manage our properties.

• Property, franchise and other taxes of $17.7 million, $14.5 million and $15.1 million for the years ended December 31, 2012, 2011 and 2010, respectively. A substantial portion of our property taxes is reimbursed to us by our lessees and is reflected as property tax revenue on our statements of comprehensive income. For the year ended December 31, 2012, we recognized higher Kentucky and West Virginia property taxes.

Interest Expense.    Interest expense was $54.0 million, $49.2 million and $41.6 million for the years ended December 31, 2012, 2011 and 2010, respectively. Interest increased due to additional debt incurred in 2012 and 2011 to fund acquisitions.

Liquidity and Capital Resources

Cash Flows and Capital Expenditures

We satisfy our working capital requirements with cash generated from operations. We finance our property acquisitions with available cash, borrowings under our revolving credit facility, and the issuance of our senior notes and additional common units. While our ability to satisfy our debt service obligations and pay distributions to our unitholders depends in large part on our future operating performance, our ability to make acquisitions will depend on prevailing economic conditions in the financial markets as well as the coal, oil and gas and aggregate/industrial minerals industries and other factors, some of which are beyond our control. For a more complete discussion of factors that will affect cash flow we generate from operations, please read “Item 1A. Risk Factors.” Our capital expenditures, other than for acquisitions, have historically been minimal.

During 2012, we continued to review our banking relationships and our internal policies regarding deposit concentrations with specific attention to effectively managing risk in the current banking environment.

Our credit facility does not mature until August 2016 and, as of December 31, 2012, we had $152 million in available capacity under the facility. In addition to the amounts available under our credit facility, we had approximately $149.4 million in cash at December 31, 2012. In January 2013, we acquired the interests in OCI

47

Wyoming described in “Note 15. Subsequent Events.” to our financial statements. In connection with that acquisition, we entered into a three-year, $200 million term loan. The loan requires repayments of $10 million and $20 million in 2014 and 2015, respectively. We also used $16 million of cash on hand to acquire the interests. After the closing of the acquisition, we had still had $152 million in available capacity under our credit facility. We believe that the combination of the capacity under our credit facility and our cash on hand gives us enough liquidity to meet our current financial needs.

We hold a $35 million senior note that matures in June 2013 that we intend to refinance at or prior to its maturity. In addition, because the annual principal payments on our other senior notes will increase significantly beginning in 2013, we may choose to refinance some or all of the principal payments as they come due. To the extent that we use cash on hand to pay the principal payments as they come due, our outstanding principal balance will be reduced on our long-term debt as our minerals are depleted. We do typically access the capital markets to refinance amounts outstanding under our credit facility as we approach the limits under that facility, the timing of which depends on the pace and size of our acquisition program. In August 2011, we amended and extended our credit facility until August 2016. Our debt covenant ratios are in compliance for both our credit facility and our outstanding senior notes. For a more complete discussion of factors that will affect our liquidity, please read “Item 1A. Risk Factors.”

Net cash provided by operations for the years ended December 31, 2012, 2011 and 2010 was $271.4 million, $305.6 million and $258.7 million, respectively. The most significant portion of our cash provided by operations is generated from coal royalty revenues.

Net cash used in investing activities for the years ended December 31, 2012, 2011 and 2010 was $212.7 million, $115.1 million and $170.8 million, respectively. During 2012 the majority of our investing activities consisted of acquiring reserves, plant and equipment and related intangibles as well as assets relating to Sugar Camp. These uses were offset slightly by $24.8 million in proceeds from sale of assets. During 2011 and 2010 substantially all of our investing activities consisted of acquiring reserves, plant and equipment and other rights.

Net cash flows used in financing activities for the years ended December 31, 2012, 2011 and 2010 was $124.2 million, $71.1 million and $75.0 million, respectively. During 2012, 2011 and 2010 we had proceeds from loans of $148.0 million, $385.0 million and $140.0 million, respectively. During 2012, 2011 and 2010 these proceeds were offset by repayment of debt of $30.8 million, $210.5 million and $106.2 million, respectively. Also during 2012, 2011 and 2010 we paid distributions of $240.8 million, $234.8 million and $209.8 million, respectively. During 2010, we had proceeds of $110.4 million relating to issuance of common units as well as a $2.4 million contribution by our general partner.

Contractual Obligations and Commercial Commitments

Credit Facility.    We amended and restated our $300 million revolving credit facility in August 2011, and as of the date of this report we had $152 million available to us under the facility. Under an accordion feature in the credit facility, we may request our lenders to increase their aggregate commitment to a maximum of $500 million on the same terms. However, we cannot be certain that our lenders will elect to participate in the accordion feature. To the extent the lenders decline to participate, we may elect to bring new lenders into the facility, but cannot make any assurance that the additional credit capacity will be available to us on existing or comparable terms.

During 2012, our borrowings and repayments under our credit facility were as follows:

	Quarters Ending
	March 31, 2012		June 30, 2012		September 30, 2012		December 31, 2012
	(In thousands)
Outstanding balance, beginning of period	$	—	$	47,000	$	73,000	$	103,000
Borrowings under credit facility		47,000		26,000		30,000		45,000
Less: Repayments under credit facility		—		—		—		—
Outstanding balance, ending period	$	47,000	$	73,000	$	103,000	$	148,000

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Our obligations under the credit facility are unsecured but are guaranteed by our operating subsidiaries. We may prepay all loans at any time without penalty. Indebtedness under the revolving credit facility bears interest, at our option, at either:

• the Alternate Base Rate (as defined in the credit agreement) plus an applicable margin ranging from 0% to 1%; or

• the Adjusted LIBO Rate (as defined in the credit agreement) plus an applicable margin ranging from 1.00% to 2.25%.

We incur a commitment fee on the unused portion of the revolving credit facility at a rate ranging from 0.18% to 0.40% per annum.

The credit agreement contains covenants requiring us to maintain:

• a ratio of consolidated indebtedness to consolidated EBITDDA (as defined in the credit agreement) not to exceed 4.0 to 1.0; and

• a ratio of consolidated EBITDDA to consolidated fixed charges (consisting of consolidated interest expense and consolidated lease operating expense) not less than 3.5 to 1.0.

Senior Notes.    NRP Operating LLC issued the senior notes listed below under a note purchase agreement as supplemented from time to time. The senior notes are unsecured but are guaranteed by our operating subsidiaries. We may prepay the senior notes at any time together with a make-whole amount (as defined in the note purchase agreement). If any event of default exists under the note purchase agreement, the noteholders will be able to accelerate the maturity of the senior notes and exercise other rights and remedies.

The senior note purchase agreement contains covenants requiring our operating subsidiary to:

• maintain a ratio of consolidated indebtedness to consolidated EBITDA (as defined in the note purchase agreement) of no more than 4.0 to 1.0 for the four most recent quarters;

• not permit debt secured by certain liens and debt of subsidiaries to exceed 10% of consolidated net tangible assets (as defined in the note purchase agreement); and

• maintain the ratio of consolidated EBITDA to consolidated fixed charges (consisting of consolidated interest expense and consolidated operating lease expense) at not less than 3.5 to 1.0.

Term Loan

On January 24, 2013, we issued $200 million in new term debt, which is priced at LIBOR + 2% and adjusts periodically with changes in LIBOR. Interest is payable initially in April 2013, with principal payments of $10.0 million on January 23, 2014, $20.0 million on January 23, 2015 and the balance of $170.0 million on January 23, 2016. The covenants under our term loan are identical to those in our credit facility.

Long-Term Debt

As of the date of this filing, our debt consisted of:

• $148.0 million of our $300 million floating rate revolving credit facility, due August 2016;

• $35.0 million of 5.55% senior notes due 2013;

• $200.0 million floating rate term loan due 2016;

• $27.7 million of 4.91% senior notes due 2018;

• $150.0 million of 8.38% senior notes due 2019;

• $61.5 million of 5.05% senior notes due 2020;

• $1.7 million of 5.31% utility local improvement obligation due 2021;

49

• $30.3 million of 5.55% senior notes due 2023;

• $75.0 million of 4.73% senior notes due 2023;

• $180.0 million of 5.82% senior notes due 2024;

• $50.0 million of 8.92% senior notes due 2024;

• $175.0 million of 5.03% senior notes due 2026; and

• $50.0 million of 5.18% senior notes due 2026.

Other than the 5.55% senior notes due 2013, which have only semi-annual interest payments, all of our senior notes require annual principal payments in addition to semi-annual interest payments. The scheduled principal payments on the 8.38% senior notes due 2019 do not begin until March 2013, the scheduled principal payments on the 8.92% senior notes due 2024 do not begin until March 2014, and the scheduled principal payments on the 4.73%, 5.03% and 5.18% senior notes do not begin until December 2014. We also make annual principal and interest payments on the utility local improvement obligation.

The following table reflects our long-term non-cancelable contractual obligations as of December 31, 2012 (in millions):

	Payments Due by Period
Contractual Obligations	Total		2013		2014		2015		2016		2017		Thereafter
Long-term debt principal payments (including current maturities)(1) (2)	$	984.3	$	87.2	$	81.0	$	81.0	$	229.0	$	81.0	$	425.1
Long-term debt interest payments(3)		278.5		48.1		43.5		38.4		33.3		28.2		87.0
Rental leases(4)		4.1		0.7		0.7		0.7		0.7		0.7		0.6
Total	$	1,266.9	$	136.0	$	125.2	$	120.1	$	263.0	$	109.9	$	512.7

(1) The amounts indicated in the table include principal or interest due on our senior notes, as well as the utility local improvement obligation related to our property in DuPont, Washington. The table also includes the $148.0 million outstanding principal balance under our credit facility, which matures in August 2016.

(2) On January 24, 2013, we entered into a $200 million three year term loan that is not included in the table. We have principal payments due of $10 million in January 2014, $20 million in January 2015 and the remainder due upon maturity in January 2016.

(3) The amounts indicated in the table include interest due on our senior notes as well as the utility local improvement obligation related to our property in DuPont, Washington.

(4) On January 1, 2009, we entered into a ten-year lease agreement for the rental of office space from Western Pocahontas Properties Limited Partnership. The rental obligations from this lease are included in the table above.

Shelf Registration Statement

In addition to our credit facility, on April 24, 2012 we filed an automatically effective shelf registration statement on Form S-3 with the SEC that is available for registered offerings of common units and debt securities. This shelf replaced our previous shelf registration statement, which expired at the end of February 2012. On August 15, 2012, we filed another shelf registration statement that registered all of the common units held by Adena Minerals, as well as up to $500 million in equity or debt securities by NRP. Following the effectiveness of this registration statement, Adena distributed 15,181,716 common units to its shareholders, and we subsequently filed prospectus supplements to register the resale of these common units by those shareholders. We cannot control the resale of the common units by Adena or its shareholders, and the amounts, prices and timing of the issuance and sale of any equity or debt securities by NRP will depend on market conditions, our capital requirements and compliance with our credit facility and senior notes.

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In January 2013, we acquired the interests in OCI Wyoming described in “Recent Acquisitions”. Because this acquisition requires us to file one year of audited financial statements of the acquired business pursuant to Items 2.01 and 9.01 of Form 8-K and Rule 3-05 of Regulation S-X, we will not be able to issue securities under our shelf registration statements until those financial statements are filed with the SEC. We anticipate making this filing by mid-April.

Off-Balance Sheet Transactions

We do not have any off-balance sheet arrangements with unconsolidated entities or related parties and accordingly, there are no off-balance sheet risks to our liquidity and capital resources from unconsolidated entities.

Inflation

Inflation in the United States has been relatively low in recent years and did not have a material impact on operations for the years ended December 31, 2012, 2011 and 2010.

Environmental

The operations our lessees conduct on our properties are subject to federal and state environmental laws and regulations. Please see Item 1, “Business — Regulation and Environmental Matters.” As an owner of surface interests in some properties, we may be liable for certain environmental conditions occurring on the surface properties. The terms of substantially all of our coal leases require the lessee to comply with all applicable laws and regulations, including environmental laws and regulations. Lessees post reclamation bonds assuring that reclamation will be completed as required by the relevant permit, and substantially all of the leases require the lessee to indemnify us against, among other things, environmental liabilities. Some of these indemnifications survive the termination of the lease. Because we have no employees, employees of Western Pocahontas Properties Limited Partnership make regular visits to the mines to ensure compliance with lease terms, but the duty to comply with all regulations rests with the lessees. We believe that our lessees will be able to comply with existing regulations and do not expect any lessee’s failure to comply with environmental laws and regulations to have a material impact on our financial condition or results of operations. We have neither incurred, nor are aware of, any material environmental charges imposed on us related to our properties for the period ended December 31, 2012. We are not associated with any environmental contamination that may require remediation costs. However, our lessees do conduct reclamation work on the properties under lease to them. Because we are not the permittee of the mines being reclaimed, we are not responsible for the costs associated with these reclamation operations. In addition, West Virginia has established a fund to satisfy any shortfall in reclamation obligations.

Related Party Transactions

Partnership Agreement

Our general partner does not receive any management fee or other compensation for its management of Natural Resource Partners L.P. However, in accordance with the partnership agreement, we reimburse our general partner and its affiliates for expenses incurred on our behalf. All direct general and administrative expenses are charged to us as incurred. We also reimburse indirect general and administrative costs, including certain legal, accounting, treasury, information technology, insurance, administration of employee benefits and other corporate services incurred by our general partner and its affiliates.

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The reimbursements to our general partner for services performed by Western Pocahontas Properties and Quintana Minerals Corporation are as follows:

	For the Years Ended December 31,
	2012		2011		2010
	(In thousands)
Reimbursement for services	$	9,791	$	9,136	$	7,358

For additional information, please read “Certain Relationships and Related Transactions, and Director Independence — Omnibus Agreement.”

Transactions with Cline Affiliates

Various companies controlled by Chris Cline lease coal reserves from NRP, and we provide coal transportation services to them for a fee. Mr. Cline, both individually and through affiliated companies, owns a 31% interest in our general partner, as well as 5,659,324 common units, at the time of this filing. At December 31, 2012, we had accounts receivable totaling $6.6 million from Cline affiliates. In addition, the overriding royalty and the lease of the loadout facility at the Sugar Camp mine are classified as contracts receivable of $57.1 million on our Consolidated Balance Sheets. Revenues from the Cline affiliates are as follows:

	For The Years Ended December 31,
	2012		2011		2010
	(In thousands)
Coal royalty revenues	$	48,567	$	42,474	$	32,407
Processing fees		2,409		2,975		1,337
Transportation fees		19,514		16,689		14,324
Minimums recognized as revenue		17,785		—		12,400
Override revenue		4,066		2,691		1,904
Other revenue		—		2,990		—
	$	92,341	$	67,819	$	62,372

As of December 31, 2012, we had received $56.6 million in minimum royalty payments that have not been recouped by Cline affiliates, of which $27.7 million was received in the current year.

We recognized an asset impairment of $90.9 million during the third quarter of 2011 related to certain of our assets at the Gatling West Virginia location and $70.4 million during the fourth quarter of 2011 related to the Gatling Ohio location. During the fourth quarter of 2012, we recognized an additional impairment of $2.6 million related to the assets at the Gatling West Virginia location. These assets were acquired from and are leased by Cline affiliates.

In 2011, we recognized a $3.0 million non-cash gain on a reserve exchange of over one million tons in Illinois with Williamson Energy. The tons received were fully mined during 2012, while the tons exchanged are not included in the current mine plans.

Quintana Capital Group GP, Ltd.

Corbin J. Robertson, Jr. is a principal in Quintana Capital Group GP, Ltd., which controls several private equity funds focused on investments in the energy business. In connection with the formation of Quintana Capital, the Partnership adopted a formal conflicts policy that establishes the opportunities that will be pursued by NRP and those that will be pursued by Quintana Capital. The governance documents of Quintana Capital’s affiliated investment funds reflect the guidelines set forth in NRP’s conflicts policy.

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A fund controlled by Quintana Capital owns a significant membership interest in Taggart Global USA, LLC, including the right to nominate two members of Taggart’s 5-person board of directors. NRP currently has a memorandum of understanding with Taggart Global pursuant to which the two companies have agreed to jointly pursue the development of coal handling and preparation plants. NRP owns and leases the plants to Taggart Global, which designs, builds and operates the plants. The lease payments are based on the sales price for the coal that is processed through the facilities. To date, we have acquired four facilities under this agreement with Taggart with a total cost of $46.6 million. During the third quarter of 2012, we sold one of these facilities back to Taggart for $12.3 million, including $10.5 million in cash and a $1.8 million note receivable. The balance on the note receivable at December 31, 2012 was $1.7 million. Revenues from Taggart are as follows:

	For the Years Ended December 31,
	2012		2011		2010
	(In thousands)
Processing revenue	$	5,580	$	9,755	$	5,874

At December 31, 2012, we had accounts receivable totaling $0.5 million from Taggart.

A fund controlled by Quintana Capital owns Kopper-Glo, a small coal mining company that is one of the Partnership’s lessees with operations in Tennessee. Revenues from Kopper-Glo are as follows:

	For the Years Ended December 31,
	2012		2011		2010
	(In thousands)
Coal royalty revenues	$	3,486	$	1,629	$	1,545

NRP also had accounts receivable totaling $0.3 million from Kopper-Glo at December 31, 2012.

Office Building in Huntington, West Virginia

We lease an office building in Huntington, West Virginia from Western Pocahontas at market rates. The terms of the lease were approved by our Conflicts Committee. We pay $0.6 million each year in lease payments.

Item 7A.    Quantitative and Qualitative Disclosures about Market Risk

We are exposed to market risk, which includes adverse changes in commodity prices and interest rates.

Commodity Price Risk

We are dependent upon the effective marketing of the coal mined by our lessees. Our lessees sell the coal under various long-term and short-term contracts as well as on the spot market. We estimate that over 65% of our coal is currently sold by our lessees under coal supply contracts that have terms of one year or more. Current conditions in the coal industry may make it difficult for our lessees to extend existing contracts or enter into supply contracts with terms of one year or more. Our lessees’ failure to negotiate long-term contracts could adversely affect the stability and profitability of our lessees’ operations and adversely affect our coal royalty revenues. If more coal is sold on the spot market, coal royalty revenues may become more volatile due to fluctuations in spot coal prices.

Interest Rate Risk

Our exposure to changes in interest rates results from borrowings under our credit facility, which are subject to variable interest rates based upon LIBOR or the federal funds rate plus an applicable margin. Management monitors interest rates and may enter into interest rate instruments to protect against increased borrowing costs. At December 31, 2012, we had $148 million outstanding in variable interest debt. If interest rates were to increase by 1%, annual interest expense would increase approximately $1.5 million, assuming the same principal amount remained outstanding during the year.

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Item 8. Financial Statements and Supplementary Data

INDEX TO FINANCIAL STATEMENTS

	Page
Report of independent registered public accounting firm		55
Consolidated balance sheets as of December 31, 2012 and 2011		56
Consolidated statements of comprehensive income for the years ended December  31, 2012, 2011, and 2010		57
Consolidated statements of partners’ capital for the years ended December  31, 2012, 2011 and 2010		58
Consolidated statements of cash flows for the years ended December 31, 2012, 2011 and 2010		59
Notes to consolidated financial statements		60

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NATURAL RESOURCE PARTNERS L.P.

CONSOLIDATED FINANCIAL STATEMENTS

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Partners of Natural Resource Partners L.P.

We have audited the accompanying consolidated balance sheets of Natural Resource Partners L.P. as of December 31, 2012 and 2011, and the related consolidated statements of comprehensive income, partners’ capital, and cash flows for each of the three years in the period ended December 31, 2012. These financial statements are the responsibility of the Partnership’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of Natural Resource Partners L.P. at December 31, 2012 and 2011, and the consolidated results of its operations and its cash flows for each of the three years in the period ended December 31, 2012, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Natural Resource Partners L.P.’s internal control over financial reporting as of December 31, 2012, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 28, 2013 expressed an unqualified opinion thereon.

/s/    Ernst & Young LLP

Houston, Texas

February 28, 2013

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NATURAL RESOURCE PARTNERS L.P.

CONSOLIDATED BALANCE SHEETS

(In thousands, except for unit information)

	December 31, 2012			December 31, 2011
ASSETS
Current assets:
Cash and cash equivalents	$	149,424		$	214,922
Accounts receivable, net of allowance for doubtful accounts		35,116			30,923
Accounts receivable — affiliates		10,613			10,138
Other		1,042			832
Total current assets		196,195			256,815
Land		24,340			24,534
Plant and equipment, net		32,401			46,185
Mineral rights, net		1,380,428			1,257,501
Intangible assets, net		70,811			75,164
Loan financing costs, net		4,291			4,846
Long-term contracts receivable — affiliates		55,576			—
Other assets		630			604
Total assets	$	1,764,672		$	1,665,649
LIABILITIES AND PARTNERS’ CAPITAL
Current liabilities:
Accounts payable and accrued liabilities	$	3,693		$	2,366
Accounts payable — affiliates		957			375
Obligation related to acquisition		—			500
Current portion of long-term debt		87,230			30,801
Accrued incentive plan expenses — current portion		7,718			8,374
Property, franchise and other taxes payable		7,952			6,316
Accrued interest		10,265			10,761
Total current liabilities		117,815			59,493
Deferred revenue		123,506			113,303
Accrued incentive plan expenses		8,865			11,670
Long-term debt		897,039			836,268
Partners’ capital:
Common units outstanding: (106,027,836)		605,019			629,253
General partner’s interest		10,026			10,517
Non-controlling interest		2,845			5,638
Accumulated other comprehensive loss		(443	)		(493	)
Total partners’ capital		617,447			644,915
Total liabilities and partners’ capital	$	1,764,672		$	1,665,649

The accompanying notes are an integral part of these financial statements.

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NATURAL RESOURCE PARTNERS L.P.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(In thousands, except per unit data)

	For the Years Ended December 31,
	2012			2011			2010
Revenues:
Coal royalties	$	260,734		$	279,221		$	221,761
Aggregate royalties		6,598			6,734			4,230
Processing fees		8,299			13,475			9,604
Transportation fees		19,513			16,688			14,564
Oil and gas royalties		9,160			14,017			7,720
Property taxes		15,273			12,640			11,270
Minimums recognized as revenue		23,956			9,148			14,199
Override royalties		15,527			14,523			11,258
Other		20,087			11,237			6,795
Total revenues		379,147			377,683			301,401
Operating expenses:
Depreciation, depletion and amortization		58,221			65,118			56,978
Asset impairments		2,568			161,336			—
General and administrative		29,714			29,553			29,893
Property, franchise and other taxes		17,678			14,486			15,107
Transportation costs		1,944			2,033			1,864
Coal royalty and override payments		1,857			1,022			1,498
Total operating expenses		111,982			273,548			105,340
Income from operations		267,165			104,135			196,061
Other income (expense)
Interest expense		(53,972	)		(49,180	)		(41,635	)
Interest income		162			69			35
Income before non-controlling interest		213,355			55,024			154,461
Non-controlling interest		—			(998	)		—
Net income	$	213,355		$	54,026		$	154,461
Net income attributable to:
General partner	$	4,267		$	1,081		$	2,570
Holders of incentive distribution rights	$	—		$	—		$	25,966
Limited partners	$	209,088		$	52,945		$	125,925
Basic and diluted net income per limited partner unit	$	1.97		$	0.50		$	1.54
Weighted average number of common units outstanding		106,028			106,028			81,917
Comprehensive income	$	213,405		$	54,079		$	154,512

The accompanying notes are an integral part of these financial statements.

57

NATURAL RESOURCE PARTNERS L.P.

CONSOLIDATED STATEMENTS OF PARTNERS’ CAPITAL

(In thousands, except unit data)

	Common Units					General Partner Amounts			Holders of Incentive Distribution Rights Amounts			Non- Controlling Interest Amounts			Accumulated Other Comprehensive Income (Loss)			Total
	Units		Amounts
Balance at December 31, 2009		69,451,136	$	747,437		$	13,409		$	4,977		$	—		$	(597	)	$	765,226
Distributions		—		(174,709	)		(4,197	)		(30,943	)		—			—			(209,849	)
Issuance of common units, net		36,576,700		110,217			—			—			—			—			110,217
Capital contribution		—		—			2,350			—			—			—			2,350
Fees associated with elimination of IDRs		—		(2,341	)		—			—			—			—			(2,341	)
Non-controlling interest		—		—			—			—			5,065			—			5,065
Net income for the year ended December 31, 2010		—		125,925			2,570			25,966			—			—			154,461
Loss on interest hedge		—		—			—			—			—			51			51
Comprehensive income		—		—			—			—			—			51			154,512
Balance at December 31, 2010		106,027,836	$	806,529		$	14,132		$	—		$	5,065		$	(546	)	$	825,180
Distributions		—		(230,080	)		(4,696	)		—			(52	)		—			(234,828	)
Non-controlling interest adjustment		—		—			—			—			(373	)		—			(373	)
Costs associated with equity transactions		—		(141	)		—			—			—			—			(141	)
Non-controlling interest		—		—			—			—			998			—			998
Net income for the year ended December 31, 2011		—		52,945			1,081			—			—			—			54,026
Loss on interest hedge		—		—			—			—			—			53			53
Comprehensive income		—		—			—			—			—			53			54,079
Balance at December 31, 2011		106,027,836	$	629,253		$	10,517		$	—		$	5,638		$	(493	)	$	644,915
Distributions		—		(233,263	)		(4,758	)		—			(2,793	)		—			(240,814	)
Costs associated with equity transactions		—		(59	)		—			—			—			—			(59	)
Net income for the year ended December 31, 2012		—		209,088			4,267			—			—			—			213,355
Loss on interest hedge		—		—			—			—			—			50			50
Comprehensive income		—		—			—			—			—			50			213,405
Balance at December 31, 2012		106,027,836	$	605,019		$	10,026			—		$	2,845		$	(443	)	$	617,447

The accompanying notes are an integral part of these financial statements.

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NATURAL RESOURCE PARTNERS L.P.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

	For the Years Ended December 31,
	2012			2011			2010
Cash flows from operating activities:
Net income	$	213,355		$	54,026		$	154,461
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization		58,221			65,118			56,978
Non-cash interest charge, net		605			625			540
Non-cash gain on reserve swap		—			(2,990	)		—
Gain on sale of assets		(13,575	)		(1,058	)		—
Asset impairment		2,568			161,336			—
Non-controlling interest		—			998			—
Change in operating assets and liabilities:
Accounts receivable		(802	)		(6,951	)		(2,627	)
Other assets		(236	)		90			(27	)
Accounts payable and accrued liabilities		1,909			854			468
Accrued interest		(496	)		950			(489	)
Deferred revenue		11,684			31,277			42,491
Accrued incentive plan expenses		(3,461	)		1,909			6,137
Property, franchise and other taxes payable		1,636			(610	)		762
Net cash provided by operating activities		271,408			305,574			258,694
Cash flows from investing activities:
Acquisition of land, coal, other mineral rights and related intangibles		(180,534	)		(120,284	)		(166,382	)
Acquisition or construction of plant and equipment		(681	)		(404	)		(5,994	)
Proceeds from sale of assets		24,822			5,600			1,580
Return on direct financing lease and contractual override		2,669			—			—
Investment in direct financing lease		(59,009	)		—			—
Net cash used in investing activities		(212,733	)		(115,088	)		(170,796	)
Cash flows from financing activities:
Proceeds from loans		148,000			385,000			140,000
Proceeds from issuance of common units		—			—			110,436
Deferred financing costs		—			(2,957	)		—
Repayments of loans		(30,800	)		(210,519	)		(106,234	)
Payment of obligation related to acquisitions		(500	)		(7,625	)		(9,169	)
Costs associated with equity transactions		(59	)		(141	)		(219	)
Fees associated with elimination of IDRs		—			—			(2,341	)
Distributions		(240,814	)		(234,828	)		(209,849	)
Contributions by general partner		—			—			2,350
Net cash used in financing activities		(124,173	)		(71,070	)		(75,026	)
Net increase (decrease) in cash and cash equivalents		(65,498	)		119,416			12,872
Cash and cash equivalents at beginning of period		214,922			95,506			82,634
Cash and cash equivalents at end of period	$	149,424		$	214,922		$	95,506
Supplemental cash flow information:
Cash paid during the period for interest	$	53,842		$	47,653		$	41,565
Non-cash investing activities:
Liability assumed in acquisitions	$	—		$	—		$	1,593
Non-controlling interest		—			373			(5,065	)
Note receivable related to sale of assets		1,808			—			—
Non-cash financing activities:
Purchase obligation related to reserve and infrastructure acquisitions		—			500			6,200

The accompanying notes are an integral part of these financial statements.

59

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.    Basis of Presentation and Organization

Natural Resource Partners L.P. (the “Partnership”), a Delaware limited partnership, was formed in April 2002. The general partner of the Partnership is NRP (GP) LP (“NRP GP”), a Delaware limited partnership, whose general partner is GP Natural Resource Partners LLC, a Delaware limited liability company. The Partnership engages principally in the business of owning and managing mineral properties in the United States. The Partnership owns coal reserves in the three major coal-producing regions of the United States: Appalachia, the Illinois Basin and the Western United States, as well as lignite reserves in the Gulf Coast region. As of December 31, 2012, the Partnership owned or controlled approximately 2.4 billion tons of proven and probable coal reserves (unaudited), and also owned approximately 500 million tons of aggregate reserves (unaudited) in a number of states across the country. The Partnership does not operate any mines, but leases reserves to experienced mine operators under long-term leases that grant the operators the right to mine reserves in exchange for royalty payments. Lessees are generally required to make royalty payments based on the higher of a percentage of the gross sales price or a fixed price per ton, in addition to a minimum payment.

In addition, the Partnership owns coal and aggregate transportation and preparation equipment, other coal related rights and oil and gas properties on which it earns revenue.

The Partnership’s operations are conducted through, and its operating assets are owned by, its subsidiaries. The Partnership owns its subsidiaries through a wholly owned operating company, NRP (Operating) LLC. NRP GP has sole responsibility for conducting its business and for managing its operations. Because NRP GP is a limited partnership, its general partner, GP Natural Resource Partners LLC, conducts its business and operations, and the board of directors and officers of GP Natural Resource Partners LLC makes decisions on its behalf. Robertson Coal Management LLC, a limited liability company wholly owned by Corbin J. Robertson, Jr., owns all of the membership interest in GP Natural Resource Partners LLC. Mr. Robertson is entitled to nominate all nine of the directors, five of whom must be independent directors, to the board of directors of GP Natural Resource Partners LLC. In connection with the Cline acquisition, Mr. Robertson delegated the right to nominate two of the directors, one of whom must be independent, to Adena Minerals, LLC, an affiliate of the Cline Group.

2.    Summary of Significant Accounting Policies

Principles of Consolidation

The financial statements include the accounts of Natural Resource Partners L.P. and its wholly owned subsidiaries as well as BRP LLC, a venture with International Paper Company controlled by the Partnership. Intercompany transactions and balances have been eliminated.

Business Combinations

For purchase acquisitions accounted for as a business combination, the Partnership is required to record the assets acquired, including identified intangible assets and liabilities assumed at their fair value, which in many instances involves estimates based on third party valuations, such as appraisals, or internal valuations based on discounted cash flow analyses or other valuation techniques.

Use of Estimates

Preparation of the accompanying financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities in the accompanying Consolidated Balance Sheets and the reported amounts of revenues and expenses in the accompanying Consolidated Statements of Comprehensive Income during the reporting period. Actual results could differ from those estimates.

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Fair Value

The Partnership discloses certain assets and liabilities using fair value as defined by FASB’s fair value authoritative guidance. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. See “Note 10. Fair Value Measurements”.

FASB’s guidance describes three levels of inputs that may be used to measure fair value:

• Level 1 — Quoted prices in active markets for identical assets or liabilities.

