10-Q/A

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q/A

(Amendment No. 1)

(Mark One)

xQuarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended June 30, 2011

oTransition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from             to             .

Commission file number: 1-13105

(Exact name of registrant as specified in its charter)

Delaware	43-0921172
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

One CityPlace Drive, Suite 300, St. Louis, Missouri	63141
(Address of principal executive offices)	(Zip code)

Registrant’s telephone number, including area code: (314) 994-2700

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 x No o

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 during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes x No o

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. (Check one):

Large accelerated filer x	Accelerated filer o
Non-accelerated filer o	Smaller reporting company o
(Do not check if a smaller reporting company)

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

At August 4, 2011 there were 213,081,699 shares of the registrant’s common stock outstanding.

Explanatory Note

The purpose of this Amendment No. 1 to Arch Coal, Inc.’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2011, filed with the Securities and Exchange Commission on August 9, 2011 (“the Form 10-Q”), is solely to furnish Exhibit 101 to the Form 10-Q, consisting of Arch Coal’s  interactive data files, in accordance with Rule 405(a)(2) of Regulation S-T, after allowing for the 30-day grace period for the first quarterly period in which detail tagging is required.

This Amendment No. 1 does not otherwise change or update the disclosures set forth in the Form 10-Q as originally filed and does not otherwise reflect events occurring after the original filing of the Form 10-Q.

Pursuant to Rule 406T of Regulation S-T, the interactive data files on Exhibit 101 hereto are deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, are deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and otherwise are not subject to liability under those sections.

Item  6.   Exhibits

1.1	Underwriting Agreement dated June 2, 2011 (incorporated by reference to Exhibit 1.1 to the registrant’s Current Report on Form 8-K filed on June 8, 2011). *
2.1	Agreement and Plan of Merger, dated as of May 2, 2011, by and among Arch Coal, Inc., Atlas Acquisition Corp. and International Coal Group, Inc. (incorporated herein by reference to Exhibit 2.1 to the registrant’s Current Report on Form 8-K filed on May 3, 2011). *
4.1	Indenture, dated as of June 14, 2011, by and among Arch Coal, Inc., the subsidiary guarantors named therein and UMB Bank National Association, as trustee (incorporated herein by reference to Exhibit 4.1 to the registrant’s Current Report on Form 8-K filed on June 14, 2011). *
4.2	Form of 7.000% Senior Note due 2019 (incorporated herein by reference to Exhibit 4.2 to the registrant’s Current Report on Form 8-K filed on June 14, 2011). *
4.3	Form of 7.250% Senior Note due 2020 (incorporated herein by reference to Exhibit 4.3 to the registrant’s Current Report on Form 8-K filed on June 14, 2011). *
4.4	Registration Rights Agreement, dated as of June 14, 2011, by and among Arch Coal, Inc., the subsidiary guarantors named therein, Morgan Stanley & Co. LLC, PNC Capital Markets LLC, Merrill Lynch, Pierce, Fenner & Smith Incorporated, RBS Securities Inc. and Citigroup Global Markets Inc. as representatives of the initial purchasers named therein (incorporated herein by reference to Exhibit 4.4 to the registrant’s Current Report on Form 8-K filed on June 14, 2011). *
10.1	Tender and Voting Agreement by and among Arch Coal, Inc., Atlas Acquisition Corp. and certain stockholders of International Coal Group, Inc. (incorporated herein by reference to Exhibit 10.1 to the registrant’s Current Report on Form 8-K filed on May 3, 2011). *
10.2	Tender and Voting Agreement by and among Arch Coal, Inc., Atlas Acquisition Corp. and certain stockholders of International Coal Group, Inc. (incorporated herein by reference to Exhibit 10.2 to the registrant’s Current Report on Form 8-K filed on May 3, 2011). *
10.3	Debt Commitment Letter, dated as of May 2, 2011, by and among Morgan Stanley Senior Funding, Inc., PNC Bank, National Association, PNC Capital Markets LLC and Arch Coal, Inc. (incorporated herein by reference to Exhibit 10.3 to the registrant’s Current Report on Form 8-K filed on May 3, 2011). *
10.4	Amended and Restated Credit Agreement, dated as of June 14, 2011, by and among the Company, the lenders party thereto, PNC Bank, National Association, as administrative agent and Bank of America, N.A., The Royal Bank of Scotland PLC and Citibank, N.A., as co-documentation agents (incorporated herein by reference to Exhibit 10.1 to the registrant’s Current Report on Form 8-K filed on June 17, 2011). *
10.5	Second Amendment to Amended and Restated Receivables Purchase Agreement dated June 15, 2011.*
10.6	Seventh Amendment to Credit Agreement dated as of May 9, 2011. *
12.1	Computation of ratio of earnings to combined fixed charges and preference dividends. *
31.1	Rule 13a-14(a)/15d-14(a) Certification of Steven F. Leer. *
31.2	Rule 13a-14(a)/15d-14(a) Certification of John T. Drexler. *

2

32.1	Section 1350 Certification of Steven F. Leer. *
32.2	Section 1350 Certification of John T. Drexler. *
101.INS	XBRL Instance Document
101.SCH	XBRL Schema Document
101.CAL	XBRL Calculation Linkbase Document
101.DEF	XBRL Definition Linkbase Document
101.LAB	XBRL Label Linkbase Document
101.PRE	XBRL Presentation Linkbase Document

*  These exhibits were previously included or incorporated by reference in the Form 10-Q.

Signatures

Pursuant to the requirements 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.

Arch Coal, Inc.
By:
	John T. Drexler
	Senior Vice President and Chief Financial Officer
	September 8, 2011

3

EXHIBIT INDEX

1.1	Underwriting Agreement dated June 2, 2011 (incorporated by reference to Exhibit 1.1 to the registrant’s Current Report on Form 8-K filed on June 8, 2011). *
2.1	Agreement and Plan of Merger, dated as of May 2, 2011, by and among Arch Coal, Inc., Atlas Acquisition Corp. and International Coal Group, Inc. (incorporated herein by reference to Exhibit 2.1 to the registrant’s Current Report on Form 8-K filed on May 3, 2011). *
4.1	Indenture, dated as of June 14, 2011, by and among Arch Coal, Inc., the subsidiary guarantors named therein and UMB Bank National Association, as trustee (incorporated herein by reference to Exhibit 4.1 to the registrant’s Current Report on Form 8-K filed on June 14, 2011). *
4.2	Form of 7.000% Senior Note due 2019 (incorporated herein by reference to Exhibit 4.2 to the registrant’s Current Report on Form 8-K filed on June 14, 2011). *
4.3	Form of 7.250% Senior Note due 2020 (incorporated herein by reference to Exhibit 4.3 to the registrant’s Current Report on Form 8-K filed on June 14, 2011). *
4.4	Registration Rights Agreement, dated as of June 14, 2011, by and among Arch Coal, Inc., the subsidiary guarantors named therein, Morgan Stanley & Co. LLC, PNC Capital Markets LLC, Merrill Lynch, Pierce, Fenner & Smith Incorporated, RBS Securities Inc. and Citigroup Global Markets Inc. as representatives of the initial purchasers named therein (incorporated herein by reference to Exhibit 4.4 to the registrant’s Current Report on Form 8-K filed on June 14, 2011). *
10.1	Tender and Voting Agreement by and among Arch Coal, Inc., Atlas Acquisition Corp. and certain stockholders of International Coal Group, Inc. (incorporated herein by reference to Exhibit 10.1 to the registrant’s Current Report on Form 8-K filed on May 3, 2011). *
10.2	Tender and Voting Agreement by and among Arch Coal, Inc., Atlas Acquisition Corp. and certain stockholders of International Coal Group, Inc. (incorporated herein by reference to Exhibit 10.2 to the registrant’s Current Report on Form 8-K filed on May 3, 2011). *
10.3	Debt Commitment Letter, dated as of May 2, 2011, by and among Morgan Stanley Senior Funding, Inc., PNC Bank, National Association, PNC Capital Markets LLC and Arch Coal, Inc. (incorporated herein by reference to Exhibit 10.3 to the registrant’s Current Report on Form 8-K filed on May 3, 2011). *
10.4	Amended and Restated Credit Agreement, dated as of June 14, 2011, by and among the Company, the lenders party thereto, PNC Bank, National Association, as administrative agent and Bank of America, N.A., The Royal Bank of Scotland PLC and Citibank, N.A., as co-documentation agents (incorporated herein by reference to Exhibit 10.1 to the registrant’s Current Report on Form 8-K filed on June 17, 2011). *
10.5	Second Amendment to Amended and Restated Receivables Purchase Agreement dated June 15, 2011.*
10.6	Seventh Amendment to Credit Agreement dated as of May 9, 2011. *
12.1	Computation of ratio of earnings to combined fixed charges and preference dividends. *
31.1	Rule 13a-14(a)/15d-14(a) Certification of Steven F. Leer. *
31.2	Rule 13a-14(a)/15d-14(a) Certification of John T. Drexler. *
32.1	Section 1350 Certification of Steven F. Leer. *
32.2	Section 1350 Certification of John T. Drexler. *
101.INS	XBRL Instance Document
101.SCH	XBRL Schema Document
101.CAL	XBRL Calculation Linkbase Document
101.DEF	XBRL Definition Linkbase Document
101.LAB	XBRL Label Linkbase Document
101.PRE	XBRL Presentation Linkbase Document

*  These exhibits were previously included or incorporated by reference in Arch Coal, Inc.’s Quarterly Report on Form10-Q for the quarterly period ended June 30, 2011, filed with the Securities and Exchange Commission on August 9, 2011.

4

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Derivatives (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended														6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 One Year from Balance Sheet Date [Member] Coal [Member]	Jun. 30, 2011 One Year from Balance Sheet Date [Member] Coal [Member] Coal Purchases [Member]	Jun. 30, 2011 More than One and within Two Years from Balance Sheet Date [Member] Coal [Member]	Jun. 30, 2011 More than One and within Two Years from Balance Sheet Date [Member] Coal [Member] Coal Purchases [Member]	Jun. 30, 2011 More than Two and within Three Years from Balance Sheet Date [Member] Coal [Member]	Jun. 30, 2011 More than Three and within Four Years from Balance Sheet Date [Member] Coal [Member]	Jun. 30, 2011 More than Four and within Five Years from Balance Sheet Date [Member] Coal [Member]	Jun. 30, 2011 Heating Oil [Member]	Jun. 30, 2011 Current Assets [Member]	Dec. 31, 2010 Current Assets [Member]	Jun. 30, 2011 Year One [Member]	Jun. 30, 2011 Year Two [Member]	Jun. 30, 2011 Minimum Purchase [Member]	Jun. 30, 2011 Maximum Purchase [Member]
Gallons of diesel fuel purchased annually																	75,000,000	85,000,000
Percent of diesel purchases hedged															70.00%	41.00%
Quantities under derivative contracts					1,300,000	600,000	1,300,000	200,000	700,000	1,400,000	700,000	66,800,000
Percentage of trading portfolio realized															50.00%	50.00%
Current asset for the right to reclaim cash collateral													$ 9.2	$ 10.3
Net unrealized and realized gains (losses) related to trading portfolio	(2.3)	(1.1)	0.5	(2.1)
Gain on derivative contracts designated as hedge instruments in cash flow hedges to be reclassified from OCI into earnings during the next twelve months	$ 17.9		$ 17.9

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Condensed Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 82,345	$ 93,593
Restricted cash	350,966
Trade accounts receivable	335,052	208,060
Other receivables	91,064	44,260
Inventories	350,201	235,616
Prepaid royalties	38,119	33,932
Deferred income taxes	7,015
Coal derivative assets	12,780	15,191
Other	121,123	104,262
Total current assets	1,388,665	734,914
Property, plant and equipment, net	7,726,456	3,308,892
Other assets:
Prepaid royalties	94,382	66,525
Goodwill	539,963	114,963
Deferred income taxes		361,556
Equity investments	207,646	177,451
Other	194,333	116,468
Total other assets	1,036,324	836,963
Total assets	10,151,445	4,880,769
Current liabilities:
Accounts payable	286,437	198,216
Coal derivative liabilities	5,791	4,947
Deferred income taxes		7,775
Accrued expenses and other current liabilities	395,020	245,411
Current maturities of debt and short-term borrowings	428,610	70,997
Total current liabilities	1,115,858	527,346
Long-term debt	3,773,923	1,538,744
Asset retirement obligations	412,324	334,257
Accrued pension benefits	36,047	49,154
Accrued postretirement benefits other than pension	87,626	37,793
Accrued workers' compensation	65,027	35,290
Deferred income taxes	863,970
Other noncurrent liabilities	258,261	110,234
Total liabilities	6,613,036	2,632,818
Redeemable noncontrolling interest	11,032	10,444
Stockholders' equity:
Common stock, $0.01 par value, authorized 260,000 shares, issued 212,312 shares and 164,117 shares, respectively	2,127	1,645
Paid-in capital	2,991,550	1,734,709
Treasury stock, 1,512 shares at June 30, 2011 and December 31, 2010, at cost	(53,848)	(53,848)
Retained earnings	593,896	561,418
Accumulated other comprehensive loss	(6,348)	(6,417)
Total stockholders' equity	3,527,377	2,237,507
Total liabilities and stockholders' equity	$ 10,151,445	$ 4,880,769

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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data	Jun. 30, 2011	Dec. 31, 2010
Stockholders' equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	260,000	260,000
Additional common stock, shares issued	212,312	164,117
Treasury stock, shares	1,512	1,512

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Derivatives (Effects Of Derivatives On Measures Of Financial Performance) (Details) (USD $) In Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Gain (Loss) Recognized in OCI (Effective Portion)	$ (4,896)		$ (8,642)		$ 9,892		$ (8,129)
Gains (Losses) Reclassified from OCI into Income (Effective Portion)	6,891		724		10,148		(1,970)
Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Coal [Member] | Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net [Member]
Derivatives Not Designated as Hedging Instruments, Losses, Unrealized	(374)	[1]	(3,466)	[1]	(1,419)	[1]	(8,388)	[1]
Coal [Member] | Other Operating Income, Net [Member]
Derivatives Not Designated as Hedging Instruments, Gain, Realized	147	[2]	1,252	[2]	147	[2]	2,852	[2]
Heating Oil [Member]
Gain (Loss) Recognized in OCI (Effective Portion)	(6,337)		(8,572)		7,921		(8,560)
Gains (Losses) Reclassified from OCI into Income (Effective Portion)	6,654	[3]	1,925	[3]	9,824	[3]	(304)	[3]
Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Coal Purchases [Member]
Gain (Loss) Recognized in OCI (Effective Portion)	97		7,167		(779)		8,069
Gains (Losses) Reclassified from OCI into Income (Effective Portion)		[3]		[3]		[3]	(336)	[3]
Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Coal Sales [Member]
Gain (Loss) Recognized in OCI (Effective Portion)	1,344		(7,237)		2,750		(7,638)
Gains (Losses) Reclassified from OCI into Income (Effective Portion)	237	[4]	(1,201)	[4]	324	[4]	(1,330)	[4]
Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)

[1] Change in fair value of coal derivatives and coal trading activities, net

[2] Other operating income, net

[3] Cost of coal sales

[4] Coal sales

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Segment Information

6 Months Ended

Jun. 30, 2011

Segment Information

Segment Information

18. Segment Information

The Company has three reportable business segments, which are based on the major coal producing basins in which the Company operates. Each of these reportable business segments includes a number of mine complexes. The Company manages its coal sales by coal basin, not by individual mine complex. Geology, coal transportation routes to customers, regulatory environments and coal quality are characteristic to a basin. Accordingly, market and contract pricing have developed by coal basin. Mine operations are evaluated based on their per-ton operating costs (defined as including all mining costs but excluding pass-through transportation expenses), as well as on other non-financial measures, such as safety and environmental performance. The Company's reportable segments are the Powder River Basin (PRB) segment, with operations in Wyoming; the Western Bituminous (WBIT) segment, with operations in Utah, Colorado and southern Wyoming; the Appalachia (APP) segment, with operations in West Virginia, Kentucky, Maryland and Virginia.  The Appalachia segment includes the acquired ICG operations in Appalachia, as well as the Company's previous Central Appalachia segment. The "Other" operating segment represents primarily the Company's Illinois operations and ADDCAR subsidiary, which manufactures and sells its patented highwall mining system.

Operating segment results for the three and six months ended June 30, 2011 and 2010 are presented below. Results for the reportable segments include all direct costs of mining, including all depreciation, depletion and amortization related to the mining operations, even if the assets are not recorded at the operating segment level. See discussion of segment assets below. Corporate, Other and Eliminations includes the change in fair value of coal derivatives and coal trading activities, net; corporate overhead; land management; other support functions; and the elimination of intercompany transactions.

The asset amounts below represent an allocation of assets used in the segments' cash-generating activities. The amounts in Corporate, Other and Eliminations represent primarily corporate assets (cash, receivables, investments, plant, property and equipment) as well as unassigned coal reserves, above-market acquired sales contracts and other unassigned assets.

	PRB		APP			WBIT		OtherOperatingSegments		Corporate,Other andEliminations			Consolidated
	(In thousands)
Three months ended June 30, 2011
Coal sales	$	391,413	$	400,792		$	189,154	$	3,728	$	—		$	985,087
Income from operations	35,615		97,876			43,672		317		(74,663		)	102,817
Depreciation, depletion and amortization	41,165		31,025			22,099		605		289			95,183
Amortization of acquired sales contracts, net	5,603		(4,123		)	—		9		—			1,489
Capital expenditures	15,647		29,288			10,115		4,328		9,636			69,014
Three months ended June 30, 2010
Coal sales	$	370,499	$	261,646		$	132,150	$	—	$	—		$	764,295
Income from operations	33,177		54,079			13,876		—		5,367			106,499
Depreciation, depletion and amortization	44,433		24,581			18,390		—		355			87,759
Amortization of acquired sales contracts, net	5,214		—			—		—		—			5,214
Capital expenditures	3,725		12,972			20,703		—		102,583			139,983
Six months ended June 30, 2011
Coal sales	$	784,526	$	725,178		$	344,593	$	3,728	$	—		$	1,858,025
Income from operations	82,489		152,270			70,564		317		(100,585		)	205,055
Total assets	2,212,818		5,208,551			679,231		217,765		1,833,080			10,151,445
Depreciation, depletion and amortization	82,856		52,041			42,628		605		590			178,720
Amortization of acquired sales contracts, net	11,547		(4,123		)	—		9		—			7,433
Capital expenditures	18,485		46,590			21,892		4,373		16,385			107,725
Six months ended June 30, 2010
Coal sales	$	729,914	$	481,392		$	264,863	$	—	$	—		$	1,476,169
Income from operations	49,738		91,672			26,306		—		(29,017		)	138,699
Total assets	2,331,449		725,588			682,565		—		1,150,938			4,890,540
Depreciation, depletion and amortization	89,054		47,755			38,760		—		709			176,278
Amortization of acquired sales contracts, net	15,967		—			—		—		—			15,967
Capital expenditures	4,450		24,609			33,804		—		109,095			171,958

A reconciliation of segment income from operations to consolidated income before income taxes follows:

	Three Months Ended June 30						Six Months Ended June 30
	2011			2010			2011			2010
	(In thousands)						(In thousands)
Income from operations	$	102,817		$	106,499		$	205,055		$	138,699
Interest expense	(42,249		)	(35,125		)	(76,829		)	(70,208		)
Interest income	755			623			1,501			961
Bridge financing costs related to ICG	(49,490		)	—			(49,490		)	—
Net loss resulting from early retirement of ICG debt	(250		)	—			(250		)	—
Income before income taxes	$	11,583		$	71,997		$	79,987		$	69,452

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Document And Entity Information	6 Months Ended
	Jun. 30, 2011	Aug. 04, 2011
Document and Entity Information
Entity Registrant Name	ARCH COAL INC
Entity Central Index Key	0001037676
Document Type	10-Q
Document Period End Date	Jun. 30, 2011
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		213,081,699

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Investments (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 Millennium [Member]	Jan. 31, 2011 Millennium [Member]
Ownership interest				38.00%
Future development costs, maximum limit	$ 70,900,000
Equity investments	$ 207,646,000	$ 177,451,000	$ 24,683,000	$ 25,000,000

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Debt (Tables)

6 Months Ended

Jun. 30, 2011

Debt

Debt

	June 30, 2011		December 31, 2010
	(In thousands)
Commercial paper	$	—	$	56,904
7.00% senior notes due June 15, 2019 at par	1,000,000		—
7.25% senior notes due June 15, 2021 at par	1,000,000		—
Indebtedness to banks under credit facilities	360,000		—
9.125% senior notes ($200.0 million face value) due April 1, 2018	250,000		—
4.00% convertible senior notes ($16.5 million face value) due April 1, 2017	42,902		—
9.00% convertible senior notes ($18 thousand face value) due August 1, 2012	44		—
6.75% senior notes ($450.0 million face value) due July 1, 2013	451,294		451,618
8.75% senior notes ($600.0 million face value) due August 1, 2016	588,029		587,126
7.25% senior notes due October 1, 2020 at par	500,000		500,000
Other	10,264		14,093
	4,202,533		1,609,741
Less current maturities of debt and short-term borrowings	428,610		70,997
Long-term debt	$	3,773,923	$	1,538,744

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Acquired Sales Contracts (Schedule Of Acquired Sales Contracts) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Coal supply agreement asset	$ 60,118	$ 32,077
Coal supply agreement obligation liability	(139,198)	(26,041)
Net total	(79,080)	6,036
Current Asset [Member]
Coal supply agreement asset	35,496	25,063
Other Assets [Member]
Coal supply agreement asset	24,622	7,014
Accrued Expenses And Other Current Liabilities [Member]
Coal supply agreement obligation liability	(80,411)	(5,615)
Other Noncurrent Liabilities [Member]
Coal supply agreement obligation liability	$ (58,787)	$ (20,426)

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Investments

6 Months Ended

Jun. 30, 2011

Investments

Investments

7. Investments

	Knight Hawk			DKRW			DTA			Tenaska			Millennium			Total
	(In thousands)
Balance at December 31, 2010	$	131,250		$	21,961		$	14,472		$	9,768		$	—		$	177,451
Investments in affiliates	—			—			2,910			5,500			25,570			33,980
Advances to (distributions from) affiliates, net	(9,591		)	—			—			—			—			(9,591		)
Equity in comprehensive income (loss)	9,981			(1,079		)	(2,207		)	(2		)	(887		)	5,806
Balance at June 30, 2011	$	131,640		$	20,882		$	15,175		$	15,266		$	24,683		$	207,646
Notes receivable from investees:
Balance at December 31, 2010	$	1,700		$	18,100		$	—		$	4,100		$	—		$	23,900
Balance at June 30, 2011	—			24,700			—			4,600			—			29,300

In January 2011, the Company purchased a 38% ownership interest in Millennium Bulk Terminals-Longview, LLC ("Millennium"), the owner of a brownfield bulk commodity terminal on the Columbia River near Longview, Washington, for $25.0 million, plus additional future consideration upon the completion of certain project milestones. Millennium continues to work on obtaining the required approvals and necessary permits to complete dredging and other upgrades to enable coal, alumina and cementitious materialshipments through the terminal. The Company will control 38% of the terminal's throughput and storage capacity, in order to facilitate export shipments of coal off the west coast of the United States.

The Company may be required to make future contingent payments of up to $70.9 million related to development financing for certain of its equity investees. The Company's obligation to make these payments, as well as the timing of any payments required, is contingent upon a number of factors, including project development progress, receipt of permits and construction financing.

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Acquired Sales Contracts (Tables)

6 Months Ended

Jun. 30, 2011

Acquired Sales Contracts

Schedule Of Acquired Sales Contract

	June 30, 2011			December 31, 2010
	(In thousands)
Location in Balance Sheet
Other current assets	$	35,496		$	25,063
Other assets	24,622			7,014
Total	60,118			32,077
Accrued expenses and other current liabilities	(80,411		)	(5,615		)
Other noncurrent liabilities	(58,787		)	(20,426		)
Total	(139,198		)	(26,041		)
Net total	$	(79,080	)	$	6,036

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Equity Offering (Details) (USD $) Share data in Millions, except Per Share data	0 Months Ended		6 Months Ended
	Jul. 08, 2011	Jun. 08, 2011	Jun. 30, 2011
Equity Offering
Number of shares sold	0.7	48.0	48.0
Common stock, public offering price		$ 27.00
Proceeds from the sale of common stock		$ 1,250,000	$ 1,249,407,000
Proceeds from shares issued for underwriters' over-allotments	$ 18,400,000

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Basis Of Presentation (Details)	6 Months Ended
	Jun. 30, 2011
Basis Of Presentation
Company's membership interest percentage in joint venture	99.00%
Number of mining complexes operated	24

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Business Combination (Tables)

6 Months Ended

Jun. 30, 2011

Business Combination

Summary Of Purchase Price Allocation

	(in millions)
Consideration paid, net of cash acquired	$	2,910.4
Recognized amounts of net tangible and intangible assets acquired and liabilities assumed:
Restricted cash	15.5
Receivables	114.2
Inventories	77.5
Net property, plant and equipment, including mineral rights	4,516.4
Goodwill	425.0
Other assets	49.2
Accounts payable	(82.4		)
Other accrued expenses and current liabilities	(53.0		)
Executive change in control payments	(10.0		)
Debt	(604.8		)
Litigation accrual	(105.3		)
Accrued postretirement benefits	(49.4		)
Asset retirement obligation	(80.4		)
Coal supply agreements, net	(77.7		)
Deferred income taxes, net	(1,189.9		)
Other	(34.5		)
Net tangible and intangible assets acquired	$	2,910.4

Summary Of Unaudited Pro Forma

	Three Months Ended June 30					Six Months Ended June 30
	2011		2010			2011		2010
	((In thousands)
Total revenues
As reported	$	985.1	$	764.3		$	1,858.0	$	1,476.2
Pro forma	$	1,233.9	$	1,044.0		$	2,397.7	$	2,035.8
Income (loss) before income taxes
As reported	$	11.6	$	72.0		$	80.0	$	69.5
Pro forma	$	62.0	$	(67.8	)	$	74.9	$	(86.2	)

Schedule of Business Acquisition, Integration, Restructuring and Other Related Costs

Costs of affecting the acquisition - Arch	$	27,852
Costs of affecting the acquisition - ICG	23,503
Severance costs	13,498
Write off of acquired assets	7,316
Bridge financing fees	49,490
	$	121,659

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Workers' Compensation Expense

6 Months Ended

Jun. 30, 2011

Workers' Compensation Expense

Workers' Compensation Expense

12. Workers' Compensation Expense

The following table details the components of workers' compensation expense:

	Three Months Ended June 30						Six Months Ended June 30
	2011			2010			2011			2010
	(In thousands)						(In thousands)
Self-insured occupational disease benefits:
Service cost	$	246		$	208		$	439		$	363
Interest cost	304			194			558			338
Net amortization	(160		)	(382		)	(261		)	(930		)
Total occupational disease	390			20			736			(229		)
Traumatic injury claims and assessments	3,324			2,244			5,649			3,920
Total workers' compensation expense	$	3,714		$	2,264		$	6,385		$	3,691

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Business Combination

6 Months Ended

Jun. 30, 2011

Business Combination

Business Combination

3. Business Combination

On June 15, 2011, the Company completed its acquisition of ICG, a leading coal producer, operating 12 mining complexes in Appalachia and one complex in the Illinois basin.  In addition, a mine is currently under development in Appalachia.  The Company acquired all of ICG's outstanding shares of common stock for $3.1 billion. To finance the acquisition, the Company received net proceeds of $1.25 billion from the sale of 48.0 million shares of its common stock and issued $2.0 billion in aggregate principal amount of senior unsecured notes.  See Note 4, "Equity Offering" and Note 5, "Debt and Financing Arrangements" for further information about these transactions.