• Level 2 — Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

• Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.

Cash Equivalents and Restricted Cash

The Partnership considers all highly liquid short-term investments with an original maturity of three months or less to be cash equivalents.

Accounts Receivable

Accounts receivable from the Partnership’s lessees do not bear interest. Receivables are recorded net of the allowance for doubtful accounts in the accompanying Consolidated Balance Sheets. The Partnership evaluates the collectability of its accounts receivable based on a combination of factors. The Partnership regularly analyzes its lessees’ accounts and when it becomes aware of a specific customer’s inability to meet its financial obligations to the Partnership, such as in the case of bankruptcy filings or deterioration in the lessee’s operating results or financial position, the Partnership records a specific reserve for bad debt to reduce the related receivable to the amount it reasonably believes is collectible. Accounts are charged off when collection efforts are complete and future recovery is doubtful. If circumstances related to specific lessees change, the Partnership’s estimates of the recoverability of receivables could be further adjusted.

Land and Mineral Rights

Land and mineral rights owned and leased are recorded at cost. Coal and aggregate mineral rights are depleted on a unit-of-production basis by lease, based upon minerals mined in relation to the net cost of the mineral properties and estimated proven and probable tonnage therein, or over the amortization period of the lease. The Partnership leases its oil and gas minerals interests, all of which are located in the U.S., to third-party entities for the exploration and production of oil and natural gas. Proven producing oil and natural gas mineral rights are depleted on a units of production basis. The Partnership is solely a royalty owner and as a result it does not determine whether or when to develop reserves.

Plant and Equipment

Plant and equipment consists of coal preparation plants, related coal handling facilities, and other coal and aggregate processing and transportation infrastructure. Expenditures for new facilities and expenditures that substantially increase the useful life of property, including interest during construction, are capitalized and reported in the Consolidated Statements of Cash Flows. These assets are recorded at cost and are being depreciated on a straight-line basis over their useful lives, which when originally recorded range from three to twenty years.

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Intangible Assets

The Partnership’s intangible assets consist of above-market contracts. Intangible assets are identified related to contracts acquired when compared to the estimate of current market rates for similar contracts. The estimated fair value of the above-market rate contracts are determined based on the present value of future cash flow projections related to the underlying assets acquired. Intangible assets are amortized on a unit-of-production basis except that a minimum amortization is calculated on a straight line basis for temporarily idled assets.

Deferred Financing Costs

Deferred financing costs consist of legal and other costs related to the issuance of the Partnership’s revolving credit facility and senior notes. These costs are amortized over the term of the debt.

Asset Impairment

If facts and circumstances suggest that a long-lived asset or an intangible asset may be impaired, the carrying value is reviewed. If this review indicates that the value of the asset will not be recoverable, as determined based on projected undiscounted cash flows related to the asset over its remaining life, then the carrying value of the asset is reduced to its estimated fair value.

Revenues

Coal and Aggregate Royalties.    Coal and aggregate royalty revenues are recognized on the basis of tons of mineral sold by the Partnership’s lessees and the corresponding revenue from those sales. Generally, the lessees make payments to the Partnership based on the greater of a percentage of the gross sales price or a fixed price per ton of mineral they sell.

Processing and Transportation Fees.    Processing fees are recognized on the basis of tons of material processed through the facilities by the Partnership’s lessees and the corresponding revenue from those sales. Generally, the lessees of the processing facilities make payments to the Partnership based on the greater of a percentage of the gross sales price or a fixed price per ton of material that is processed and sold from the facilities. The processing leases are structured in a manner so that the lessees are responsible for operating and maintenance expenses associated with the facilities. Transportation fees are recognized on the basis of tons of material transported over the beltlines. Under the terms of the transportation contracts, the Partnership receives a fixed price per ton for all material transported on the beltlines.

Oil and Gas Royalties.    Oil and gas royalties are recognized on the basis of volume of hydrocarbons sold by lessees and the corresponding revenue from those sales. Generally, the lessees make payments based on a percentage of the selling price. Also, included within oil and gas royalties are lease bonus payments, which are generally paid upon the execution of a lease. Some leases are subject to minimum annual payments or delay rentals.

Minimum Royalties.    Most of the Partnership’s lessees must make minimum annual or quarterly payments which are generally recoupable over certain time periods. These minimum payments are recorded as deferred revenue when received. The deferred revenue attributable to the minimum payment is recognized as royalty revenue when the lessee recoups the minimum payment through production. The deferred revenue is recognized as minimums recognized as revenue in the period immediately following the expiration of the lessee’s ability to recoup the payments.

Lessee Audits and Inspections

The Partnership periodically audits lessee information by examining certain records and internal reports of its lessees. The Partnership’s regional managers also perform periodic mine inspections to verify that the information that has been submitted to it is accurate. The audit and inspection processes are designed to identify material variances from lease terms as well as differences between the information reported to the Partnership and the actual results from each property. Audits and inspections, however, are in periods subsequent to when the revenue is reported and any adjustment identified by these processes might be in a reporting period different from when the revenue was initially recorded. Typically there are no material adjustments from this process.

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Property Taxes

The Partnership is responsible for paying property taxes on the properties it owns. Typically, the lessees are contractually responsible for reimbursing the Partnership for property taxes on the leased properties. The reimbursement of property taxes is included in property tax revenue in the Consolidated Statements of Comprehensive Income.

Income Taxes

No provision for income taxes related to the operations of the Partnership has been included in the accompanying financial statements because, as a partnership, it is not subject to federal or material state income taxes and the tax effect of its activities accrues to the unitholders. Net income for financial statement purposes may differ significantly from taxable income reportable to unitholders as a result of differences between the tax bases and financial reporting bases of assets and liabilities. In the event of an examination of the Partnership’s tax return, the tax liability of the partners could be changed if an adjustment in the Partnership’s income is ultimately sustained by the taxing authorities.

Share-Based Payment

The Partnership accounts for awards relating to its Long-Term Incentive Plan using the fair value method, which requires the Partnership to estimate the fair value of the grant, and charge or credit the estimated fair value to expense over the service or vesting period of the grant based on fluctuations in the Partnership’s common unit price. In addition, estimated forfeitures are included in the periodic computation of the fair value of the liability and the fair value is recalculated at each reporting date over the service or vesting period of the grant.

New Accounting Standards

In June 2011, the FASB amended the presentation of comprehensive income. The amendments in this update gave the Partnership the option to present the total comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. The amendments in this update also require the Partnership to present changes in accumulated other comprehensive income by component in the statement of unitholders’ equity or in the notes to the financial statements. The Partnership adopted this amendment on January 1, 2012 and elected to present other comprehensive income in a single continuous statement, Consolidated Statements of Comprehensive Income. The Partnership also elected to present changes in accumulated other comprehensive income in the Consolidated Statements of Partners’ Capital.

In May 2011, the FASB amended fair value measurement and disclosure requirements. The amendments result in common fair value measurement and disclosure requirements in U.S. GAAP and International Financial Reporting Standards (IFRSs). Some of the amendments clarify the FASB’s intent about the application of existing fair value measurement requirements. Other amendments change a particular principal or requirement for measuring fair value or for disclosing information about fair value measurements. The Partnership adopted this amendment on January 1, 2012. The amendment did not have a material impact on its financial position, results of operations, cash flows or notes to the financial statements.

Other accounting standards that have been issued by the FASB or other standards-setting bodies are not expected to have a material impact on the Partnership’s financial position, results of operations and cash flows.

3.    Significant acquisitions

Marcellus Override.    In December 2012, the Partnership acquired an overriding royalty interest on approximately 88,000 net acres of overriding royalty interests in oil and gas reserves located in the Marcellus Shale for $30.3 million.

Colt.    In September 2009, the Partnership signed a definitive agreement to acquire approximately 200 million tons of coal reserves related to the Deer Run Mine in Illinois from Colt, LLC, an affiliate of the Cline Group, through several separate transactions for a total purchase price of $255 million. During the year ended December 31, 2012, the Partnership paid $80.0 million to complete the acquisition of reserves at this mine.

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Oklahoma Oil and Gas.    From December 2011 through June 2012, the Partnership acquired approximately 19,200 net mineral acres located in the Mississippian Lime oil play in Northern Oklahoma for approximately $63.9 million, of which 15,600 net mineral acres were acquired during 2012 for $51.3 million.

Sugar Camp.    In March 2012, the Partnership acquired from Sugar Camp Energy, an affiliate of the Cline Group, the rail loadout and associated infrastructure assets at the Sugar Camp mine in Illinois for total consideration of $50.0 million. At the time of the acquisition, the Partnership also entered into a lease agreement related to the rail loadout and associated facilities that has been accounted for as a direct financing lease. The lease provides for payments based upon tons of coal transported over the facilities subject to quarterly recoupable minimum payments of $1.25 million. The lease is for a term of 20 years but may be extended by the lessee. Total projected remaining payments under the lease at December 31, 2012 are $96.2 million with unearned income of $46.7 million. The unearned income will be reflected as transportation fees over the term of the lease using the effective interest method. Any amounts in excess of the contractual minimums will be recorded as transportation fees when earned. The net amount receivable under the lease as of December 31, 2012 was $49.6 million, of which $1.5 million is included in accounts receivable – affiliates while the remaining is included in long-term contracts receivable — affiliate. The Partnership recognized $3.6 million in transportation fees during the year ended December 31, 2012 related to this lease.

In a separate transaction, the Partnership acquired, from Ruger, LLC, an affiliate of the Cline Group, a contractual overriding royalty interest for $8.9 million that will provide for payments based upon production from specific tons at the Sugar Camp operations. This overriding royalty was accounted for as a financing arrangement and is reflected as an affiliate receivable. The payments the Partnership receives with respect to the overriding royalty will be reflected partially as a return of the initial investment and partially as override revenue over the life of the contract using the effective interest method based upon actual production and adjusted periodically for differences in projected and actual production. The net amount receivable under the agreement as of December 31, 2012 was $7.6 million of which $1.1 million is included in accounts receivable — affiliates while the remaining is included in long-term contracts receivable — affiliate. The Partnership recognized $1.1 million in overriding royalty during the year ended December 31, 2012 related to the contractual overriding royalty interest.

BRP LLC.    In June 2010, the Partnership and International Paper Company (“IPC”) formed BRP to own and manage mineral assets previously owned by IPC. Some of these assets are currently subject to leases, and certain other assets are available for future development by the venture. In exchange for a $42.5 million contribution, NRP became the controlling member with the right to designate two of the three managers of BRP. NRP has a 51% income interest plus a preferential cumulative annual distribution prior to profit sharing. In exchange for the contribution of the producing properties and the properties not currently producing, IPC received $42.5 million in cash, a minority voting interest and a 49% income interest after the preferential cumulative annual distribution. The amount of the preference is fixed throughout the life of the venture but can be reduced by a portion of the proceeds received from sales of producing properties included in the initial acquisition. Identified tangible assets included in the transaction are oil and gas, coal, and aggregate reserves, as well as the rights to other unidentified minerals which may include coal bed methane, geothermal, CO2 sequestration, water rights, precious metals, industrial minerals and base metals. Certain properties, including oil and gas, coal and aggregates, as well as land leased for cell towers, are currently under lease and generating revenues.

Operations of the venture are included from June 1, 2010, the effective date of acquisition. Total net income from startup through December 31, 2010 was $2.3 million and for the years ended December 31, 2011 and 2012 were $5.2 million and $1.7 million, respectively. The venture operating agreement provides that net income of the venture only be allocated to the non-controlling interests after the preferential cumulative annual distribution. The Partnership began receiving cash distributions in 2011. Distributions received totaled $2.5 million and $11.4 million for the years ended December 31, 2011 and 2012, respectively.

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4.     Allowance for Doubtful Accounts

Activity in the allowance for doubtful accounts for the years ended December 31, 2012, 2011 and 2010 was as follows:

	2012		2011			2010
	(In thousands)
Balance, January 1	$	393	$	681		$	372
Provision charged to operations:
Additions to the reserve		318		71			309
Collections of previously reserved accounts		—		(359	)		—
Total charged (credited) to operations		318		(288	)		309
Non-recoverable balances written off		—		—			—
Balance, December 31	$	711	$	393		$	681

5.     Asset Impairments

Gatling West Virginia.    In October 2011, the Partnership was informed by Gatling, LLC, a Cline affiliate, that it was idling the operations and was no longer projecting production from the West Virginia mine. The Partnership and Gatling amended the lease with respect to this property to provide that the existing minimum royalty balance of $24.1 million was non-recoupable, that Gatling pay $3.4 million in non-recoupable minimum royalties when they became due in January and April of 2012, that the minimums would be reduced after the first quarter of 2012, and that Gatling would continue to maintain and ventilate the mine. Following the amendment, Gatling satisfied all terms of the lease. Considering all information available at the time of amendment, the Partnership determined that its investment in the Gatling West Virginia property was not fully recoverable by future cash flows. The assets at the time of amendment included coal reserves, certain above market intangibles and coal transportation equipment.

The 2011 asset impairment of $118.4 million was offset by $24.1 million of recoupable minimum payments received from Gatling, LLC to date and $3.4 million in cash payments received in 2012, resulting in a net asset impairment of $90.9 million, which is included in operating expenses on the Consolidated Statements of Comprehensive Income.

In December 2012, the Partnership was informed by Gatling that it was dismantling their preparation plant and removing it from the site and cancelling the lease effective June 2013. The Partnership considered this new information as another impairment triggering event and reassessed the remaining coal reserves and coal transportation equipment fair values for impairment. The fair values of both the remaining reserves and transportation equipment were determined using Level 2 market approaches based upon recent comparable transactions. The reserves were adjusted for the mine’s specific characteristics. The 2012 asset impairment of $2.6 million is included in operating expenses on the Consolidated Statements of Comprehensive Income.

The net book value and calculated fair values of the assets relating to the Gatling West Virginia operation were as follows:

	2012 Measurement Date				2011 Measurement Date
	Fair Value		Net Book Value		Fair Value		Net Book Value
	(In thousands)
Coal and other mineral rights, net	$	4,050	$	6,618	$	6,618	$	76,003
Intangible assets, net		—		—		—		43,855
Plant and equipment, net		1,981		1,981		2,600		7,775
Total	$	6,031	$	8,599	$	9,218	$	127,633

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Gatling Ohio.    In December 2011, the Partnership was informed by Gatling Ohio, LLC, a Cline affiliate, that it was idling its operations and was no longer projecting production from the Ohio mine. Gatling Ohio’s recoupable minimum royalty balance as of December 31, 2011 was $9.6 million. Considering all information the Partnership determined that its investment in the Gatling Ohio property would not be fully recovered by future cash flows. The assets include coal reserves, certain above market intangibles and coal transportation equipment. The asset impairment of $70.4 million is included in operating expenses in 2011 on the Consolidated Statements of Income.

The net book value as of the measurement date and calculated fair values of the assets relating to the Gatling Ohio operation are as follows:

	2011 Measurement Date
	Fair Value		Net Book Value
	(In thousands)
Coal and other mineral rights, net	$	20,035	$	56,769
Intangible assets, net		—		33,670
Plant and equipment, net		2,947		2,947
Total	$	22,982	$	93,386

In determining the 2011 impairments of the Gatling West Virginia and Gatling Ohio assets, the fair values of the coal rights were estimated using a weighted combination of Level 3 expected cash flow and Level 2 market approaches. The fair values of the transportation equipment were estimated using Level 2 market approaches. The expected cash flows were developed using estimated annual sales tons, as well as forecasted sales prices and anticipated market royalty rates. The market approaches include references to recent comparable transactions that were adjusted for each mine’s specific characteristics. Since Gatling, LLC is no longer projecting production in the near term future for the West Virginia and Ohio properties, the related royalty and transportation contract intangible assets were estimated to have no fair value as of the measurement date.

6.     Plant and Equipment

The Partnership’s plant and equipment consist of the following:

	December 31, 2012			December 31, 2011
	(In thousands)
Plant construction in process	$	—		$	78
Plant and equipment at cost		55,271			67,175
Less accumulated depreciation		(22,870	)		(21,068	)
Net book value	$	32,401		$	46,185

	For the years ended December 31,
	2012		2011		2010
	(In thousands)
Total depreciation expense on plant and equipment	$	6,825	$	8,589	$	8,322

During the third quarter of 2012, the Partnership sold a preparation plant to Taggart Global USA, LLC, a related party, for $12.3 million. See Note 11. “Related Party Transactions” for an understanding of Taggart and the Partnership’s relationship. The Partnership received $10.5 million in cash and a note receivable from Taggart, payable over three years for the balance. The note receivable balance at December 31, 2012 was $1.7 million. The Partnership recorded a gain of $4.7 million included in Other revenues of the Consolidated Statements of Comprehensive Income. The net book value of the asset sold was $7.6 million.

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Under the provisions of one of the Partnership’s tipple leases, the lessee exercised its option to purchase the tipple and corresponding land for fair market value, which is greater than the carrying amount of the asset. In May 2011, the lessee paid a $1.0 million deposit that was nonrefundable. In August 2011, the lessee paid the remaining $4.5 million to complete the purchase of the tipple. The Partnership recognized a gain on the sale in the third quarter of $1.1 million, which is included in Other Revenue on the Consolidated Statements of Comprehensive Income.

7.     Mineral Rights

The Partnership’s mineral rights consist of the following:

	December 31, 2012			December 31, 2011
	(In thousands)
Mineral rights	$	1,815,424		$	1,645,451
Less accumulated depletion and amortization		(434,996	)		(387,950	)
Net book value	$	1,380,428		$	1,257,501

	For the years ended December 31,
	2012		2011		2010
	(In thousands)
Total depletion and amortization expense on mineral interests	$	47,042	$	47,230	$	38,501

8.     Intangible Assets

Amounts recorded as intangible assets along with the balances and accumulated amortization at December 31, 2012 and 2011 are reflected in the table below:

	December 31, 2012			December 31, 2011
	(In thousands)
Contract intangibles	$	89,420		$	89,420
Less accumulated amortization		(18,609	)		(14,256	)
Net book value	$	70,811		$	75,164

	For the years ended December 31,
	2012		2011		2010
	(In thousands)
Total amortization expense on intangible assets	$	4,354	$	9,298	$	10,150

The estimates of amortization expense for the periods as indicated below are based on current mining plans and are subject to revision as those plans change in future periods.

Estimated amortization expense (In thousands)
For year ended December 31, 2013	$	3,818
For year ended December 31, 2014		3,690
For year ended December 31, 2015		3,830
For year ended December 31, 2016		3,830
For year ended December 31, 2017		3,830

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9.     Long-Term Debt

Long-term debt consists of the following:

	December 31, 2012			December 31, 2011
	(In thousands)
$300 million floating rate revolving credit facility, due August 2016	$	148,000		$	—
5.55% senior notes, with semi-annual interest payments in June and December, maturing June 2013		35,000			35,000
4.91% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, maturing in June 2018		27,700			32,317
8.38% senior notes, with semi-annual interest payments in March and September, with scheduled principal payments beginning March 2013, maturing in March 2019		150,000			150,000
5.05% senior notes, with semi-annual interest payments in January and July, with annual principal payments in July, maturing in July 2020		61,538			69,230
5.31% utility local improvement obligation, with annual principal and interest payments, maturing in March 2021		1,731			1,922
5.55% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, maturing in June 2023		30,300			33,600
4.73% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2023		75,000			75,000
5.82% senior notes, with semi-annual interest payments in March and September, with annual principal payments in March, maturing in March 2024		180,000			195,000
8.92% senior notes, with semi-annual interest payments in March and September, with scheduled principal payments beginning March 2014, maturing in March 2024		50,000			50,000
5.03% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2026		175,000			175,000
5.18% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2026		50,000			50,000
Total debt		984,269			867,069
Less — current portion of long term debt		(87,230	)		(30,801	)
Long-term debt	$	897,039		$	836,268

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Principal payments due in:

	Senior Notes		Credit Facility		Total
	(In thousands)
2013	$	87,230	$	—	$	87,230
2014		80,983		—		80,983
2015		80,983		—		80,983
2016		80,983		148,000		228,983
2017		80,983		—		80,983
Thereafter		425,107		—		425,107
	$	836,269	$	148,000	$	984,269

The senior note purchase agreement contains covenants requiring our operating subsidiary to:

• Maintain a ratio of consolidated indebtedness to consolidated EBITDA (as defined in the note purchase agreement) of no more than 4.0 to 1.0 for the four most recent quarters;

• not permit debt secured by certain liens and debt of subsidiaries to exceed 10% of consolidated net tangible assets (as defined in the note purchase agreement); and

• maintain the ratio of consolidated EBITDA to consolidated fixed charges (consisting of consolidated interest expense and consolidated operating lease expense) at not less than 3.5 to 1.0.

The 8.38% and 8.92% senior notes also provide that in the event that the Partnership’s leverage ratio exceeds 3.75 to 1.00 at the end of any fiscal quarter, then in addition to all other interest accruing on these notes, additional interest in the amount of 2.00% per annum shall accrue on the notes for the two succeeding quarters and for as long thereafter as the leverage ratio remains above 3.75 to 1.00.

The Partnership made principal payments of $30.8 million on its senior notes during the year ended December 31, 2012.

On August 10, 2011, the Partnership completed an amendment and restatement of its $300 million revolving credit facility. The amendment extends the term of the credit facility to August 2016. The Partnership incurs a commitment fee on the undrawn portion of the revolving credit facility at rates ranging from 0.18% to 0.40% per annum. Also, the accordion feature in the credit facility, where the Partnership may request its lenders to increase their aggregate commitment to a maximum of $500 million on the same terms.

At December 31, 2012 the Partnership had $148.0 million outstanding on its revolving credit facility, while at December 31, 2011 the Partnership did not have any outstanding balance. The weighted average interest rates for the year ended December 31, 2012 and the year ended December 31, 2011 were 2.09% and 1.83%, respectively.

The revolving credit facility contains covenants requiring the Partnership to maintain:

• a ratio of consolidated indebtedness to consolidated EBITDDA (as defined in the credit agreement) not to exceed 4.0 to 1.0; and

• a ratio of consolidated EBITDDA to consolidated fixed charges (consisting of consolidated interest expense and consolidated lease operating expense) not less than 3.5 to 1.0 for the four most recent quarters.

The Partnership was in compliance with all terms under its long-term debt as of December 31, 2012.

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10.     Fair Value Measurements

The Partnership’s financial instruments consist of cash and cash equivalents, accounts receivable, accounts payable and long-term debt. The carrying amount of the Partnership’s financial instruments included in accounts receivable and accounts payable approximates their fair value due to their short-term nature except for the accounts receivable — affiliate relating to the Sugar Camp override and Taggart preparation plant sale that includes both current and long-term portions. The Partnership’s cash and cash equivalents include money market accounts and are considered a Level 1 measurement. The fair market value and carrying value of the contractual override, Taggart note receivable and long-term senior notes are as follows:

	Fair Value As Of				Carrying Value As Of
	December 31, 2012		December 31, 2011		December 31, 2012		December 31, 2011
	(In thousands)
Assets
Sugar Camp override, current and long-term	$	8,817	$	—	$	7,495	$	—
Taggart plant receivable, current and long term	$	1,668	$	—	$	1,667	$	—
Liabilities
Long-term debt, current and long-term	$	876,574	$	915,959	$	836,269	$	867,069

The fair value of the Sugar Camp override, Taggart plant receivable and long-term debt is estimated by management using comparable term risk-free treasury issues with a market rate component determined by current financial instruments with similar characteristics which is a Level 3 measurement. Since the Partnership’s credit facility is variable rate debt, its fair value approximates its carrying amount.

11.     Related Party Transactions

Reimbursements to Affiliates of our General Partner

The Partnership’s general partner does not receive any management fee or other compensation for its management of Natural Resource Partners L.P. However, in accordance with the partnership agreement, the general partner and its affiliates are reimbursed for expenses incurred on the Partnership’s behalf. All direct general and administrative expenses are charged to the Partnership as incurred. The Partnership also reimburses indirect general and administrative costs, including certain legal, accounting, treasury, information technology, insurance, administration of employee benefits and other corporate services incurred by our general partner and its affiliates.

The reimbursements to affiliates of the Partnership’s general partner for services performed by Western Pocahontas Properties and Quintana Minerals Corporation are as follows:

	For the Years Ended December 31,
	2012		2011		2010
	(In thousands)
Reimbursement for services	$	9,791	$	9,136	$	7,358

The Partnership leases an office building in Huntington, West Virginia from Western Pocahontas Properties and pays $0.6 million in lease payments each year through December 31, 2018.

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Transactions with Cline Affiliates

Various companies controlled by Chris Cline lease coal reserves from the Partnership, and the Partnership provides coal transportation services to them for a fee. Mr. Cline, both individually and through another affiliate, Adena Minerals, LLC, owns a 31% interest in the Partnership’s general partner, as well as 12,617,673 common units at December 31, 2012. At December 31, 2012, the Partnership had accounts receivable totaling $6.6 million from Cline affiliates. In addition, the overriding royalty and the lease of the loadout facility at the Sugar Camp mine are classified as contracts receivable of $57.1 million on the Partnership’s Consolidated Balance Sheets. Revenues from the Cline affiliates are as follows:

	For The Year Ended December 31,
	2012		2011		2010
	(In thousands)
Coal royalty revenues	$	48,567	$	42,474	$	32,407
Processing fees		2,409		2,975		1,337
Transportation fees		19,514		16,689		14,324
Minimums recognized as revenue		17,785		—		12,400
Override revenue		4,066		2,691		1,904
Other revenue		—		2,990		—
	$	92,341	$	67,819	$	62,372

As of December 31, 2012, the Partnership had received $56.6 million in minimum royalty payments that have not been recouped by Cline affiliates, of which $27.7 million was received in the current year.

The Partnership recognized an asset impairment of $90.9 million during the third quarter of 2011 related to certain of the Partnership’s assets at the Gatling WV location and $70.4 million during the fourth quarter of 2011 related to certain assets at the Gatling Ohio location. During the fourth quarter of 2012, the Partnership recognized an additional asset impairment of $2.6 million related to the assets at the Gatling WV location due to receiving a termination notice in December 2012 that the lease is being cancelled as of June 2013. These assets were acquired from and are leased by Cline affiliates.

During 2011 the Partnership recognized a $3.0 million gain on a reserve exchange of over one million tons in Illinois with Williamson Energy. The fair value of the reserves was estimated using Level 3 cash flow approach. The expected cash flows were developed using estimated annual sales tons, forecasted sales prices and anticipated market royalty rates. The tons received were fully mined during 2012, while the tons exchanged are not included in the current mine plans. The gain is located in Other revenues on the Consolidated Statements of Comprehensive Income.

Quintana Capital Group GP, Ltd.

Corbin J. Robertson, Jr. is a principal in Quintana Capital Group GP, Ltd., which controls several private equity funds focused on investments in the energy business. In connection with the formation of Quintana Capital, the Partnership adopted a formal conflicts policy that establishes the opportunities that will be pursued by the Partnership and those that will be pursued by Quintana Capital. The governance documents of Quintana Capital’s affiliated investment funds reflect the guidelines set forth in NRP’s conflicts policy.

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A fund controlled by Quintana Capital owns a significant membership interest in Taggart Global USA, LLC, including the right to nominate two members of Taggart’s 5-person board of directors. The Partnership currently has a memorandum of understanding with Taggart Global pursuant to which the two companies have agreed to jointly pursue the development of coal handling and preparation plants. The Partnership owns and leases the plants to Taggart Global, which designs, builds and operates the plants. The lease payments are based on the sales price for the coal that is processed through the facilities. To date, the Partnership has acquired four facilities under this agreement with Taggart with a total cost of $46.6 million. Revenues from Taggart are as follows:

	For the Years Ended December 31,
	2012		2011		2010
	(In thousands)
Processing revenue	$	5,580	$	9,755	$	5,874

During the third quarter, the Partnership sold a preparation plant back to Taggart Global for $12.3 million. The Partnership received $10.5 million in cash and a note receivable from Taggart, payable over three years for the balance. The note receivable balance at December 31, 2012 was $1.7 million. The Partnership recorded a gain of $4.7 million included in Other income of the Consolidated Statements of Income for the third quarter of 2012. The net book value of the asset sold was $7.6 million. At December 31, 2012, the Partnership had accounts receivable totaling $0.5 million from Taggart.

A fund controlled by Quintana Capital owns Kopper-Glo, a small coal mining company that is one of the Partnership’s lessees with operations in Tennessee. Revenues from Kopper-Glo are as follows:

	For the Years Ended December 31,
	2012		2011		2010
	(In thousands)
Coal royalty revenues	$	3,486	$	1,629	$	1,545

At December 31, 2012, the Partnership also had accounts receivable totaling $0.3 million from Kopper-Glo.

12.    Commitments and Contingencies

Legal

The Partnership is involved, from time to time, in various legal proceedings arising in the ordinary course of business. While the ultimate results of these proceedings cannot be predicted with certainty, Partnership management believes these claims will not have a material effect on the Partnership’s financial position, liquidity or operations.

Environmental Compliance

The operations conducted on the Partnership’s properties by its lessees are subject to environmental laws and regulations adopted by various governmental authorities in the jurisdictions in which these operations are conducted. As owner of surface interests in some properties, the Partnership may be liable for certain environmental conditions occurring at the surface properties. The terms of substantially all of the Partnership’s leases require the lessee to comply with all applicable laws and regulations, including environmental laws and regulations. Lessees post reclamation bonds assuring that reclamation will be completed as required by the relevant permit, and substantially all of the leases require the lessee to indemnify the Partnership against, among other things, environmental liabilities. Some of these indemnifications survive the termination of the lease. The Partnership has neither incurred, nor is aware of, any material environmental charges imposed on it related to its properties as of December 31, 2012. The Partnership is not associated with any environmental contamination that may require remediation costs.

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13.    Major Lessees

The Partnership has the following lessees that generated in excess of ten percent of total revenues in any one of the years ended December 31, 2012, 2011, and 2010. Revenues from these lessees are as follows:

	For the Years Ended December 31,
	2012					2011					2010
	Revenues		Percent			Revenues		Percent			Revenues		Percent
	(Dollars in thousands)
The Cline Group	$	92,341		24.4	%	$	67,819		18.0	%	$	62,372		20.7	%
Alpha Natural Resources	$	81,077		21.4	%	$	107,267		28.4	%	$	79,084		26.2	%

In 2012, the Partnership derived over 45.8% of its revenue from two companies listed above. As a result, the Partnership has a significant concentration of revenues with those lessees, although in most cases, with the exception of the Williamson mine operated by an affiliate of Foresight Energy, the exposure is spread out over a number of different mining operations and leases. Cline’s Williamson mine alone was responsible for approximately 12.4%, 11.7% and 11.5% of our total revenues for 2012, 2011 and 2010, respectively. As a result of the merger of Alpha Natural Resources and Massey Energy Company, all prior period revenues from Massey have been combined with those of Alpha for presentation purposes in this 10-K.

Substantially all of the Partnership’s accounts receivable result from amounts due from third-party companies in the coal industry, with approximately 53% of our total revenues being attributable to coal royalty revenues from Appalachia. This concentration of customers may impact the Partnership’s overall credit risk, either positively or negatively, in that these entities may be collectively affected by the same changes in economic or other conditions. Receivables are generally not collateralized.

14.    Incentive Plans

GP Natural Resource Partners LLC adopted the Natural Resource Partners Long-Term Incentive Plan (the “Long-Term Incentive Plan”) for directors of GP Natural Resource Partners LLC and employees of its affiliates who perform services for the Partnership. The compensation committee of GP Natural Resource Partners LLC’s board of directors administers the Long-Term Incentive Plan. Subject to the rules of the exchange upon which the common units are listed at the time, the board of directors and the compensation committee of the board of directors have the right to alter or amend the Long-Term Incentive Plan or any part of the Long-Term Incentive Plan from time to time. Except upon the occurrence of unusual or nonrecurring events, no change in any outstanding grant may be made that would materially reduce the benefit intended to be made available to a participant without the consent of the participant.

Under the plan a grantee will receive the market value of a common unit in cash upon vesting. Market value is defined as the average closing price over the 20 trading days prior to the vesting date. The compensation committee may make grants under the Long-Term Incentive Plan to employees and directors containing such terms as it determines, including the vesting period. Outstanding grants vest upon a change in control of the Partnership, the general partner, or GP Natural Resource Partners LLC. If a grantee’s employment or membership on the board of directors terminates for any reason, outstanding grants will be automatically forfeited unless and to the extent the compensation committee provides otherwise.

A summary of activity in the outstanding grants for the year ended December 31, 2012 are as follows:

Outstanding grants at the beginning of the period	870,344
Grants during the period	272,150
Grants vested and paid during the period	(189,736	)
Forfeitures during the period	(40,444	)
Outstanding grants at the end of the period	912,314

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Grants typically vest at the end of a four-year period and are paid in cash upon vesting. The liability fluctuates with the market value of the Partnership common units and because of changes in estimated fair value determined each quarter using the Black-Scholes option valuation model. Risk free interest rates and historical volatility are reset at each calculation based on current rates corresponding to the remaining vesting term for each outstanding grant and ranged from 0.18% to 0.35% and 29.39% to 35.157%, respectively at December 31, 2012. The Partnership’s cumulative average dividend rate of 7.03% was used in the calculation at December 31, 2012. The Partnership accrued expenses related to its plans to be reimbursed to its general partner of $2.9 million, $7.4 million and $9.0 million for the years ended December 31, 2012, 2011 and 2010, respectively. In connection with the Long-Term Incentive Plans, cash payments of $6.6 million, $5.7 million and $3.2 million were paid during each of the years ended December 31, 2012, 2011, and 2010, respectively. The grant date fair value was $33.38, $42.93 and $29.42 per unit for awards in 2012, 2011 and 2010, respectively.

In connection with the phantom unit awards, the CNG committee also granted tandem Distribution Equivalent Rights, or DERs, which entitle the holders to receive distributions equal to the distributions paid on the Partnership’s common units. The DERs are payable in cash upon vesting but may be subject to forfeiture if the grantee ceases employment prior to vesting.

The unaccrued cost, associated with unvested outstanding grants and related DERs at December 31, 2012, was $7.7 million.

15.    Subsequent Events (Unaudited)

The following represents material events that have occurred subsequent to December 31, 2012 through the time of the Partnership’s filing its Form 10-K with the SEC:

Distributions

On January 22, 2013, the Partnership declared a distribution of $0.55 per unit to be paid on February 14, 2013 to unitholders of record on February 5, 2013.

Significant Acquisition

On January 24, 2013, the Partnership acquired non-controlling equity interests in OCI Wyoming Co. (OCI Co) and OCI Wyoming, L.P. (OCI LP). The interests are comprised of a 48.51% general partner interest in OCI LP and 20% of the common stock and 100% of the preferred stock in OCI Co. OCI Co owns a 1% limited partnership interest in OCI LP and has the right to receive a $14.5 million annual priority distribution before distributions are paid to other interests. The 80% common interest in OCI Co is owned by OCI Chemical Corporation and the 50.49% interest in OCI LP is owned by OCI Wyoming Holding Co., a subsidiary of OCI Chemical Corporation. The 23,200 shares of preferred stock are subject to certain liquidation preferences in the event of any liquidation, dissolution or winding up of OCI Co at $2,776 per share plus any accrued and unpaid preferred dividends. The liquidation value was $64.4 million at December 31, 2012.

OCI LP’s operations consist of the mining of trona ore, which, when refined, becomes soda ash. All soda ash is sold through an affiliated sales agent to various domestic and European customers and to American Natural Soda Ash Corporation for export. All mining and refining activities take place in one facility located in the Green River Basin, Wyoming. OCI Co’s only significant asset is its ownership interest in OCI LP.

The three investments were acquired from Anadarko Holding Company and its subsidiary, Big Island Trona Company for $292.5 million. The purchase price was funded from the proceeds of a $200 million term loan, $76.5 million in equity and GP interests issued in a private placement and the balance from operating cash. The acquisition agreement provides for a net present value of up to $50 million in cumulative additional contingent consideration should certain performance criteria be met as defined in the purchase and sales agreement in any of 2013, 2014 or 2015.

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Equity and Debt Issuance

As discussed in the Significant Acquisition note above, on January 24, 2013, the Partnership issued approximately 3.8 million common units and $200 million in new term debt in conjunction with the acquisition of its equity interests in OCI Wyoming Co. and OCI Wyoming, L.P. The common units were issued in a private placement and were priced at $19.82 and reflect a 4.5% discount to the volume-weighted average closing price of the Partnership’s common units for the 15 trading days immediately prior to closing. The issuance, along with NRP GP’s capital contribution, generated $76.5 million of new capital used in the acquisition. The Partnership also issued term debt which is priced at LIBOR + 2% and adjusts periodically with changes in LIBOR. The rate was 2.3% at closing and interest is payable initially in April 2013 with principal payments beginning January 23, 2014 of $10.0 million, $20.0 million on January 23, 2015 with the balance due on January 23, 2016. The debt is unsecured but guaranteed by the operating subsidiaries of the Partnership.

16.    Supplemental Financial Data (Unaudited)

Shown below are selected unaudited quarterly data.

Selected Quarterly Financial Information

(In thousands, except per unit data)

2012	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Total revenues	$	91,872	$	90,664	$	94,175	$	102,436
Depreciation, depletion and amortization	$	12,409	$	15,172	$	14,485	$	16,155
Income from operations	$	64,824	$	63,492	$	65,643	$	73,206
Net income	$	51,309	$	49,938	$	52,001	$	60,107
Net income per limited partner unit	$	0.47	$	0.46	$	0.48	$	0.56
Weighted average number of common units outstanding		106,028		106,028		106,028		106,028

2011	First Quarter		Second Quarter		Third Quarter			Fourth Quarter
Total revenues	$	84,852	$	96,532	$	103,164		$	93,135
Depreciation, depletion and amortization	$	14,322	$	17,435	$	19,819		$	13,542
Income (loss) from operations	$	55,861	$	68,670	$	(17,796	)	$	(2,600	)
Net income (loss)	$	45,282	$	56,206	$	(30,559	)	$	(16,903	)
Net income (loss) per limited partner unit	$	0.42	$	0.52	$	(0.28	)	$	(0.16	)
Weighted average number of common units outstanding		106,028		106,028		106,028			106,028

During the Partnership’s third quarter and fourth quarters of 2011, asset impairment charges of $90.9 million, or $0.84 per unit, and $70.4 million, or $0.65 per unit, were recorded. The Partnership recorded an impairment charge of $2.6 million, or $0.2 per unit, in the fourth quarter of 2012.

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Item 9. Changes In and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

We carried out an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rule 13a-15(e) of the Exchange Act) as of December 31, 2012. This evaluation was performed under the supervision and with the participation of our management, including the Chief Executive Officer and Chief Financial Officer of GP Natural Resource Partners LLC, our managing general partner. Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that these disclosure controls and procedures are effective in producing the timely recording, processing, summary and reporting of information and in accumulation and communication of information to management to allow for timely decisions with regard to required disclosures.

Management’s Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rules 13a-15(f) and 15d-15(f). Under the supervision and with the participation of our management, including the Chief Executive Officer and Chief Financial Officer of GP Natural Resource Partners LLC, our managing general partner, we conducted an evaluation of the effectiveness of our internal control over financial reporting as of December 31, 2012 based on the framework in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on that evaluation, our management concluded that our internal control over financial reporting was effective as of December 31, 2012. No changes were made to our internal control over financial reporting during the last fiscal quarter that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Ernst & Young, LLP, the independent registered public accounting firm who audited the Partnership’s consolidated financial statements included in this Form 10-K, has issued a report on the Partnership’s internal control over financial reporting, which is included herein.

Report of Independent Registered Public Accounting Firm

The Partners of Natural Resource Partners L.P.

We have audited Natural Resource Partners L.P.’s internal control over financial reporting as of December 31, 2012, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (the COSO criteria). Natural Resource Partners L.P.’s management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying “Management’s Report on Internal Control Over Financial Reporting”. Our responsibility is to express an opinion on the Partnership’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting

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includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Natural Resource Partners L.P. maintained, in all material respects, effective internal control over financial reporting as of December 31, 2012, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of Natural Resource Partners L.P. as of December 31, 2012 and 2011, and the related consolidated statements of comprehensive income, partners’ capital and cash flows for each of the three years in the period ended December 31, 2012 of Natural Resource Partners L.P. and our report dated February 28, 2013 expressed an unqualified opinion thereon.

/s/     Ernst & Young LLP

Houston, Texas

February 28, 2013

Item 9B.    Other Information

None.

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PART III

Item 10. Directors and Executive Officers of the Managing General Partner and Corporate Governance

As a master limited partnership we do not employ any of the people responsible for the management of our properties. Instead, we reimburse affiliates of our managing general partner, GP Natural Resource Partners LLC, for their services. The following table sets forth information concerning the directors and officers of GP Natural Resource Partners LLC. Each officer and director is elected for their respective office or directorship on an annual basis. Unless otherwise noted below, the individuals served as officers or directors of the partnership since the initial public offering. Subject to the Investor Rights Agreement with Adena Minerals, LLC, Mr. Robertson is entitled to nominate nine directors, five of whom must be independent directors, to the board of directors of GP Natural Resource Partners LLC. Mr. Robertson has delegated the right to nominate two of the directors, one of whom must be independent, to Adena Minerals.

Name	Age		Position with the General Partner
Corbin J. Robertson, Jr.		65	Chairman of the Board and Chief Executive Officer
Nick Carter		66	President and Chief Operating Officer
Dwight L. Dunlap		59	Chief Financial Officer and Treasurer
Kevin F. Wall		56	Executive Vice President — Operations
Wyatt L. Hogan		41	Vice President, General Counsel and Secretary
Dennis F. Coker		45	Vice President, Aggregates
Kevin J. Craig		44	Vice President, Business Development
Kenneth Hudson		58	Controller
Kathy H. Roberts		61	Vice President, Investor Relations
Robert T. Blakely		71	Director
David M. Carmichael		74	Director
J. Matthew Fifield		39	Director
Robert B. Karn III		71	Director
S. Reed Morian		67	Director
W. W. Scott, Jr.		68	Director
Stephen P. Smith		51	Director
Leo A. Vecellio, Jr.		66	Director

Corbin J. Robertson, Jr. has served as Chief Executive Officer and Chairman of the Board of Directors of GP Natural Resource Partners LLC since 2002. Mr. Robertson has vast business experience having founded and served as a director and as an officer of multiple companies, both private and public, and has served on the boards of numerous non-profit organizations. He has served as the Chief Executive Officer and Chairman of the Board of the general partners of Western Pocahontas Properties Limited Partnership since 1986, Great Northern Properties Limited Partnership since 1992, Quintana Minerals Corporation since 1978, and as Chairman of the Board of Directors of New Gauley Coal Corporation since 1986. He also serves as a Principal with Quintana Capital Group, Chairman of the Board of the Cullen Trust for Higher Education and on the boards of the American Petroleum Institute, the National Petroleum Council, the Baylor College of Medicine and the World Health and Golf Association. In 2006, Mr. Robertson was inducted into the Texas Business Hall of Fame.

Nick Carter has served as President and Chief Operating Officer of GP Natural Resource Partners LLC since 2002. He has also served as President of the general partner of Western Pocahontas Properties Limited Partnership and New Gauley Coal Corporation since 1990 and as President of the general partner of Great Northern Properties Limited Partnership from 1992 to 1998. Prior to 1990, Mr. Carter held various positions with MAPCO Coal Corporation and was engaged in the private practice of law. He is Chairman of the National Council of Coal Lessors, a past Chair of the West Virginia Chamber of Commerce and a board member of the Kentucky Coal Association, West Virginia Coal Association, Indiana Coal Council, National Mining Association, ACCCE, Foundation for the Tri-State Community, Inc., Community Trust Bancorp, Inc., Vigo Coal Company, Inc. and Carbo*Prill, Inc.

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Dwight L. Dunlap has served as the Chief Financial Officer and Treasurer of GP Natural Resource Partners LLC since 2002. Mr. Dunlap has served as Vice President and Treasurer of Quintana Minerals Corporation and as Chief Financial Officer, Treasurer and Assistant Secretary of the general partner of Western Pocahontas Properties Limited Partnership, Chief Financial Officer and Treasurer of Great Northern Properties Limited Partnership and Chief Financial Officer, Treasurer and Secretary of New Gauley Coal Corporation since 2000. Mr. Dunlap has worked for Quintana Minerals since 1982 and has served as Vice President and Treasurer since 1987. Mr. Dunlap is a Certified Public Accountant with over 30 years of experience in financial management, accounting and reporting including six years of audit experience with an international public accounting firm.

Kevin F. Wall has served as Executive Vice President — Operations of GP Natural Resource Partners LLC since 2008. Prior to then he served as Vice President — Engineering for GP Natural Resource Partners LLC from 2002-2008, the general partner of Western Pocahontas Properties Limited Partnership since 1998 and the general partner of Great Northern Properties Limited Partnership since 1992. He has also served as the Vice President — Engineering of New Gauley Coal Corporation since 1998. He has performed duties in the land management, planning, project evaluation, acquisition and engineering areas since 1981. He is a Registered Professional Engineer in West Virginia and is a member of the American Institute of Mining, Metallurgical, and Petroleum Engineers and of the National Society of Professional Engineers. Mr. Wall also serves on the Board of Directors of Leadership Tri-State as well as the Board of the Virginia Center for Coal and Energy Research and is a past president of the West Virginia Society of Professional Engineers.

Wyatt L. Hogan has served as Vice President, General Counsel and Secretary of GP Natural Resource Partners LLC since 2003. Mr. Hogan joined NRP in May 2003 from Vinson & Elkins L.L.P., where he practiced corporate and securities law. He has also served since 2003 as the Vice President, General Counsel and Secretary of Quintana Minerals Corporation, General Counsel for the general partner of Western Pocahontas Properties Limited Partnership and as General Counsel and Secretary for the general partner of Great Northern Properties Limited Partnership. He is also member of the Board of Directors of Quintana Minerals Corporation.

Dennis F. Coker is Vice President, Aggregates of GP Natural Resource Partners LLC. Mr. Coker joined NRP in March 2008 from Hanson Building Materials America, where he had been employed since 2002, and most recently served as Director, Corporate Development. Mr. Coker has 18 years of experience in the mining and materials industry, with the last thirteen years focused on corporate development activity. He also represents NRP as one of its appointees to the Partnership Committee for OCI Wyoming L.P. Mr. Coker also serves as the Regional Chair of the Membership Committee for the National Stone Sand and Gravel Association, and formerly served as Chairman of the NSSGA’s Young Leaders Council.

Kevin J. Craig is the Vice President of Business Development for GP Natural Resource Partners LLC. Mr. Craig joined NRP in 2005 from CSX Transportation, where he served as Terminal Manager for the West Virginia Coalfields. He has extensive marketing and finance experience with CSX since 1996. Mr. Craig also serves as a Delegate to the West Virginia House of Delegates having been elected in 2000 and re-elected in 2002, 2004, 2006, 2008, 2010, and 2012. Mr. Craig currently serves as Chairman of the Committee on Natural Resources. Prior to joining CSX, he served as a Captain in the United States Army.

Kenneth Hudson has served as the Controller of GP Natural Resource Partners LLC since 2002. He has served as Controller of the general partner of Western Pocahontas Properties Limited Partnership and of New Gauley Coal Corporation since 1988 and of the general partner of Great Northern Properties Limited Partnership since 1992. He was also Controller of Blackhawk Mining Co., Quintana Coal Co. and other related operations from 1985 to 1988. Prior to that time, Mr. Hudson worked in public accounting.

Kathy H. Roberts is Vice President, Investor Relations of GP Natural Resource Partners LLC. Ms. Roberts joined NRP in July 2002. She was the Principal of IR Consulting Associates from 2001 to July 2002 and from 1980 through 2000 held various financial and investor relations positions with Santa Fe Energy Resources, most recently as Vice President — Public Affairs. She is a Certified Public Accountant. Ms. Roberts currently serves on the Board of Directors of the National Association of Publicly Traded Partnerships and has served on the local board of directors of the National Investor Relations Institute and maintained professional affiliations with various energy industry organizations. She has also served on the Executive Committee and as a National Vice President of the Institute of Management Accountants.

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Robert T. Blakely joined the Board of Directors of GP Natural Resource Partners LLC in January 2003. Mr. Blakely has extensive public company experience having served as Executive Vice President and Chief Financial Officer for several companies. From January 2006 until August 2007, he served as Executive Vice President and Chief Financial Officer of Fannie Mae, and from August 2007 to January 2008 as an Executive Vice President at Fannie Mae. From mid-2003 through January 2006, he was Executive Vice President and Chief Financial Officer of MCI, Inc. He previously served as Executive Vice President and Chief Financial Officer of Lyondell Chemical from 1999 through 2002, Executive Vice President and Chief Financial Officer of Tenneco, Inc. from 1981 until 1999 as well as a Managing Director at Morgan Stanley. He served until December 31, 2011 as a Trustee of the Financial Accounting Foundation and is a trustee emeritus of Cornell University. He has served on the Board of Westlake Chemical Corporation since August 2004. In 2009, Mr. Blakely joined the Boards of Directors of Ally Financial (formerly GMAC, Inc.), where he serves as Chairman of the Audit Committee, and Greenhill & Co.

David M. Carmichael joined the Board of Directors of GP Natural Resource Partners LLC in 2002. While Mr. Carmichael has been a private investor since June 1996, he has formerly served as Chairman and Chief Executive Officer at several public companies. Between 1994 and 1996, he served as Vice Chairman and Chairman of the Management Committee of KN Energy, Inc., a predecessor to Kinder Morgan, Inc. From 1985 until its merger with KN Energy, Inc. in 1994, Mr. Carmichael served as Chairman, Chief Executive Officer and President of American Oil and Gas Corporation. He formed CARCON Corporation in 1984, where he served as President and Chief Executive Officer until its merger into American Oil and Gas Corporation in 1986. From 1976 to 1984, Mr. Carmichael was Chairman and Chief Executive Officer of WellTech, Inc. He served in various senior management positions with Reading and Bates Corporation between 1965 and 1976. He served on the Board of Directors of ENSCO International from 2001 to 2010, Cabot Oil and Gas from 2006 to 2012, and Tom Brown, Inc. from 1997 until 2004. He also currently serves as a trustee of the Texas Heart Institute.

J. Matthew Fifield is a member of the Board of Directors of GP Natural Resource Partners LLC. Mr. Fifield brings coal mining and financial experience to NRP’s board of directors. Mr. Fifield joined NRP’s Board of Directors in January 2007. He currently serves as a Managing Director of AMCI Capital, a mining private equity fund, and AMCI Holdings, a sponsor of AMCI Capital. Previously, Mr. Fifield was a Managing Director at Foresight Management, LLC, a Cline Group affiliate. From 2005 to 2011, he also served as a Managing Director of both Adena Minerals, LLC and Cline Resource & Development Company, both Cline Group affiliates. Prior to joining the Cline Group, Mr. Fifield worked at Resource Capital Funds, a private equity firm focused on metals and mining, in 2004 and 2005. From 1997 to 2000, Mr. Fifield worked in various positions with UBS Warburg, focusing on metals and minerals.

Robert B. Karn III joined the Board of Directors of GP Natural Resource Partners LLC in 2002. Mr. Karn brings extensive financial and coal industry experience to the board of directors. He currently is a consultant and serves on the Board of Directors of various entities. He was the partner in charge of the coal mining practice worldwide for Arthur Andersen from 1981 until his retirement in 1998. He retired as Managing Partner of the St. Louis office’s Financial and Economic Consulting Practice. Mr. Karn is a Certified Public Accountant, Certified Fraud Examiner and has served as president of numerous organizations. He also currently serves on the Board of Directors of Peabody Energy Corporation, Kennedy Capital Management, Inc. and the Board of Trustees of numerous publicly listed closed-end and exchange traded funds of the Guggenheim family of funds.

S. Reed Morian joined the Board of Directors of GP Natural Resource Partners LLC in 2002. Mr. Morian has vast executive business experience having served as Chairman and Chief Executive Officer of several companies since the early 1980s and serving on the board of other companies. Mr. Morian has served as a member of the Board of Directors of the general partner of Western Pocahontas Properties Limited Partnership since 1986, New Gauley Coal Corporation since 1992 and the general partner of Great Northern Properties Limited Partnership since 1992. Mr. Morian worked for Dixie Chemical Company from 1971 to 2006 and served as its Chairman and Chief Executive Officer from 1981 to 2006. He has also served as Chairman, Chief Executive Officer and President of DX Holding Company since 1989. He formerly served on the Board of Directors for the Federal Reserve Bank of Dallas-Houston Branch from April 2003 until December 2008 and as a Director of Prosperity Bancshares, Inc. from March 2005 until April 2009.

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W. W. Scott, Jr. joined the Board of Directors of GP Natural Resource Partners LLC in 2002. Mr. Scott has extensive experience both as a commercial banker and as a Chief Financial Officer. Mr. Scott joined Mr. Robertson’s various companies in the mid-1980s, and retired in 1999. Mr. Scott was Executive Vice President and Chief Financial Officer of Quintana Minerals Corporation from 1985 to 1999. He served as Executive Vice President and Chief Financial Officer of the general partner of Western Pocahontas Properties Limited Partnership and New Gauley Coal Corporation from 1986 to 1999. He served as Executive Vice President and Chief Financial Officer of the general partner of Great Northern Properties Limited Partnership from 1992 to 1999. Since 1999, he has continued to serve as a director of the general partner of Western Pocahontas Properties Limited Partnership and Quintana Minerals Corporation.

Stephen P. Smith joined the Board of Directors of GP Natural Resource Partners LLC in 2004. Mr. Smith brings extensive public company financial experience in the power and energy industries to the board of directors. Mr. Smith has been the Executive Vice President and Chief Financial Officer for NiSource, Inc. since June 2008. Prior to joining NiSource, he held several positions with American Electric Power Company, Inc, including Senior Vice President — Shared Services from January 2008 to June 2008, Senior Vice President and Treasurer from January 2004 to December 2007, and Senior Vice President — Finance from April 2003 to December 2003. From November 2000 to January 2003, Mr. Smith served as President and Chief Operating Officer — Corporate Services for NiSource Inc. Prior to joining NiSource, Mr. Smith served as Deputy Chief Financial Officer for Columbia Energy Group from November 1999 to November 2000 and Chief Financial Officer for Columbia Gas Transmission Corporation and Columbia Gulf Transmission Company from 1996 to 1999.

Leo A. Vecellio, Jr. joined the Board of Directors of GP Natural Resource Partners LLC in May 2007. Mr. Vecellio brings extensive experience in the aggregates and coal mine development industry to the board of directors. Mr. Vecellio and his family have been in the aggregates materials and construction business since the late 1930s. Since November 2002, Mr. Vecellio has served as Chairman and Chief Executive Officer of Vecellio Group, Inc, a major aggregates producer, contractor and oil terminal developer/operator in the Mid-Atlantic and Southeastern states. For nearly 30 years prior to that time Mr. Vecellio served in various capacities with Vecellio & Grogan, Inc., having most recently served as Chairman and Chief Executive Officer from April 1996 to November 2002. Mr. Vecellio is the former Chairman of the American Road and Transportation Builders and is a longtime member of the Florida Council of 100, as well as many other civic and charitable organizations.

Corporate Governance

Board Attendance and Executive Sessions

The Board of Directors met eleven times in 2012. During that period, every director attended all of the board meetings, with the exception of Mr. Blakely, who missed two meetings. Pursuant to our Corporate Governance Guidelines, the non-management directors meet in executive session on a quarterly basis. During 2012, our non-management directors met in executive session four times. The presiding director of these meetings was David Carmichael, the Chairman of our Compensation, Nominating and Governance Committee, or CNG Committee. In addition, our independent directors met one time in executive session in 2012. Mr. Carmichael was the presiding director at this meeting. Interested parties may communicate with our non-management directors by writing a letter to the Chairman of the CNG Committee, NRP Board of Directors, 601 Jefferson St., Suite 3600, Houston, Texas 77002.

Independence of Directors

The Board of Directors has affirmatively determined that Messrs. Blakely, Carmichael, Karn, Smith and Vecellio are independent based on all facts and circumstances considered by the board, including the standards set forth in Section 303A.02(a) of the NYSE’s listing standards. Although we had a majority of independent directors in 2012, because we are a limited partnership as defined in Section 303A of the NYSE’s listing standards, we are not required to do so. The Board has an Audit Committee, Compensation, Nominating and Governance Committee and Conflicts Committee, each of which is staffed solely by independent directors. Our Audit Committee is comprised of Robert B. Karn III, who serves as chairman, Robert T. Blakely, Stephen P.

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Smith and David M. Carmichael. Mr. Karn, Mr. Smith and Mr. Blakely are “Audit Committee Financial Experts” as determined pursuant to Item 407 of Regulation S-K. Mr. Blakely currently serves on four audit committees. In accordance with the rules of the NYSE, our Board of Directors has made the determination that Mr. Blakely’s service on four audit committees does not impair his ability to serve effectively on our audit committee.

Report of the Audit Committee

Our Audit Committee is composed entirely of independent directors. The members of the Audit Committee meet the independence and experience requirements of the New York Stock Exchange. The Committee has adopted, and annually reviews, a charter outlining the practices it follows. The charter complies with all current regulatory requirements.

During the year 2012, at each of its meetings, the Committee met with the senior members of our financial management team, our general counsel and our independent auditors. The Committee had private sessions at certain of its meetings with our independent auditors and the senior members of our financial management team at which candid discussions of financial management, accounting and internal control issues took place.

The Committee approved the engagement of Ernst & Young LLP as our independent auditors for the year ended December 31, 2012 and reviewed with our financial managers and the independent auditors overall audit scopes and plans, the results of internal and external audit examinations, evaluations by the auditors of our internal controls and the quality of our financial reporting.

Management has reviewed the audited financial statements in the Annual Report with the Audit Committee, including a discussion of the quality, not just the acceptability, of the accounting principles, the reasonableness of significant accounting judgments and estimates, and the clarity of disclosures in the financial statements. In addressing the quality of management’s accounting judgments, members of the Audit Committee asked for management’s representations and reviewed certifications prepared by the Chief Executive Officer and Chief Financial Officer that our unaudited quarterly and audited consolidated financial statements fairly present, in all material respects, our financial condition and results of operations, and have expressed to both management and auditors their general preference for conservative policies when a range of accounting options is available.

The Committee also discussed with the independent auditors other matters required to be discussed by the auditors with the Committee by PCAOB Auditing Standard AU Section 380, Communication With Audit Committees. The Committee received and discussed with the auditors their annual written report on their independence from the partnership and its management, which is made under Rule 3526, Communication With Audit Committees Concerning Independence, and considered with the auditors whether the provision of non-audit services provided by them to the partnership during 2012 was compatible with the auditors’ independence.

In performing all of these functions, the Audit Committee acts only in an oversight capacity. The Committee reviews our quarterly and annual reporting on Form 10-Q and Form 10-K prior to filing with the Securities and Exchange Commission. In 2012, the Committee also reviewed quarterly earnings announcements with management and representatives of the independent auditor in advance of their issuance. In its oversight role, the Committee relies on the work and assurances of our management, which has the primary responsibility for financial statements and reports, and of the independent auditors, who, in their report, express an opinion on the conformity of our annual financial statements with U.S. generally accepted accounting principles.

In reliance on these reviews and discussions, and the report of the independent auditors, the Audit Committee has recommended to the Board of Directors, and the Board has approved, that the audited financial statements be included in our Annual Report on Form 10-K for the year ended December 31, 2012, for filing with the Securities and Exchange Commission.

Robert B. Karn III, Chairman

Robert T. Blakely

Stephen P. Smith

David M. Carmichael

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Compensation, Nominating and Governance Committee Authority

Executive officer compensation is administered by the CNG Committee, which is comprised of four members. Mr. Carmichael, the Chairman, and Mr. Karn have served on this committee since 2002, Mr. Blakely joined the committee in early 2003, and Mr. Vecellio joined the committee in 2007. The CNG Committee has reviewed and approved the compensation arrangements described in the Compensation Discussion and Analysis section of this Form 10-K. Our board of directors appoints the CNG Committee and delegates to the CNG Committee responsibility for:

• reviewing and approving the compensation for our executive officers in light of the time that each executive officer allocates to our business;

• reviewing and recommending the annual and long-term incentive plans in which our executive officers participate; and

• reviewing and approving compensation for the board of directors.

Our board of directors has determined that each committee member is independent under the listing standards of the NYSE and the rules of the SEC.

Pursuant to its charter, the CNG Committee is authorized to obtain at NRP’s expense compensation surveys, reports on the design and implementation of compensation programs for directors and executive officers and other data that the CNG Committee considers as appropriate. In addition, the CNG Committee has the sole authority to retain and terminate any outside counsel or other experts or consultants engaged to assist it in the evaluation of compensation of our directors and executive officers.

Section 16(a) Beneficial Ownership Reporting Compliance

Section 16(a) of the Exchange Act requires directors, officers and persons who beneficially own more than ten percent of a registered class of our equity securities to file with the SEC and the NYSE initial reports of ownership and reports of changes in ownership of their equity securities. These people are also required to furnish us with copies of all Section 16(a) forms that they file. Based solely upon a review of the copies of Forms 3, 4 and 5 furnished to us, or written representations from certain reporting persons that no Forms 5 were required for transactions occurring in 2012, we believe that our officers and directors and persons who beneficially own more than ten percent of a registered class of our equity securities complied with all filing requirements with respect to transactions in our equity securities during 2012.

Partnership Agreement

Investors may view our partnership agreement and the amendments to the partnership agreement on our website at www.nrplp.com. The partnership agreement and the amendments are also filed with the SEC and are available in print to any unitholder that requests them.

Corporate Governance Guidelines and Code of Business Conduct and Ethics

We have adopted Corporate Governance Guidelines. We have also adopted a Code of Business Conduct and Ethics that applies to our management, and complies with Item 406 of Regulation S-K. Our Corporate Governance Guidelines and our Code of Business Conduct and Ethics are available on the internet at www.nrplp.com and are available in print upon request.

NYSE Certification

Pursuant to Section 303A of the NYSE Listed Company Manual, in 2012, Corbin J. Robertson, Jr. certified to the NYSE that he was not aware of any violation by the Partnership of NYSE corporate governance listing standards.

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Item 11. Executive Compensation

Compensation Discussion and Analysis

Overview

As a publicly traded partnership, we have a unique employment and compensation structure that is different from that of a typical public corporation. We have no employees, and our executive officers based in Houston, Texas are employed by Quintana Minerals Corporation and our executive officers based in Huntington, West Virginia are employed by Western Pocahontas Properties Limited Partnership, both of which are our affiliates. For a more detailed description of our structure, please see “Item 1. Business – Partnership Structure and Management” in this Form 10-K. Although our executives’ salaries and bonuses are paid directly by the private companies that employ them, we reimburse those companies based on the time allocated to NRP by each executive officer. Our reimbursement for the compensation of executive officers is governed by our partnership agreement.