The Company has not finalized the determination of the fair values of the assets acquired and liabilities assumed in the acquisition.  The following table summarizes the consideration paid for ICG and the estimated amounts of assets acquired and liabilities assumed that were recognized at the acquisition date:

	(in millions)
Consideration paid, net of cash acquired	$	2,910.4
Recognized amounts of net tangible and intangible assets acquired and liabilities assumed:
Restricted cash	15.5
Receivables	114.2
Inventories	77.5
Net property, plant and equipment, including mineral rights	4,516.4
Goodwill	425.0
Other assets	49.2
Accounts payable	(82.4		)
Other accrued expenses and current liabilities	(53.0		)
Executive change in control payments	(10.0		)
Debt	(604.8		)
Litigation accrual	(105.3		)
Accrued postretirement benefits	(49.4		)
Asset retirement obligation	(80.4		)
Coal supply agreements, net	(77.7		)
Deferred income taxes, net	(1,189.9		)
Other	(34.5		)
Net tangible and intangible assets acquired	$	2,910.4

Because the Company's valuation efforts are ongoing, the preliminary fair values above could change substantially.  Notably, the assigned value of goodwill was calculated as the present value of the estimated synergies from the acquisition and the fair value of the coal reserves acquired has not yet been determined and will involve estimating the amounts and timing of cash flows from the properties acquired.

The allocation of goodwill to reporting units will not be completed until the valuation process is completed.  Any goodwill related to the acquisition is not expected to be deductible for tax purposes.

The revenues and income before income taxes related to the acquired operations that have been included in the consolidated statements of income since the date of acquisition were $48.0 million and $11.9 million, respectively.

The following unaudited pro forma information has been prepared for illustrative purposes and assumes that the business combination occurred on January 1, 2010.  The unaudited pro forma results have been prepared based upon ICG's historical results and estimates of the ongoing effects of the transactions that the Company believes are reasonable and supportable.  The results are not necessarily reflective of the consolidated results of operations had the acquisition actually occurred on January 1, 2010, nor are they indicative of future operating results.

The unaudited supplemental pro forma financial information of the combined entity follows:

	Three Months Ended June 30					Six Months Ended June 30
	2011		2010			2011		2010
	((In thousands)
Total revenues
As reported	$	985.1	$	764.3		$	1,858.0	$	1,476.2
Pro forma	$	1,233.9	$	1,044.0		$	2,397.7	$	2,035.8
Income (loss) before income taxes
As reported	$	11.6	$	72.0		$	80.0	$	69.5
Pro forma	$	62.0	$	(67.8	)	$	74.9	$	(86.2	)

The pro forma income before income taxes reflects adjustments to depreciation, depletion and amortization for the new basis in assets acquired and interest expense to reflect the debt incurred to finance the acquisition.  In addition, the following costs and expenses reflected in the income before income taxes for the six month period ended June 30, 2011 reported in the condensed consolidated statement of operations are reversed out of 2011 and reflected in 2010 in the pro forma results.

Costs of affecting the acquisition - Arch	$	27,852
Costs of affecting the acquisition - ICG	23,503
Severance costs	13,498
Write off of acquired assets	7,316
Bridge financing fees	49,490
	$	121,659

Severance costs represent both change in control payments to executives and severance for employees terminated after the acquisition.  Additional severance costs of $3.4 million are expected to be incurred in the remainder of 2011.  The acquired asset write-off relates to a preparation plant and loadout of an acquired ICG mining operation.  The acquired operation has been combined with an existing operation of the Company, and will utilize an existing facility.

Anticipated synergies are not reflected in the pro forma results.

In conjunction with the acquisition, the Company has $351.0 million of restricted cash at June 30, 2011 to discharge the Company's obligation under certain ICG debt, to provide collateral for ICG letters of credit until they can be eliminated or replaced and to fund executive change in control payments.  See further discussion of the ICG debt in Note 5, "Debt."

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Earnings per Common Share (Tables)

6 Months Ended

Jun. 30, 2011

Earnings Per Common Share

Earnings per Share

	Three Months Ended June 30		Six Months Ended June 30
	2011	2010	2011	2010
	(In thousands)		(In thousands)
Weighted average shares outstanding:
Basic weighted average shares outstanding	174,244	162,388	168,442	162,380
Effect of common stock equivalents under incentive plans	1,028	742	1,112	725
Diluted weighted average shares outstanding	175,272	163,130	169,554	163,105

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Inventories

6 Months Ended

Jun. 30, 2011

Inventories

Inventories

9. Inventories

Inventories consist of the following:

	June 30, 2011		December 31, 2010
	(In thousands)
Coal	$	189,989	$	115,647
Repair parts and supplies, net of allowance	160,212		119,969
	$	350,201	$	235,616

The repair parts and supplies are stated net of an allowance for slow-moving and obsolete inventories of $13.1 million at June 30, 2011, and $12.7 million at December 31, 2010.

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Comprehensive Income

6 Months Ended

Jun. 30, 2011

Comprehensive Income

Comprehensive Income

14. Comprehensive Income

Comprehensive income consists of net income and other comprehensive income. Other comprehensive income items are transactions recorded in stockholders' equity during the year, excluding net income and transactions with stockholders.

The following table presents the components of comprehensive income:

	Three Months Ended June 30						Six Months Ended June 30
	2011			2010			2011			2010
	(In thousands)						(In thousands)
Net income attributable to Arch Coal, Inc.	$	11,079		$	66,156		$	66,680		$	64,360
Other comprehensive income, net of income taxes:
Pension, postretirement and other post-employment benefits, reclassifications into net income	293			(536		)	866			56
Unrealized losses on available-for-sale securities	(1,434		)	(925		)	(687		)	(916		)
Unrealized gains and losses on derivatives, net of reclassifications into net income:
Unrealized gains (losses) on derivatives	(3,127		)	(5,451		)	6,374			(5,089		)
Reclassifications of (gains) losses into net income	(4,360		)	(506		)	(6,484		)	1,217
Total comprehensive income	$	2,451		$	58,738		$	66,749		$	59,628

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Fair Value Measurements

6 Months Ended

Jun. 30, 2011

Fair Value Measurements

Fair Value Measurements

10. Fair Value Measurements

The hierarchy of fair value measurements prioritizes the inputs to valuation techniques used to measure fair value. The levels of the hierarchy, as defined below, give the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs.

·Level 1 is defined as observable inputs such as quoted prices in active markets for identical assets. Level 1 assets include available-for-sale equity securities and coal futures that are submitted for clearing on the New York Mercantile Exchange.

·Level 2 is defined as observable inputs other than Level 1 prices. These include quoted prices for similar assets or liabilities in an active market, quoted prices for identical assets and liabilities 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. The Company's level 2 assets and liabilities include commodity contracts (coal and heating oil) with fair values derived from quoted prices in over-the-counter markets or from prices received from direct broker quotes.

·Level 3 is defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. These include the Company's commodity option contracts (primarily coal and heating oil) valued using modeling techniques, such as Black-Scholes, that require the use of inputs, particularly volatility, that are rarely observable.

The table below sets forth, by level, the Company's financial assets and liabilities that are recorded at fair value in the accompanying condensed consolidated balance sheet:

	Fair Value at June 30, 2011
	Total		Level 1		Level 2		Level 3
	(In thousands)
Assets:
Investments in equity securities	$	6,335	$	6,319	$	—	$	16
Derivatives	30,881		6,233		10,054		14,594
Total assets	$	37,216	$	12,552	$	10,054	$	14,610
Liabilities:
Derivatives	$	5,791	$	—	$	1,655	$	4,136

The Company's contracts with certain of its counterparties allow for the settlement of contracts in an asset position with contracts in a liability position in the event of default or termination. For classification purposes, the Company records the net fair value of all the positions with these counterparties as a net asset or liability. Each level in the table above displays the underlying contracts according to their classification in the accompanying condensed consolidated balance sheet, based on this counterparty netting.

The following table summarizes the change in the fair values of financial instruments categorized as level 3.

	Three Months Ended June 30, 2011			Six Months Ended June 30, 2011
	(In thousands)
Balance, beginning of period	$	15,781		$	9,183
Realized and unrealized losses recognized in earnings	(4,545		)	(7,124		)
Realized and unrealized gains (losses) recognized in other comprehensive income	(5,453		)	3,475
Purchases	9,006			10,472
Issuances	(2,160		)	(2,160		)
Settlements	(2,155		)	(3,372		)
Balance, end of period	$	10,474		$	10,474

Net unrealized losses during the three and six month periods ended June 30, 2011 related to level 3 financial instruments held on June 30, 2011 were $8.3 million and $3.5 million, respectively.

Fair Value of Long-Term Debt

At June 30, 2011 and December 31, 2010, the fair value of the Company's senior notes and other long-term debt, including amounts classified as current, was $4.3 billion and $1.7 billion, respectively. Fair values are based upon observed prices in an active market when available or from valuation models using market information.

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Workers' Compensation Expense (Tables)

6 Months Ended

Jun. 30, 2011

Workers' Compensation Expense

Workers' Compensation Expense

	Three Months Ended June 30						Six Months Ended June 30
	2011			2010			2011			2010
	(In thousands)						(In thousands)
Self-insured occupational disease benefits:
Service cost	$	246		$	208		$	439		$	363
Interest cost	304			194			558			338
Net amortization	(160		)	(382		)	(261		)	(930		)
Total occupational disease	390			20			736			(229		)
Traumatic injury claims and assessments	3,324			2,244			5,649			3,920
Total workers' compensation expense	$	3,714		$	2,264		$	6,385		$	3,691

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Derivatives

6 Months Ended

Jun. 30, 2011

Derivatives

Derivatives

8. Derivatives

The Company generally utilizes derivative financial instruments to manage exposures to commodity prices. Additionally, the Company may hold certain coal derivative financial instruments for trading purposes.

All derivative financial instruments are recognized in the balance sheet at fair value. In a fair value hedge, the Company hedges the risk of changes in the fair value of a firm commitment, typically a fixed-price coal sales contract. Changes in both the hedged firm commitment and the fair value of a derivative used as a hedge instrument in a fair value hedge are recorded in earnings. In a cash flow hedge, the Company hedges the risk of changes in future cash flows related to a forecasted purchase or sale. Changes in the fair value of the derivative instrument used as a hedge instrument in a cash flow hedge are recorded in other comprehensive income. Amounts in other comprehensive income are reclassified to earnings when the hedged transaction affects earnings and are classified in a manner consistent with the transaction being hedged. The Company formally documents the relationships between hedging instruments and the respective hedged items, as well as its risk management objectives for hedge transactions.

The Company evaluates the effectiveness of its hedging relationships both at the hedge's inception and on an ongoing basis. Any ineffective portion of the change in fair value of a derivative instrument used as a hedge instrument in a fair value or cash flow hedge is recognized immediately in earnings. The ineffective portion is based on the extent to which exact offset is not achieved between the change in fair value of the hedge instrument and the cumulative change in expected future cash flows on the hedged transaction from inception of the hedge in a cash flow hedge or the change in the fair value of the firm commitment in a fair value hedge.

Diesel fuel price risk management

The Company is exposed to price risk with respect to diesel fuel purchased for use in its operations. The Company purchases approximately 75 to 85 million gallons of diesel fuel annually in its operations. To reduce the volatility in the price of diesel fuel for its operations, the Company uses forward physical diesel purchase contracts, as well as heating oil swaps and purchased call options. At June 30, 2011, the Company had protected the price of approximately 70% of its expected purchases for the remainder of fiscal year 2011 and 41% for fiscal year 2012.

At June 30, 2011, the Company held heating oil swaps and purchased call options for approximately 66.8 million gallons for the purpose of managing the price risk associated with future diesel purchases. Since the changes in the price of heating oil highly correlate to changes in the price of the hedged diesel fuel purchases, the heating oil swaps and purchased call options qualify for cash flow hedge accounting.

Coal risk management positions

The Company may sell or purchase forward contracts, swaps and options in the over-the-counter coal market in order to manage its exposure to coal prices. The Company has exposure to the risk of fluctuating coal prices related to forecasted sales or purchases of coal or to the risk of changes in the fair value of a fixed price physical sales contract. Certain derivative contracts may be designated as hedges of these risks.

At June 30, 2011, the Company held derivatives for risk management purposes totaling 1.3 million tons of coal sales and 0.6 million tons of coal purchases that are expected to settle during the remainder of 2011, 1.3 million tons of coal sales and 0.2 million tons of coal purchases that are expected to settle in 2012, 0.7 million tons of coal sales that are expected to settle in 2013, 1.4 million tons of coal sales that are expected to settle in 2014 and 0.7 million tons of coal sales that are expected to settle in 2015.

Coal trading positions

The Company may sell or purchase forward contracts, swaps and options in the over-the-counter coal market for trading purposes. The Company is exposed to the risk of changes in coal prices on the value of its coal trading portfolio. The timing of the estimated future realization of the value of the trading portfolio is 50% for the remainder of 2011 and 50% in 2012.

Tabular derivatives disclosures

The Company's contracts with certain of its counterparties allow for the settlement of contracts in an asset position with contracts in a liability position in the event of default or termination. Such netting arrangements reduce the Company's credit exposure related to these counterparties. For classification purposes, the Company records the net fair value of all the positions with a given counterparty as a net asset or liability in the condensed consolidated balance sheets. The amounts shown in the table below represent the fair value position of individual contracts, regardless of the net position presented in the accompanying condensed consolidated balance sheets. The fair value and location of derivatives reflected in the accompanying condensed consolidated balance sheets are as follows:

Fair Value of Derivatives

(in thousands)

	June 30, 2011			December 31, 2010
	Asset Derivative	Liability Derivative		Asset Derivative	Liability Derivative
Derivatives Designated as Hedging Instruments
Heating oil	$    18,101	$            —		$    13,475	$            —
Coal	3,273	(1,924)		2,009	(2,350)
Total	21,374	(1,924)		15,484	(2,350)
Derivatives Not Designated as Hedging Instruments
Coal — held for trading purposes	18,780	(9,788)		34,445	(24,087)
Coal	1,352	(4,704)		1,139	(912)
Total	20,132	(14,492)		35,584	(24,999)
Total derivatives	41,506	(16,416)		51,068	(27,349)
Effect of counterparty netting	(10,625)	10,625		(22,402)	22,402
Net derivatives as classified in the balance sheets	$    30,881	$     (5,791)	$   25,090	$    28,666	$     (4,947)	$   23,719

Net derivatives as reflected on the balance sheets

		June 30,      2011	December 31,         2010
Heating oil	Other current assets	$   18,101	$   13,475
Coal	Coal derivative assets	12,780	15,191
	Coal derivative liabilities	(5,791)	(4,947)
		$   25,090	$   23,719

The Company had a current asset for the right to reclaim cash collateral of $9.2 million and $10.3 million at June 30, 2011 and December 31, 2010, respectively. These amounts are not included with the derivatives presented in the table above and are included in "other current assets" in the accompanying condensed consolidated balance sheets.

The effects of derivatives on measures of financial performance are as follows:

Three Months Ended June 30

(in thousands)

Derivatives used inCash Flow Hedging	Gain (Loss) Recognized in OCI (Effective Portion)						Gains (Losses) Reclassified from OCI into Income (Effective Portion)						Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Relationships	2011			2010			2011			2010			2011		2010
Heating oil	$	(6,337	)	$	(8,572	)	$	6,654	(2)	$	1,925	(2)	$	—	$	—
Coal sales	1,344			(7,237		)	237		(1)	(1,201		)(1)	—		—
Coal purchases	97			7,167			—		(2)	—		(2)	—		—
Totals	$	(4,896	)	$	(8,642	)	$	6,891		$	724		$	—	$	—

Derivatives Not Designated as	Gain (Loss)
Hedging Instruments	2011			2010
Coal — unrealized	$	(374	)(3)	$	(3,466	)(3)
Coal — realized	$	147	(4)	$	1,252	(4)

Location in Statement of Income:

(1)Coal sales

(2)        Cost of coal sales

(3)Change in fair value of coal derivatives and coal trading activities, net

(4)Other operating income, net

During the three months ended June 30, 2011 and 2010, the Company recognized net unrealized and realized losses of $2.3 million and $1.1 million, respectively, related to its trading portfolio (including derivative and non-derivative contracts). These balances are included in the caption "Change in fair value of coal derivatives and coal trading activities, net" in the accompanying condensed consolidated statements of income and are not included in the previous table.

Six Months Ended June 30

(in thousands)

Derivatives used inCash Flow Hedging	Gain (Loss) Recognized in OCI (Effective Portion)						Gains (Losses) Reclassified from OCI into Income (Effective Portion)						Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Relationships	2011			2010			2011			2010			2011		2010
Heating oil	$	7,921		$	(8,560	)	$	9,824	(2)	$	(304	)(2)	$	—	$	—
Coal sales	2,750			(7,638		)	324		(1)	(1,330		)(1)	—		—
Coal purchases	(779		)	8,069			—		(2)	(336		)(2)	—		—
Totals	$	9,892		$	(8,129	)	$	10,148		$	(1,970	)	$	—	$	—

Derivatives Not Designated as	Gain (Loss)
Hedging Instruments	2011			2010
Coal — unrealized	$	(1,419	)(3)	$	(8,388	)(3)
Coal — realized	$	147	(4)	$	2,852	(4)

Location in Statement of Income:

1-   Coal sales 

2-   Cost of coal sales

3-   Change in fair value of coal derivatives and coal trading activities, net

4-   Other operating income, net

The Company recognized net unrealized and realized gains of $0.5 million during the six months ended June 30, 2011 and net unrealized and realized losses of $2.1 million during the six months ended June 30, 2010 related to its trading portfolio (including derivative and non-derivative contracts). These balances are included in the caption "Change in fair value of coal derivatives and coal trading activities, net" in the accompanying condensed consolidated statements of income and are not included in the previous table.

During the next twelve months, based on fair values at June 30, 2011, gains on derivative contracts designated as hedge instruments in cash flow hedges of approximately $17.9 million are expected to be reclassified from other comprehensive income into earnings.

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Derivatives (Net Derivatives As Reflected On The Balance Sheets) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Derivative assets	$ 41,506	$ 51,068
Net derivatives as reflected on the balance sheet	25,090	23,719
Other Current Assets [Member] | Heating Oil [Member]
Derivative assets	18,101	13,475
Coal [Member]
Coal derivative assets	12,780	15,191
Coal derivative liabilities	$ (5,791)	$ (4,947)

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Basis Of Presentation

6 Months Ended

Jun. 30, 2011

Basis Of Presentation

Basis Of Presentation

1. Basis of Presentation

The accompanying unaudited condensed consolidated financial statements include the accounts of Arch Coal, Inc. and its subsidiaries and controlled entities (the "Company"). The Company's primary business is the production of steam and metallurgical coal from surface and underground mines located throughout the United States, for sale to utility, industrial and export markets. On June 15, 2011, the Company acquired International Coal Group, Inc. ("ICG"), as described in Note 3, "Business Combinations".  The Company operates 24 mining complexes in West Virginia, Kentucky, Maryland, Virginia, Illinois, Wyoming, Colorado and Utah. All subsidiaries (except as noted below) are wholly-owned. Intercompany transactions and accounts have been eliminated in consolidation.

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial reporting and U.S. Securities and Exchange Commission regulations. In the opinion of management, all adjustments, consisting of normal, recurring accruals considered necessary for a fair presentation, have been included. Results of operations for the three and six month periods ended June 30, 2011 are not necessarily indicative of results to be expected for the year ending December 31, 2011. These financial statements should be read in conjunction with the audited financial statements and related notes as of and for the year ended December 31, 2010 included in the Company's Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission.

The Company owns a 99% membership interest in a joint venture named Arch Western Resources, LLC ("Arch Western") which operates coal mines in Wyoming, Colorado and Utah. The Company also acts as the managing member of Arch Western.

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Equity Offering

6 Months Ended

Jun. 30, 2011

Equity Offering

Equity Offering

4.  Equity Offering

On June 8, 2011, the Company sold 48 million shares of its common stock at a public offering price of $27.00 per share.  The $1.25 million in net proceeds from the issuance were used to finance the acquisition.  On July 8, 2011, the Company issued an additional 0.7 million shares of its common stock under the same terms and conditions to cover underwriters' over-allotments for net proceeds of $18.4 million.

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Business Combination (Summary Of Acquisition Related Activities) (Details) (USD $)	6 Months Ended
	Jun. 30, 2011
Consideration paid, net of cash acquired	$ 2,910,380,000
Restricted cash	15,500,000
Receivables	114,200,000
Inventories	77,500,000
Net property, plant and equipment, including mineral rights	4,516,400,000
Goodwill	425,000,000
Other assets	49,200,000
Accounts Payable	(82,400,000)
Other accrued expenses and current liabilities	(53,000,000)
Executive change in control payments	(10,000,000)
Debt	(604,800,000)
Litigation accrual	(105,300,000)
Accrued postretirement benefits	(49,400,000)
Asset retirement obligation	(80,400,000)
Deferred income taxes, net	(1,189,900,000)
Net tangible and intangible assets acquired	2,910,400,000
Other noncurrent liabilities	(34,500,000)
Coal Supply Agreement [Member]
Coal supply agreements, net	$ (77,700,000)

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2011

Fair Value Measurements

Summary Of Financial Assets And Liabilities Accounted For At Fair Value

	Fair Value at June 30, 2011
	Total		Level 1		Level 2		Level 3
	(In thousands)
Assets:
Investments in equity securities	$	6,335	$	6,319	$	—	$	16
Derivatives	30,881		6,233		10,054		14,594
Total assets	$	37,216	$	12,552	$	10,054	$	14,610
Liabilities:
Derivatives	$	5,791	$	—	$	1,655	$	4,136

Summary Of Change In The Fair Values Of Financial Instruments Categorized As Level 3

	Three Months Ended June 30, 2011			Six Months Ended June 30, 2011
	(In thousands)
Balance, beginning of period	$	15,781		$	9,183
Realized and unrealized losses recognized in earnings	(4,545		)	(7,124		)
Realized and unrealized gains (losses) recognized in other comprehensive income	(5,453		)	3,475
Purchases	9,006			10,472
Issuances	(2,160		)	(2,160		)
Settlements	(2,155		)	(3,372		)
Balance, end of period	$	10,474		$	10,474

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Stock-Based Compensation And Other Incentive Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Options issued during period			700,000
Weighted average exercise price of options granted	$ 32.50		$ 32.50
Common stock issuable under option granted, weighted average grant date fair value			$ 14.38
Option, weighted average risk free rate			1.95%
Option, weighted average dividend yield			1.23%
Option, weighted average volatility			57.61%
Compensation expense recognition period			3
Amounts unpaid for all grants	$ 8.6		$ 8.6		$ 6.4
Allocated stock-based compensation expense	$ 2.4	$ 5.0	$ 9.2	$ 8.8
Stock Option [Member]
Vesting period of option (Years)			4.5
Share based awards vesting period			three
Restricted Stock [Member]
Shares granted during the period			107,700
Weighted average grant-date fair value			$ 32.49
Share based awards vesting period			three
Performance Units [Member]
Shares granted during the period			3,400,000

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Employee Benefit Plans (Pension And Other Postretirement Benefit Costs) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Pension Plans, Defined Benefit [Member]
Service cost	$ 3,926	$ 4,062	$ 8,245	$ 7,935
Interest cost	3,996	3,790	8,127	7,911
Expected return on plan assets	(5,438)	(5,530)	(10,906)	(9,696)
Amortization of prior service cost (credit)	(142)	43	(95)	86
Amortization of other actuarial (gains) losses	2,235	1,161	4,374	3,566
Net benefit cost (credit)	4,577	3,526	9,745	9,802
Other Postretirement Benefit Plans, Defined Benefit [Member]
Service cost	518	308	923	754
Interest cost	529	394	1,027	1,042
Amortization of prior service cost (credit)	(546)	(679)	(1,137)	(1,182)
Amortization of other actuarial (gains) losses	(952)	(989)	(1,550)	(1,459)
Net benefit cost (credit)	$ (451)	$ (966)	$ (737)	$ (845)

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Derivatives (Disclosure Of Fair Value Of Derivatives) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Derivative Assets	$ 41,506	$ 51,068
Derivative Liabilities	(16,416)	(27,349)
Effect of counterparty netting in derivative assets	(10,625)	(22,402)
Effect of counterparty netting in derivative liabilities	10,625	22,402
Net derivative assets as classified in the balance sheet	30,881	28,666
Net derivative liabilities as classified in the balance sheet	(5,791)	(4,947)
Net derivatives as classified in the balance sheet	25,090	23,719
Coal [Member] | Designated as Hedging Instrument [Member]
Derivative Assets	3,273	2,009
Derivative Liabilities	(1,924)	(2,350)
Designated as Hedging Instrument [Member]
Derivative Assets	21,374	15,484
Derivative Liabilities	(1,924)	(2,350)
Designated as Hedging Instrument [Member] | Heating Oil [Member]
Derivative Assets	18,101	13,475
Derivative Liabilities
Coal [Member] | Not Designated as Hedging Instrument [Member]
Derivative Assets	1,352	1,139
Derivative Liabilities	(4,704)	(912)
Not Designated as Hedging Instrument [Member]
Derivative Assets	20,132	35,584
Derivative Liabilities	(14,492)	(24,999)
Not Designated as Hedging Instrument [Member] | Coal Held for Trading Purposes [Member]
Derivative Assets	18,780	34,445
Derivative Liabilities	$ (9,788)	$ (24,087)

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Contingencies (Details) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011
Purchase replacement coal	$ 100
Damages and interest awarded	104.1
Accrued amount of fair value of the judgment at the acquisition date	104.1
Maximum [Member]
Aggregate amount of past and future damages	377.0
Minimum [Member]
Aggregate amount of past and future damages	$ 228.0

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Debt

6 Months Ended

Jun. 30, 2011

Debt

Debt

5.  Debt

	June 30, 2011		December 31, 2010
	(In thousands)
Commercial paper	$	—	$	56,904
7.00% senior notes due June 15, 2019 at par	1,000,000		—
7.25% senior notes due June 15, 2021 at par	1,000,000		—
Indebtedness to banks under credit facilities	360,000		—
9.125% senior notes ($200.0 million face value) due April 1, 2018	250,000		—
4.00% convertible senior notes ($16.5 million face value) due April 1, 2017	42,902		—
9.00% convertible senior notes ($18 thousand face value) due August 1, 2012	44		—
6.75% senior notes ($450.0 million face value) due July 1, 2013	451,294		451,618
8.75% senior notes ($600.0 million face value) due August 1, 2016	588,029		587,126
7.25% senior notes due October 1, 2020 at par	500,000		500,000
Other	10,264		14,093
	4,202,533		1,609,741
Less current maturities of debt and short-term borrowings	428,610		70,997
Long-term debt	$	3,773,923	$	1,538,744

The current maturities of debt include contractual maturities, as well as amounts borrowed that are supported by credit facilities that have a term of less than one year and amounts borrowed under credit facilities with terms longer than one year that the Company does not intend to refinance on a long-term basis, based on cash projections and management's plans. In addition, the current maturities at June 30, 2011 include the ICG debt that the Company redeemed in the third quarter.  See further discussion in "ICG Debt" below.

2019 and 2021 Senior Notes

On June 14, 2011, the Company entered into an indenture in conjunction with the issuance of the 7.00% senior notes due 2019 ("2019 Notes") and the 7.25% senior notes due 2021 ("2021 Notes") as discussed in Note 3, "Business Combinations." Interest is payable on the 2019 Notes and 2021 Notes on June 15 and December 15 of each year, commencing December 15, 2011.

At any time prior to June 15, 2014, the Company may redeem up to 35% of the aggregate principal amount of each of the 2019 Notes and 2021 Notes, plus accrued and unpaid interest, with the net proceeds from certain equity offerings. The Company may redeem the 2019 Notes prior to June 15, 2015 and the 2021 Notes prior to June 15, 2016 at the respective make-whole prices set forth in the indenture. On or after June 15, 2015, the Company may redeem the 2019 Notes for cash at redemption prices, reflected as a percentage of the principal amount, of: 103.5% from June 15, 2015 through June 14, 2016; 101.75% from June 15, 2016 through June 14, 2017; and 100% beginning on June 15, 2017.  On or after June 15, 2016, the Company may redeem the 2021 Notes for cash at redemption prices, reflected as a percentage of the principal amount, of: 103.625% from June 15, 2016 through June 14, 2017; 102.417% from June 15, 2017 through June 14, 2018; 101.208% from June 15, 2018 through June 14, 2019 and 100% beginning on June 15, 2019. In each case, accrued and unpaid interest at the redemption date is due upon redemption. Upon a change in control, the Company is required to make a tender offer for both series of notes at a price of 101% of the principal amount.