Executive Officer Compensation Strategy and Philosophy

Under our partnership agreement, we are required to distribute all of our available cash each quarter. Our primary business objective is to generate cash flows at levels that can sustain long-term quarterly cash distributions to our investors. Our executive officer compensation strategy has been designed to motivate and retain our executive officers and to align their interests with those of our unitholders. Our primary objective in determining the compensation of our executive officers is to encourage them to build the partnership in a way that ensures the stability of the cash distributions to our unitholders and growth in our asset base. We do not tie our compensation to achievement of specific financial targets or fixed performance criteria, but rather evaluate the appropriate compensation on an annual basis in light of our overall business objectives.

In accordance with our objective of sustaining and increasing the quarterly distribution over the long-term, we believe that optimal alignment between our unitholders and our executive officers is best achieved by compensating our executive officers through sharing a percentage of distributions received by our general partner and through DERs tied to long-term equity-based compensation. Our compensation for executive officers consists of four primary components:

• base salaries;

• annual cash incentive awards, including bonuses and cash payments made by our general partner based on a percentage of the cash it receives from common units that the general partner owns;

• long-term equity incentive compensation; and

• perquisites and other benefits.

Mr. Robertson does not receive a salary or an annual bonus in his capacity as Chief Executive Officer. Rather, for the reasons discussed in greater detail below, Mr. Robertson is compensated exclusively through long-term phantom unit grants awarded by the CNG Committee and through sharing a percentage of the distributions received by the general partner. Mr. Robertson also directly or indirectly owns in excess of 20% of the outstanding common units of NRP, and thus his interests are directly aligned with our unitholders.

In December of each year, our CNG Committee reviews the performance of the executive officers and the amount of time expected to be spent by each NRP officer on NRP business, and determines the salaries for each officer for the upcoming year. All of our executive officers other than Mr. Robertson spend 95% or more of their time on NRP matters and NRP bears the allocated cost of their time. Mr. Robertson has historically spent approximately 50% of his time on NRP matters.

In February of each year, the CNG Committee approves the year-end bonuses and long-term incentive awards for the executive officers. The CNG Committee considers the performance of the partnership, the performance of the individuals and the outlook for the future in determining the amounts of the awards. Because

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we are a partnership, tax and accounting conventions make it more costly for us to issue additional common units or options as incentive compensation. Consequently, we have no outstanding options or restricted units and have no plans to issue options or restricted units in the future. Instead, we have issued phantom units to our executive officers that are paid in cash based on the average closing price of our common units for the 20-day trading period prior to vesting. The phantom units typically vest four years from the date of grant. In connection with the phantom unit awards, the CNG Committee has also granted tandem DERs, which entitle the holders to receive distributions equal to the distributions paid on our common units. The DERs have a four-year vesting period. Through these awards, each executive officer’s interest is aligned with those of our unitholders in sustaining and increasing our quarterly cash distributions over the long-term, increasing the value of our common units, and maintaining a steady growth profile for NRP.

Role of Compensation Experts

The CNG Committee did not retain any consultants to evaluate compensation of officers or directors in 2012. The CNG Committee periodically has utilized consultants to get a basic sense of the market, but has considered the advice of the consultant as only one factor among the other items discussed in this compensation discussion and analysis. For a more detailed description of the CNG Committee and its responsibilities, please see “Item 10. Directors and Executive Officers of the Managing General Partner and Corporate Governance” in this Form 10-K.

Role of Our Executive Officers in the Compensation Process

Mr. Robertson and Mr. Carter provided recommendations to the CNG Committee in its evaluation of the 2012 compensation programs for our executive officers. Mr. Carter provided Mr. Robertson with recommendations relating to the executive officers, other than himself, that are based in Huntington. Mr. Robertson considered those recommendations and provided the CNG Committee with recommendations for all of the executive officers, including the Houston-based officers other than himself. Mr. Robertson and Mr. Carter relied on their personal experience in setting compensation over a number of years in determining the appropriate amounts for each employee, and considered each of the factors described elsewhere in this compensation discussion and analysis. Mr. Robertson and Mr. Carter attended the CNG Committee meetings at which the Committee deliberated and approved the compensation, but were excused from the meetings when the CNG Committee discussed their compensation. No other named executive officer assumed an active role in the evaluation or design of the 2012 executive officer compensation programs.

Evaluation of 2012 Performance; Components of Compensation

2012 Performance

In 2012, we spent approximately $240 million to acquire additional assets that will help secure the future growth of the partnership. Included in these acquisitions were additional steam coal reserves and transportation infrastructure in Illinois, metallurgical coal reserves in Virginia, oil and gas mineral rights in Oklahoma, an overriding royalty on oil and gas reserves in the liquids-rich portion of the Marcellus Shale play, and an overriding royalty on frac sand reserves in Wisconsin. These efforts are reflective of NRP management’s desire to continue to grow and diversify the partnership to ensure the stability of future revenues and distributions to our unitholders.

In terms of financial performance, in spite of significant headwinds in the coal industry, we recorded record revenues in 2012 of $379.1 million. In addition, our 2012 earnings of $2.00 per unit exceeded our 2011 earnings of $1.99 per unit, after accounting for non-cash impairment charges in both periods. Our distributable cash flow was down 12% compared to 2011, primarily due to increased reserves for principal payments on our senior notes. We also were able to build cash throughout the year to increase our liquidity both for future acquisitions and in anticipation of another difficult year for the coal business in 2013. However, notwithstanding our financial performance in 2012, higher than normal stockpile levels, low natural gas prices and increased costs resulting from more government regulations have caused a number of our operators to idle mines and reduce production heading into 2013. As a result, we did not increase the quarterly distribution to our unitholders in 2012, which is an important criterion for our CNG Committee when considering compensation.

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Finally, in spite of our positive financial results in 2012, the combination of the fact that we did not increase the distribution and the uncertain outlook for the coal industry as a whole resulted in a decline in our common unit price. The CNG Committee considered the lack of a distribution increase, the declining unit price and the other factors listed above with respect to the company performance, as well as individual performance of each member of the executive management team, in determining the compensation levels disclosed herein. Based on its review, the CNG Committee determined to hold 2013 salaries constant as compared to 2012 and the 2012 LTIP awards constant as compared to 2011. The CNG Committee also elected to reduce the 2012 bonuses for the executive officers by 10% below 2011 levels.

Base Salaries

With the exception of Mr. Robertson, who, as described above, does not receive a salary for his services as Chief Executive Officer, our named executive officers are paid an annual base salary by Quintana and Western Pocahontas for services rendered to us by the executive officers during the fiscal year. We then reimburse Quintana and Western Pocahontas based on the time allocated by each executive officer to our business. The base salaries of our named executive officers are reviewed on an annual basis as well as at the time of a promotion or other material change in responsibilities. The CNG Committee reviews and approves the full salaries paid to each executive officer by Quintana and Western Pocahontas, based on both the actual time allocations to NRP in the prior year and the anticipated time allocations in the coming year. Adjustments in base salary are based on an evaluation of individual performance, our partnership’s overall performance during the fiscal year and the individual’s contribution to our overall performance. Based on its review, the CNG Committee approved no increase in the salaries of the executive officers for 2013, down from a 3.0% increase in 2012.

Annual Cash Incentive Awards

Each executive officer, other than Mr. Robertson, participated in two cash incentive programs in 2012. The first program is a discretionary cash bonus award approved in February 2013 by the CNG Committee based on the same criteria used to evaluate the annual base salaries. The bonuses awarded with respect to 2012 under this program are disclosed in the Summary Compensation Table under the Bonus column. As with the base salaries, there are no formulas or specific performance targets related to these awards. For the reasons stated above under “2012 Performance”, the CNG Committee reduced bonuses to the executive officers by an average of 10% as compared to 2011.

Under the second cash incentive program, our general partner has set aside 7.5% of the cash distributions it receives on an annual basis with respect to distributions on common units held by our general partner for awards to our executive officers, including Mr. Robertson. Although Mr. Robertson has the sole discretion to determine the amount of the 7.5% that is allocated to each executive officer, including himself, the cash awards that our officers receive under this plan are reviewed by the CNG Committee and taken into account when making determinations with respect to salaries, bonuses and long-term incentive awards. Because they are ultimately reimbursed by the general partner and not NRP, the incentive payments made with respect to this program do not have any impact on our financial statements or cash available for distribution to our unitholders. Since the cost of these awards is not borne by NRP, we have not disclosed the amounts of these awards in the Summary Compensation Table, but have included the amounts separately in a footnote to the table. The amounts received by the named executive officers, other than Mr. Robertson, were slightly higher in 2012 as a result of the higher per unit distribution relative to 2011. Mr. Robertson’s award was lower due to the fact that he allocated some of the dollars to other members of the management team in 2012 that had not previously shared in these awards. We believe that these awards align the interests of our executive officers directly with our unitholders.

Long-Term Incentive Compensation

At the time of our initial public offering, we adopted the Natural Resource Partners Long-Term Incentive Plan for our directors and all the employees who perform services for NRP, including the executive officers. We consider long-term equity-based incentive compensation to be the most important element of our compensation

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program for executive officers because we believe that these awards keep our officers focused on the growth of NRP, particularly the sustainability and long-term growth of quarterly distributions and their impact on our unit price, over an extended time horizon.

Consistent with this approach, we have included DERs as a possible award to be granted under the plan. The DERs are contingent rights, granted in tandem with phantom units, to receive an amount in cash equal to the cash distributions made by NRP with respect to the common units during the period in which the phantom units are outstanding.

Our CNG Committee has generally approved annual awards of phantom units that vest four years from the date of grant. The amounts included in the compensation table reflect the grant date fair value of the unit awards determined in accordance with FASB stock compensation authoritative guidance. We have structured the phantom unit awards so that our executive officers and directors directly benefit along with our unitholders when our unit price increases, and experience reductions in the value of their incentive awards when our unit price declines. Similarly, because the awards are forfeited by the executives upon termination of employment in most instances, the long-term vesting component of these awards encourages our senior executives and employees to remain with NRP over an extended period of time, thereby ensuring continuity in our management team. This strategy has proved effective as NRP’s senior management team has experienced no turnover since the initial public offering.

In connection with its review of incentive compensation in February 2013, the CNG Committee determined not to increase the annual phantom unit grants to each of the named executive officers.

Perquisites and Other Personal Benefits

Both Quintana and Western Pocahontas maintain employee benefit plans that provide our executive officers and other employees with the opportunity to enroll in health, dental and life insurance plans. Each of these benefit plans require the employee to pay a portion of the health and dental premiums, with the company paying the remainder. These benefits are offered on the same basis to all employees of Quintana and Western Pocahontas, and the company costs are reimbursed by us to the extent the employee allocates time to our business.

Quintana and Western Pocahontas also maintain 401(k) and defined contribution retirement plans. Quintana matches 100% of the first 4.5% of the employee contributions under the 401(k) plan and Western Pocahontas matches the employee contributions at a level of 100% of the first 3% of the contribution and 50% of the next 3% of the contribution. In addition, each company contributes 1/12 of each employee’s base salary to the defined contribution retirement plan on an annual basis. As with the other contributions, any amounts contributed by Quintana and Western Pocahontas are reimbursed by us based on the time allocated by the employee to our business. The payments made to Messrs. Carter, Dunlap, Hogan and Wall under the defined contribution plan exceeded $10,000 in each of 2010, 2011 and 2012, but did not exceed $20,000 for any individual in any year. None of NRP, Quintana or Western Pocahontas maintains a pension plan or a defined benefit retirement plan. As noted in the Summary Compensation Table, in 2010, 2011 and 2012 we also reimbursed Quintana and Western Pocahontas for car allowances provided to Messrs. Carter, Dunlap and Wall.

Unit Ownership Requirements

We do not have any policy or guidelines that require specified ownership of our common units by our directors or executive officers or unit retention guidelines applicable to equity-based awards granted to directors or executive officers. As of December 31, 2012, our named executive officers held 297,000 phantom units that have been granted as compensation. In addition, Mr. Robertson directly or indirectly owns in excess of 20% of the outstanding units of NRP.

Securities Trading Policy

Our insider trading policy states that executive officers and directors may not purchase or sell puts or calls to sell or buy our common units, engage in short sales with respect to our common units, or buy our securities on margin.

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Tax Implications of Executive Compensation

Because we are a partnership, Section 162(m) of the Internal Revenue Code does not apply to compensation paid to our named executive officers and accordingly, the CNG Committee did not consider its impact in determining compensation levels in 2010, 2011 or 2012. The CNG Committee has taken into account the tax implications to the partnership in its decision to limit the long-term incentive compensation to phantom units as opposed to options or restricted units.

Accounting Implications of Executive Compensation

The CNG Committee has considered the partnership accounting implications, particularly the “book-up” cost, of issuing equity as incentive compensation, and has determined that phantom units offer the best accounting treatment for the partnership while still motivating and retaining our executive officers.

Report of the Compensation, Nominating and Governance Committee

The CNG Committee has reviewed and discussed the Compensation Discussion and Analysis required by Item 402(b) of Regulation S-K with management. Based on the reviews and discussions referred to in the foregoing sentence, the CNG Committee recommended to the board of directors that the Compensation Discussion and Analysis be included in our Annual Report on Form 10-K for the year ended December 31, 2012.

David M. Carmichael, Chairman

Robert B. Karn III

Robert T. Blakely

Leo A. Vecellio, Jr.

Summary Compensation Table

The following table sets forth the amounts reimbursed to affiliates of our general partner for compensation expense in 2010, 2011 and 2012 based on time allocated by each individual to Natural Resource Partners. In 2012, Messrs. Robertson, Dunlap, Carter, Hogan and Wall spent approximately 50%, 95%, 97%, 96% and 95%, respectively, of their time on NRP matters.

Name and Principal Position	Year		Salary ($)		Bonus ($)		Phantom Unit Awards(1) ($)		All Other Compensation(2) ($)		Total ($)
Corbin J. Robertson, Jr. Chairman and CEO		2012 2011 2010		— — —		— — —		830,400 1,156,980 783,090		— — —		830,400 1,156,980 783,090
Dwight L. Dunlap CFO and Treasurer		2012 2011 2010		325,189 313,885 298,427		141,000 156,500 140,000		259,500 315,540 189,840		37,577 36,755 36,037		763,266 822,680 664,304
Nick Carter President and COO		2012 2011 2010		378,300 368,600 358,900		221,400 246,000 220,000		415,200 525,900 332,220		39,851 39,228 39,229		1,054,751 1,179,728 950,349
Wyatt L. Hogan Vice President, General Counsel and Secretary		2012 2011 2010		328,337 315,865 295,403		141,000 156,500 140,000		259,500 315,540 189,840		30,988 30,095 29,025		759,825 818,000 654,268
Kevin F. Wall Executive Vice President — Operations		2012 2011 2010		205,485 199,500 190,000		141,000 155,000 140,000		259,500 315,540 189,840		33,781 33,013 31,794		639,766 703,053 551,634

(1) Amounts represent the grant date fair value of unit awards determined in accordance with FASB stock compensation authoritative guidance.

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(2) Includes portions of automobile allowance, 401(k) matching and retirement contributions allocated to Natural Resource Partners by Quintana Minerals Corporation and Western Pocahontas Properties Limited Partnership. The payments made to Messrs. Carter, Dunlap, Hogan and Wall under the defined contribution plan exceeded $10,000 in each of 2010, 2011 and 2012, but did not exceed $20,000 for any individual in any year. The table does not include any cash compensation paid by the general partner to each named executive officer. The general partner may distribute up to 7.5% of any cash it receives with respect to the common units that it received in connection with the elimination of the incentive distribution rights. We do not reimburse the general partner for any of these payments, and the payments are not an expense of NRP. The table below shows the amounts paid by the general partner that are not reimbursed by NRP.

Individual	Year		Compensation Received from  General Partner and Not Reimbursed by NRP $
Corbin J. Robertson, Jr.		2012 2011 2010		456,000 530,000 380,000
Dwight L. Dunlap		2012 2011 2010		391,000 385,000 277,500
Nick Carter		2012 2011 2010		536,000 530,000 380,000
Wyatt L. Hogan		2012 2011 2010		391,000 385,000 277,500
Kevin F. Wall		2012 2011 2010		391,000 385,000 277,500

Grants of Plan-Based Awards in 2012

Named Executive Officer	Grant Date		All Other Unit  Awards: Number of Phantom  Units(1) (#)		Grant Date Fair Value of Unit Awards(2) ($)
Corbin J. Robertson, Jr.		2/14/2012		32,000		830,400
Dwight L. Dunlap		2/14/2012		10,000		259,500
Nick Carter		2/14/2012		16,000		415,200
Wyatt L. Hogan		2/14/2012		10,000		259,500
Kevin F. Wall		2/14/2012		10,000		259,500

(1) The phantom units were granted in February 2012 and will vest in February 2016.

(2) Amounts represent the estimated fair value on February 14, 2012.

None of our executive officers has an employment agreement, and the salary, bonus and phantom unit awards noted above are approved by the CNG Committee. Please see our disclosure in the Compensation Discussion and Analysis section of this Form 10-K for a description of the factors that the CNG Committee considers in determining the amount of each component of compensation.

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Subject to the rules of the exchange upon which the common units are listed at the time, the board of directors and the CNG Committee have the right to alter or amend the Long-Term Incentive Plan or any part of the Long-Term Incentive Plan from time to time. Except upon the occurrence of unusual or nonrecurring events, no change in any outstanding grant may be made that would materially reduce any award to a participant without the consent of the participant.

The CNG Committee may make grants under the Long-Term Incentive Plan to employees and directors containing such terms as it determines, including the vesting period. Outstanding grants vest upon a change in control of NRP, our general partner or GP Natural Resource Partners LLC. If a grantee’s employment or membership on the board of directors terminates for any reason, outstanding grants will be automatically forfeited unless and to the extent the CNG Committee provides otherwise.

As stated above in the Compensation Discussion and Analysis, we have no outstanding option grants, and do not intend to grant any options or restricted unit awards in the future. The CNG Committee regularly makes awards of phantom units on an annual basis in February.

Outstanding Awards at December 31, 2012

The table below shows the total number of outstanding phantom units held by each named executive officer at December 31, 2012. The phantom units shown below have been awarded over the last four years, with a portion of the phantom units vesting in February in each of 2013, 2014, 2015 and 2016.

Named Executive Officer	Number of Phantom Units  That Have Not Vested (#)		Market Value of  Phantom Units That Have Not Vested(1) ($)
Corbin J. Robertson, Jr.		133,000		3,202,090
Dwight L. Dunlap		35,000		832,490
Nick Carter		59,000		1,408,550
Wyatt L. Hogan		35,000		832,490
Kevin F. Wall		35,000		832,490

(1) Based on a unit price of $18.54, the closing price for the common units on December 31, 2012. The value also includes the value of the accrued DERs as of December 31, 2012.

Phantom Units Vested in 2012

The table below shows the phantom units that vested with respect to each named executive officer in 2012, along with the value realized by each individual.

Named Executive Officer	Number of Phantom Units  That Vested (#)		Value Realized  on Vesting ($)
Corbin J. Robertson, Jr.		20,000		709,400
Dwight L. Dunlap		7,000		248,290
Nick Carter		10,000		354,700
Wyatt L. Hogan		7,000		248,290
Kevin F. Wall		7,000		248,290

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Potential Payments upon Termination or Change in Control

None of our executive officers have entered into employment agreements with Natural Resource Partners or its affiliates. Consequently, there are no severance benefits payable to any executive officer upon the termination of their employment. The annual base salaries, bonuses and other compensation are all determined by the CNG Committee in consultation with Mr. Robertson, Mr. Carter and the full board of directors. Upon the occurrence of a change in control of NRP, our general partner or GP Natural Resource Partners LLC, the outstanding phantom unit awards held by each of our executive officers would immediately vest. The table below indicates the impact of a change in control on the outstanding equity-based awards at December 31, 2012, based on the 20-day average of the common units of $17.80 on December 31, 2012 and includes amounts for accrued DERs.

Named Executive Officer	Number of Phantom Units That Have Not Vested (#)		Potential Post-Employment Payments Required Upon Change  in Control ($)		Potential Cash  Payments Required Upon Change  in Control ($)
Corbin J. Robertson, Jr.		133,000		—		3,103,005
Dwight L. Dunlap		35,000		—		806,415
Nick Carter		59,000		—		1,364,595
Wyatt L. Hogan		35,000		—		806,415
Kevin F. Wall		35,000		—		806,415

Director’s Compensation for the Year Ended December 31, 2012

The table below shows the directors’ compensation for the year ended December 31, 2012. As with our named executive officers, we do not grant any options or restricted units to our directors.

Name	Fees Earned or Paid  in Cash ($)		Phantom Unit Awards(1)(2) ($)		Total ($)
Robert Blakely		85,000		104,910		189,910
David Carmichael		85,000		104,910		189,910
J. Matthew Fifield		60,000		104,910		164,910
Robert Karn III		85,000		104,910		189,910
S. Reed Morian		60,000		104,910		164,910
Stephen Smith		65,000		104,910		169,910
W. W. Scott, Jr.		60,000		104,910		164,910
Leo A. Vecellio, Jr.		65,000		104,910		169,910

(1) Amounts represent the grant date fair value of unit awards determined in accordance with FASB stock compensation authoritative guidance.

(2) As of December 31, 2012, each director held 14,130 phantom units that vest in annual increments of 3,375 units in 2013, 3,475 units in 2014, 3,580 units in 2015 and 3,700 units in 2015.

In 2012, the annual retainer for the directors was $60,000, and the directors did not receive any additional fees for attending meetings. Each chairman of a committee received an annual fee of $10,000 for serving as chairman, and each committee member received $5,000 for serving on a committee.

2013 Long-Term Incentive Awards

In February 2013, the CNG Committee awarded 32,000 phantom units to Mr. Robertson, 16,000 phantom units to Mr. Carter, and 10,000 phantom units to each of Messrs. Dunlap, Hogan and Wall. The phantom units included tandem DERs, pursuant to which the phantom units will accrue the quarterly distributions paid by NRP

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on its common units. NRP will pay the amounts accrued under the DERs upon the vesting of the phantom units in February 2017. The CNG Committee also approved an award of 3,700 phantom units, including tandem DERs, to each of the members of the Board of Directors. These phantom units will vest in February 2017.

Compensation Committee Interlocks and Insider Participation

During the fiscal year ended December 31, 2012, Messrs. Carmichael, Karn, Blakely and Vecellio served on the CNG Committee. None of Messrs. Carmichael, Karn, Blakely or Vecellio has ever been an officer or employee of NRP or GP Natural Resource Partners LLC. None of our executive officers serve as a member of the board of directors or compensation committee of any entity that has any executive officer serving as a member of our Board of Directors or CNG Committee.

Item 12. Security Ownership of Certain Beneficial Owners and Management

The following table sets forth, as of February 28, 2013, the amount and percentage of our common units beneficially held by (1) each person known to us to beneficially own 5% or more of any class of our units, (2) by each of the directors and executive officers and (3) by all directors and executive officers as a group. Unless otherwise noted, each of the named persons and members of the group has sole voting and investment power with respect to the units shown.

Name of Beneficial Owner	Common Units		Percentage  of Common Units(1)
Corbin J. Robertson, Jr.(2)		24,061,425		21.9	%
Western Pocahontas Properties(3)		17,279,860		15.7	%
Christopher Cline(4)		5,659,324		5.2	%
Western Bridgeport, Inc.(5)		5,627,120		5.1	%
Nick Carter(6)		22,210		*
Dwight L. Dunlap		20,836		*
Kevin F. Wall(7)		4,000		*
Wyatt L. Hogan(8)		2,500		*
Dennis F. Coker		400		*
Kevin J. Craig		10,000		*
Kenneth Hudson		4,000		*
Kathy H. Roberts		13,000		*
Robert T. Blakely		—		—
David M. Carmichael		10,000		*
J. Matthew Fifield		112,565		*
Robert B. Karn III (9)		5,634		*
S. Reed Morian(10)		6,141,588		5.6	%
W. W. Scott, Jr. (11)		417,422		*
Stephen P. Smith		3,552		*
Leo A. Vecellio, Jr.		20,000		*
Directors and Officers as a Group		30,849,132		28.1	%

* Less than one percent.

(1) Percentages based upon 109,812,408 common units issued and outstanding. Unless otherwise noted, beneficial ownership is less than 1%.

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(2) Mr. Robertson may be deemed to beneficially own the 17,279,860 common units owned by Western Pocahontas Properties Limited Partnership, 5,627,120 common units held by Western Bridgeport, Inc., 110,206 common units held by Western Pocahontas Corporation and 56 common units held by QMP Inc. Also included are 31,540 common units held by Barbara Robertson, Mr. Robertson’s spouse. Mr. Robertson’s address is 601 Jefferson Street, Suite 3600, Houston, Texas 77002.

(3) These common units may be deemed to be beneficially owned by Mr. Robertson. The address of Western Pocahontas Properties Limited Partnership is 601 Jefferson Street, Suite 3600, Houston, Texas 77002.

(4) Of these common units, 4,902,410 are held in margin accounts. Mr. Cline may be deemed to beneficially own 756,914 common units owned by Cutlass Collieries LLC. Mr. Cline’s address is 3801 PGA Boulevard, Suite 903, Palm Beach Gardens, Florida 33410.

(5) These common units may be deemed to be beneficially owned by Mr. Robertson. The address of Western Bridgeport is 601 Jefferson Street, Suite 3600, Houston, Texas 77002.

(6) Includes 210 common units held by Mr. Carter’s spouse.

(7) Includes 500 common units held by Mr. Wall’s daughter. Mr. Wall disclaims beneficial ownership of these securities.

(8) Of these common units, 500 common units are owned by the Anna Margaret Hogan 2002 Trust, 500 common units are owned by the Alice Elizabeth Hogan 2002 Trust, and 500 common units are held by the Ellen Catlett Hogan 2005 Trust. Mr. Hogan is a trustee of each of these trusts.

(9) Includes 317common units held by the Payton Grace Portnoy Irrevocable Trust and 317 common units held by the Blake Kristopher Portnoy Irrevocable Trust. Mr. Karn is the trustee of each of these trusts for his grandchildren, but disclaims beneficial ownership of these securities.

(10) Mr. Morian may be deemed to beneficially own 3,448,624 common units owned by Shadder Investments and 600,972 common units held by Mocol Properties.

(11) Mr. Scott may be deemed to beneficially own 133,907 common units held by Scott Riverbend Farms and 8,000 common units held by his spouse, Kate Scott.

Item 13. Certain Relationships and Related Transactions, and Director Independence

Western Pocahontas Properties Limited Partnership, New Gauley Coal Corporation and Great Northern Properties Limited Partnership are three privately held companies that are primarily engaged in owning and managing mineral properties. We refer to these companies collectively as the WPP Group. Mr. Robertson owns the general partner of Western Pocahontas Properties, 85% of the general partner of Great Northern Properties and is the Chairman and Chief Executive Officer of New Gauley Coal Corporation.

Omnibus Agreement

Non-competition Provisions

As part of the omnibus agreement entered into concurrently with the closing of our initial public offering, the WPP Group and any entity controlled by Corbin J. Robertson, Jr., which we refer to in this section as the GP affiliates, each agreed that neither they nor their affiliates will, directly or indirectly, engage or invest in entities that engage in the following activities (each, a “restricted business”) in the specific circumstances described below:

• the entering into or holding of leases with a party other than an affiliate of the GP affiliate for any GP affiliate-owned fee coal reserves within the United States; and

• the entering into or holding of subleases with a party other than an affiliate of the GP affiliate for coal reserves within the United States controlled by a paid-up lease owned by any GP affiliate or its affiliate.

“Affiliate” means, with respect to any GP affiliate or, any other entity in which such GP affiliate owns, through one or more intermediaries, 50% or more of the then outstanding voting securities or other ownership interests of such entity. Except as described below, the WPP Group and their respective controlled affiliates will not be prohibited from engaging in activities in which they compete directly with us.

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A GP affiliate may, directly or indirectly, engage in a restricted business if:

• the GP affiliate was engaged in the restricted business at the closing of the offering; provided that if the fair market value of the asset or group of related assets of the restricted business subsequently exceeds $10 million, the GP affiliate must offer the restricted business to us under the offer procedures described below.

• the asset or group of related assets of the restricted business have a fair market value of $10 million or less; provided that if the fair market value of the assets of the restricted business subsequently exceeds $10 million, the GP affiliate must offer the restricted business to us under the offer procedures described below.

• the asset or group of related assets of the restricted business have a fair market value of more than $10 million and the general partner (with the approval of the conflicts committee) has elected not to cause us to purchase these assets under the procedures described below.

• its ownership in the restricted business consists solely of a noncontrolling equity interest.

For purposes of this paragraph, “fair market value” means the fair market value as determined in good faith by the relevant GP affiliate.

The total fair market value in the good faith opinion of the WPP Group of all restricted businesses engaged in by the WPP Group, other than those engaged in by the WPP Group at closing of our initial public offering, may not exceed $75 million. For purposes of this restriction, the fair market value of any entity engaging in a restricted business purchased by the WPP Group will be determined based on the fair market value of the entity as a whole, without regard for any lesser ownership interest to be acquired.

If the WPP Group desires to acquire a restricted business or an entity that engages in a restricted business with a fair market value in excess of $10 million and the restricted business constitutes greater than 50% of the value of the business to be acquired, then the WPP Group must first offer us the opportunity to purchase the restricted business. If the WPP Group desires to acquire a restricted business or an entity that engages in a restricted business with a value in excess of $10 million and the restricted business constitutes 50% or less of the value of the business to be acquired, then the GP affiliate may purchase the restricted business first and then offer us the opportunity to purchase the restricted business within six months of acquisition. For purposes of this paragraph, “restricted business” excludes a general partner interest or managing member interest, which is addressed in a separate restriction summarized below. For purposes of this paragraph only, “fair market value” means the fair market value as determined in good faith by the relevant GP affiliate.

If we want to purchase the restricted business and the GP affiliate and the general partner, with the approval of the conflicts committee, agree on the fair market value and other terms of the offer within 60 days after the general partner receives the offer from the GP affiliate, we will purchase the restricted business as soon as commercially practicable. If the GP affiliate and the general partner, with the approval of the conflicts committee, are unable to agree in good faith on the fair market value and other terms of the offer within 60 days after the general partner receives the offer, then the GP affiliate may sell the restricted business to a third party within two years for no less than the purchase price and on terms no less favorable to the GP affiliate than last offered by us. During this two-year period, the GP affiliate may operate the restricted business in competition with us, subject to the restriction on total fair market value of restricted businesses owned in the case of the WPP Group.

If, at the end of the two year period, the restricted business has not been sold to a third party and the restricted business retains a value, in the good faith opinion of the relevant GP affiliate, in excess of $10 million, then the GP affiliate must reoffer the restricted business to the general partner. If the GP affiliate and the general partner, with the approval of the conflicts committee, agree on the fair market value and other terms of the offer within 60 days after the general partner receives the second offer from the GP affiliate, we will purchase the restricted business as soon as commercially practicable. If the GP Affiliate and the general partner, with the concurrence of the conflicts committee, again fail to agree after negotiation in good faith on the fair market value of the restricted business, then the GP affiliate will be under no further obligation to us with respect to the restricted business, subject to the restriction on total fair market value of restricted businesses owned.

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In addition, if during the two-year period described above, a change occurs in the restricted business that, in the good faith opinion of the GP affiliate, affects the fair market value of the restricted business by more than 10 percent and the fair market value of the restricted business remains, in the good faith opinion of the relevant GP affiliate, in excess of $10 million, the GP affiliate will be obligated to reoffer the restricted business to the general partner at the new fair market value, and the offer procedures described above will recommence.