The 2019 Notes and 2021 Notes are guaranteed by substantially all of the Company's subsidiaries, including the newly acquired subsidiaries of ICG and excluding Arch Western, its subsidiaries and Arch Receivable Company, LLC. The Company incurred financing fees of $44.2 million related to the issuance of these notes.

The Company and the guarantor subsidiaries entered into a registration rights agreement (the "Registration Rights Agreement") in connection with the 2019 Notes and 2021 Notes. Pursuant to the Registration Rights Agreement, the Company and the guarantor subsidiaries agreed to file a registration statement with the Securities and Exchange Commission to exchange a like aggregate principal amount of senior notes identical in all material respects to the 2019 Notes and 2021 Notes. Pursuant to the Registration Rights Agreement, the Company must make reasonable best efforts to cause the registration statement to become effective by June 13, 2012. Should those events not occur within the specified time frame, the interest rate shall be increased by one-quarter of one percent per annum for the first 90 days following such period. Such interest rate will increase by an additional one-quarter of one percent per annum thereafter up to a maximum aggregate increase of one percent per annum. Once any of the required events occur, the interest rate will revert to the rate specified in the indenture.

ICG Debt

Upon the closing of the ICG acquisition, the Company gave a 30-day redemption notice to the Trustee of ICG's 9.125% senior notes and legally discharged our obligation under the 9.125% senior notes by depositing the funds to redeem the debt with the Trustee. The $260.7 million balance deposited is reflected in restricted cash on the accompanying condensed consolidated balance sheet at June 30, 2011.  On July 14, 2011, all of the outstanding 9.125% senior notes were redeemed at an aggregate price of $251.4 million, including the required make-whole premium, plus accrued interest of $5.2 million.

At the acquisition date, ICG's 4.00% convertible senior notes with a fair value of $298.5 million and 9.00% convertible senior notes with a fair value of $1.7 million ("convertible notes") became convertible into cash, pursuant to the amended indentures governing the convertible notes, at a calculated conversion rate of $2,614.6848 for each $1,000 in principal amount surrendered for conversion for the 4.00% convertible notes and $2,392.73414 for the 9.00% convertible notes.  As of July 31, 2011, the aggregate conversion value of the remaining convertible notes outstanding was $4.5 million.

Other ICG debt, with a fair value of approximately $54.0 million at the acquisition date, consisted mainly of individually insignificant equipment notes and insurance notes payable. The remaining balance of other ICG debt was $5.2 million at June 30, 2011.

The Company recognized a net loss of approximately $0.3 million on the early extinguishment of ICG's debt, including the conversions of the 4.00% and 9.00% convertible notes described above.

Credit Facilities and Commercial Paper

On June 14, 2011, the Company amended and restated its secured credit facility to allow for up to $2.0 billion in borrowings.   Borrowings under this credit facility bear interest at a floating rate based on LIBOR determined by reference to the Company's leverage ratio, as calculated in accordance with the credit agreement.  The credit facility has a five-year term that expires on June 14, 2016 and is secured by substantially all of the Company's assets as well as its ownership interests in substantially all of its subsidiaries, excluding its ownership interests in Arch Western and its subsidiaries. Commitment fees of 0.50% per annum are payable on the average unused daily balance of the revolving credit facility. The Company paid and deferred $20.7 million in financing fees related to the amendment of this agreement.  Financial covenant requirements may restrict the amount of unused capacity available to the Company for borrowings and letters of credit.

On June 14, 2011, the Company terminated its commercial paper placement program and the supporting credit facility.

Availability

As of June 30, 2011 the Company had $360.0 million of borrowings outstanding under the amended revolving credit facility.  The revolving credit facility contains customary financial covenants that limit the Company's total debt based on defined earnings measurements.   As of June 30, 2011, the Company had availability of approximately $1.1 billion under all lines of credit, as limited by these covenants.   The Company also had outstanding letters of credit of $76.2 million as of June 30, 2011.

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Business Combination (Schedule Of Costs And Expenses Reflected In The Income Before Income Taxes) (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2011
Severance costs		$ 3,400	$ 13,498
Write off of acquired assets			7,316
Bridge financing fees	49,490		49,490
Total cost and expenses			121,659
ICG [Member]
Cost of affecting the acquisition	23,503		23,503
Parent/Issuer [Member]
Cost of affecting the acquisition	27,852		27,852
Bridge financing fees	$ 49,490		$ 49,490

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Investments (Tables)

6 Months Ended

Jun. 30, 2011

Investments

Schedule Of Equity Method Investments

	Knight Hawk			DKRW			DTA			Tenaska			Millennium			Total
	(In thousands)
Balance at December 31, 2010	$	131,250		$	21,961		$	14,472		$	9,768		$	—		$	177,451
Investments in affiliates	—			—			2,910			5,500			25,570			33,980
Advances to (distributions from) affiliates, net	(9,591		)	—			—			—			—			(9,591		)
Equity in comprehensive income (loss)	9,981			(1,079		)	(2,207		)	(2		)	(887		)	5,806
Balance at June 30, 2011	$	131,640		$	20,882		$	15,175		$	15,266		$	24,683		$	207,646
Notes receivable from investees:
Balance at December 31, 2010	$	1,700		$	18,100		$	—		$	4,100		$	—		$	23,900
Balance at June 30, 2011	—			24,700			—			4,600			—			29,300

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Segment Information (Reconciliation Statement Of Segment Income from Operations To Consolidated Income Before Income Taxes) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Segment Information
Income from operations	$ 102,817	$ 106,499	$ 205,055	$ 138,699
Interest expense	(42,249)	(35,125)	(76,829)	(70,208)
Interest income	755	623	1,501	961
Bridge financing costs related to ICG	(49,490)		(49,490)
Net loss resulting from early retirement of ICG debt	(250)		(250)
Income before income taxes	$ 11,583	$ 71,997	$ 79,987	$ 69,452

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Earnings Per Common Share (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Earnings Per Common Share
Basic weighted average shares outstanding	174,244,000	162,388,000	168,442,000	162,380,000
Effect of common stock equivalents under incentive plans	1,028,000	742,000	1,112,000	725,000
Diluted weighted average shares outstanding	175,272,000	163,130,000	169,554,000	163,105,000
Effect of options to purchase common stock	2,300,000	2,400,000	1,700,000	2,400,000

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Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2011

Employee Benefit Plans

Pension Benefit Costs

	Three Months Ended June 30						Six Months Ended June 30
	2011			2010			2011			2010
	(In thousands)						(In thousands)
Service cost	$	3,926		$	4,062		$	8,245		$	7,935
Interest cost	3,996			3,790			8,127			7,911
Expected return on plan assets	(5,438		)	(5,530		)	(10,906		)	(9,696		)
Amortization of prior service cost	(142		)	43			(95		)	86
Amortization of other actuarial losses	2,235			1,161			4,374			3,566
Net benefit cost	$	4,577		$	3,526		$	9,745		$	9,802

Other Postretirement Benefit Costs

	Three Months Ended June 30						Six Months Ended June 30
	2011			2010			2011			2010
	(In thousands)						(In thousands)
Service cost	$	518		$	308		$	923		$	754
Interest cost	529			394			1,027			1,042
Amortization of prior service credits	(546		)	(679		)	(1,137		)	(1,182		)
Amortization of other actuarial gains	(952		)	(989		)	(1,550		)	(1,459		)
Net benefit credit	$	(451	)	$	(966	)	$	(737	)	$	(845	)

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Business Combination (Summary Of Unaudited Pro Forma) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Business Combination
Total revenues as reported	$ 985,087,000	$ 764,295,000	$ 1,858,025,000	$ 1,476,169,000
Total revenues pro forma	1,233,900,000	1,044,000,000	2,397,700,000	2,035,800,000
Income before income taxes as reported	11,583,000	71,997,000	79,987,000	69,452,000
Income (loss) before income taxes pro forma	$ 62,000,000	$ (67,800,000)	$ 74,900,000	$ (86,200,000)

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Inventories (Tables)

6 Months Ended

Jun. 30, 2011

Inventories

Inventories

	June 30, 2011		December 31, 2010
	(In thousands)
Coal	$	189,989	$	115,647
Repair parts and supplies, net of allowance	160,212		119,969
	$	350,201	$	235,616

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Employee Benefit Plans

6 Months Ended

Jun. 30, 2011

Employee Benefit Plans

Employee Benefit Plans

13. Employee Benefit Plans

The following table details the components of pension benefit costs:

	Three Months Ended June 30						Six Months Ended June 30
	2011			2010			2011			2010
	(In thousands)						(In thousands)
Service cost	$	3,926		$	4,062		$	8,245		$	7,935
Interest cost	3,996			3,790			8,127			7,911
Expected return on plan assets	(5,438		)	(5,530		)	(10,906		)	(9,696		)
Amortization of prior service cost	(142		)	43			(95		)	86
Amortization of other actuarial losses	2,235			1,161			4,374			3,566
Net benefit cost	$	4,577		$	3,526		$	9,745		$	9,802

The following table details the components of other postretirement benefit credits:

	Three Months Ended June 30						Six Months Ended June 30
	2011			2010			2011			2010
	(In thousands)						(In thousands)
Service cost	$	518		$	308		$	923		$	754
Interest cost	529			394			1,027			1,042
Amortization of prior service credits	(546		)	(679		)	(1,137		)	(1,182		)
Amortization of other actuarial gains	(952		)	(989		)	(1,550		)	(1,459		)
Net benefit credit	$	(451	)	$	(966	)	$	(737	)	$	(845	)

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Fair Value Measurements (Summary Of Financial Assets And Liabilities Accounted For At Fair Value) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Assets:
Investments in equity securities	$ 6,335
Derivatives	30,881	28,666
Total assets	37,216
Liabilities:
Derivatives	5,791	4,947
Level 1 [Member]
Assets:
Investments in equity securities	6,319
Derivatives	6,233
Total assets	12,552
Liabilities:
Derivatives
Level 2 [Member]
Assets:
Investments in equity securities
Derivatives	10,054
Total assets	10,054
Liabilities:
Derivatives	1,655
Level 3 [Member]
Assets:
Investments in equity securities	16
Derivatives	14,594
Total assets	14,610
Liabilities:
Derivatives	$ 4,136

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Comprehensive Income (Components Of Comprehensive Income) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Comprehensive Income
Net income attributable to Arch Coal, Inc.	$ 11,079	$ 66,156	$ 66,680	$ 64,360
Pension, postretirement and other post-employment benefits, reclassifications into net income	293	(536)	866	56
Unrealized losses on available-for-sale securities	(1,434)	(925)	(687)	(916)
Unrealized gains (losses) on derivatives	(3,127)	(5,451)	6,374	(5,089)
Reclassifications of (gains) losses into net income	(4,360)	(506)	(6,484)	1,217
Total comprehensive income	$ 2,451	$ 58,738	$ 66,749	$ 59,628

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Acquired Sales Contracts

6 Months Ended

Jun. 30, 2011

Acquired Sales Contracts

Acquired Sales Contracts

6. Acquired Sales Contracts

Coal supply agreements (sales contracts) acquired in a business combination are capitalized at their fair value and amortized over the tons of coal shipped during the term of the contract. The fair value of a sales contract is determined by discounting the cash flows attributable to the difference between the contract price and the prevailing forward prices for the tons under contract at the date of acquisition. Below are the acquired sales contracts reflected in the condensed consolidated balance sheets:

	June 30, 2011			December 31, 2010
	(In thousands)
Location in Balance Sheet
Other current assets	$	35,496		$	25,063
Other assets	24,622			7,014
Total	60,118			32,077
Accrued expenses and other current liabilities	(80,411		)	(5,615		)
Other noncurrent liabilities	(58,787		)	(20,426		)
Total	(139,198		)	(26,041		)
Net total	$	(79,080	)	$	6,036

Above-market contracts with a preliminary fair value of $43.3 million and below-market contracts with a preliminary fair value of $121.0 million were acquired from ICG. Of these amounts, $22.7 million and $75.4 million were classified as current assets and current liabilities, respectively, at the acquisition date.

The Company anticipates amortization income of all acquired sales contracts, based upon the preliminary fair value assigned to acquired ICG sales contracts and expected shipments in the next five years, to be approximately $41 million for the remainder of 2011, $10 million in 2012, $6 million in 2013, $9 million in 2014 and $13 million in 2015.

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Guarantees

6 Months Ended

Jun. 30, 2011

Guarantees

Guarantees

16. Guarantees

The Company has agreed to continue to provide surety bonds and letters of credit for the reclamation and retiree healthcare obligations of Magnum Coal Company ("Magnum") related to the properties the Company sold to Magnum on December 31, 2005. Patriot Coal Corporation ("Patriot") acquired Magnum in July 2008. The purchase agreement requires Magnum to reimburse the Company for costs related to the surety bonds and letters of credit and to use commercially reasonable efforts to replace the obligations.

If the surety bonds and letters of credit related to the reclamation obligations are not replaced by Magnum within a specified period of time, Magnum must post a letter of credit in favor of the Company in the amounts of the reclamation obligations. As of June 30, 2011, Patriot has replaced $48.9 million of the surety bonds and has posted letters of credit of $32.7 million in the Company's favor.  At June 30, 2011, the Company had $38.5 million of surety bonds remaining related to properties sold to Magnum. The surety bonding amounts are mandated by the state and are not directly related to the estimated cost to reclaim the properties.