If the restricted business to be acquired is in the form of a general partner interest in a publicly held partnership or a managing member interest in a publicly held limited liability company, the WPP Group may not acquire such restricted business even if we decline to purchase the restricted business. If the restricted business to be acquired is in the form of a general partner interest in a non-publicly held partnership or a managing member of a non-publicly held limited liability company, the WPP Group may acquire such restricted business subject to the restriction on total fair market value of restricted businesses owned and the offer procedures described above.

The omnibus agreement may be amended at any time by the general partner, with the concurrence of the conflicts committee. The respective obligations of the WPP Group under the omnibus agreement terminate when the WPP Group and its affiliates cease to participate in the control of the general partner.

Restricted Business Contribution Agreement

In connection with our partnership with the Cline Group, Christopher Cline, Foresight Reserves LP and Adena (collectively, the “Cline Entities”) and NRP have executed a Restricted Business Contribution Agreement. Pursuant to the terms of the Restricted Business Contribution Agreement, the Cline Entities and their affiliates are obligated to offer to NRP any business owned, operated or invested in by the Cline Entities, subject to certain exceptions, that either (a) owns, leases or invests in hard minerals or (b) owns, operates, leases or invests in transportation infrastructure relating to future mine developments by the Cline Entities in Illinois. In addition, we created an area of mutual interest (the “AMI”) around certain of the properties that we have acquired from Cline. During the applicable term of the Restricted Business Contribution Agreement, the Cline Entities will be obligated to contribute any coal reserves held or acquired by the Cline Entities or their affiliates within the AMI to us. In connection with the offer of mineral properties by the Cline Entities to NRP, the parties to the Restricted Business Contribution Agreement will negotiate and agree upon an area of mutual interest around such minerals, which will supplement and become a part of the AMI.

We have made several acquisitions from the Cline Group pursuant to the Restricted Business Contribution Agreement. For a summary of recent acquisitions and revenues that we have derived from the Cline relationship, please read Management’s Discussion and Analysis of Financial Condition and Results of Operations — Recent Acquisitions and — Transactions with Cline Affiliates in this Form 10-K.

Investor Rights Agreement

NRP and certain affiliates and Adena executed an Investor Rights Agreement pursuant to which Adena was granted certain management rights. Specifically, Adena has the right to name two directors (one of which must be independent) to the board of directors of our managing general partner so long as Adena beneficially owns either 5% of our limited partnership interest or 5% of our general partner’s limited partnership interest and so long as certain rights under our managing general partner’s LLC Agreement have not been exercised by Adena or Mr. Robertson. Adena nominated J. Matthew Fifield and Leo A. Vecellio to serve as the two directors. Mr. Vecellio serves on our CNG Committee. Adena will also have the right, pursuant to the terms of the Investor Rights Agreement, to withhold its consent to the sale or other disposition of any entity or assets contributed by the Cline entities to NRP, and any such sale or disposition will be void without Adena’s consent.

Quintana Capital Group GP, Ltd.

Corbin J. Robertson, Jr. is a principal in Quintana Capital Group GP, Ltd., which controls several private equity funds focused on investments in the energy business. NRP’s Board of Directors has adopted a formal conflicts policy that establishes the opportunities that will be pursued by NRP and those that will be pursued by Quintana Capital. The basic tenets of the policy are set forth below.

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NRP’s business strategy has historically focused on:

• The ownership of natural resource properties in North America, including, but not limited to coal, aggregates and industrial minerals, and oil and gas. NRP leases these properties to mining or operating companies that mine or produce the resources and pay NRP a royalty.

• The ownership and operation of transportation, storage and related logistics activities related to extracted hard minerals.

The businesses and investments described in this paragraph are referred to as the “NRP Businesses.”

NRP has recently expanded its acquisition strategy to include:

• The ownership of non-operating working interests in oil and gas leases.

• The ownership of non-controlling equity interests in companies involved in natural resource development and extraction.

The businesses and investments described in this paragraph are referred to as the “Shared Businesses.”

NRP’s business strategy does not, and is not expected to, include:

• The acquisition of operating interests in oil and gas exploration or development, or the ownership of equity interests in companies involved in the mining or extraction of coal.

• Investments that do not generate “qualifying income” for a publicly traded partnership under U.S. tax regulations.

• Investments outside of North America.

• Midstream or refining businesses that do not involve hard extracted minerals, including the gathering, processing, fractionation, refining, storage or transportation of oil, natural gas or natural gas liquids.

The businesses and investments described in this paragraph are referred to as the “Non-NRP Businesses”.

It is acknowledged that neither Quintana Capital nor Mr. Robertson will have any obligation to offer investments relating to Non-NRP Businesses to NRP, and that NRP will not have any obligation to refrain from pursuing a Non-NRP Business if there is a change in its business strategy.

For so long as Corbin Robertson, Jr. remains both an affiliate of Quintana Capital and an executive officer or director of NRP or an affiliate of its general partner, before making an investment in an NRP Business, Quintana Capital has agreed to adhere to the following procedures:

• Quintana Capital will first offer such opportunity in its entirety to NRP. NRP may elect to pursue such investment wholly for its own account, to pursue the opportunity jointly with Quintana Capital or not to pursue such opportunity.

• If NRP elects not to pursue an NRP Business investment opportunity, Quintana Capital may pursue the investment for its own account on similar terms.

• NRP will undertake to advise Quintana Capital of its decision regarding a potential investment opportunity within 10 business days of the identification of such opportunity to the Conflicts Committee.

If the opportunity relates to the acquisition of a Shared Business, NRP and Quintana Capital will adhere to the following procedures:

• If the opportunity is generated by individuals other than Mr. Robertson, the opportunity will belong to the entity for which those individuals are working.

• If the opportunity is generated by Mr. Robertson and both NRP and Quintana Capital are interested in pursuing the opportunity, it is expected that the Conflicts Committee will work together with the relevant Limited Partner Advisory Committees for Quintana Capital to reach an equitable resolution of the conflict, which may involve investments by both parties.

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In all cases above in which Mr. Robertson has a conflict of interest, investment decisions will be made on behalf of NRP by the Conflicts Committee and on behalf of Quintana Capital Group by the relevant Investment Committee, with Mr. Robertson abstaining.

A fund controlled by Quintana Capital owns a significant membership interest in Taggart Global, including the right to nominate two members of Taggart’s 5-person board of directors. NRP currently has a memorandum of understanding with Taggart Global pursuant to which the two companies have agreed to jointly pursue the development of coal handling and preparation plants. NRP will own and lease the plants to Taggart Global, who will design, build and operate the plants. The lease payments are based on the sales price for the coal that is processed through the facilities. NRP and Taggart Global have jointly financed and developed four such plants in West Virginia.

A fund controlled by Quintana Capital owns Kopper-Glo, a small coal mining company with operations in Tennessee. Kopper-Glo is an NRP lessee that paid NRP $3.5 million and $1.6 million in coal royalties in 2012 and 2011, respectively.

Office Building in Huntington, West Virginia

We lease an office building in Huntington, West Virginia from Western Pocahontas Properties Limited Partnership. The terms of the lease, including $0.6 million per year in lease payments, were approved by our conflicts committee.

Conflicts of Interest

Conflicts of interest exist and may arise in the future as a result of the relationships between our general partner and its affiliates (including the WPP Group, the Cline Group, and their affiliates) on the one hand, and our partnership and our limited partners, on the other hand. The directors and officers of GP Natural Resource Partners LLC have fiduciary duties to manage GP Natural Resource Partners LLC and our general partner in a manner beneficial to its owners. At the same time, our general partner has a fiduciary duty to manage our partnership in a manner beneficial to us and our unitholders.

Whenever a conflict arises between our general partner or its affiliates, on the one hand, and our partnership or any other partner, on the other, our general partner will resolve that conflict. Our general partner may, but is not required to, seek the approval of the conflicts committee of the board of directors of our general partner of such resolution. The partnership agreement contains provisions that allow our general partner to take into account the interests of other parties in addition to our interests when resolving conflicts of interest. In effect, these provisions limit our general partner’s fiduciary duties to our unitholders. Delaware case law has not definitively established the limits on the ability of a partnership agreement to restrict such fiduciary duties. The partnership agreement also restricts the remedies available to unitholders for actions taken by our general partner that might, without those limitations, constitute breaches of fiduciary duty.

Our general partner will not be in breach of its obligations under the partnership agreement or its duties to us or our unitholders if the resolution of the conflict is considered to be fair and reasonable to us. Any resolution is considered to be fair and reasonable to us if that resolution is:

• approved by the conflicts committee, although our general partner is not obligated to seek such approval and our general partner may adopt a resolution or course of action that has not received approval;

• on terms no less favorable to us than those generally being provided to or available from unrelated third parties; or

• fair to us, taking into account the totality of the relationships between the parties involved, including other transactions that may be particularly favorable or advantageous to us.

In resolving a conflict, our general partner, including its conflicts committee, may, unless the resolution is specifically provided for in the partnership agreement, consider:

• the relative interests of any party to such conflict and the benefits and burdens relating to such interest;

• any customary or accepted industry practices or historical dealings with a particular person or entity;

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• generally accepted accounting practices or principles; and

• such additional factors it determines in its sole discretion to be relevant, reasonable or appropriate under the circumstances.

Conflicts of interest could arise in the situations described below, among others.

Actions taken by our general partner may affect the amount of cash available for distribution to unitholders.

The amount of cash that is available for distribution to unitholders is affected by decisions of our general partner regarding such matters as:

• amount and timing of asset purchases and sales;

• cash expenditures;

• borrowings;

• the issuance of additional common units; and

• the creation, reduction or increase of reserves in any quarter.

In addition, borrowings by us and our affiliates do not constitute a breach of any duty owed by our general partner to the unitholders, including borrowings that have the purpose or effect of enabling our general partner to receive distributions on the incentive distribution rights.

For example, in the event we have not generated sufficient cash from our operations to pay the quarterly distribution on our common units, our partnership agreement permits us to borrow funds which may enable us to make this distribution on all outstanding common units.

The partnership agreement provides that we and our subsidiaries may borrow funds from our general partner and its affiliates. Our general partner and its affiliates may not borrow funds from us or our subsidiaries.

We do not have any officers or employees and rely solely on officers and employees of GP Natural Resource Partners LLC and its affiliates.

We do not have any officers or employees and rely solely on officers and employees of GP Natural Resource Partners LLC and its affiliates. Affiliates of GP Natural Resource Partners LLC conduct businesses and activities of their own in which we have no economic interest. If these separate activities are significantly greater than our activities, there could be material competition for the time and effort of the officers and employees who provide services to our general partner. The officers of GP Natural Resource Partners LLC are not required to work full time on our affairs. These officers devote significant time to the affairs of the WPP Group or its affiliates and are compensated by these affiliates for the services rendered to them.

We reimburse our general partner and its affiliates for expenses.

We reimburse our general partner and its affiliates for costs incurred in managing and operating us, including costs incurred in rendering corporate staff and support services to us. The partnership agreement provides that our general partner determines the expenses that are allocable to us in any reasonable manner determined by our general partner in its sole discretion.

Our general partner intends to limit its liability regarding our obligations.

Our general partner intends to limit its liability under contractual arrangements so that the other party has recourse only to our assets, and not against our general partner or its assets. The partnership agreement provides that any action taken by our general partner to limit its liability or our liability is not a breach of our general partner’s fiduciary duties, even if we could have obtained more favorable terms without the limitation on liability.

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Common unitholders have no right to enforce obligations of our general partner and its affiliates under agreements with us.

Any agreements between us on the one hand, and our general partner and its affiliates, on the other, do not grant to the unitholders, separate and apart from us, the right to enforce the obligations of our general partner and its affiliates in our favor.

Contracts between us, on the one hand, and our general partner and its affiliates, on the other, are not the result of arm’s-length negotiations.

The partnership agreement allows our general partner to pay itself or its affiliates for any services rendered to us, provided these services are rendered on terms that are fair and reasonable. Our general partner may also enter into additional contractual arrangements with any of its affiliates on our behalf. Neither the partnership agreement nor any of the other agreements, contracts and arrangements between us, on the one hand, and our general partner and its affiliates, on the other, are the result of arm’s-length negotiations.

All of these transactions entered into after our initial public offering are on terms that are fair and reasonable to us.

Our general partner and its affiliates have no obligation to permit us to use any facilities or assets of our general partner and its affiliates, except as may be provided in contracts entered into specifically dealing with that use. There is no obligation of our general partner or its affiliates to enter into any contracts of this kind.

We may not choose to retain separate counsel for ourselves or for the holders of common units.

The attorneys, independent auditors and others who have performed services for us in the past were retained by our general partner, its affiliates and us and have continued to be retained by our general partner, its affiliates and us. Attorneys, independent auditors and others who perform services for us are selected by our general partner or the conflicts committee and may also perform services for our general partner and its affiliates. We may retain separate counsel for ourselves or the holders of common units in the event of a conflict of interest arising between our general partner and its affiliates, on the one hand, and us or the holders of common units, on the other, depending on the nature of the conflict. We do not intend to do so in most cases. Delaware case law has not definitively established the limits on the ability of a partnership agreement to restrict such fiduciary duties.

Our general partner’s affiliates may compete with us.

The partnership agreement provides that our general partner is restricted from engaging in any business activities other than those incidental to its ownership of interests in us. Except as provided in our partnership agreement, the Omnibus Agreement and the Restricted Business Contribution Agreement, affiliates of our general partner will not be prohibited from engaging in activities in which they compete directly with us.

Director Independence

For a discussion of the independence of the members of the board of directors of our managing general partner under applicable standards, please read “Item 10. Directors and Executive Officers of the Managing General Partner and Corporate Governance — Corporate Governance — Independence of Directors,” which is incorporated by reference into this Item 13.

Review, Approval or Ratification of Transactions with Related Persons

If a conflict or potential conflict of interest arises between our general partner and its affiliates (including the WPP Group, the Cline Group, and their affiliates) on the one hand, and our partnership and our limited partners, on the other hand, the resolution of any such conflict or potential conflict is addressed as described under “— Conflicts of Interest.”

Pursuant to our Code of Business Conduct and Ethics, conflicts of interest are prohibited as a matter of policy, except under guidelines approved by the Board of Directors and as provided in the Omnibus Agreement, the Restricted Business Contribution Agreement, and our partnership agreement. For the year ended December 31, 2012, there were no transactions where such guidelines were not followed.

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Item 14. Principal Accounting Fees and Services

The Audit Committee of the Board of Directors of GP Natural Resource Partners LLC recommended and we engaged Ernst & Young LLP to audit our accounts and assist with tax work for fiscal 2012 and 2011. All of our audit, audit-related fees and tax services have been approved by the Audit Committee of our Board of Directors. The following table presents fees for professional services rendered by Ernst &Young LLP:

	2012		2011
Audit Fees (1)	$	495,169	$	507,120
Audit-Related Fees		—		—
Tax Fees (2)		580,529		522,972
All Other Fees (3)		1,900		1,995

(1) Audit fees include fees associated with the annual audit of our consolidated financial statements, audit of a subsidiary and reviews of our quarterly financial statement for inclusion in our Form 10-Q and comfort letters; consents; assistance with and review of documents filed with the SEC

(2) Tax fees include fees principally incurred for assistance with tax planning, compliance, tax return preparation and filing of Schedules K-1.

(3) All other fees include the subscription to EY Online research tool.

Audit and Non-Audit Services Pre-Approval Policy

I.    Statement of Principles

Under the Sarbanes-Oxley Act of 2002 (the “Act”), the Audit Committee of the Board of Directors is responsible for the appointment, compensation and oversight of the work of the independent auditor. As part of this responsibility, the Audit Committee is required to pre-approve the audit and non-audit services performed by the independent auditor in order to assure that they do not impair the auditor’s independence from the Partnership. To implement these provisions of the Act, the SEC has issued rules specifying the types of services that an independent auditor may not provide to its audit client, as well as the audit committee’s administration of the engagement of the independent auditor. Accordingly, the Audit Committee has adopted, and the Board of Directors has ratified, this Audit and Non-Audit Services Pre-Approval Policy (the “Policy”), which sets forth the procedures and the conditions pursuant to which services proposed to be performed by the independent auditor may be pre-approved.

The SEC’s rules establish two different approaches to pre-approving services, which the SEC considers to be equally valid. Proposed services may either be pre-approved without consideration of specific case-by-case services by the Audit Committee (“general pre-approval”) or require the specific pre-approval of the Audit Committee (“specific pre-approval”). The Audit Committee believes that the combination of these two approaches in this Policy will result in an effective and efficient procedure to pre-approve services performed by the independent auditor. As set forth in this Policy, unless a type of service has received general pre-approval, it will require specific pre-approval by the Audit Committee if it is to be provided by the independent auditor. Any proposed services exceeding pre-approved cost levels or budgeted amounts will also require specific pre-approval by the Audit Committee.

For both types of pre-approval, the Audit Committee will consider whether such services are consistent with the SEC’s rules on auditor independence. The Audit Committee will also consider whether the independent auditor is best positioned to provide the most effective and efficient service for reasons such as its familiarity with our business, employees, culture, accounting systems, risk profile and other factors, and whether the service might enhance the Partnership’s ability to manage or control risk or improve audit quality. All such factors will be considered as a whole, and no one factor will necessarily be determinative.

The Audit Committee is also mindful of the relationship between fees for audit and non-audit services in deciding whether to pre-approve any such services and may determine, for each fiscal year, the appropriate ratio between the total amount of fees for audit, audit-related and tax services.

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The appendices to this Policy describe the audit, audit-related and tax services that have the general pre-approval of the Audit Committee. The term of any general pre-approval is 12 months from the date of pre-approval, unless the Audit Committee considers a different period and states otherwise. The Audit Committee will annually review and pre-approve the services that may be provided by the independent auditor without obtaining specific pre-approval from the Audit Committee. The Audit Committee will add or subtract to the list of general pre-approved services from time to time, based on subsequent determinations.

The purpose of this Policy is to set forth the procedures by which the Audit Committee intends to fulfill its responsibilities. It does not delegate the Audit Committee’s responsibilities to pre-approve services performed by the independent auditor to management.

Ernst & Young LLP, our independent auditor has reviewed this Policy and believes that implementation of the policy will not adversely affect its independence.

II.    Delegation

As provided in the Act and the SEC’s rules, the Audit Committee has delegated either type of pre-approval authority to Robert B. Karn III, the Chairman of the Audit Committee. Mr. Karn must report, for informational purposes only, any pre-approval decisions to the Audit Committee at its next scheduled meeting.

III. Audit Services

The annual Audit services engagement terms and fees will be subject to the specific pre-approval of the Audit Committee. Audit services include the annual financial statement audit (including required quarterly reviews), subsidiary audits and other procedures required to be performed by the independent auditor to be able to form an opinion on the Partnership’s consolidated financial statements. These other procedures include information systems and procedural reviews and testing performed in order to understand and place reliance on the systems of internal control, and consultations relating to the audit or quarterly review. Audit services also include the attestation engagement for the independent auditor’s report on management’s report on internal controls for financial reporting. The Audit Committee monitors the audit services engagement as necessary, but not less than on a quarterly basis, and approves, if necessary, any changes in terms, conditions and fees resulting from changes in audit scope, partnership structure or other items.

In addition to the annual audit services engagement approved by the Audit Committee, the Audit Committee may grant general pre-approval to other audit services, which are those services that only the independent auditor reasonably can provide. Other audit services may include statutory audits or financial audits for our subsidiaries or our affiliates and services associated with SEC registration statements, periodic reports and other documents filed with the SEC or other documents issued in connection with securities offerings.

IV. Audit-related Services

Audit-related services are assurance and related services that are reasonably related to the performance of the audit or review of the Partnership’s financial statements or that are traditionally performed by the independent auditor. Because the Audit Committee believes that the provision of audit-related services does not impair the independence of the auditor and is consistent with the SEC’s rules on auditor independence, the Audit Committee may grant general pre-approval to audit-related services. Audit-related services include, among others, due diligence services pertaining to potential business acquisitions/dispositions; accounting consultations related to accounting, financial reporting or disclosure matters not classified as “Audit Services”; assistance with understanding and implementing new accounting and financial reporting guidance from rulemaking authorities; financial audits of employee benefit plans; agreed-upon or expanded audit procedures related to accounting and/or billing records required to respond to or comply with financial, accounting or regulatory reporting matters; and assistance with internal control reporting requirements.

V. Tax Services

The Audit Committee believes that the independent auditor can provide tax services to the Partnership such as tax compliance, tax planning and tax advice without impairing the auditor’s independence, and the SEC has stated that the independent auditor may provide such services. Hence, the Audit Committee believes it may grant

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general pre-approval to those tax services that have historically been provided by the auditor, that the Audit Committee has reviewed and believes would not impair the independence of the auditor and that are consistent with the SEC’s rules on auditor independence. The Audit Committee will not permit the retention of the independent auditor in connection with a transaction initially recommended by the independent auditor, the sole business purpose of which may be tax avoidance and the tax treatment of which may not be supported in the Internal Revenue Code and related regulations. The Audit Committee will consult with the Chief Financial Officer or outside counsel to determine that the tax planning and reporting positions are consistent with this Policy.

VI. Pre-Approval Fee Levels or Budgeted Amounts

Pre-approval fee levels or budgeted amounts for all services to be provided by the independent auditor will be established annually by the Audit Committee. Any proposed services exceeding these levels or amounts will require specific pre-approval by the Audit Committee. The Audit Committee is mindful of the overall relationship of fees for audit and non-audit services in determining whether to pre-approve any such services. For each fiscal year, the Audit Committee may determine the appropriate ratio between the total amount of fees for audit, audit-related and tax services.

VII. Procedures

All requests or applications for services to be provided by the independent auditor that do not require specific approval by the Audit Committee will be submitted to the Chief Financial Officer and must include a detailed description of the services to be rendered. The Chief Financial Officer will determine whether such services are included within the list of services that have received the general pre-approval of the Audit Committee. The Audit Committee will be informed on a timely basis of any such services rendered by the independent auditor.

Requests or applications to provide services that require specific approval by the Audit Committee will be submitted to the Audit Committee by both the independent auditor and the Chief Financial Officer, and must include a joint statement as to whether, in their view, the request or application is consistent with the SEC’s rules on auditor independence.

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PART IV

Item 15. Exhibits and Financial Statement Schedules

(a)(1) and (2) Financial Statements and Schedules

Please See Item 8, “Financial Statements and Supplementary Data”

(a)(3) Exhibits

Exhibit Number		Description
2.1	—	Purchase Agreement, dated as of January 23, 2013, by and among Anadarko Holding Company, Big Island Trona Company, NRP Trona LLC and NRP (Operating) LLC (incorporated by reference to Exhibit 2.1 to the Current Report on Form 8-K filed on January 25, 2013).
3.1	—	Fourth Amended and Restated Agreement of Limited Partnership of Natural Resource Partners L.P., dated as of September 20, 2010 (incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K filed on September 21, 2010).
3.2	—	Fifth Amended and Restated Agreement of Limited Partnership of NRP (GP) LP, dated as of December 16, 2011 (incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K filed on December 16, 2011).
3.3	—	Fourth Amended and Restated Limited Liability Company Agreement of GP Natural Resource Partners LLC, dated as of January 4, 2007 (incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K filed on January 4, 2007).
3.4	—	Amended and Restated Limited Liability Company Agreement of NRP (Operating) LLC, dated as of October 17, 2002 (incorporated by reference to Exhibit 3.4 of the Annual Report on Form 10-K for the year ended December 31, 2002, File No. 001-31465).
4.1	—	Note Purchase Agreement dated as of June 19, 2003 among NRP (Operating) LLC and the Purchasers signatory thereto (incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K filed June 23, 2003).
4.2	—	First Amendment, dated as of July 19, 2005, to Note Purchase Agreement dated as of June 19, 2003 among NRP (Operating) LLC and the purchasers signatory thereto (incorporated by reference to Exhibit 4.2 to the Current Report on Form 8-K filed on July 20, 2005).
4.3	—	Second Amendment, dated as of March 28, 2007, to Note Purchase Agreement dated as of June 19, 2003 among NRP (Operating) LLC and the purchasers signatory thereto (incorporated by reference to Exhibit 4.2 to the Current Report on Form 8-K filed on March 29, 2007).
4.4	—	First Supplement to Note Purchase Agreement, dated as of July 19, 2005 among NRP (Operating) LLC and the purchasers signatory thereto (incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K filed on July 20, 2005).
4.5	—	Second Supplement to Note Purchase Agreement, dated as of March 28, 2007 among NRP (Operating) LLC and the purchasers signatory thereto (incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K filed on March 29, 2007).
4.6	—	Third Supplement to Note Purchase Agreement, dated as of March 25, 2009 among NRP (Operating) LLC and the purchasers signatory thereto (incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K filed on March 26, 2009).
4.7	—	Fourth Supplement to Note Purchase Agreement, dated as of April 20, 2011 among NRP (Operating) LLC and the purchasers signatory thereto (incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K filed on April 21, 2011).

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Exhibit Number		Description
4.8	—	Subsidiary Guarantee of Senior Notes of NRP (Operating) LLC, dated June 19, 2003 (incorporated by reference to Exhibit 4.5 to the Current Report on Form 8-K filed June 23, 2003).
4.9	—	Form of Series A Note (incorporated by reference to Exhibit 4.2 to the Current Report on Form 8-K filed June 23, 2003).
4.10	—	Form of Series B Note (incorporated by reference to Exhibit 4.3 to the Current Report on Form 8-K filed June 23, 2003).
4.11	—	Form of Series C Note (incorporated by reference to Exhibit 4.4 to the Current Report on Form 8-K filed June 23, 2003).
4.12	—	Form of Series D Note (incorporated by reference to Exhibit 4.12 to the Annual Report on Form 10-K filed February 28, 2007).
4.13	—	Form of Series E Note (incorporated by reference to Exhibit 4.3 to the Current Report on Form 8-K filed March 29, 2007).
4.14	—	Form of Series F Note (incorporated by reference to Exhibit 4.2 to the Quarterly Report on Form 10-Q filed May 7, 2009).
4.15	—	Form of Series G Note (incorporated by reference to Exhibit 4.3 to the Quarterly Report on Form 10-Q filed May 7, 2009).
4.16	—	Form of Series H Note (incorporated by reference to Exhibit 4.2 to the Quarterly Report on Form 10-Q filed May 5, 2011).
4.17	—	Form of Series I Note (incorporated by reference to Exhibit 4.3 to the Quarterly Report on Form 10-Q filed May 5, 2011).
4.18	—	Form of Series J Note (incorporated by reference to Exhibit 4.1 to Current Report on Form 8-K filed on June 15, 2011).
4.19	—	Form of Series K Note (incorporated by reference to Exhibit 4.1 to Current Report on Form 8-K filed on October 3, 2011).
4.20		Registration Rights Agreement, dated as of January 23, 2013, by and among Natural Resource Partners L.P. and the Investors named therein (incorporated by reference to Exhibit 4.1 to Current Report on Form 8-K filed on January 25, 2013).
4.21		Amendment No. 1 to Fourth Amended and Restated Agreement of Limited Partnership of Natural Resource Partners L.P., dated March 6, 2012 (incorporated by reference to Exhibit 4.1 to Quarterly Report on Form 10-Q filed on May 4, 2012).
10.1	—	Second Amended and Restated Credit Agreement, dated as of August 10, 2011 (incorporated by reference to Exhibit 10.1 to Current Report on Form 8-K filed on August 11, 2011).
10.2	—	First Amendment to the Second Amended and Restated Credit Agreement, dated as of January 23, 2013 (incorporated by reference to Exhibit 10.3 to Current Report on Form 8-K filed on January 25, 2013).
10.3	—	Contribution Agreement, dated as of September 20, 2010, by and among Natural Resource Partners L.P., NRP (GP) LP, Western Pocahontas Properties Limited Partnership, Great Northern Properties Limited Partnership, New Gauley Coal Corporation and NRP Investment L.P. (incorporated by reference to Exhibit 10.1 to Current Report on Form 8-K filed on September 21, 2010).
10.4**	—	Natural Resource Partners Second Amended and Restated Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed on January 17, 2008).

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Exhibit Number		Description
10.5**	—	Form of Phantom Unit Agreement (incorporated by reference to Exhibit 10.4 to the Annual Report on Form 10-K for the year ended December 31, 2007, File No. 007-31465).
10.6**	—	Natural Resource Partners Annual Incentive Plan (incorporated by reference to Exhibit 10.4 to the Annual Report on Form 10-K for the year ended December 31, 2002, File No. 001-31465).
10.7	—	First Amended and Restated Omnibus Agreement, dated as of April 22, 2009, by and among Western Pocahontas Properties Limited Partnership, Great Northern Properties Limited Partnership, New Gauley Coal Corporation, Robertson Coal Management LLC, GP Natural Resource Partners LLC, NRP (GP) LP, Natural Resource Partners L.P. and NRP (Operating) LLC (incorporated by reference to Exhibit 10.1 to the Quarterly Report on Form 10-Q filed May 7, 2009).
10.8	—	Restricted Business Contribution Agreement, dated January 4, 2007, by and among Christopher Cline, Foresight Reserves LP, Adena Minerals, LLC, GP Natural Resource Partners LLC, NRP (GP) LP, Natural Resource Partners L.P. and NRP (Operating) LLC (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed on January 4, 2007).
10.9	—	Investor Rights Agreement, dated January 4, 2007, by and among NRP (GP) LP, GP Natural Resource Partners LLC, Robertson Coal Management and Adena Minerals, LLC (incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K filed on January 4, 2007).
10.10	—	Purchase and Sale Agreement, dated September 10, 2009, by and among WPP LLC and Colt, LLC (incorporated by reference to Exhibit 2.1 to Current Report on Form 8-K filed on September 11, 2009).
10.11	—	Amendment No. 1 to Purchase and Sale Agreement, dated as of July 29, 2010, by and between WPP LLC and Colt, LLC (incorporated by reference to Exhibit 10.2 to Quarterly Report on Form 10-Q filed August 6, 2010).
10.12	—	Amendment No. 2 to Purchase and Sale Agreement, dated as of October 4, 2010, by and between WPP LLC and Colt, LLC (incorporated by reference to Exhibit 10.1 to Current Report on Form 8-K filed October 5, 2010).
10.13	—	Waiver Agreement, dated November 12, 2009, by and among Natural Resource Partners L.P., Great Northern Properties Limited Partnership, Western Pocahontas Properties Limited Partnership, New Gauley Coal Corporation, Robertson Coal Management LLC, GP Natural Resource Partners LLC, NRP (GP) LP, and NRP (Operating) LLC (incorporated by reference to Exhibit 10.1 to Current Report on Form 8-K filed on November 13, 2009).
10.14	—	Common Unit Purchase Agreement, dated January 23, 2013, by and among Natural Resource Partners, L.P. and the purchasers named therein (incorporated by reference to Exhibit 10.1 to Current Report on Form 8-K filed on January 25, 2013).
10.15	—	Term Loan Agreement, dated as of January 23, 2013, by and among Natural Resource Partners, L.P., Citibank, N.A., as administrative agent, Citigroup Global Markets, Inc., Wells Fargo Securities, LLC and Compass Bank, as joint lead arrangers and joint bookrunners and Wells Fargo Bank, National Association and Compass Bank, as co-syndication agents (incorporated by reference to Exhibit 10.2 to Current Report on Form 8-K filed on January 25, 2013).
21.1*	—	List of subsidiaries of Natural Resource Partners L.P.
23.1*	—	Consent of Ernst & Young LLP.
31.1*	—	Certification of Chief Executive Officer pursuant to Section 302 of Sarbanes-Oxley.
31.2*	—	Certification of Chief Financial Officer pursuant to Section 302 of Sarbanes-Oxley.