Magnum also acquired certain coal supply contracts with customers who have not consented to the contracts' assignment from the Company to Magnum. The Company has committed to purchase coal from Magnum to sell to those customers at the same price it is charging the customers for the sale. In addition, certain contracts were assigned to Magnum, but the Company has guaranteed Magnum's performance under the contracts. The longest of the coal supply contracts extends to the year 2017. If Magnum is unable to supply the coal for these coal sales contracts then the Company would be required to purchase coal on the open market or supply contracts from its existing operations. At market prices effective at June 30, 2011, the cost of purchasing 10.7 million tons of coal to supply the contracts that have not been assigned over their duration would exceed the sales price under the contracts by approximately $368.2 million, and the cost of purchasing 1.1 million tons of coal to supply the assigned and guaranteed contracts over their duration would exceed the sales price under the contracts by approximately $23.8 million. As the Company does not believe that it is probable that it would have to purchase replacement coal, no losses have been recorded in the consolidated financial statements as of June 30, 2011. However, if the Company would have to perform under these guarantees, it could potentially have a material adverse effect on the business, results of operations and financial condition of the Company.

In connection with the Company's acquisition of the coal operations of Atlantic Richfield Company (ARCO) and the simultaneous combination of the acquired ARCO operations and the Company's Wyoming operations into the Arch Western joint venture, the Company agreed to indemnify the other member of Arch Western against certain tax liabilities in the event that such liabilities arise prior to June 1, 2013 as a result of certain actions taken, including the sale or other disposition of certain properties of Arch Western, the repurchase of certain equity interests in Arch Western by Arch Western or the reduction under certain circumstances of indebtedness incurred by Arch Western in connection with the acquisition. If the Company were to become liable, the maximum amount of potential future tax payments is $25.3 million at June 30, 2011, which is not recorded as a liability in the Company's condensed consolidated financial statements. Since the indemnification is dependent upon the initiation of activities within the Company's control and the Company does not intend to initiate such activities, it is remote that the Company will become liable for any obligation related to this indemnification. However, if such indemnification obligation were to arise, it could potentially have a material adverse effect on the business, results of operations and financial condition of the Company.

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Segment Information (Schedule Of Operating Segment Results) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Coal sales	$ 985,087	$ 764,295	$ 1,858,025	$ 1,476,169
Income from operations	102,817	106,499	205,055	138,699
Total assets	10,151,445	4,890,540	10,151,445	4,890,540	4,880,769
Depreciation, depletion and amortization	95,183	87,759	178,720	176,278
Amortization of acquired sales contacts, net	1,489	5,214	7,433	15,967
Capital expenditures	69,014	139,983	107,725	171,958
Number of reportable business segments			three
PRB [Member]
Coal sales	391,413	370,499	784,526	729,914
Income from operations	35,615	33,177	82,489	49,738
Total assets	2,212,818	2,331,449	2,212,818	2,331,449
Depreciation, depletion and amortization	41,165	44,433	82,856	89,054
Amortization of acquired sales contacts, net	5,603	5,214	11,547	15,967
Capital expenditures	15,647	3,725	18,485	4,450
WBIT [Member]
Coal sales	189,154	132,150	344,593	264,863
Income from operations	43,672	13,876	70,564	26,306
Total assets	679,231	682,565	679,231	682,565
Depreciation, depletion and amortization	22,099	18,390	42,628	38,760
Capital expenditures	10,115	20,703	21,892	33,804
APP [Member]
Coal sales	400,792	261,646	725,178	481,392
Income from operations	97,876	54,079	152,270	91,672
Total assets	5,208,551	725,588	5,208,551	725,588
Depreciation, depletion and amortization	31,025	24,581	52,041	47,755
Amortization of acquired sales contacts, net	(4,123)		(4,123)
Capital expenditures	29,288	12,972	46,590	24,609
Other [Member]
Coal sales	3,728		3,728
Income from operations	317		317
Total assets	217,765		217,765
Depreciation, depletion and amortization	605		605
Amortization of acquired sales contacts, net	9		9
Capital expenditures	4,328		4,373
Corporate, Other and Eliminations [Member]
Income from operations	(74,663)	5,367	(100,585)	(29,017)
Total assets	1,833,080	1,150,938	1,833,080	1,150,938
Depreciation, depletion and amortization	289	355	590	709
Capital expenditures	$ 9,636	$ 102,583	$ 16,385	$ 109,095

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Guarantees (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2011
Bonding Requirements [Member] | Magnum [Member]
Surety bonds posted in the company's favor	$ 48.9
Letters of credit posted in the Company's favor	32.7
Guarantee obligations, maximum exposure, undiscounted	38.5
Indemnification Agreement [Member]
Guarantee obligations, maximum exposure, undiscounted	25.3
Performance Guarantee [Member] | Magnum [Member]
Volume of purchased coal in tons	1,100,000
Magnum [Member]
Guarantee obligations, maximum exposure, undiscounted	23.8
Excess of the current market cost of purchasing coal over the selling price	$ 368.2
Volume of purchased coal in tons	10,700,000

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Business Combination (Narrative) (Details) (USD $) Share data in Millions	0 Months Ended		6 Months Ended		0 Months Ended
	Jul. 08, 2011	Jun. 08, 2011	Dec. 31, 2011	Jun. 30, 2011	Jun. 15, 2011 Number Of Mining Complexes - Appalachia [Member]	Jun. 15, 2011 Number Of Mining Complexes - Illinois [Member]
Number of mining complexes operated					12	one
Purchase of common stock value				$ 3,100,000,000
Proceeds from the issuance of common stock, net		1,250,000		1,249,407,000
Number of shares sold	0.7	48.0		48.0
Proceeds from the issuance of $2.0 billion in aggregate principal amount of senior notes				2,000,000,000
Revenues related to the acquired operations included in the statement of income since acquisition				48,000,000
Income before income taxes related to the acquired operations included in the statement of income since acquisition				11,900,000
Severance costs			3,400,000	13,498,000
Restricted cash				$ 351,000,000

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Derivatives (Tables)

6 Months Ended

Jun. 30, 2011

Derivatives

Disclosure Of Fair Value Of Derivatives

Fair Value of Derivatives

(in thousands)

	June 30, 2011			December 31, 2010
	Asset Derivative	Liability Derivative		Asset Derivative	Liability Derivative
Derivatives Designated as Hedging Instruments
Heating oil	$    18,101	$            —		$    13,475	$            —
Coal	3,273	(1,924)		2,009	(2,350)
Total	21,374	(1,924)		15,484	(2,350)
Derivatives Not Designated as Hedging Instruments
Coal — held for trading purposes	18,780	(9,788)		34,445	(24,087)
Coal	1,352	(4,704)		1,139	(912)
Total	20,132	(14,492)		35,584	(24,999)
Total derivatives	41,506	(16,416)		51,068	(27,349)
Effect of counterparty netting	(10,625)	10,625		(22,402)	22,402
Net derivatives as classified in the balance sheets	$    30,881	$     (5,791)	$   25,090	$    28,666	$     (4,947)	$   23,719

Net derivatives as reflected on the balance sheets

		June 30,      2011	December 31,         2010
Heating oil	Other current assets	$   18,101	$   13,475
Coal	Coal derivative assets	12,780	15,191
	Coal derivative liabilities	(5,791)	(4,947)
		$   25,090	$   23,719

Effects Of Derivatives On Measures Of Financial Performance

Three Months Ended June 30

(in thousands)

Derivatives used inCash Flow Hedging	Gain (Loss) Recognized in OCI (Effective Portion)						Gains (Losses) Reclassified from OCI into Income (Effective Portion)						Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Relationships	2011			2010			2011			2010			2011		2010
Heating oil	$	(6,337	)	$	(8,572	)	$	6,654	(2)	$	1,925	(2)	$	—	$	—
Coal sales	1,344			(7,237		)	237		(1)	(1,201		)(1)	—		—
Coal purchases	97			7,167			—		(2)	—		(2)	—		—
Totals	$	(4,896	)	$	(8,642	)	$	6,891		$	724		$	—	$	—

Derivatives Not Designated as	Gain (Loss)
Hedging Instruments	2011			2010
Coal — unrealized	$	(374	)(3)	$	(3,466	)(3)
Coal — realized	$	147	(4)	$	1,252	(4)

Location in Statement of Income:

(1)Coal sales

(2)Cost of coal sales

(3)Change in fair value of coal derivatives and coal trading activities, net

(4)Other operating income, net

Six Months Ended June 30

(in thousands)

Derivatives used inCash Flow Hedging	Gain (Loss) Recognized in OCI (Effective Portion)						Gains (Losses) Reclassified from OCI into Income (Effective Portion)						Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Relationships	2011			2010			2011			2010			2011		2010
Heating oil	$	7,921		$	(8,560	)	$	9,824	(2)	$	(304	)(2)	$	—	$	—
Coal sales	2,750			(7,638		)	324		(1)	(1,330		)(1)	—		—
Coal purchases	(779		)	8,069			—		(2)	(336		)(2)	—		—
Totals	$	9,892		$	(8,129	)	$	10,148		$	(1,970	)	$	—	$	—

Derivatives Not Designated as	Gain (Loss)
Hedging Instruments	2011			2010
Coal — unrealized	$	(1,419	)(3)	$	(8,388	)(3)
Coal — realized	$	147	(4)	$	2,852	(4)

Location in Statement of Income:

(1)Coal sales

(2)Cost of coal sales

(3)Change in fair value of coal derivatives and coal trading activities, net

(4)Other operating income, net

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Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
OPERATING ACTIVITIES
Net income	$ 67,271	$ 64,504
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation, depletion and amortization	178,720	176,278
Amortization of acquired sales contracts, net	7,433	15,967
Bridge financing costs related to ICG	49,490
Net loss resulting from early retirement of ICG debt	250
Write down of assets acquired from ICG	7,316
Prepaid royalties expensed	19,491	16,048
Employee stock-based compensation expense	7,071	7,439
Amortization of debt financing costs	5,093	4,901
Gain on Knight Hawk transaction		(41,577)
Changes in:
Receivables	(25,329)	(44,057)
Inventories	(37,113)	2,458
Coal derivative assets and liabilities	4,902	11,631
Accounts payable, accrued expenses and other current liabilities	8,912	32,060
Income taxes, net	(15,186)	(309)
Deferred income taxes	20,873	(4,719)
Other	15,006	18,731
Cash provided by operating activities	314,200	259,355
INVESTING ACTIVITIES
Acquisition of ICG, net of cash acquired	(2,910,380)
Change in restricted cash	(74,814)
Capital expenditures	(107,725)	(171,958)
Proceeds from dispositions of property, plant and equipment	1,411	229
Purchases of investments and advances to affiliates	(38,059)	(14,249)
Additions to prepaid royalties	(25,212)	(23,466)
Cash used in investing activities	(3,154,779)	(209,444)
FINANCING ACTIVITIES
Proceeds from the issuance of senior notes	2,000,000
Proceeds from the issuance of common stock, net	1,249,407
Payments to retire ICG debt	(307,984)
Increase in restricted cash for retirement of ICG debt	(260,663)
Net increase (decrease) in borrowings under lines of credit and commercial paper program	303,096	(15,555)
Net payments on other debt	(8,845)	(8,249)
Debt financing costs	(112,334)	(437)
Dividends paid	(34,192)	(30,870)
Issuance of common stock under incentive plans	846	137
Contribution from noncontrolling interest		891
Cash provided by (used in) financing activities	2,829,331	(54,083)
Decrease in cash and cash equivalents	(11,248)	(4,172)
Cash and cash equivalents, beginning of period	93,593	61,138
Cash and cash equivalents, end of period	$ 82,345	$ 56,966

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Contingencies

6 Months Ended

Jun. 30, 2011

Contingencies

Contingencies

17. Contingencies

On June 15, 2011, we acquired ICG and its subsidiaries.  The following matters related to certain claims and legal actions involving ICG and/or its subsidiaries.

Allegheny Energy Supply ("Allegheny"), the sole customer of coal produced at the Company's subsidiary Wolf Run Mining Company's ("Wolf Run") Sycamore No. 2 mine, filed a lawsuit against Wolf Run, Hunter Ridge Holdings, Inc. ("Hunter Ridge"), and ICG in state court in Allegheny County, Pennsylvania on December 28, 2006, and amended its complaint on April 23, 2007. Allegheny claimed that Wolf Run breached a coal supply contract when it declared force majeure under the contract upon idling the Sycamore No. 2 mine in the third quarter of 2006, and that Wolf Run continued to breach the contract by failing to ship in volumes referenced in the contract. The Sycamore No. 2 mine was idled after encountering adverse geologic conditions and abandoned gas wells that were previously unidentified and unmapped. After extensive searching for gas wells and rehabilitation of the mine, it was re-opened in 2007, but with notice to Allegheny that it would necessarily operate at reduced volumes in order to safely and effectively avoid the many gas wells within the reserve. The amended complaint also alleged that the production stoppages constitute a breach of the guarantee agreement by Hunter Ridge and breach of certain representations made upon entering into the contract in early 2005. Allegheny voluntarily dropped the breach of representation claims later. Allegheny claimed that it would incur costs in excess of $100 million to purchase replacement coal over the life of the contract. ICG, Wolf Run and Hunter Ridge answered the amended complaint on August 13, 2007, disputing all of the remaining claims.

On November 3, 2008, ICG, Wolf Run and Hunter Ridge filed an amended answer and counterclaim against the plaintiffs seeking to void the coal supply agreement due to, among other things, fraudulent inducement and conspiracy. On September 23, 2009, Allegheny filed a second amended complaint alleging several alternative theories of liability in its effort to extend contractual liability to ICG, which was not a party to the original contract and did not exist at the time Wolf Run and Allegheny entered into the contract.  No new substantive claims were asserted.  ICG answered the second amended complaint on October 13, 2009, denying all of the new claims. The Company's counterclaim was dismissed on motion for summary judgment entered on May 11, 2010.  Allegheny's claims against ICG were also dismissed by summary judgment, but the claims against Wolf Run and Hunter Ridge were not. The court conducted a non-jury trial of this matter beginning on January 10, 2011 and concluding on February 1, 2011. At the trial, Allegheny presented its evidence for breach of contract and claimed that it is entitled to past and future damages in the aggregate of between $228.0 million and $377.0 million. Wolf Run and Hunter Ridge presented their defense of the claims, including evidence with respect to the existence of force majeure conditions and excuse under the contract and applicable law. Wolf Run and Hunter Ridge presented evidence that Allegheny's damages calculations were significantly inflated because it did not seek to determine damages as of the time of the breach and in some instances artificially assumed future non-delivery or did not take into account the apparent requirement to supply coal in the future. On May 2, 2011, the trial court entered a Memorandum and Verdict determining that Wolf Run had breached the coal supply contract and that the performance shortfall was not excused by force majeure. The trial court awarded total damages and interest in the amount of $104.1 million. ICG and Allegheny have filed post-verdict motions in the trial court.  The court's judgment on those motions is expected to be issued soon, after which the Company expects to appeal to the Pennsylvania appellate court, if necessary. No appeal bond is necessary while post-verdict motions are pending with the trial court, but an appeal bond equal to the damages assessed may have to be posted in the future.