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Exhibit Number		Description
32.1*	—	Certification of Chief Executive Officer pursuant to 18 U.S.C. § 1350.
32.2*	—	Certification of Chief Financial Officer pursuant to 18 U.S.C. § 1350.
99.1	—	Description of certain provisions of the Fourth Amended and Restated Agreement of Limited Partnership of Natural Resource Partners L.P. (incorporated by reference to Exhibit 99.1 to Current Report on Form 8-K filed on September 21, 2010).
101*	—	The following financial information from the annual report on Form 10-K of Natural Resource Partners L.P. for the year ended December 31, 2012, formatted in XBRL (eXtensible Business Reporting Language): (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Comprehensive Income, (iii) Consolidated Statements of Cash Flows, and (iv) Notes to Consolidated Financial Statements, tagged as blocks of text.

* Submitted herewith

** Management compensatory plan or arrangement

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

NATURAL RESOURCE PARTNERS L.P.

By: NRP (GP) LP, its general partner

By: GP NATURAL RESOURCE

       PARTNERS LLC, its general partner

Date: February 28, 2013

By:	/s/    CORBIN J. ROBERTSON, JR.,
	Corbin J. Robertson, Jr., Chairman of the Board and Chief Executive Officer (Principal Executive Officer)

Date: February 28, 2013

By:	/s/    DWIGHT L. DUNLAP
	Dwight L. Dunlap, Chief Financial Officer and Treasurer (Principal Financial Officer)

Date: February 28, 2013

By:	/s/    KENNETH HUDSON
	Kenneth Hudson Controller (Principal Accounting Officer)

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Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

Date: February 28, 2013

/s/    ROBERT T. BLAKELY      

Robert T. Blakely

Director

Date: February 28, 2013

/s/    DAVID M. CARMICHAEL      

David M. Carmichael

Director

Date: February 28, 2013

/s/    J. MATTHEW FIFIELD      

J. Matthew Fifield

Director

Date: February 28, 2013

/s/    ROBERT B. KARN III      

Robert B. Karn III

Director

Date: February 28, 2013

/s/    S. REED MORIAN      

S. Reed Morian

Director

Date: February 28, 2013

/s/    W.W. SCOTT, JR.      

W.W. Scott, Jr.

Director

Date: February 28, 2013

/s/    STEPHEN P. SMITH      

Stephen P. Smith

Director

Date: February 28, 2013

/s/    LEO A. VECELLIO, JR.      

Leo A. Vecellio, Jr.

Director

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EX-21.1

Exhibit 21.1

List of Subsidiaries of Natural Resource Partners L.P.

NRP (Operating) LLC

WPP LLC

ACIN LLC

WBRD LLC

Hod LLC

Shepard Boone Coal Company LLC

Gatling Mineral, LLC

Independence Land Company, LLC

Williamson Transport, LLC

Little River Transport, LLC

Rivervista Mining, LLC

Deepwater Transportation, LLC

NRP Trona LLC

BRP LLC (51% interest)

CoVal Leasing Company, LLC (51% interest)

EX-23.1

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statements (Form S-3 No 333-180907 and Form S-3 No 333-183314) of Natural Resource Partners L.P. of our reports dated February 28, 2013, with respect to the consolidated financial statements of Natural Resource Partners L.P. and the effectiveness of internal control over financial reporting of Natural Resource Partners L.P., included in this Annual Report (Form 10-K) for the year ended December 31, 2012.

/s/ Ernst & Young LLP

Houston, Texas

February 28, 2013

EX-31.1

Exhibit 31.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

I, Corbin J. Robertson, Jr., certify that:

1)  I have reviewed this report on Form 10-K of Natural Resource Partners L.P.

2)  Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)  Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)  The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.  Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.  Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.  Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)  The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions);

a.  All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.  Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

By:	/s/    Corbin J. Robertson, Jr.
	Corbin J. Robertson, Jr.
	Chief Executive Officer

Date: February 28, 2013

EX-31.2

Exhibit 31.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

I, Dwight L. Dunlap, certify that:

1)   I have reviewed this report on Form 10-K of Natural Resource Partners L.P.

2)   Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)   Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)   The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.   Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.   Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.   Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.   Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)   The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions);

a.   All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.   Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

By:	/s/  Dwight L. Dunlap
	Dwight L. Dunlap
	Chief Financial Officer and Treasurer

Date: February 28, 2013

EX-32.1

Exhibit 32.1

CERTIFICATION OF

CHIEF EXECUTIVE OFFICER

OF GP NATURAL RESOURCE PARTNERS LLC

PURSUANT TO 18 U.S.C. § 1350

In connection with the accompanying report on Form 10-K for the year ended December 31, 2012 filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Corbin J. Robertson, Jr., Chief Executive Officer and Chairman of the Board of GP Natural Resource Partners LLC, the general partner of the general partner of Natural Resource Partners L.P. (the “Company”), hereby certify, to my knowledge, that:

1.  The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.  The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/    Corbin J. Robertson, Jr.

Name:    Corbin J. Robertson, Jr.

Date: February 28, 2013

EX-32.2

Exhibit 32.2

CERTIFICATION OF

CHIEF FINANCIAL OFFICER

OF GP NATURAL RESOURCE PARTNERS LLC

PURSUANT TO 18 U.S.C. § 1350

In connection with the accompanying report on Form 10-K for the year ended December 31, 2012 filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dwight L. Dunlap, Chief Financial Officer and Treasurer of GP Natural Resource Partners LLC, the general partner of the general partner of Natural Resource Partners L.P. (the “Company”), hereby certify, to my knowledge, that:

1.  The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.  The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/    Dwight L. Dunlap

Name: Dwight L. Dunlap

Date: February 28, 2013

XML

Asset Impairments - Additional Information (Detail) (USD $)	3 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Asset impairment charges	$ 2,600,000	$ 70,400,000	$ 90,900,000	$ 2,568,000	$ 161,336,000
Gatling LLC Ohio [Member]
Related Party Transaction [Line Items]
Asset impairment charges					70,400,000
Recoupable minimum royalty balance					9,600,000
West Virginia [Member]
Related Party Transaction [Line Items]
Non-recoupable minimum royalty payments					3,400,000
Non-recoupable minimum royalty balance					24,100,000
Asset impairment charges				2,600,000	118,400,000
Net impairment					$ 90,900,000

XML

Major Lessees - Revenues from Lessees that Exceeded Ten Percent of Total Revenues (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
The Cline Group [Member]
Operating Leased Assets [Line Items]
Revenues	$ 92,341	$ 67,819	$ 62,372
Percent	24.40%	18.00%	20.70%
Alpha Natural Resources [Member]
Operating Leased Assets [Line Items]
Revenues	$ 81,077	$ 107,267	$ 79,084
Percent	21.40%	28.40%	26.20%

XML

Long-Term Debt - Principal Payments Due (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Debt Instrument [Line Items]
2013	$ 87,230
2014	80,983
2015	80,983
2016	228,983
2017	80,983
Thereafter	425,107
Principal Payments	984,269
Senior Notes [Member]
Debt Instrument [Line Items]
2013	87,230
2014	80,983
2015	80,983
2016	80,983
2017	80,983
Thereafter	425,107
Principal Payments	836,269
Credit Facility [Member]
Debt Instrument [Line Items]
2016	148,000
Principal Payments	$ 148,000

XML

Major Lessees - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Leased Assets [Line Items]
Minimum Percentage of revenue derived from major two leases	45.80%
Total revenue attributable	53.00%
The Cline Group [Member]
Operating Leased Assets [Line Items]
Percentage of revenue derived from major lessee	12.40%	11.70%	11.50%

XML

Long Term Debt - Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Proforma Debt Instrument [Line Items]
Total debt	$ 984,269	$ 867,069
Less - current portion of long term debt	(87,230)	(30,801)
Long-term debt	897,039	836,268
$300 million floating rate revolving credit facility, due August 2016 [Member]
Proforma Debt Instrument [Line Items]
Total debt	148,000
5.55% senior notes, with semi-annual interest payments in June and December, maturing June 2013 [Member]
Proforma Debt Instrument [Line Items]
Total debt	35,000	35,000
4.91% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, maturing in June 2018 [Member]
Proforma Debt Instrument [Line Items]
Total debt	27,700	32,317
8.38% senior notes, with semi-annual interest payments in March and September, with scheduled principal payments beginning March 2013, maturing in March 2019 [Member]
Proforma Debt Instrument [Line Items]
Total debt	150,000	150,000
5.05% senior notes, with semi-annual interest payments in January and July, with annual principal payments in July, maturing in July 2020 [Member]
Proforma Debt Instrument [Line Items]
Total debt	61,538	69,230
5.31% utility local improvement obligation, with annual principal and interest payments, maturing in March 2021[Member]
Proforma Debt Instrument [Line Items]
Total debt	1,731	1,922
5.55% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, maturing in June 2023 [Member]
Proforma Debt Instrument [Line Items]
Total debt	30,300	33,600
4.73% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2023 [Member]
Proforma Debt Instrument [Line Items]
Total debt	75,000	75,000
5.82% senior notes, with semi-annual interest payments in March and September, with annual principal payments in March, maturing in March 2024 [Member]
Proforma Debt Instrument [Line Items]
Total debt	180,000	195,000
8.92% senior notes, with semi-annual interest payments in March and September, with scheduled principal payments beginning March 2014, maturing in March 2024 [Member]
Proforma Debt Instrument [Line Items]
Total debt	50,000	50,000
5.03% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2026 [Member]
Proforma Debt Instrument [Line Items]
Total debt	175,000	175,000
5.18% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2026 [Member]
Proforma Debt Instrument [Line Items]
Total debt	$ 50,000	$ 50,000

XML

Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Activity in Outstanding Grants

A summary of activity in the outstanding grants for the year ended December 31, 2012 are as follows:

Outstanding grants at the beginning of the period	870,344
Grants during the period	272,150
Grants vested and paid during the period	(189,736	)
Forfeitures during the period	(40,444	)
Outstanding grants at the end of the period	912,314

XML

Incentive Plans - Summary of Activity in Outstanding Grants (Detail)	12 Months Ended
	Dec. 31, 2012
Unit Based Compensation Arrangement [Line Items]
Outstanding grants at the beginning of the period	870,344
Grants during the period	272,150
Grants vested and paid during the period	(189,736)
Forfeitures during the period	(40,444)
Outstanding grants at the end of the period	912,314

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Asset Impairments (Tables)

12 Months Ended

Dec. 31, 2012

Net Book Value and Fair Values of Assets

The net book value and calculated fair values of the assets relating to the Gatling West Virginia operation were as follows:

	2012 Measurement Date				2011 Measurement Date
	Fair Value		Net Book Value		Fair Value		Net Book Value
	(In thousands)
Coal and other mineral rights, net	$	4,050	$	6,618	$	6,618	$	76,003
Intangible assets, net		—		—		—		43,855
Plant and equipment, net		1,981		1,981		2,600		7,775
Total	$	6,031	$	8,599	$	9,218	$	127,633

The net book value as of the measurement date and calculated fair values of the assets relating to the Gatling Ohio operation are as follows:

	2011 Measurement Date
	Fair Value		Net Book Value
	(In thousands)
Coal and other mineral rights, net	$	20,035	$	56,769
Intangible assets, net		—		33,670
Plant and equipment, net		2,947		2,947
Total	$	22,982	$	93,386

XML

Fair Value - Contractual Override and Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Fair Value of Sugar Camp override, current and long-term	$ 8,817
Fair Value of Taggart plant sale, current and long-term	1,668
Fair Value of Long-term debt, current and long-term	876,574	915,959
Carrying Value of Sugar Camp override, current and long-term	7,495
Carrying Value of Taggart plant receivable, current and long-term	1,667
Carrying Value of Long-term debt, current and long-term	$ 836,269	$ 867,069

XML

Plant and Equipment - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Aug. 31, 2011	May 31, 2011
Long Lived Assets Held-for-sale [Line Items]
Note receivable balance	$ 1,667,000	$ 1,667,000
Net Book Value of the asset sold	32,401,000	32,401,000	46,185,000
Deposit non refundable					1,000,000
Remaining amount paid to complete purchase				4,500,000
Gain on sale of plant and equipment	1,100,000	13,575,000	1,058,000
Taggart Global USA, LLC [Member]
Long Lived Assets Held-for-sale [Line Items]
Partnership sold preparation plant		12,300,000
Partnership received		10,500,000
Note receivable balance	1,700,000	1,700,000
Gain recorded on partnership		4,700,000
Net Book Value of the asset sold	$ 7,600,000	$ 7,600,000

XML

Significant Acquisitions - Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended					6 Months Ended	12 Months Ended					12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012 acre	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Colt [Member]	Sep. 30, 2009 Colt [Member] T	Jun. 30, 2012 Northern Oklahoma [Member] acre	Dec. 31, 2012 Northern Oklahoma [Member]	Dec. 31, 2012 Brp Llc [Member]	Dec. 31, 2011 Brp Llc [Member]	Dec. 31, 2010 Brp Llc [Member]	Jun. 30, 2010 Brp Llc [Member]	Dec. 31, 2012 Marcellus Override [Member] acre	Dec. 31, 2012 Sugar Camp [Member]	Dec. 31, 2012 Ruger Llc [Member]
Business Acquisition [Line Items]
Land acquired									15,600					19,200						88,000
Cost of partnership acquisition														$ 63,900,000	$ 51,300,000					$ 30,300,000
Coal reserve agreed to acquire under partnership agreement													200,000,000
Purchase Price													255,000,000						42,500,000		50,000,000
Amount paid at closing												80,000,000
Quarterly minimum payments																					1,250,000
Lease period																					The lease is for a term of 20 years but may be extended by the lessee
Total projected payments																					96,200,000
Unearned income																					46,700,000
Net amount receivable under the lease																					49,600,000	7,600,000
Net amount receivable under the lease included in accounts receivable - affiliates																					1,500,000
Transportation cost of equipment																					3,600,000
Contractual overriding royalty interest																						8,900,000
Amount expected to be received over the next twelve months																						1,100,000
Contractual overriding royalty interest recognized																						1,100,000
Percentage of income interest as a result of acquisition																			51.00%
Percentage of minority voting interest of IPC																			49.00%
Net income	60,107,000	52,001,000	49,938,000	51,309,000	(16,903,000)	(30,559,000)	56,206,000	45,282,000	213,355,000	54,026,000	154,461,000					1,700,000	5,200,000	2,300,000
Cash distributions																$ 11,400,000	$ 2,500,000

XML

Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2012 PartnershipUnit	Dec. 31, 2011 T
Related Party Transaction [Line Items]
Lease expenses				$ 600,000
Accounts receivable from related party	10,613,000	10,138,000		10,613,000	10,138,000
Unrecouped minimum royalty payments				56,600,000
Proceeds from royalty payments in current year				27,700,000
Asset impairment	2,600,000	70,400,000	90,900,000	2,568,000	161,336,000
Gain on partnership					3,000,000
Reserve exchange					1,000,000
Membership interest description				Right to nominate two members of Taggart's 5-person board of directors
Number of companies acquired				4
Cline Affiliates [Member]
Related Party Transaction [Line Items]
Rate of interest in the partnerships general partner				31.00%
Related party transaction number of units hold by the related party in partnerships' general partner				12,617,673
Accounts receivable from related party	6,600,000			6,600,000
Amount of overriding royalty and lease of loadout facility	57.1			57.1
Asset impairment	2,600,000	70,400,000	90,900,000
Taggart Global USA, LLC [Member]
Related Party Transaction [Line Items]
Accounts receivable from related party	500,000			500,000
Cost of Acquisition	46,600,000			46,600,000
Preparation plant sale value				12,300,000
Cash received on sale of preparation plant				10,500,000
Note receivable balance				1,700,000
Gain on sale of preparation plant				4,700,000
Net book value of the asset	7,600,000			7,600,000
Kopper-Glo [Member]
Related Party Transaction [Line Items]
Accounts receivable from related party	$ 300,000			$ 300,000

XML

Long Term Debt - Long-Term Debt (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Aug. 10, 2011	Dec. 31, 2012 $300 million floating rate revolving credit facility, due August 2016 [Member]	Dec. 31, 2012 5.55% senior notes, with semi-annual interest payments in June and December, maturing June 2013 [Member]	Dec. 31, 2012 4.91% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, maturing in June 2018 [Member]	Dec. 31, 2012 8.38% senior notes, with semi-annual interest payments in March and September, with scheduled principal payments beginning March 2013, maturing in March 2019 [Member]	Dec. 31, 2012 5.05% senior notes, with semi-annual interest payments in January and July, with annual principal payments in July, maturing in July 2020 [Member]	Dec. 31, 2012 5.31% utility local improvement obligation, with annual principal and interest payments, maturing in March 2021[Member]	Dec. 31, 2012 5.55% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, maturing in June 2023 [Member]	Dec. 31, 2012 4.73% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2023 [Member]	Dec. 31, 2012 5.82% senior notes, with semi-annual interest payments in March and September, with annual principal payments in March, maturing in March 2024 [Member]	Dec. 31, 2012 8.92% senior notes, with semi-annual interest payments in March and September, with scheduled principal payments beginning March 2014, maturing in March 2024 [Member]	Dec. 31, 2012 5.03% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2026 [Member]	Dec. 31, 2012 5.18% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2026 [Member]
Proforma Debt Instrument [Line Items]
Floating rate revolving credit facility	$ 300	$ 300
Rate of Senior Notes due			5.55%	4.91%	8.38%	5.05%	5.31%	5.55%	4.73%	5.82%	8.92%	5.03%	5.18%

XML

Significant acquisitions

12 Months Ended

Dec. 31, 2012

Significant acquisitions

3.    Significant acquisitions

Marcellus Override.    In December 2012, the Partnership acquired an overriding royalty interest on approximately 88,000 net acres of overriding royalty interests in oil and gas reserves located in the Marcellus Shale for $30.3 million.

Colt.    In September 2009, the Partnership signed a definitive agreement to acquire approximately 200 million tons of coal reserves related to the Deer Run Mine in Illinois from Colt, LLC, an affiliate of the Cline Group, through several separate transactions for a total purchase price of $255 million. During the year ended December 31, 2012, the Partnership paid $80.0 million to complete the acquisition of reserves at this mine.

Oklahoma Oil and Gas.    From December 2011 through June 2012, the Partnership acquired approximately 19,200 net mineral acres located in the Mississippian Lime oil play in Northern Oklahoma for approximately $63.9 million, of which 15,600 net mineral acres were acquired during 2012 for $51.3 million.

Sugar Camp.    In March 2012, the Partnership acquired from Sugar Camp Energy, an affiliate of the Cline Group, the rail loadout and associated infrastructure assets at the Sugar Camp mine in Illinois for total consideration of $50.0 million. At the time of the acquisition, the Partnership also entered into a lease agreement related to the rail loadout and associated facilities that has been accounted for as a direct financing lease. The lease provides for payments based upon tons of coal transported over the facilities subject to quarterly recoupable minimum payments of $1.25 million. The lease is for a term of 20 years but may be extended by the lessee. Total projected remaining payments under the lease at December 31, 2012 are $96.2 million with unearned income of $46.7 million. The unearned income will be reflected as transportation fees over the term of the lease using the effective interest method. Any amounts in excess of the contractual minimums will be recorded as transportation fees when earned. The net amount receivable under the lease as of December 31, 2012 was $49.6 million, of which $1.5 million is included in accounts receivable – affiliates while the remaining is included in long-term contracts receivable — affiliate. The Partnership recognized $3.6 million in transportation fees during the year ended December 31, 2012 related to this lease.

In a separate transaction, the Partnership acquired, from Ruger, LLC, an affiliate of the Cline Group, a contractual overriding royalty interest for $8.9 million that will provide for payments based upon production from specific tons at the Sugar Camp operations. This overriding royalty was accounted for as a financing arrangement and is reflected as an affiliate receivable. The payments the Partnership receives with respect to the overriding royalty will be reflected partially as a return of the initial investment and partially as override revenue over the life of the contract using the effective interest method based upon actual production and adjusted periodically for differences in projected and actual production. The net amount receivable under the agreement as of December 31, 2012 was $7.6 million of which $1.1 million is included in accounts receivable — affiliates while the remaining is included in long-term contracts receivable — affiliate. The Partnership recognized $1.1 million in overriding royalty during the year ended December 31, 2012 related to the contractual overriding royalty interest.

BRP LLC.    In June 2010, the Partnership and International Paper Company (“IPC”) formed BRP to own and manage mineral assets previously owned by IPC. Some of these assets are currently subject to leases, and certain other assets are available for future development by the venture. In exchange for a $42.5 million contribution, NRP became the controlling member with the right to designate two of the three managers of BRP. NRP has a 51% income interest plus a preferential cumulative annual distribution prior to profit sharing. In exchange for the contribution of the producing properties and the properties not currently producing, IPC received $42.5 million in cash, a minority voting interest and a 49% income interest after the preferential cumulative annual distribution. The amount of the preference is fixed throughout the life of the venture but can be reduced by a portion of the proceeds received from sales of producing properties included in the initial acquisition. Identified tangible assets included in the transaction are oil and gas, coal, and aggregate reserves, as well as the rights to other unidentified minerals which may include coal bed methane, geothermal, CO2 sequestration, water rights, precious metals, industrial minerals and base metals. Certain properties, including oil and gas, coal and aggregates, as well as land leased for cell towers, are currently under lease and generating revenues.

Operations of the venture are included from June 1, 2010, the effective date of acquisition. Total net income from startup through December 31, 2010 was $2.3 million and for the years ended December 31, 2011 and 2012 were $5.2 million and $1.7 million, respectively. The venture operating agreement provides that net income of the venture only be allocated to the non-controlling interests after the preferential cumulative annual distribution. The Partnership began receiving cash distributions in 2011. Distributions received totaled $2.5 million and $11.4 million for the years ended December 31, 2011 and 2012, respectively.

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Mineral Rights - Mineral Rights (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amortization Expense By Geographic Segment [Line Items]
Mineral rights	$ 1,815,424	$ 1,645,451
Less accumulated depletion and amortization	(434,996)	(387,950)
Net book value	1,380,428	1,257,501
Total depletion and amortization expense on mineral interests	$ 47,042	$ 47,230	$ 38,501

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Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2012

Long-Term Debt

Long-term debt consists of the following:

	December 31, 2012			December 31, 2011
	(In thousands)
$300 million floating rate revolving credit facility, due August 2016	$	148,000		$	—
5.55% senior notes, with semi-annual interest payments in June and December, maturing June 2013		35,000			35,000
4.91% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, maturing in June 2018		27,700			32,317
8.38% senior notes, with semi-annual interest payments in March and September, with scheduled principal payments beginning March 2013, maturing in March 2019		150,000			150,000
5.05% senior notes, with semi-annual interest payments in January and July, with annual principal payments in July, maturing in July 2020		61,538			69,230
5.31% utility local improvement obligation, with annual principal and interest payments, maturing in March 2021		1,731			1,922
5.55% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, maturing in June 2023		30,300			33,600
4.73% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2023		75,000			75,000
5.82% senior notes, with semi-annual interest payments in March and September, with annual principal payments in March, maturing in March 2024		180,000			195,000
8.92% senior notes, with semi-annual interest payments in March and September, with scheduled principal payments beginning March 2014, maturing in March 2024		50,000			50,000
5.03% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2026		175,000			175,000
5.18% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2026		50,000			50,000
Total debt		984,269			867,069
Less — current portion of long term debt		(87,230	)		(30,801	)
Long-term debt	$	897,039		$	836,268

Principal Payments Due

Principal payments due in:

	Senior Notes		Credit Facility		Total
	(In thousands)
2013	$	87,230	$	—	$	87,230
2014		80,983		—		80,983
2015		80,983		—		80,983
2016		80,983		148,000		228,983
2017		80,983		—		80,983
Thereafter		425,107		—		425,107
	$	836,269	$	148,000	$	984,269

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Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2012

Intangible Assets

Amounts recorded as intangible assets along with the balances and accumulated amortization at December 31, 2012 and 2011 are reflected in the table below:

	December 31, 2012			December 31, 2011
	(In thousands)
Contract intangibles	$	89,420		$	89,420
Less accumulated amortization		(18,609	)		(14,256	)
Net book value	$	70,811		$	75,164

	For the years ended December 31,
	2012		2011		2010
	(In thousands)
Total amortization expense on intangible assets	$	4,354	$	9,298	$	10,150

Estimated Amortization Expense

The estimates of amortization expense for the periods as indicated below are based on current mining plans and are subject to revision as those plans change in future periods.

Estimated amortization expense (In thousands)
For year ended December 31, 2013	$	3,818
For year ended December 31, 2014		3,690
For year ended December 31, 2015		3,830
For year ended December 31, 2016		3,830
For year ended December 31, 2017		3,830

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Incentive Plans - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unit Based Compensation Arrangement [Line Items]
Market value of common units under the incentive plan	Average closing price over the 20 trading days prior to the vesting date
Vesting period of Grants in years	4 years
Partnership's historical distribution rate	7.03%
Expenses related to Incentive Plan to be reimbursed to general partner	$ 2.9	$ 7.4	$ 9.0
Payments made in connection with Long-Term Incentive Plan	6.6	5.7	3.2
Grant date fair value	$ 33.38	$ 42.93	$ 29.42
Unaccrued cost associated with outstanding grants and related DERs	$ 7.7
Minimum [Member]
Unit Based Compensation Arrangement [Line Items]
Risk free interest rate	0.18%
Volatility rate	29.39%
Maximum [Member]
Unit Based Compensation Arrangement [Line Items]
Risk free interest rate	0.35%
Volatility rate	35.157%

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Intangible Assets - Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Intangible Assets [Line Items]
Contract intangibles	$ 89,420	$ 89,420
Less accumulated amortization	(18,609)	(14,256)
Net book value	70,811	75,164
Total amortization expense on intangible assets	$ 4,354	$ 9,298	$ 10,150

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

Contractual Override and Long-Term Debt

The fair market value and carrying value of the contractual override, Taggart note receivable and long-term senior notes are as follows:

	Fair Value As Of				Carrying Value As Of
	December 31, 2012		December 31, 2011		December 31, 2012		December 31, 2011
	(In thousands)
Assets
Sugar Camp override, current and long-term	$	8,817	$	—	$	7,495	$	—
Taggart plant receivable, current and long term	$	1,668	$	—	$	1,667	$	—
Liabilities
Long-term debt, current and long-term	$	876,574	$	915,959	$	836,269	$	867,069

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Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Reimbursements

The reimbursements to affiliates of the Partnership’s general partner for services performed by Western Pocahontas Properties and Quintana Minerals Corporation are as follows:

	For the Years Ended December 31,
	2012		2011		2010
	(In thousands)
Reimbursement for services	$	9,791	$	9,136	$	7,358

Cline Affiliates [Member]

Summary of Revenues from Related Party

Revenues from the Cline affiliates are as follows:

	For The Year Ended December 31,
	2012		2011		2010
	(In thousands)
Coal royalty revenues	$	48,567	$	42,474	$	32,407
Processing fees		2,409		2,975		1,337
Transportation fees		19,514		16,689		14,324
Minimums recognized as revenue		17,785		—		12,400
Override revenue		4,066		2,691		1,904
Other revenue		—		2,990		—
	$	92,341	$	67,819	$	62,372

Taggart Global USA, LLC [Member]

Summary of Revenues from Related Party

Taggart with a total cost of $46.6 million. Revenues from Taggart are as follows:

	For the Years Ended December 31,
	2012		2011		2010
	(In thousands)
Processing revenue	$	5,580	$	9,755	$	5,874

Kopper-Glo [Member]

Summary of Revenues from Related Party

Revenues from Kopper-Glo are as follows:

	For the Years Ended December 31,
	2012		2011		2010
	(In thousands)
Coal royalty revenues	$	3,486	$	1,629	$	1,545

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2012

Summary of Significant Accounting Policies

2.    Summary of Significant Accounting Policies

Principles of Consolidation

The financial statements include the accounts of Natural Resource Partners L.P. and its wholly owned subsidiaries as well as BRP LLC, a venture with International Paper Company controlled by the Partnership. Intercompany transactions and balances have been eliminated.

Business Combinations

For purchase acquisitions accounted for as a business combination, the Partnership is required to record the assets acquired, including identified intangible assets and liabilities assumed at their fair value, which in many instances involves estimates based on third party valuations, such as appraisals, or internal valuations based on discounted cash flow analyses or other valuation techniques.

Use of Estimates

Preparation of the accompanying financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities in the accompanying Consolidated Balance Sheets and the reported amounts of revenues and expenses in the accompanying Consolidated Statements of Comprehensive Income during the reporting period. Actual results could differ from those estimates.

Fair Value

The Partnership discloses certain assets and liabilities using fair value as defined by FASB’s fair value authoritative guidance. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. See “Note 10. Fair Value Measurements”.

FASB’s guidance describes three levels of inputs that may be used to measure fair value:

• Level 1 — Quoted prices in active markets for identical assets or liabilities.

• Level 2 — Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

• Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.

Cash Equivalents and Restricted Cash

The Partnership considers all highly liquid short-term investments with an original maturity of three months or less to be cash equivalents.

Accounts Receivable

Accounts receivable from the Partnership’s lessees do not bear interest. Receivables are recorded net of the allowance for doubtful accounts in the accompanying Consolidated Balance Sheets. The Partnership evaluates the collectability of its accounts receivable based on a combination of factors. The Partnership regularly analyzes its lessees’ accounts and when it becomes aware of a specific customer’s inability to meet its financial obligations to the Partnership, such as in the case of bankruptcy filings or deterioration in the lessee’s operating results or financial position, the Partnership records a specific reserve for bad debt to reduce the related receivable to the amount it reasonably believes is collectible. Accounts are charged off when collection efforts are complete and future recovery is doubtful. If circumstances related to specific lessees change, the Partnership’s estimates of the recoverability of receivables could be further adjusted.

Land and Mineral Rights

Land and mineral rights owned and leased are recorded at cost. Coal and aggregate mineral rights are depleted on a unit-of-production basis by lease, based upon minerals mined in relation to the net cost of the mineral properties and estimated proven and probable tonnage therein, or over the amortization period of the lease. The Partnership leases its oil and gas minerals interests, all of which are located in the U.S., to third-party entities for the exploration and production of oil and natural gas. Proven producing oil and natural gas mineral rights are depleted on a units of production basis. The Partnership is solely a royalty owner and as a result it does not determine whether or when to develop reserves.

Plant and Equipment

Plant and equipment consists of coal preparation plants, related coal handling facilities, and other coal and aggregate processing and transportation infrastructure. Expenditures for new facilities and expenditures that substantially increase the useful life of property, including interest during construction, are capitalized and reported in the Consolidated Statements of Cash Flows. These assets are recorded at cost and are being depreciated on a straight-line basis over their useful lives, which when originally recorded range from three to twenty years.

Intangible Assets

The Partnership’s intangible assets consist of above-market contracts. Intangible assets are identified related to contracts acquired when compared to the estimate of current market rates for similar contracts. The estimated fair value of the above-market rate contracts are determined based on the present value of future cash flow projections related to the underlying assets acquired. Intangible assets are amortized on a unit-of-production basis except that a minimum amortization is calculated on a straight line basis for temporarily idled assets.

Deferred Financing Costs

Deferred financing costs consist of legal and other costs related to the issuance of the Partnership’s revolving credit facility and senior notes. These costs are amortized over the term of the debt.

Asset Impairment

If facts and circumstances suggest that a long-lived asset or an intangible asset may be impaired, the carrying value is reviewed. If this review indicates that the value of the asset will not be recoverable, as determined based on projected undiscounted cash flows related to the asset over its remaining life, then the carrying value of the asset is reduced to its estimated fair value.

Revenues

Coal and Aggregate Royalties.    Coal and aggregate royalty revenues are recognized on the basis of tons of mineral sold by the Partnership’s lessees and the corresponding revenue from those sales. Generally, the lessees make payments to the Partnership based on the greater of a percentage of the gross sales price or a fixed price per ton of mineral they sell.

Processing and Transportation Fees.    Processing fees are recognized on the basis of tons of material processed through the facilities by the Partnership’s lessees and the corresponding revenue from those sales. Generally, the lessees of the processing facilities make payments to the Partnership based on the greater of a percentage of the gross sales price or a fixed price per ton of material that is processed and sold from the facilities. The processing leases are structured in a manner so that the lessees are responsible for operating and maintenance expenses associated with the facilities. Transportation fees are recognized on the basis of tons of material transported over the beltlines. Under the terms of the transportation contracts, the Partnership receives a fixed price per ton for all material transported on the beltlines.

Oil and Gas Royalties.    Oil and gas royalties are recognized on the basis of volume of hydrocarbons sold by lessees and the corresponding revenue from those sales. Generally, the lessees make payments based on a percentage of the selling price. Also, included within oil and gas royalties are lease bonus payments, which are generally paid upon the execution of a lease. Some leases are subject to minimum annual payments or delay rentals.

Minimum Royalties.    Most of the Partnership’s lessees must make minimum annual or quarterly payments which are generally recoupable over certain time periods. These minimum payments are recorded as deferred revenue when received. The deferred revenue attributable to the minimum payment is recognized as royalty revenue when the lessee recoups the minimum payment through production. The deferred revenue is recognized as minimums recognized as revenue in the period immediately following the expiration of the lessee’s ability to recoup the payments.

Lessee Audits and Inspections

The Partnership periodically audits lessee information by examining certain records and internal reports of its lessees. The Partnership’s regional managers also perform periodic mine inspections to verify that the information that has been submitted to it is accurate. The audit and inspection processes are designed to identify material variances from lease terms as well as differences between the information reported to the Partnership and the actual results from each property. Audits and inspections, however, are in periods subsequent to when the revenue is reported and any adjustment identified by these processes might be in a reporting period different from when the revenue was initially recorded. Typically there are no material adjustments from this process.

Property Taxes

The Partnership is responsible for paying property taxes on the properties it owns. Typically, the lessees are contractually responsible for reimbursing the Partnership for property taxes on the leased properties. The reimbursement of property taxes is included in property tax revenue in the Consolidated Statements of Comprehensive Income.

Income Taxes

No provision for income taxes related to the operations of the Partnership has been included in the accompanying financial statements because, as a partnership, it is not subject to federal or material state income taxes and the tax effect of its activities accrues to the unitholders. Net income for financial statement purposes may differ significantly from taxable income reportable to unitholders as a result of differences between the tax bases and financial reporting bases of assets and liabilities. In the event of an examination of the Partnership’s tax return, the tax liability of the partners could be changed if an adjustment in the Partnership’s income is ultimately sustained by the taxing authorities.

Share-Based Payment

The Partnership accounts for awards relating to its Long-Term Incentive Plan using the fair value method, which requires the Partnership to estimate the fair value of the grant, and charge or credit the estimated fair value to expense over the service or vesting period of the grant based on fluctuations in the Partnership’s common unit price. In addition, estimated forfeitures are included in the periodic computation of the fair value of the liability and the fair value is recalculated at each reporting date over the service or vesting period of the grant.

New Accounting Standards

In June 2011, the FASB amended the presentation of comprehensive income. The amendments in this update gave the Partnership the option to present the total comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. The amendments in this update also require the Partnership to present changes in accumulated other comprehensive income by component in the statement of unitholders’ equity or in the notes to the financial statements. The Partnership adopted this amendment on January 1, 2012 and elected to present other comprehensive income in a single continuous statement, Consolidated Statements of Comprehensive Income. The Partnership also elected to present changes in accumulated other comprehensive income in the Consolidated Statements of Partners’ Capital.

In May 2011, the FASB amended fair value measurement and disclosure requirements. The amendments result in common fair value measurement and disclosure requirements in U.S. GAAP and International Financial Reporting Standards (IFRSs). Some of the amendments clarify the FASB’s intent about the application of existing fair value measurement requirements. Other amendments change a particular principal or requirement for measuring fair value or for disclosing information about fair value measurements. The Partnership adopted this amendment on January 1, 2012. The amendment did not have a material impact on its financial position, results of operations, cash flows or notes to the financial statements.

Other accounting standards that have been issued by the FASB or other standards-setting bodies are not expected to have a material impact on the Partnership’s financial position, results of operations and cash flows.

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Major Lessees (Tables)

12 Months Ended

Dec. 31, 2012

Revenues from Lessees that Exceeded Ten Percent of Total Revenues

The Partnership has the following lessees that generated in excess of ten percent of total revenues in any one of the years ended December 31, 2012, 2011, and 2010. Revenues from these lessees are as follows:

	For the Years Ended December 31,
	2012					2011					2010
	Revenues		Percent			Revenues		Percent			Revenues		Percent
	(Dollars in thousands)
The Cline Group	$	92,341		24.4	%	$	67,819		18.0	%	$	62,372		20.7	%
Alpha Natural Resources	$	81,077		21.4	%	$	107,267		28.4	%	$	79,084		26.2	%

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Asset Impairments - Net Book Value and Fair Values of Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Coal and other mineral rights, net book value	$ 1,380,428	$ 1,257,501
Intangible assets, net book value	70,811	75,164
Plant and equipment, net book value	32,401	46,185
West Virginia [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Coal and other mineral rights, net fair value	4,050	6,618
Intangible assets, net fair value
Plant and equipment, net fair value	1,981	2,600
Total, net fair value	6,031	9,218
Coal and other mineral rights, net book value	6,618	76,003
Intangible assets, net book value		43,855
Plant and equipment, net book value	1,981	7,775
Total net book value	8,599	127,633
Gatling LLC Ohio [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Coal and other mineral rights, net fair value		20,035
Intangible assets, net fair value
Plant and equipment, net fair value		2,947
Total, net fair value		22,982
Coal and other mineral rights, net book value		56,769
Intangible assets, net book value		33,670
Plant and equipment, net book value		2,947
Total net book value		$ 93,386

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Related Party Transactions - Summary of Revenues from Related Party (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Coal royalty revenues									$ 260,734	$ 279,221	$ 221,761
Minimums recognized as revenue									23,956	9,148	14,199
Override revenue									15,527	14,523	11,258
Other revenue									20,087	11,237	6,795
Total revenues	102,436	94,175	90,664	91,872	93,135	103,164	96,532	84,852	379,147	377,683	301,401
Taggart Global USA, LLC [Member]
Related Party Transaction [Line Items]
Processing revenue									5,580	9,755	5,874
Kopper-Glo [Member]
Related Party Transaction [Line Items]
Coal royalty revenues									3,486	1,629	1,545
Cline Affiliates [Member]
Related Party Transaction [Line Items]
Coal royalty revenues									48,567	42,474	32,407
Processing fees									2,409	2,975	1,337
Transportation fees									19,514	16,689	14,324
Minimums recognized as revenue									17,785		12,400
Override revenue									4,066	2,691	1,904
Other revenue										2,990
Total revenues									$ 92,341	$ 67,819	$ 62,372

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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 149,424	$ 214,922
Accounts receivable, net of allowance for doubtful accounts	35,116	30,923
Accounts receivable - affiliates	10,613	10,138
Other	1,042	832
Total current assets	196,195	256,815
Land	24,340	24,534
Plant and equipment, net	32,401	46,185
Mineral rights, net	1,380,428	1,257,501
Intangible assets, net	70,811	75,164
Loan financing costs, net	4,291	4,846
Long-term contracts receivable - affiliates	55,576
Other assets	630	604
Total assets	1,764,672	1,665,649
Current liabilities:
Accounts payable and accrued liabilities	3,693	2,366
Accounts payable - affiliates	957	375
Obligation related to acquisition		500
Current portion of long-term debt	87,230	30,801
Accrued incentive plan expenses - current portion	7,718	8,374
Property, franchise and other taxes payable	7,952	6,316
Accrued interest	10,265	10,761
Total current liabilities	117,815	59,493
Deferred revenue	123,506	113,303
Accrued incentive plan expenses	8,865	11,670
Long-term debt	897,039	836,268
Partners' capital:
Common units outstanding: (106,027,836)	605,019	629,253
General partner's interest	10,026	10,517
Non-controlling interest	2,845	5,638
Accumulated other comprehensive loss	(443)	(493)
Total partners' capital	617,447	644,915
Total liabilities and partners' capital	$ 1,764,672	$ 1,665,649

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Intangible Assets - Estimated Amortization Expense (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Amortization Expense [Line Items]
For year ended December 31, 2013	$ 3,818
For year ended December 31, 2014	3,690
For year ended December 31, 2015	3,830
For year ended December 31, 2016	3,830
For year ended December 31, 2017	$ 3,830

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 213,355	$ 54,026	$ 154,461
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	58,221	65,118	56,978
Non-cash interest charge, net	605	625	540
Non-cash gain on reserve swap		(2,990)
Gain on sale of assets	(13,575)	(1,058)
Asset impairment	2,568	161,336
Non-controlling interest		998	5,065
Change in operating assets and liabilities:
Accounts receivable	(802)	(6,951)	(2,627)
Other assets	(236)	90	(27)
Accounts payable and accrued liabilities	1,909	854	468
Accrued interest	(496)	950	(489)
Deferred revenue	11,684	31,277	42,491
Accrued incentive plan expenses	(3,461)	1,909	6,137
Property, franchise and other taxes payable	1,636	(610)	762
Net cash provided by operating activities	271,408	305,574	258,694
Cash flows from investing activities:
Acquisition of land, coal, other mineral rights and related intangibles	(180,534)	(120,284)	(166,382)
Acquisition or construction of plant and equipment	(681)	(404)	(5,994)
Proceeds from sale of assets	24,822	5,600	1,580
Return on direct financing lease and contractual override	2,669
Investment in direct financing lease	(59,009)
Net cash used in investing activities	(212,733)	(115,088)	(170,796)
Cash flows from financing activities:
Proceeds from loans	148,000	385,000	140,000
Proceeds from issuance of common units			110,436
Deferred financing costs		(2,957)
Repayments of loans	(30,800)	(210,519)	(106,234)
Payment of obligation related to acquisitions	(500)	(7,625)	(9,169)
Costs associated with equity transactions	(59)	(141)	(219)
Fees associated with elimination of IDRs			(2,341)
Distributions	(240,814)	(234,828)	(209,849)
Contributions by general partner			2,350
Net cash used in financing activities	(124,173)	(71,070)	(75,026)
Net increase (decrease) in cash and cash equivalents	(65,498)	119,416	12,872
Cash and cash equivalents at beginning of period	214,922	95,506	82,634
Cash and cash equivalents at end of period	149,424	214,922	95,506
Supplemental cash flow information:
Cash paid during the period for interest	53,842	47,653	41,565
Non-cash investing activities:
Liability assumed in acquisitions			1,593
Non-controlling interest		373	(5,065)
Note receivable related to sale of assets	1,808
Non-cash financing activities:
Purchase obligation related to reserve and infrastructure acquisitions		$ 500	$ 6,200

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Supplemental Financial Data (Unaudited) - Selected Quarterly Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Effect of Fourth Quarter Events [Line Items]
Total revenues	$ 102,436	$ 94,175	$ 90,664	$ 91,872	$ 93,135	$ 103,164	$ 96,532	$ 84,852	$ 379,147	$ 377,683	$ 301,401
Depreciation, depletion and amortization	16,155	14,485	15,172	12,409	13,542	19,819	17,435	14,322	58,221	65,118	56,978
Income (loss) from operations	73,206	65,643	63,492	64,824	(2,600)	(17,796)	68,670	55,861	267,165	104,135	196,061
Net income	$ 60,107	$ 52,001	$ 49,938	$ 51,309	$ (16,903)	$ (30,559)	$ 56,206	$ 45,282	$ 213,355	$ 54,026	$ 154,461
Net income (loss) per limited partner unit	$ 0.56	$ 0.48	$ 0.46	$ 0.47	$ (0.16)	$ (0.28)	$ 0.52	$ 0.42	$ 1.97	$ 0.50	$ 1.54
Weighted average number of common units outstanding	106,028	106,028	106,028	106,028	106,028	106,028	106,028	106,028	106,028	106,028	81,917

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Basis of Presentation and Organization - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012 Coal_Reserves T
Collaborative Arrangements Non collaborative Arrangements And Business Acquisitions Transactions [Line Items]
Number of coal reserves	3
Proven and probable coal reserves	2,400,000,000
Additional aggregate reserves	500,000,000

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Supplemental Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2012

Supplemental Financial Data (Unaudited)

16.    Supplemental Financial Data (Unaudited)

Shown below are selected unaudited quarterly data.

Selected Quarterly Financial Information

(In thousands, except per unit data)

2012	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Total revenues	$	91,872	$	90,664	$	94,175	$	102,436
Depreciation, depletion and amortization	$	12,409	$	15,172	$	14,485	$	16,155
Income from operations	$	64,824	$	63,492	$	65,643	$	73,206
Net income	$	51,309	$	49,938	$	52,001	$	60,107
Net income per limited partner unit	$	0.47	$	0.46	$	0.48	$	0.56
Weighted average number of common units outstanding		106,028		106,028		106,028		106,028

2011	First Quarter		Second Quarter		Third Quarter			Fourth Quarter
Total revenues	$	84,852	$	96,532	$	103,164		$	93,135
Depreciation, depletion and amortization	$	14,322	$	17,435	$	19,819		$	13,542
Income (loss) from operations	$	55,861	$	68,670	$	(17,796	)	$	(2,600	)
Net income (loss)	$	45,282	$	56,206	$	(30,559	)	$	(16,903	)
Net income (loss) per limited partner unit	$	0.42	$	0.52	$	(0.28	)	$	(0.16	)
Weighted average number of common units outstanding		106,028		106,028		106,028			106,028

During the Partnership’s third quarter and fourth quarters of 2011, asset impairment charges of $90.9 million, or $0.84 per unit, and $70.4 million, or $0.65 per unit, were recorded. The Partnership recorded an impairment charge of $2.6 million, or $0.2 per unit, in the fourth quarter of 2012.

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Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]
Maturity of cash and cash equivalents	3 months
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Period of assets which are deprecated on straight line basis over their useful lives	3 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Period of assets which are deprecated on straight line basis over their useful lives	20 years

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Allowance for Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2012

Allowance for Doubtful Accounts

Activity in the allowance for doubtful accounts for the years ended December 31, 2012, 2011 and 2010 was as follows:

	2012		2011			2010
	(In thousands)
Balance, January 1	$	393	$	681		$	372
Provision charged to operations:
Additions to the reserve		318		71			309
Collections of previously reserved accounts		—		(359	)		—
Total charged (credited) to operations		318		(288	)		309
Non-recoverable balances written off		—		—			—
Balance, December 31	$	711	$	393		$	681

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Basis of Presentation and Organization

12 Months Ended

Dec. 31, 2012

Basis of Presentation and Organization

1.    Basis of Presentation and Organization

Natural Resource Partners L.P. (the “Partnership”), a Delaware limited partnership, was formed in April 2002. The general partner of the Partnership is NRP (GP) LP (“NRP GP”), a Delaware limited partnership, whose general partner is GP Natural Resource Partners LLC, a Delaware limited liability company. The Partnership engages principally in the business of owning and managing mineral properties in the United States. The Partnership owns coal reserves in the three major coal-producing regions of the United States: Appalachia, the Illinois Basin and the Western United States, as well as lignite reserves in the Gulf Coast region. As of December 31, 2012, the Partnership owned or controlled approximately 2.4 billion tons of proven and probable coal reserves (unaudited), and also owned approximately 500 million tons of aggregate reserves (unaudited) in a number of states across the country. The Partnership does not operate any mines, but leases reserves to experienced mine operators under long-term leases that grant the operators the right to mine reserves in exchange for royalty payments. Lessees are generally required to make royalty payments based on the higher of a percentage of the gross sales price or a fixed price per ton, in addition to a minimum payment.

In addition, the Partnership owns coal and aggregate transportation and preparation equipment, other coal related rights and oil and gas properties on which it earns revenue.

The Partnership’s operations are conducted through, and its operating assets are owned by, its subsidiaries. The Partnership owns its subsidiaries through a wholly owned operating company, NRP (Operating) LLC. NRP GP has sole responsibility for conducting its business and for managing its operations. Because NRP GP is a limited partnership, its general partner, GP Natural Resource Partners LLC, conducts its business and operations, and the board of directors and officers of GP Natural Resource Partners LLC makes decisions on its behalf. Robertson Coal Management LLC, a limited liability company wholly owned by Corbin J. Robertson, Jr., owns all of the membership interest in GP Natural Resource Partners LLC. Mr. Robertson is entitled to nominate all nine of the directors, five of whom must be independent directors, to the board of directors of GP Natural Resource Partners LLC. In connection with the Cline acquisition, Mr. Robertson delegated the right to nominate two of the directors, one of whom must be independent, to Adena Minerals, LLC, an affiliate of the Cline Group.

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CONSOLIDATED BALANCE SHEETS (Parenthetical)	Dec. 31, 2012	Dec. 31, 2011
Common units, outstanding	106,027,836	106,027,836

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Related Party Transactions

12 Months Ended

Dec. 31, 2012

Related Party Transactions

11.     Related Party Transactions

Reimbursements to Affiliates of our General Partner

The Partnership’s general partner does not receive any management fee or other compensation for its management of Natural Resource Partners L.P. However, in accordance with the partnership agreement, the general partner and its affiliates are reimbursed for expenses incurred on the Partnership’s behalf. All direct general and administrative expenses are charged to the Partnership as incurred. The Partnership also reimburses indirect general and administrative costs, including certain legal, accounting, treasury, information technology, insurance, administration of employee benefits and other corporate services incurred by our general partner and its affiliates.

The reimbursements to affiliates of the Partnership’s general partner for services performed by Western Pocahontas Properties and Quintana Minerals Corporation are as follows:

	For the Years Ended December 31,
	2012		2011		2010
	(In thousands)
Reimbursement for services	$	9,791	$	9,136	$	7,358

The Partnership leases an office building in Huntington, West Virginia from Western Pocahontas Properties and pays $0.6 million in lease payments each year through December 31, 2018.

Transactions with Cline Affiliates

Various companies controlled by Chris Cline lease coal reserves from the Partnership, and the Partnership provides coal transportation services to them for a fee. Mr. Cline, both individually and through another affiliate, Adena Minerals, LLC, owns a 31% interest in the Partnership’s general partner, as well as 12,617,673 common units at December 31, 2012. At December 31, 2012, the Partnership had accounts receivable totaling $6.6 million from Cline affiliates. In addition, the overriding royalty and the lease of the loadout facility at the Sugar Camp mine are classified as contracts receivable of $57.1 million on the Partnership’s Consolidated Balance Sheets. Revenues from the Cline affiliates are as follows: 

	For The Year Ended December 31,
	2012		2011		2010
	(In thousands)
Coal royalty revenues	$	48,567	$	42,474	$	32,407
Processing fees		2,409		2,975		1,337
Transportation fees		19,514		16,689		14,324
Minimums recognized as revenue		17,785		—		12,400
Override revenue		4,066		2,691		1,904
Other revenue		—		2,990		—
	$	92,341	$	67,819	$	62,372

As of December 31, 2012, the Partnership had received $56.6 million in minimum royalty payments that have not been recouped by Cline affiliates, of which $27.7 million was received in the current year.

The Partnership recognized an asset impairment of $90.9 million during the third quarter of 2011 related to certain of the Partnership’s assets at the Gatling WV location and $70.4 million during the fourth quarter of 2011 related to certain assets at the Gatling Ohio location. During the fourth quarter of 2012, the Partnership recognized an additional asset impairment of $2.6 million related to the assets at the Gatling WV location due to receiving a termination notice in December 2012 that the lease is being cancelled as of June 2013. These assets were acquired from and are leased by Cline affiliates.

During 2011 the Partnership recognized a $3.0 million gain on a reserve exchange of over one million tons in Illinois with Williamson Energy. The fair value of the reserves was estimated using Level 3 cash flow approach. The expected cash flows were developed using estimated annual sales tons, forecasted sales prices and anticipated market royalty rates. The tons received were fully mined during 2012, while the tons exchanged are not included in the current mine plans. The gain is located in Other revenues on the Consolidated Statements of Comprehensive Income.

Quintana Capital Group GP, Ltd.

Corbin J. Robertson, Jr. is a principal in Quintana Capital Group GP, Ltd., which controls several private equity funds focused on investments in the energy business. In connection with the formation of Quintana Capital, the Partnership adopted a formal conflicts policy that establishes the opportunities that will be pursued by the Partnership and those that will be pursued by Quintana Capital. The governance documents of Quintana Capital’s affiliated investment funds reflect the guidelines set forth in NRP’s conflicts policy.

A fund controlled by Quintana Capital owns a significant membership interest in Taggart Global USA, LLC, including the right to nominate two members of Taggart’s 5-person board of directors. The Partnership currently has a memorandum of understanding with Taggart Global pursuant to which the two companies have agreed to jointly pursue the development of coal handling and preparation plants. The Partnership owns and leases the plants to Taggart Global, which designs, builds and operates the plants. The lease payments are based on the sales price for the coal that is processed through the facilities. To date, the Partnership has acquired four facilities under this agreement with Taggart with a total cost of $46.6 million. Revenues from Taggart are as follows:

	For the Years Ended December 31,
	2012		2011		2010
	(In thousands)
Processing revenue	$	5,580	$	9,755	$	5,874

During the third quarter, the Partnership sold a preparation plant back to Taggart Global for $12.3 million. The Partnership received $10.5 million in cash and a note receivable from Taggart, payable over three years for the balance. The note receivable balance at December 31, 2012 was $1.7 million. The Partnership recorded a gain of $4.7 million included in Other income of the Consolidated Statements of Income for the third quarter of 2012. The net book value of the asset sold was $7.6 million. At December 31, 2012, the Partnership had accounts receivable totaling $0.5 million from Taggart.

A fund controlled by Quintana Capital owns Kopper-Glo, a small coal mining company that is one of the Partnership’s lessees with operations in Tennessee. Revenues from Kopper-Glo are as follows:

	For the Years Ended December 31,
	2012		2011		2010
	(In thousands)
Coal royalty revenues	$	3,486	$	1,629	$	1,545

At December 31, 2012, the Partnership also had accounts receivable totaling $0.3 million from Kopper-Glo.

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Document and Entity Information (USD $) In Billions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Feb. 28, 2013	Jun. 30, 2012
Entity Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Trading Symbol	NRP
Entity Registrant Name	NATURAL RESOURCE PARTNERS LP
Entity Central Index Key	0001171486
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		109,812,408
Entity Public Float			$ 1.3

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies

12.    Commitments and Contingencies

Legal

The Partnership is involved, from time to time, in various legal proceedings arising in the ordinary course of business. While the ultimate results of these proceedings cannot be predicted with certainty, Partnership management believes these claims will not have a material effect on the Partnership’s financial position, liquidity or operations.

Environmental Compliance

The operations conducted on the Partnership’s properties by its lessees are subject to environmental laws and regulations adopted by various governmental authorities in the jurisdictions in which these operations are conducted. As owner of surface interests in some properties, the Partnership may be liable for certain environmental conditions occurring at the surface properties. The terms of substantially all of the Partnership’s leases require the lessee to comply with all applicable laws and regulations, including environmental laws and regulations. Lessees post reclamation bonds assuring that reclamation will be completed as required by the relevant permit, and substantially all of the leases require the lessee to indemnify the Partnership against, among other things, environmental liabilities. Some of these indemnifications survive the termination of the lease. The Partnership has neither incurred, nor is aware of, any material environmental charges imposed on it related to its properties as of December 31, 2012. The Partnership is not associated with any environmental contamination that may require remediation costs.

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues:
Coal royalties	$ 260,734	$ 279,221	$ 221,761
Aggregate royalties	6,598	6,734	4,230
Processing fees	8,299	13,475	9,604
Transportation fees	19,513	16,688	14,564
Oil and gas royalties	9,160	14,017	7,720
Property taxes	15,273	12,640	11,270
Minimums recognized as revenue	23,956	9,148	14,199
Override royalties	15,527	14,523	11,258
Other	20,087	11,237	6,795
Total revenues	379,147	377,683	301,401
Operating expenses:
Depreciation, depletion and amortization	58,221	65,118	56,978
Asset impairments	2,568	161,336
General and administrative	29,714	29,553	29,893
Property, franchise and other taxes	17,678	14,486	15,107
Transportation costs	1,944	2,033	1,864
Coal royalty and override payments	1,857	1,022	1,498
Total operating expenses	111,982	273,548	105,340
Income from operations	267,165	104,135	196,061
Other income (expense)
Interest expense	(53,972)	(49,180)	(41,635)
Interest income	162	69	35
Income before non-controlling interest	213,355	55,024	154,461
Non-controlling interest		(998)	(5,065)
Net income	213,355	54,026	154,461
Net income attributable to:
General partner	4,267	1,081	2,570
Holders of incentive distribution rights			25,966
Limited partners	209,088	52,945	125,925
Basic and diluted net income per limited partner unit	$ 1.97	$ 0.50	$ 1.54
Weighted average number of common units outstanding	106,028	106,028	81,917
Comprehensive income	$ 213,405	$ 54,079	$ 154,512

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Plant and Equipment

12 Months Ended

Dec. 31, 2012

Plant and Equipment

6.     Plant and Equipment

The Partnership’s plant and equipment consist of the following:

	December 31, 2012			December 31, 2011
	(In thousands)
Plant construction in process	$	—		$	78
Plant and equipment at cost		55,271			67,175
Less accumulated depreciation		(22,870	)		(21,068	)
Net book value	$	32,401		$	46,185

	For the years ended December 31,
	2012		2011		2010
	(In thousands)
Total depreciation expense on plant and equipment	$	6,825	$	8,589	$	8,322

During the third quarter of 2012, the Partnership sold a preparation plant to Taggart Global USA, LLC, a related party, for $12.3 million. See Note 11. “Related Party Transactions” for an understanding of Taggart and the Partnership’s relationship. The Partnership received $10.5 million in cash and a note receivable from Taggart, payable over three years for the balance. The note receivable balance at December 31, 2012 was $1.7 million. The Partnership recorded a gain of $4.7 million included in Other revenues of the Consolidated Statements of Comprehensive Income. The net book value of the asset sold was $7.6 million.

Under the provisions of one of the Partnership’s tipple leases, the lessee exercised its option to purchase the tipple and corresponding land for fair market value, which is greater than the carrying amount of the asset. In May 2011, the lessee paid a $1.0 million deposit that was nonrefundable. In August 2011, the lessee paid the remaining $4.5 million to complete the purchase of the tipple. The Partnership recognized a gain on the sale in the third quarter of $1.1 million, which is included in Other Revenue on the Consolidated Statements of Comprehensive Income.

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Asset Impairments

12 Months Ended

Dec. 31, 2012

Asset Impairments

5.     Asset Impairments

Gatling West Virginia.    In October 2011, the Partnership was informed by Gatling, LLC, a Cline affiliate, that it was idling the operations and was no longer projecting production from the West Virginia mine. The Partnership and Gatling amended the lease with respect to this property to provide that the existing minimum royalty balance of $24.1 million was non-recoupable, that Gatling pay $3.4 million in non-recoupable minimum royalties when they became due in January and April of 2012, that the minimums would be reduced after the first quarter of 2012, and that Gatling would continue to maintain and ventilate the mine. Following the amendment, Gatling satisfied all terms of the lease. Considering all information available at the time of amendment, the Partnership determined that its investment in the Gatling West Virginia property was not fully recoverable by future cash flows. The assets at the time of amendment included coal reserves, certain above market intangibles and coal transportation equipment.

The 2011 asset impairment of $118.4 million was offset by $24.1 million of recoupable minimum payments received from Gatling, LLC to date and $3.4 million in cash payments received in 2012, resulting in a net asset impairment of $90.9 million, which is included in operating expenses on the Consolidated Statements of Comprehensive Income.

In December 2012, the Partnership was informed by Gatling that it was dismantling their preparation plant and removing it from the site and cancelling the lease effective June 2013. The Partnership considered this new information as another impairment triggering event and reassessed the remaining coal reserves and coal transportation equipment fair values for impairment. The fair values of both the remaining reserves and transportation equipment were determined using Level 2 market approaches based upon recent comparable transactions. The reserves were adjusted for the mine’s specific characteristics. The 2012 asset impairment of $2.6 million is included in operating expenses on the Consolidated Statements of Comprehensive Income.

The net book value and calculated fair values of the assets relating to the Gatling West Virginia operation were as follows:

	2012 Measurement Date				2011 Measurement Date
	Fair Value		Net Book Value		Fair Value		Net Book Value
	(In thousands)
Coal and other mineral rights, net	$	4,050	$	6,618	$	6,618	$	76,003
Intangible assets, net		—		—		—		43,855
Plant and equipment, net		1,981		1,981		2,600		7,775
Total	$	6,031	$	8,599	$	9,218	$	127,633

Gatling Ohio.    In December 2011, the Partnership was informed by Gatling Ohio, LLC, a Cline affiliate, that it was idling its operations and was no longer projecting production from the Ohio mine. Gatling Ohio’s recoupable minimum royalty balance as of December 31, 2011 was $9.6 million. Considering all information the Partnership determined that its investment in the Gatling Ohio property would not be fully recovered by future cash flows. The assets include coal reserves, certain above market intangibles and coal transportation equipment. The asset impairment of $70.4 million is included in operating expenses in 2011 on the Consolidated Statements of Income.

The net book value as of the measurement date and calculated fair values of the assets relating to the Gatling Ohio operation are as follows:

	2011 Measurement Date
	Fair Value		Net Book Value
	(In thousands)
Coal and other mineral rights, net	$	20,035	$	56,769
Intangible assets, net		—		33,670
Plant and equipment, net		2,947		2,947
Total	$	22,982	$	93,386

In determining the 2011 impairments of the Gatling West Virginia and Gatling Ohio assets, the fair values of the coal rights were estimated using a weighted combination of Level 3 expected cash flow and Level 2 market approaches. The fair values of the transportation equipment were estimated using Level 2 market approaches. The expected cash flows were developed using estimated annual sales tons, as well as forecasted sales prices and anticipated market royalty rates. The market approaches include references to recent comparable transactions that were adjusted for each mine’s specific characteristics. Since Gatling, LLC is no longer projecting production in the near term future for the West Virginia and Ohio properties, the related royalty and transportation contract intangible assets were estimated to have no fair value as of the measurement date.

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2012

Principles of Consolidation

Principles of Consolidation

The financial statements include the accounts of Natural Resource Partners L.P. and its wholly owned subsidiaries as well as BRP LLC, a venture with International Paper Company controlled by the Partnership. Intercompany transactions and balances have been eliminated.

Business Combinations

Business Combinations

For purchase acquisitions accounted for as a business combination, the Partnership is required to record the assets acquired, including identified intangible assets and liabilities assumed at their fair value, which in many instances involves estimates based on third party valuations, such as appraisals, or internal valuations based on discounted cash flow analyses or other valuation techniques.

Use of Estimates

Use of Estimates

Preparation of the accompanying financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities in the accompanying Consolidated Balance Sheets and the reported amounts of revenues and expenses in the accompanying Consolidated Statements of Comprehensive Income during the reporting period. Actual results could differ from those estimates.

Fair Value

Fair Value

The Partnership discloses certain assets and liabilities using fair value as defined by FASB’s fair value authoritative guidance. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. See “Note 10. Fair Value Measurements”.

FASB’s guidance describes three levels of inputs that may be used to measure fair value:

• Level 1 — Quoted prices in active markets for identical assets or liabilities.

• Level 2 — Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

• Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.