As of June 30, 2011, the Company has accrued $104.1 million for this lawsuit, representing the fair value of the judgment at the acquisition date.  The ultimate resolution of this matter could result in an outcome which may be materially different than what the Company has accrued.

In addition, the Company is a party to numerous claims and lawsuits with respect to various matters. The Company provides for costs related to contingencies when a loss is probable and the amount is reasonably determinable. After conferring with counsel, it is the opinion of management that the ultimate resolution of pending claims, other than as noted above, will not have a material adverse effect on the consolidated financial condition, results of operations or liquidity of the Company.

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Debt (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended	6 Months Ended				0 Months Ended	6 Months Ended							3 Months Ended		6 Months Ended		0 Months Ended		6 Months Ended			6 Months Ended
	Jun. 14, 2011	Jun. 30, 2011	Dec. 31, 2019	Jun. 30, 2011	Jul. 31, 2011	Dec. 31, 2010	Jul. 14, 2011 Repayment of Debt [Member] 9.125% Senior Notes Due April 1, 2018 [Member]	Jun. 30, 2011 June 15, 2015 through June 14, 2016 [Member] 7.00% Senior Notes Due June 15, 2019 [Member]	Jun. 30, 2011 June 15, 2016 through June 14, 2017 [Member] 7.00% Senior Notes Due June 15, 2019 [Member]	Jun. 30, 2011 June 15, 2016 through June 14, 2017 [Member] 7.25% Senior Notes Due 2021 [Member]	Jun. 30, 2011 June 15, 2017 and beyond [Member] 7.00% Senior Notes Due June 15, 2019 [Member]	Jun. 30, 2011 June 15, 2017 and beyond [Member] 7.25% Senior Notes Due 2021 [Member]	Jun. 30, 2011 June 15, 2017 through June 14, 2018 [Member] 7.25% Senior Notes Due 2021 [Member]	Jun. 30, 2011 June 15, 2018 through June 14, 2019 [Member] 7.25% Senior Notes Due 2021 [Member]	Jun. 30, 2011 7.00% Senior Notes Due June 15, 2019 [Member]	Jun. 30, 2011 7.25% Senior Notes Due 2021 [Member]	Jun. 30, 2011 Prior To June 15, 2014 [Member]	Jun. 30, 2011 Revolving Credit Facility [Member]	Jul. 14, 2011 9.125% Senior Notes Due April 1, 2018 [Member]	Jun. 30, 2011 9.125% Senior Notes Due April 1, 2018 [Member]	Jun. 30, 2011 4.00% Convertible Senior Notes Due April 1, 2017 [Member]	Jun. 30, 2011 9.00% Convertible Senior Notes Due August 1, 2012 [Member]	Jun. 30, 2011 Senior Notes [Member]	Jun. 30, 2011 ICG Debt [Member]
Percentage of maximum redemption aggregate principal amount from equity proceeds																	35.00%
Call premium								103.50%	101.75%	103.625%	100.00%	100.00%	102.417%	101.208%
Tender offer price upon change in control			101.00%
Incurred financing fees																		$ 20,700,000					$ 44,200,000
Calculated conversion rate																					2,614.6848	2,392.73414
Principal amount increment for conversion																					1,000	1,000
Registration statement effective date deadline															June 13, 2012	June, 13 2012
Registration Rights agreement violation per annum penalty in first 90 days															0.25%	0.25%
Registration rights agreement violation additional per annum penalty															0.25%	0.25%
Registration Rights agreement violation maximum per annum penalty															1.00%	1.00%
Restricted cash		350,966,000		350,966,000																260,700,000
Subsequent event, senior notes redeemed							251,400,000
Accrued interest																			5,200,000
Debt conversion converted instrument amount					4,500,000
Debt assumed in acquisition		604,800,000		604,800,000																	298,500,000	1,700,000		54,000,000
Remaining balance of other ICG debt		10,264,000		10,264,000		14,093,000																		5,200,000
Net loss resulting from early retirement of ICG debt		(250,000)		(250,000)																				300,000
Revolving credit facility borrowings outstanding		360,000,000		360,000,000
Line of credit facility maturity term	5
Line of credit facility, expiration date	June 14, 2016
Line of credit facility, unused capacity, commitment fee percentage				0.50%
Secured revolving credit facility maximum borrowing amount	2,000,000,000
Line of credit facility, remaining borrowing capacity		1,100,000,000		1,100,000,000
Letters of credit outstanding, amount		$ 76,200,000		$ 76,200,000

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Supplemental Condensed Consolidating Financial Information

6 Months Ended

Jun. 30, 2011

Supplemental Condensed Consolidating Financial Information

Supplemental Condensed Consolidating Financial Information

19. Supplemental Condensed Consolidating Financial Information

Pursuant to the indenture governing the Arch Coal, Inc. senior notes, certain wholly-owned subsidiaries of the Company have fully and unconditionally guaranteed the senior notes on a joint and several basis. The following tables present unaudited condensed consolidating financial information for (i) the Company, (ii) the issuer of the senior notes, (iii) the guarantors under the Notes, and (iv) the entities which are not guarantors under the Notes (Arch Western Resources, LLC and Arch Receivable Company, LLC):

Condensed Consolidating Statements of Income

Three Months Ended June 30, 2011

(unaudited)

	Parent/Issuer			Guarantor Subsidiaries			Non-GuarantorSubsidiaries			Eliminations			Consolidated
	(In thousands)
Revenue
Coal sales	$	—		$	419,454		$	565,633		$	—		$	985,087
Costs, expenses and other
Cost of coal sales	4,940			282,535			447,707			(25,229		)	709,953
Depreciation, depletion and amortization	659			54,008			40,516			—			95,183
Amortization of acquired sales contracts, net	—			(4,113		)	5,602			—			1,489
Selling, general and administrative expenses	18,600			3,170			9,104			(1,835		)	29,039
Change in fair value of coal derivatives and coal trading activities, net	—			2,672			—			—			2,672
Acquisition and transition costs related to ICG	48,666			—			—			—			48,666
Other operating (income) expense, net	(4,831		)	(29,687		)	2,722			27,064			(4,732		)
	68,034			308,585			505,651			—			882,270
Income from investment in subsidiaries	172,831			—			—			(172,831		)	—
Income from operations	104,797			110,869			59,982			(172,831		)	102,817
Interest income (expense), net:
Interest expense	(47,824		)	(1,924		)	(10,962		)	18,461			(42,249		)
Interest income	4,100			135			14,981			(18,461		)	755
	(43,724		)	(1,789		)	4,019			—			(41,494		)
Other non-operating expense:
Bridge financing costs related to ICG	(49,490		)	—			—			—			(49,490		)
Net loss resulting from early retirement of ICG debt	—			(250		)	—			—			(250		)
	(49,490		)	(250		)	—			—			(49,740		)
Income before income taxes	11,583			108,830			64,001			(172,831		)	11,583
Provision for income taxes	186			—			—			—			186
Net income	11,397			108,830			64,001			(172,831		)	11,397
Less: Net income attributable to noncontrolling interest	(318		)	—			—			—			(318		)
Net income attributable to Arch Coal	$	11,079		$	108,830		$	64,001		$	(172,831	)	$	11,079

Condensed Consolidating Statements of Income

Three Months Ended June 30, 2010

(unaudited)

	Parent/Issuer			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	(In thousands)
Revenue
Coal sales	$	—		$	282,817		$	481,478		$	—		$	764,295
Costs, expenses and other
Cost of coal sales	2,148			193,243			396,568			(21,098		)	570,861
Depreciation, depletion and amortization	725			46,941			40,093			—			87,759
Amortization of acquired sales contracts, net	—			—			5,214			—			5,214
Selling, general and administrative expenses	23,251			1,836			12,006			(1,749		)	35,344
Change in fair value of coal derivatives and coal trading activities, net	—			4,587			—			—			4,587
Gain on Knight Hawk transaction	—			(41,577		)	—			—			(41,577		)
Other operating (income) expense, net	(2,818		)	(26,202		)	1,781			22,847			(4,392		)
	23,306			178,828			455,662			—			657,796
Income from investment in subsidiaries	126,555			—			—			(126,555		)	—
Income from operations	103,249			103,989			25,816			(126,555		)	106,499
Interest expense, net:
Interest expense	(33,524		)	(780		)	(18,387		)	17,566			(35,125		)
Interest income	2,272			75			15,842			(17,566		)	623
	(31,252		)	(705		)	(2,545		)	—			(34,502		)
Income before income taxes	71,997			103,284			23,271			(126,555		)	71,997
Provision for income taxes	5,723			—			—			—			5,723
Net income	66,274			103,284			23,271			(126,555		)	66,274
Less: Net income attributable to noncontrolling interest	(118		)	—			—			—			(118		)
Net income attributable to Arch Coal	$	66,156		$	103,284		$	23,271		$	(126,555	)	$	66,156

Condensed Consolidating Statements of Income

Six Months Ended June 30, 2011

(unaudited)

	Parent/Issuer			GuarantorSubsidiaries			Non-GuarantorSubsidiaries			Eliminations			Consolidated
	(In thousands)
Revenue
Coal sales	$	—		$	757,988		$	1,100,037		$	—		$	1,858,025
Costs, expenses and other
Cost of coal sales	8,219			534,420			871,030			(50,032		)	1,363,637
Depreciation, depletion and amortization	1,331			97,288			80,101			—			178,720
Amortization of acquired sales contracts, net	—			(4,113		)	11,546			—			7,433
Selling, general and administrative expenses	38,936			5,053			19,017			(3,532		)	59,474
Change in fair value of coal derivatives and coal trading activities, net	—			888			—			—			888
Acquisition and transition costs related to ICG	48,666			—			—			—			48,666
Other operating (income) expense, net	(9,398		)	(57,143		)	7,129			53,564			(5,848		)
	87,754			576,393			988,823			—			1,652,970
Income from investment in subsidiaries	297,834			—			—			(297,834		)	—
Income from operations	210,080			181,595			111,214			(297,834		)	205,055
Interest income (expense), net:
Interest expense	(88,445		)	(2,638		)	(21,944		)	36,198			(76,829		)
Interest income	7,842			432			29,425			(36,198		)	1,501
	(80,603		)	(2,206		)	7,481			—			(75,328		)
Other non-operating expense:
Bridge financing costs related to ICG	(49,490		)	—			—			—			(49,490		)
Net loss resulting from early retirement of ICG debt	—			(250		)	—			—			(250		)
	(49,490		)	(250		)	—			—			(49,740		)
Income before income taxes	79,987			179,139			118,695			(297,834		)	79,987
Provision for income taxes	12,716			—			—			—			12,716
Net income	67,271			179,139			118,695			(297,834		)	67,271
Less: Net income attributable to noncontrolling interest	(591		)	—			—			—			(591		)
Net income attributable to Arch Coal	$	66,680		$	179,139		$	118,695		$	(297,834	)	$	66,680

Condensed Consolidating Statements of Income

Six Months Ended June 30, 2010

(unaudited)

	Parent/Issuer			GuarantorSubsidiaries			Non-GuarantorSubsidiaries			Eliminations			Consolidated
	(In thousands)
Revenue
Coal sales	$	—		$	521,845		$	954,324		$	—		$	1,476,169
Costs, expenses and other
Cost of coal sales	4,976			361,961			794,079			(39,405		)	1,121,611
Depreciation, depletion and amortization	1,476			90,659			84,143			—			176,278
Amortization of acquired sales contracts, net	—			—			15,967			—			15,967
Selling, general and administrative expenses	41,894			3,642			20,409			(3,435		)	62,510
Change in fair value of coal derivatives and coal trading activities, net	—			10,464			—			—			10,464
Gain on Knight Hawk transaction	—			(41,577		)	—			—			(41,577		)
Other operating (income) expense, net	(4,778		)	(48,924		)	3,079			42,840			(7,783		)
	43,568			376,225			917,677			—			1,337,470
Income from investment in subsidiaries	173,820			—			—			(173,820		)	—
Income from operations	130,252			145,620			36,647			(173,820		)	138,699
Interest expense, net:
Interest expense	(64,955		)	(1,359		)	(36,503		)	32,609			(70,208		)
Interest income	4,155			164			29,251			(32,609		)	961
	(60,800		)	(1,195		)	(7,252		)	—			(69,247		)
Income before income taxes	69,452			144,425			29,395			(173,820		)	69,452
Provision for income taxes	4,948			—			—			—			4,948
Net income	64,504			144,425			29,395			(173,820		)	64,504
Less: Net income attributable to noncontrolling interest	(144		)	—			—			—			(144		)
Net income attributable to Arch Coal	$	64,360		$	144,425		$	29,395		$	(173,820	)	$	64,360

Condensed Consolidating Balance Sheets

June 30, 2011

(unaudited)