Cash Equivalents and Restricted Cash

Cash Equivalents and Restricted Cash

The Partnership considers all highly liquid short-term investments with an original maturity of three months or less to be cash equivalents.

Accounts Receivable

Accounts Receivable

Accounts receivable from the Partnership’s lessees do not bear interest. Receivables are recorded net of the allowance for doubtful accounts in the accompanying Consolidated Balance Sheets. The Partnership evaluates the collectability of its accounts receivable based on a combination of factors. The Partnership regularly analyzes its lessees’ accounts and when it becomes aware of a specific customer’s inability to meet its financial obligations to the Partnership, such as in the case of bankruptcy filings or deterioration in the lessee’s operating results or financial position, the Partnership records a specific reserve for bad debt to reduce the related receivable to the amount it reasonably believes is collectible. Accounts are charged off when collection efforts are complete and future recovery is doubtful. If circumstances related to specific lessees change, the Partnership’s estimates of the recoverability of receivables could be further adjusted.

Land and Mineral Rights

Land and Mineral Rights

Land and mineral rights owned and leased are recorded at cost. Coal and aggregate mineral rights are depleted on a unit-of-production basis by lease, based upon minerals mined in relation to the net cost of the mineral properties and estimated proven and probable tonnage therein, or over the amortization period of the lease. The Partnership leases its oil and gas minerals interests, all of which are located in the U.S., to third-party entities for the exploration and production of oil and natural gas. Proven producing oil and natural gas mineral rights are depleted on a units of production basis. The Partnership is solely a royalty owner and as a result it does not determine whether or when to develop reserves.

Plant and Equipment

Plant and Equipment

Plant and equipment consists of coal preparation plants, related coal handling facilities, and other coal and aggregate processing and transportation infrastructure. Expenditures for new facilities and expenditures that substantially increase the useful life of property, including interest during construction, are capitalized and reported in the Consolidated Statements of Cash Flows. These assets are recorded at cost and are being depreciated on a straight-line basis over their useful lives, which when originally recorded range from three to twenty years.

Intangible Assets

Intangible Assets

The Partnership’s intangible assets consist of above-market contracts. Intangible assets are identified related to contracts acquired when compared to the estimate of current market rates for similar contracts. The estimated fair value of the above-market rate contracts are determined based on the present value of future cash flow projections related to the underlying assets acquired. Intangible assets are amortized on a unit-of-production basis except that a minimum amortization is calculated on a straight line basis for temporarily idled assets.

Deferred Financing Costs

Deferred Financing Costs

Deferred financing costs consist of legal and other costs related to the issuance of the Partnership’s revolving credit facility and senior notes. These costs are amortized over the term of the debt.

Asset Impairment

Asset Impairment

If facts and circumstances suggest that a long-lived asset or an intangible asset may be impaired, the carrying value is reviewed. If this review indicates that the value of the asset will not be recoverable, as determined based on projected undiscounted cash flows related to the asset over its remaining life, then the carrying value of the asset is reduced to its estimated fair value.

Revenues

Revenues

Coal and Aggregate Royalties.    Coal and aggregate royalty revenues are recognized on the basis of tons of mineral sold by the Partnership’s lessees and the corresponding revenue from those sales. Generally, the lessees make payments to the Partnership based on the greater of a percentage of the gross sales price or a fixed price per ton of mineral they sell.

Processing and Transportation Fees.    Processing fees are recognized on the basis of tons of material processed through the facilities by the Partnership’s lessees and the corresponding revenue from those sales. Generally, the lessees of the processing facilities make payments to the Partnership based on the greater of a percentage of the gross sales price or a fixed price per ton of material that is processed and sold from the facilities. The processing leases are structured in a manner so that the lessees are responsible for operating and maintenance expenses associated with the facilities. Transportation fees are recognized on the basis of tons of material transported over the beltlines. Under the terms of the transportation contracts, the Partnership receives a fixed price per ton for all material transported on the beltlines.

Oil and Gas Royalties.    Oil and gas royalties are recognized on the basis of volume of hydrocarbons sold by lessees and the corresponding revenue from those sales. Generally, the lessees make payments based on a percentage of the selling price. Also, included within oil and gas royalties are lease bonus payments, which are generally paid upon the execution of a lease. Some leases are subject to minimum annual payments or delay rentals.

Minimum Royalties.    Most of the Partnership’s lessees must make minimum annual or quarterly payments which are generally recoupable over certain time periods. These minimum payments are recorded as deferred revenue when received. The deferred revenue attributable to the minimum payment is recognized as royalty revenue when the lessee recoups the minimum payment through production. The deferred revenue is recognized as minimums recognized as revenue in the period immediately following the expiration of the lessee’s ability to recoup the payments.

Lessee Audits and Inspections

Lessee Audits and Inspections

The Partnership periodically audits lessee information by examining certain records and internal reports of its lessees. The Partnership’s regional managers also perform periodic mine inspections to verify that the information that has been submitted to it is accurate. The audit and inspection processes are designed to identify material variances from lease terms as well as differences between the information reported to the Partnership and the actual results from each property. Audits and inspections, however, are in periods subsequent to when the revenue is reported and any adjustment identified by these processes might be in a reporting period different from when the revenue was initially recorded. Typically there are no material adjustments from this process.

Property Taxes

Property Taxes

The Partnership is responsible for paying property taxes on the properties it owns. Typically, the lessees are contractually responsible for reimbursing the Partnership for property taxes on the leased properties. The reimbursement of property taxes is included in property tax revenue in the Consolidated Statements of Comprehensive Income.

Income Taxes

Income Taxes

No provision for income taxes related to the operations of the Partnership has been included in the accompanying financial statements because, as a partnership, it is not subject to federal or material state income taxes and the tax effect of its activities accrues to the unitholders. Net income for financial statement purposes may differ significantly from taxable income reportable to unitholders as a result of differences between the tax bases and financial reporting bases of assets and liabilities. In the event of an examination of the Partnership’s tax return, the tax liability of the partners could be changed if an adjustment in the Partnership’s income is ultimately sustained by the taxing authorities.

Share-Based Payment

Share-Based Payment

The Partnership accounts for awards relating to its Long-Term Incentive Plan using the fair value method, which requires the Partnership to estimate the fair value of the grant, and charge or credit the estimated fair value to expense over the service or vesting period of the grant based on fluctuations in the Partnership’s common unit price. In addition, estimated forfeitures are included in the periodic computation of the fair value of the liability and the fair value is recalculated at each reporting date over the service or vesting period of the grant.

New Accounting Standards

New Accounting Standards

In June 2011, the FASB amended the presentation of comprehensive income. The amendments in this update gave the Partnership the option to present the total comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. The amendments in this update also require the Partnership to present changes in accumulated other comprehensive income by component in the statement of unitholders’ equity or in the notes to the financial statements. The Partnership adopted this amendment on January 1, 2012 and elected to present other comprehensive income in a single continuous statement, Consolidated Statements of Comprehensive Income. The Partnership also elected to present changes in accumulated other comprehensive income in the Consolidated Statements of Partners’ Capital.

In May 2011, the FASB amended fair value measurement and disclosure requirements. The amendments result in common fair value measurement and disclosure requirements in U.S. GAAP and International Financial Reporting Standards (IFRSs). Some of the amendments clarify the FASB’s intent about the application of existing fair value measurement requirements. Other amendments change a particular principal or requirement for measuring fair value or for disclosing information about fair value measurements. The Partnership adopted this amendment on January 1, 2012. The amendment did not have a material impact on its financial position, results of operations, cash flows or notes to the financial statements.

Other accounting standards that have been issued by the FASB or other standards-setting bodies are not expected to have a material impact on the Partnership’s financial position, results of operations and cash flows.

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Major Lessees

12 Months Ended

Dec. 31, 2012

Major Lessees

13.    Major Lessees

The Partnership has the following lessees that generated in excess of ten percent of total revenues in any one of the years ended December 31, 2012, 2011, and 2010. Revenues from these lessees are as follows:

	For the Years Ended December 31,
	2012					2011					2010
	Revenues		Percent			Revenues		Percent			Revenues		Percent
	(Dollars in thousands)
The Cline Group	$	92,341		24.4	%	$	67,819		18.0	%	$	62,372		20.7	%
Alpha Natural Resources	$	81,077		21.4	%	$	107,267		28.4	%	$	79,084		26.2	%

In 2012, the Partnership derived over 45.8% of its revenue from two companies listed above. As a result, the Partnership has a significant concentration of revenues with those lessees, although in most cases, with the exception of the Williamson mine operated by an affiliate of Foresight Energy, the exposure is spread out over a number of different mining operations and leases. Cline’s Williamson mine alone was responsible for approximately 12.4%, 11.7% and 11.5% of our total revenues for 2012, 2011 and 2010, respectively. As a result of the merger of Alpha Natural Resources and Massey Energy Company, all prior period revenues from Massey have been combined with those of Alpha for presentation purposes in this 10-K.

Substantially all of the Partnership’s accounts receivable result from amounts due from third-party companies in the coal industry, with approximately 53% of our total revenues being attributable to coal royalty revenues from Appalachia. This concentration of customers may impact the Partnership’s overall credit risk, either positively or negatively, in that these entities may be collectively affected by the same changes in economic or other conditions. Receivables are generally not collateralized.

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Long-Term Debt

12 Months Ended

Dec. 31, 2012

Long-Term Debt

9.     Long-Term Debt

Long-term debt consists of the following:

	December 31, 2012			December 31, 2011
	(In thousands)
$300 million floating rate revolving credit facility, due August 2016	$	148,000		$	—
5.55% senior notes, with semi-annual interest payments in June and December, maturing June 2013		35,000			35,000
4.91% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, maturing in June 2018		27,700			32,317
8.38% senior notes, with semi-annual interest payments in March and September, with scheduled principal payments beginning March 2013, maturing in March 2019		150,000			150,000
5.05% senior notes, with semi-annual interest payments in January and July, with annual principal payments in July, maturing in July 2020		61,538			69,230
5.31% utility local improvement obligation, with annual principal and interest payments, maturing in March 2021		1,731			1,922
5.55% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, maturing in June 2023		30,300			33,600
4.73% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2023		75,000			75,000
5.82% senior notes, with semi-annual interest payments in March and September, with annual principal payments in March, maturing in March 2024		180,000			195,000
8.92% senior notes, with semi-annual interest payments in March and September, with scheduled principal payments beginning March 2014, maturing in March 2024		50,000			50,000
5.03% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2026		175,000			175,000
5.18% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2026		50,000			50,000
Total debt		984,269			867,069
Less — current portion of long term debt		(87,230	)		(30,801	)
Long-term debt	$	897,039		$	836,268

Principal payments due in:

	Senior Notes		Credit Facility		Total
	(In thousands)
2013	$	87,230	$	—	$	87,230
2014		80,983		—		80,983
2015		80,983		—		80,983
2016		80,983		148,000		228,983
2017		80,983		—		80,983
Thereafter		425,107		—		425,107
	$	836,269	$	148,000	$	984,269

The senior note purchase agreement contains covenants requiring our operating subsidiary to:

• Maintain a ratio of consolidated indebtedness to consolidated EBITDA (as defined in the note purchase agreement) of no more than 4.0 to 1.0 for the four most recent quarters;

• not permit debt secured by certain liens and debt of subsidiaries to exceed 10% of consolidated net tangible assets (as defined in the note purchase agreement); and

• maintain the ratio of consolidated EBITDA to consolidated fixed charges (consisting of consolidated interest expense and consolidated operating lease expense) at not less than 3.5 to 1.0.

The 8.38% and 8.92% senior notes also provide that in the event that the Partnership’s leverage ratio exceeds 3.75 to 1.00 at the end of any fiscal quarter, then in addition to all other interest accruing on these notes, additional interest in the amount of 2.00% per annum shall accrue on the notes for the two succeeding quarters and for as long thereafter as the leverage ratio remains above 3.75 to 1.00.

The Partnership made principal payments of $30.8 million on its senior notes during the year ended December 31, 2012.

On August 10, 2011, the Partnership completed an amendment and restatement of its $300 million revolving credit facility. The amendment extends the term of the credit facility to August 2016. The Partnership incurs a commitment fee on the undrawn portion of the revolving credit facility at rates ranging from 0.18% to 0.40% per annum. Also, the accordion feature in the credit facility, where the Partnership may request its lenders to increase their aggregate commitment to a maximum of $500 million on the same terms.

At December 31, 2012 the Partnership had $148.0 million outstanding on its revolving credit facility, while at December 31, 2011 the Partnership did not have any outstanding balance. The weighted average interest rates for the year ended December 31, 2012 and the year ended December 31, 2011 were 2.09% and 1.83%, respectively.

The revolving credit facility contains covenants requiring the Partnership to maintain:

• a ratio of consolidated indebtedness to consolidated EBITDDA (as defined in the credit agreement) not to exceed 4.0 to 1.0; and

• a ratio of consolidated EBITDDA to consolidated fixed charges (consisting of consolidated interest expense and consolidated lease operating expense) not less than 3.5 to 1.0 for the four most recent quarters.

The Partnership was in compliance with all terms under its long-term debt as of December 31, 2012.

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Supplemental Financial Data (Unaudited) - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011
Effect of Fourth Quarter Events [Line Items]
Asset impairments	$ 2,600	$ 70,400	$ 90,900	$ 2,568	$ 161,336
Asset impairment charges, per unit	$ 0.20	$ 0.65	$ 0.84

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Mineral Rights

12 Months Ended

Dec. 31, 2012

Mineral Rights

7.     Mineral Rights

The Partnership’s mineral rights consist of the following:

	December 31, 2012			December 31, 2011
	(In thousands)
Mineral rights	$	1,815,424		$	1,645,451
Less accumulated depletion and amortization		(434,996	)		(387,950	)
Net book value	$	1,380,428		$	1,257,501

	For the years ended December 31,
	2012		2011		2010
	(In thousands)
Total depletion and amortization expense on mineral interests	$	47,042	$	47,230	$	38,501

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Intangible Assets

12 Months Ended

Dec. 31, 2012

Intangible Assets

8.     Intangible Assets

Amounts recorded as intangible assets along with the balances and accumulated amortization at December 31, 2012 and 2011 are reflected in the table below:

	December 31, 2012			December 31, 2011
	(In thousands)
Contract intangibles	$	89,420		$	89,420
Less accumulated amortization		(18,609	)		(14,256	)
Net book value	$	70,811		$	75,164

	For the years ended December 31,
	2012		2011		2010
	(In thousands)
Total amortization expense on intangible assets	$	4,354	$	9,298	$	10,150

The estimates of amortization expense for the periods as indicated below are based on current mining plans and are subject to revision as those plans change in future periods.

Estimated amortization expense (In thousands)
For year ended December 31, 2013	$	3,818
For year ended December 31, 2014		3,690
For year ended December 31, 2015		3,830
For year ended December 31, 2016		3,830
For year ended December 31, 2017		3,830

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Fair Value Measurements

12 Months Ended

Dec. 31, 2012

Fair Value Measurements

10.     Fair Value Measurements

The Partnership’s financial instruments consist of cash and cash equivalents, accounts receivable, accounts payable and long-term debt. The carrying amount of the Partnership’s financial instruments included in accounts receivable and accounts payable approximates their fair value due to their short-term nature except for the accounts receivable — affiliate relating to the Sugar Camp override and Taggart preparation plant sale that includes both current and long-term portions. The Partnership’s cash and cash equivalents include money market accounts and are considered a Level 1 measurement. The fair market value and carrying value of the contractual override, Taggart note receivable and long-term senior notes are as follows:

	Fair Value As Of				Carrying Value As Of
	December 31, 2012		December 31, 2011		December 31, 2012		December 31, 2011
	(In thousands)
Assets
Sugar Camp override, current and long-term	$	8,817	$	—	$	7,495	$	—
Taggart plant receivable, current and long term	$	1,668	$	—	$	1,667	$	—
Liabilities
Long-term debt, current and long-term	$	876,574	$	915,959	$	836,269	$	867,069

The fair value of the Sugar Camp override, Taggart plant receivable and long-term debt is estimated by management using comparable term risk-free treasury issues with a market rate component determined by current financial instruments with similar characteristics which is a Level 3 measurement. Since the Partnership’s credit facility is variable rate debt, its fair value approximates its carrying amount.

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Supplemental Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Selected Quarterly Financial Information

Shown below are selected unaudited quarterly data.

Selected Quarterly Financial Information

(In thousands, except per unit data)

2012	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Total revenues	$	91,872	$	90,664	$	94,175	$	102,436
Depreciation, depletion and amortization	$	12,409	$	15,172	$	14,485	$	16,155
Income from operations	$	64,824	$	63,492	$	65,643	$	73,206
Net income	$	51,309	$	49,938	$	52,001	$	60,107
Net income per limited partner unit	$	0.47	$	0.46	$	0.48	$	0.56
Weighted average number of common units outstanding		106,028		106,028		106,028		106,028

2011	First Quarter		Second Quarter		Third Quarter			Fourth Quarter
Total revenues	$	84,852	$	96,532	$	103,164		$	93,135
Depreciation, depletion and amortization	$	14,322	$	17,435	$	19,819		$	13,542
Income (loss) from operations	$	55,861	$	68,670	$	(17,796	)	$	(2,600	)
Net income (loss)	$	45,282	$	56,206	$	(30,559	)	$	(16,903	)
Net income (loss) per limited partner unit	$	0.42	$	0.52	$	(0.28	)	$	(0.16	)
Weighted average number of common units outstanding		106,028		106,028		106,028			106,028

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Related Party Transactions - Summary of Reimbursements (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Reimbursement for services	$ 9,791	$ 9,136	$ 7,358

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Subsequent Events (Unaudited)

12 Months Ended

Dec. 31, 2012

Subsequent Events (Unaudited)

15.    Subsequent Events (Unaudited)

The following represents material events that have occurred subsequent to December 31, 2012 through the time of the Partnership’s filing its Form 10-K with the SEC:

Distributions

On January 22, 2013, the Partnership declared a distribution of $0.55 per unit to be paid on February 14, 2013 to unitholders of record on February 5, 2013.

Significant Acquisition

On January 24, 2013, the Partnership acquired non-controlling equity interests in OCI Wyoming Co. (OCI Co) and OCI Wyoming, L.P. (OCI LP). The interests are comprised of a 48.51% general partner interest in OCI LP and 20% of the common stock and 100% of the preferred stock in OCI Co. OCI Co owns a 1% limited partnership interest in OCI LP and has the right to receive a $14.5 million annual priority distribution before distributions are paid to other interests. The 80% common interest in OCI Co is owned by OCI Chemical Corporation and the 50.49% interest in OCI LP is owned by OCI Wyoming Holding Co., a subsidiary of OCI Chemical Corporation. The 23,200 shares of preferred stock are subject to certain liquidation preferences in the event of any liquidation, dissolution or winding up of OCI Co at $2,776 per share plus any accrued and unpaid preferred dividends. The liquidation value was $64.4 million at December 31, 2012.

OCI LP’s operations consist of the mining of trona ore, which, when refined, becomes soda ash. All soda ash is sold through an affiliated sales agent to various domestic and European customers and to American Natural Soda Ash Corporation for export. All mining and refining activities take place in one facility located in the Green River Basin, Wyoming. OCI Co’s only significant asset is its ownership interest in OCI LP.

The three investments were acquired from Anadarko Holding Company and its subsidiary, Big Island Trona Company for $292.5 million. The purchase price was funded from the proceeds of a $200 million term loan, $76.5 million in equity and GP interests issued in a private placement and the balance from operating cash. The acquisition agreement provides for a net present value of up to $50 million in cumulative additional contingent consideration should certain performance criteria be met as defined in the purchase and sales agreement in any of 2013, 2014 or 2015.

Equity and Debt Issuance

As discussed in the Significant Acquisition note above, on January 24, 2013, the Partnership issued approximately 3.8 million common units and $200 million in new term debt in conjunction with the acquisition of its equity interests in OCI Wyoming Co. and OCI Wyoming, L.P. The common units were issued in a private placement and were priced at $19.82 and reflect a 4.5% discount to the volume-weighted average closing price of the Partnership’s common units for the 15 trading days immediately prior to closing. The issuance, along with NRP GP’s capital contribution, generated $76.5 million of new capital used in the acquisition. The Partnership also issued term debt which is priced at LIBOR + 2% and adjusts periodically with changes in LIBOR. The rate was 2.3% at closing and interest is payable initially in April 2013 with principal payments beginning January 23, 2014 of $10.0 million, $20.0 million on January 23, 2015 with the balance due on January 23, 2016. The debt is unsecured but guaranteed by the operating subsidiaries of the Partnership.

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Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2012

Plant and Equipment

The Partnership’s plant and equipment consist of the following:

	December 31, 2012			December 31, 2011
	(In thousands)
Plant construction in process	$	—		$	78
Plant and equipment at cost		55,271			67,175
Less accumulated depreciation		(22,870	)		(21,068	)
Net book value	$	32,401		$	46,185

	For the years ended December 31,
	2012		2011		2010
	(In thousands)
Total depreciation expense on plant and equipment	$	6,825	$	8,589	$	8,322

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Long Term Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Ratio	Dec. 31, 2011	Aug. 10, 2011
Proforma Debt Instrument [Line Items]
Ratio of consolidated indebtedness	No more than 4.0 to 1.0
Percentage of consolidated net tangible assets debt of subsidiaries not permitted to exceed	10.00%
Ratio of EBITDA to consolidated fixed charges	Not less than 3.5 to 1.0
Partnerships leverage ratio	3.75 to 1.00
Additional interest accrue	2.00%
Partnership leverage ratio	3.75
Restated revolving credit facility			$ 300
Maximum increase in aggregate commitment	500
Revolving Credit Facility Outstanding Balance	148.0	0
Weighted average interest rate	2.09%	1.83%
Maximum leverage ratio	4.0
Minimum interest coverage ratio	3.5
Minimum [Member]
Proforma Debt Instrument [Line Items]
Revolving credit facility	0.18%
Maximum [Member]
Proforma Debt Instrument [Line Items]
Revolving credit facility	0.40%
Credit Facility [Member]
Proforma Debt Instrument [Line Items]
Ratio of consolidated indebtedness	3.75 to 1.00
Senior Notes [Member]
Proforma Debt Instrument [Line Items]
Principal payments on its senior notes	30.8
$300 million floating rate revolving credit facility, due August 2016 [Member]
Proforma Debt Instrument [Line Items]
Restated revolving credit facility	$ 300
Commitment fee on the undrawn portion of the revolving credit facility rates	0.18% to 0.40%

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Plant and Equipment - Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Plant construction in process		$ 78
Plant and equipment at cost	55,271	67,175
Less accumulated depreciation	(22,870)	(21,068)
Net book value	32,401	46,185
Total depreciation expense on plant and equipment	$ 6,825	$ 8,589	$ 8,322

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STATEMENTS OF PARTNERS' CAPITAL (USD $) In Thousands, except Share data	Total	General Partner [Member]	Common Stock [Member]	Holders of Incentive Distribution Rights [Member]	Non-controlling Interest [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2009	$ 765,226	$ 13,409	$ 747,437	$ 4,977		$ (597)
Balance, units at Dec. 31, 2009			69,451,136
Distributions	(209,849)	(4,197)	(174,709)	(30,943)
Issuance of units, net	110,217		110,217
Issuance of units, net, shares			36,576,700
Capital contribution	2,350	2,350
Fees associated with elimination of IDRs	(2,341)		(2,341)
Non-controlling interest	5,065				5,065
Net income for the year ended	154,461	2,570	125,925	25,966
Loss on interest hedge	51					51
Comprehensive income	154,512					51
Balance at Dec. 31, 2010	825,180	14,132	806,529		5,065	(546)
Balance, units at Dec. 31, 2010			106,027,836
Distributions	(234,828)	(4,696)	(230,080)		(52)
Non-controlling interest adjustment	(373)				(373)
Costs associated with equity transactions	(141)		(141)
Non-controlling interest	998				998
Net income for the year ended	54,026	1,081	52,945
Loss on interest hedge	53					53
Comprehensive income	54,079					53
Balance at Dec. 31, 2011	644,915	10,517	629,253		5,638	(493)
Balance, units at Dec. 31, 2011			106,027,836
Distributions	(240,814)	(4,758)	(233,263)		(2,793)
Costs associated with equity transactions	(59)		(59)
Net income for the year ended	213,355	4,267	209,088
Loss on interest hedge	50					50
Comprehensive income	213,405					50
Balance at Dec. 31, 2012	$ 617,447	$ 10,026	$ 605,019		$ 2,845	$ (443)
Balance, units at Dec. 31, 2012			106,027,836

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Allowance for Doubtful Accounts

12 Months Ended

Dec. 31, 2012

Allowance for Doubtful Accounts

4.     Allowance for Doubtful Accounts

Activity in the allowance for doubtful accounts for the years ended December 31, 2012, 2011 and 2010 was as follows:

	2012		2011			2010
	(In thousands)
Balance, January 1	$	393	$	681		$	372
Provision charged to operations:
Additions to the reserve		318		71			309
Collections of previously reserved accounts		—		(359	)		—
Total charged (credited) to operations		318		(288	)		309
Non-recoverable balances written off		—		—			—
Balance, December 31	$	711	$	393		$	681

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Subsequent Events (Unaudited) - Additional Information (Detail) (USD $)	12 Months Ended				1 Months Ended			1 Months Ended				1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2010 Common Stock [Member]	Jan. 24, 2013 Subsequent Event [Member] D Investment	Jan. 22, 2013 Subsequent Event [Member]	Jan. 24, 2013 Subsequent Event [Member] Private Placement [Member]	Jan. 24, 2013 Subsequent Event [Member] Year 2014 [Member]	Jan. 24, 2013 Subsequent Event [Member] Year 2015 [Member]	Jan. 24, 2013 Subsequent Event [Member] Year 2016 [Member]	Jan. 24, 2013 Subsequent Event [Member] Big Island Trona [Member]	Jan. 24, 2013 Subsequent Event [Member] Oci Wyoming Lp [Member]	Jan. 24, 2013 Subsequent Event [Member] Oci Wyoming Co [Member]	Jan. 24, 2013 Subsequent Event [Member] Oci Wyoming Co [Member] Common Stock [Member]	Jan. 24, 2013 Subsequent Event [Member] Oci Wyoming Co [Member] Preferred Stock [Member]	Jan. 24, 2013 Subsequent Event [Member] Oci Chemical Corporation [Member]
Subsequent Event [Line Items]
Distributions per unit declared						0.55
Percentage of General partner interest												48.51%
Percentage of Ownership													50.49%	20.00%	100.00%	80.00%
Percentage of limited partnership interest in OCI LP													1.00%
Annual priority distribution	$ 240,814,000	$ 234,828,000	$ 209,849,000									$ 14,500,000
Preferred stock subject to liquidation					23,200
Preferred stock liquidation preference, per share					$ 2,776
Liquidation value of Preferred Stock	64,400,000
Acquisition value											292,500,000
No of Investments Acquired					3
Term loan provided for acquisition											200,000,000
Amount received from Private placement											76,500,000
Acquisition Agreement											50,000,000
Partnership common units					3,800,000
New term debt in conjunction with the acquisition					200,000,000
Volume weighted average closing price							$ 19.82
Discount of weighted average closing price					4.50%
Trading days immediately prior to closing					15
New capital used in acquisition			110,217,000	110,217,000	76,500,000
Debt instrument price description					The Partnership also issued term debt which is priced at LIBOR + 2% and adjusts periodically with changes in LIBOR.
Closing interest rate					2.30%
Debt instrument, interest rate					2.00%
Debt instrument principal payment								$ 10,000,000	$ 20,000,000
Beginning date of principal payment								Jan. 23, 2014
Principal payment date									Jan. 23, 2015	Jan. 23, 2016

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Mineral Rights (Tables)

12 Months Ended

Dec. 31, 2012

Mineral Rights

The Partnership’s mineral rights consist of the following:

	December 31, 2012			December 31, 2011
	(In thousands)
Mineral rights	$	1,815,424		$	1,645,451
Less accumulated depletion and amortization		(434,996	)		(387,950	)
Net book value	$	1,380,428		$	1,257,501

	For the years ended December 31,
	2012		2011		2010
	(In thousands)
Total depletion and amortization expense on mineral interests	$	47,042	$	47,230	$	38,501

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Allowance for Doubtful Accounts - Activity in Allowance for Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Provision charged to operations:
Non-recoverable balances written off
Allowance for Doubtful Accounts [Member]
Allowance For Doubtful Accounts Receivable [Line Items]
Balance, January 1	393	681	372
Provision charged to operations:
Additions to the reserve	318	71	309
Collections of previously reserved accounts		(359)
Total charged (credited) to operations	318	(288)	309
Balance, December 31	$ 711	$ 393	$ 681

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Incentive Plans

12 Months Ended

Dec. 31, 2012

Incentive Plans

14.    Incentive Plans

GP Natural Resource Partners LLC adopted the Natural Resource Partners Long-Term Incentive Plan (the “Long-Term Incentive Plan”) for directors of GP Natural Resource Partners LLC and employees of its affiliates who perform services for the Partnership. The compensation committee of GP Natural Resource Partners LLC’s board of directors administers the Long-Term Incentive Plan. Subject to the rules of the exchange upon which the common units are listed at the time, the board of directors and the compensation committee of the board of directors have the right to alter or amend the Long-Term Incentive Plan or any part of the Long-Term Incentive Plan from time to time. Except upon the occurrence of unusual or nonrecurring events, no change in any outstanding grant may be made that would materially reduce the benefit intended to be made available to a participant without the consent of the participant.

Under the plan a grantee will receive the market value of a common unit in cash upon vesting. Market value is defined as the average closing price over the 20 trading days prior to the vesting date. The compensation committee may make grants under the Long-Term Incentive Plan to employees and directors containing such terms as it determines, including the vesting period. Outstanding grants vest upon a change in control of the Partnership, the general partner, or GP Natural Resource Partners LLC. If a grantee’s employment or membership on the board of directors terminates for any reason, outstanding grants will be automatically forfeited unless and to the extent the compensation committee provides otherwise.

A summary of activity in the outstanding grants for the year ended December 31, 2012 are as follows:

Outstanding grants at the beginning of the period	870,344
Grants during the period	272,150
Grants vested and paid during the period	(189,736	)
Forfeitures during the period	(40,444	)
Outstanding grants at the end of the period	912,314

Grants typically vest at the end of a four-year period and are paid in cash upon vesting. The liability fluctuates with the market value of the Partnership common units and because of changes in estimated fair value determined each quarter using the Black-Scholes option valuation model. Risk free interest rates and historical volatility are reset at each calculation based on current rates corresponding to the remaining vesting term for each outstanding grant and ranged from 0.18% to 0.35% and 29.39% to 35.157%, respectively at December 31, 2012. The Partnership’s cumulative average dividend rate of 7.03% was used in the calculation at December 31, 2012. The Partnership accrued expenses related to its plans to be reimbursed to its general partner of $2.9 million, $7.4 million and $9.0 million for the years ended December 31, 2012, 2011 and 2010, respectively. In connection with the Long-Term Incentive Plans, cash payments of $6.6 million, $5.7 million and $3.2 million were paid during each of the years ended December 31, 2012, 2011, and 2010, respectively. The grant date fair value was $33.38, $42.93 and $29.42 per unit for awards in 2012, 2011 and 2010, respectively.

In connection with the phantom unit awards, the CNG committee also granted tandem Distribution Equivalent Rights, or DERs, which entitle the holders to receive distributions equal to the distributions paid on the Partnership’s common units. The DERs are payable in cash upon vesting but may be subject to forfeiture if the grantee ceases employment prior to vesting.

The unaccrued cost, associated with unvested outstanding grants and related DERs at December 31, 2012, was $7.7 million.