				Guarantor		Non-Guarantor
	Parent/Issuer			Subsidiaries		Subsidiaries		Eliminations			Consolidated
	(In thousands)
Assets
Cash and cash equivalents	$	9,350		$	2,134	$	70,861	$	—		$	82,345
Restricted cash	74,814			276,152		—		—			350,966
Receivables	51,241			134,803		241,653		(1,581		)	426,116
Inventories	—			177,614		172,587		—			350,201
Other	29,418			133,887		15,732		—			179,037
Total current assets	164,823			724,590		500,833		(1,581		)	1,388,665
Property, plant and equipment, net	11,268			6,257,368		1,457,820		—			7,726,456
Investment in subsidiaries	8,492,557			—		—		(8,492,557		)	—
Intercompany receivables	(2,160,682		)	818,816		1,341,866		—			—
Note receivable from Arch Western	225,000			—		—		(225,000		)	—
Other	445,302			577,022		14,000		—			1,036,324
Total other assets	7,002,177			1,395,838		1,355,866		(8,717,557		)	1,036,324
Total assets	$	7,178,268		$	8,377,796	$	3,314,519	$	(8,719,138	)	$	10,151,445
Liabilities and Stockholders' Equity
Accounts payable	$	26,716		$	164,243	$	95,478	$	—		$	286,437
Accrued expenses and other current liabilities	86,198			164,682		151,512		(1,581		)	400,811
Current maturities of debt and short-term borrowings	131,750			296,860		—		—			428,610
Total current liabilities	244,664			625,785		246,990		(1,581		)	1,115,858
Long-term debt	3,321,528			1,101		451,294		—			3,773,923
Note payable to Arch Coal	—			—		225,000		(225,000		)	—
Asset retirement obligations	622			105,428		306,274		—			412,324
Accrued pension benefits	13,087			4,333		18,627		—			36,047
Accrued postretirement benefits other than pension	14,888			49,734		23,004		—			87,626
Accrued workers' compensation	15,042			43,140		6,845		—			65,027
Deferred income taxes	(20,679		)	884,649		—		—			863,970
Other noncurrent liabilities	50,707			171,002		36,552		—			258,261
Total liabilities	3,639,859			1,885,172		1,314,586		(226,581		)	6,613,036
Redeemable noncontrolling interest	11,032			—		—		—			11,032
Stockholders' equity	3,527,377			6,492,624		1,999,933		(8,492,557		)	3,527,377
Total liabilities and stockholders' equity	$	7,178,268		$	8,377,796	$	3,314,519	$	(8,719,138	)	$	10,151,445

Condensed Consolidating Balance Sheets

December 31, 2010

(unaudited)

	Parent/Issuer			GuarantorSubsidiaries		Non-GuarantorSubsidiaries		Eliminations			Consolidated
	(In thousands)
Assets
Cash and cash equivalents	$	13,713		$	64	$	79,816	$	—		$	93,593
Receivables	31,458			12,740		210,075		(1,953		)	252,320
Inventories	—			85,196		150,420		—			235,616
Other	29,575			102,375		21,435		—			153,385
Total current assets	74,746			200,375		461,746		(1,953		)	734,914
Property, plant and equipment, net	9,817			1,800,578		1,498,497		—			3,308,892
Investment in subsidiaries	4,555,233			—		—		(4,555,233		)	—
Intercompany receivables	(1,807,902		)	508,624		1,299,278		—			—
Note receivable from Arch Western	225,000			—		—		(225,000		)	—
Other	481,345			344,698		10,920		—			836,963
Total other assets	3,453,676			853,322		1,310,198		(4,780,233		)	836,963
Total assets	$	3,538,239		$	2,854,275	$	3,270,441	$	(4,782,186	)	$	4,880,769
Liabilities and Stockholders' Equity
Accounts payable	$	10,753		$	65,793	$	121,670	$	—		$	198,216
Accrued expenses and other current liabilities	75,746			31,123		153,217		(1,953		)	258,133
Current maturities of debt and short-term borrowings	14,093			—		56,904		—			70,997
Total current liabilities	100,592			96,916		331,791		(1,953		)	527,346
Long-term debt	1,087,126			—		451,618		—			1,538,744
Note payable to Arch Coal	—			—		225,000		(225,000		)	—
Asset retirement obligations	873			32,029		301,355		—			334,257
Accrued pension benefits	20,843			4,407		23,904		—			49,154
Accrued postretirement benefits other than pension	14,284			—		23,509		—			37,793
Accrued workers' compensation	15,383			13,805		6,102		—			35,290
Other noncurrent liabilities	51,187			22,135		36,912		—			110,234
Total liabilities	1,290,288			169,292		1,400,191		(226,953		)	2,632,818
Redeemable noncontrolling interest	10,444			—		—		—			10,444
Stockholders' equity	2,237,507			2,684,983		1,870,250		(4,555,233		)	2,237,507
Total liabilities and stockholders' equity	$	3,538,239		$	2,854,275	$	3,270,441	$	(4,782,186	)	$	4,880,769

Condensed Consolidating Statements of Cash Flows

Six Months Ended June 30, 2011

(unaudited)

				Guarantor			Non-Guarantor
	Parent/Issuer			Subsidiaries			Subsidiaries			Eliminations			Consolidated
	(In thousands)
Cash provided by (used in) operating activities	$	(109,358	)	$	278,596		$	144,962		$	—		$	314,200
Investing Activities
Acquisition of ICG, net of cash acquired	(2,910,380		)	—			—			—			(2,910,380		)
Change in restricted cash	(74,814		)	—			—			—			(74,814		)
Capital expenditures	(2,459		)	(65,927		)	(39,339		)	—			(107,725		)
Proceeds from dispositions of property, plant and equipment	—			1,315			96			—			1,411
Purchases of investments and advances to affiliates	(725,938		)	(27,058		)	—			714,937			(38,059		)
Additions to prepaid royalties	—			(21,440		)	(3,772		)	—			(25,212		)
Cash used in investing activities	(3,713,591		)	(113,110		)	(43,015		)	714,937			(3,154,779		)
Financing Activities
Proceeds from the issuance of senior notes	2,000,000			—			—			—			2,000,000
Proceeds from the issuance of common stock, net	1,249,407			—			—			—			1,249,407
Contributions from parent	—			714,937						(714,937		)	—
Payments to retire ICG debt	—			(307,984		)	—			—			(307,984		)
Increase in restricted cash for retirement of ICG debt	—			(260,663		)	—			—			(260,663		)
Net increase (decrease) in borrowings under lines of credit and commercial paper program	360,000			—			(56,904		)	—			303,096
Net payments on other debt	(8,845		)	—			—			—			(8,845		)
Debt financing costs	(112,326		)	—			(8		)	—			(112,334		)
Dividends paid	(34,192		)	—			—			—			(34,192		)
Issuance of common stock under incentive plans	846			—			—			—			846
Transactions with affiliates, net	363,696			(309,706		)	(53,990		)	—			—
Cash provided by (used in) financing activities	3,818,586			(163,416		)	(110,902		)	(714,937		)	2,829,331
Increase (decrease) in cash and cash equivalents	(4,363		)	2,070			(8,955		)	—			(11,248		)
Cash and cash equivalents, beginning of period	13,713			64			79,816			—			93,593
Cash and cash equivalents, end of period	$	9,350		$	2,134		$	70,861		$	—		$	82,345

Condensed Consolidating Statements of Cash Flows

Six Months Ended June 30, 2010

(unaudited)

	Parent/Issuer			GuarantorSubsidiaries			Non-GuarantorSubsidiaries			Consolidated
	(in thousands)
Cash provided by (used in) operating activities	$	(134,960	)	$	240,408		$	153,907		$	259,355
Investing Activities
Capital expenditures	(1,006		)	(123,761		)	(47,191		)	(171,958		)
Proceeds from dispositions of property, plant and equipment	—			155			74			229
Purchases of investments and advances to affiliates	(11,303		)	(2,946		)	—			(14,249		)
Additions to prepaid royalties	—			(20,831		)	(2,635		)	(23,466		)
Cash used in investing activities	(12,309		)	(147,383		)	(49,752		)	(209,444		)
Financing Activities
Net increase (decrease) in borrowings under lines of credit and commercial paper program	(55,000		)	—			39,445			(15,555		)
Net payments on other debt	(8,249		)	—			—			(8,249		)
Debt financing costs	(32		)	—			(405		)	(437		)
Dividends paid	(30,870		)	—			—			(30,870		)
Issuance of common stock under incentive plans	137			—			—			137
Contribution from noncontrolling interest	—			—			891			891
Transactions with affiliates, net	211,424			(93,025		)	(118,399		)	—
Cash provided by (used in) financing activities	117,410			(93,025		)	(78,468		)	(54,083		)
Increase (decrease) in cash and cash equivalents	(29,859		)	—			25,687			(4,172		)
Cash and cash equivalents, beginning of period	54,255			64			6,819			61,138
Cash and cash equivalents, end of period	$	24,396		$	64		$	32,506		$	56,966

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Supplemental Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Balance Sheets) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2009
Assets
Cash and cash equivalents	$ 82,345	$ 93,593	$ 56,966	$ 61,138
Restricted cash	350,966
Receivables	426,116	252,320
Inventories	350,201	235,616
Other	179,037	153,385
Total current assets	1,388,665	734,914
Property, plant and equipment, net	7,726,456	3,308,892
Other	1,036,324	836,963
Total other assets	1,036,324	836,963
Total assets	10,151,445	4,880,769	4,890,540
Liabilities and Stockholders' Equity
Accounts payable	286,437	198,216
Accrued expenses and other current liabilities	400,811	258,133
Current maturities of debt and short-term borrowings	428,610	70,997
Total current liabilities	1,115,858	527,346
Long-term debt	3,773,923	1,538,744
Asset retirement obligations	412,324	334,257
Accrued pension benefits	36,047	49,154
Accrued postretirement benefits other than pension	87,626	37,793
Accrued workers' compensation	65,027	35,290
Deferred income taxes	863,970
Other noncurrent liabilities	258,261	110,234
Total liabilities	6,613,036	2,632,818
Redeemable noncontrolling interest	11,032	10,444
Stockholders' equity	3,527,377	2,237,507
Total liabilities and stockholders' equity	10,151,445	4,880,769
Parent/Issuer [Member]
Assets
Cash and cash equivalents	9,350	13,713	24,396	54,255
Restricted cash	74,814
Receivables	51,241	31,458
Other	29,418	29,575
Total current assets	164,823	74,746
Property, plant and equipment, net	11,268	9,817
Investment in subsidiaries	8,492,557	4,555,233
Intercompany receivables	(2,160,682)	(1,807,902)
Note receivable from Arch Western	225,000	225,000
Other	445,302	481,345
Total other assets	7,002,177	3,453,676
Total assets	7,178,268	3,538,239
Liabilities and Stockholders' Equity
Accounts payable	26,716	10,753
Accrued expenses and other current liabilities	86,198	75,746
Current maturities of debt and short-term borrowings	131,750	14,093
Total current liabilities	244,664	100,592
Long-term debt	3,321,528	1,087,126
Asset retirement obligations	622	873
Accrued pension benefits	13,087	20,843
Accrued postretirement benefits other than pension	14,888	14,284
Accrued workers' compensation	15,042	15,383
Deferred income taxes	(20,679)
Other noncurrent liabilities	50,707	51,187
Total liabilities	3,639,859	1,290,288
Redeemable noncontrolling interest	11,032	10,444
Stockholders' equity	3,527,377	2,237,507
Total liabilities and stockholders' equity	7,178,268	3,538,239
Guarantor Subsidiaries [Member]
Assets
Cash and cash equivalents	2,134	64	64	64
Restricted cash	276,152
Receivables	134,803	12,740
Inventories	177,614	85,196
Other	133,887	102,375
Total current assets	724,590	200,375
Property, plant and equipment, net	6,257,368	1,800,578
Intercompany receivables	818,816	508,624
Other	577,022	344,698
Total other assets	1,395,838	853,322
Total assets	8,377,796	2,854,275
Liabilities and Stockholders' Equity
Accounts payable	164,243	65,793
Accrued expenses and other current liabilities	164,682	31,123
Current maturities of debt and short-term borrowings	296,860
Total current liabilities	625,785	96,916
Long-term debt	1,101
Asset retirement obligations	105,428	32,029
Accrued pension benefits	4,333	4,407
Accrued postretirement benefits other than pension	49,734
Accrued workers' compensation	43,140	13,805
Deferred income taxes	884,649
Other noncurrent liabilities	171,002	22,135
Total liabilities	1,885,172	169,292
Stockholders' equity	6,492,624	2,684,983
Total liabilities and stockholders' equity	8,377,796	2,854,275
Non-Guarantor Subsidiaries [Member]
Assets
Cash and cash equivalents	70,861	79,816	32,506	6,819
Receivables	241,653	210,075
Inventories	172,587	150,420
Other	15,732	21,435
Total current assets	500,833	461,746
Property, plant and equipment, net	1,457,820	1,498,497
Intercompany receivables	1,341,866	1,299,278
Other	14,000	10,920
Total other assets	1,355,866	1,310,198
Total assets	3,314,519	3,270,441
Liabilities and Stockholders' Equity
Accounts payable	95,478	121,670
Accrued expenses and other current liabilities	151,512	153,217
Current maturities of debt and short-term borrowings		56,904
Total current liabilities	246,990	331,791
Long-term debt	451,294	451,618
Note payable to Arch Coal	225,000	225,000
Asset retirement obligations	306,274	301,355
Accrued pension benefits	18,627	23,904
Accrued postretirement benefits other than pension	23,004	23,509
Accrued workers' compensation	6,845	6,102
Other noncurrent liabilities	36,552	36,912
Total liabilities	1,314,586	1,400,191
Stockholders' equity	1,999,933	1,870,250
Total liabilities and stockholders' equity	3,314,519	3,270,441
Eliminations [Member]
Assets
Receivables	(1,581)	(1,953)
Total current assets	(1,581)	(1,953)
Investment in subsidiaries	(8,492,557)	(4,555,233)
Note receivable from Arch Western	(225,000)	(225,000)
Total other assets	(8,717,557)	(4,780,233)
Total assets	(8,719,138)	(4,782,186)
Liabilities and Stockholders' Equity
Accrued expenses and other current liabilities	(1,581)	(1,953)
Total current liabilities	(1,581)	(1,953)
Note payable to Arch Coal	(225,000)	(225,000)
Total liabilities	(226,581)	(226,953)
Stockholders' equity	(8,492,557)	(4,555,233)
Total liabilities and stockholders' equity	$ (8,719,138)	$ (4,782,186)

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Accounting Policies

6 Months Ended

Jun. 30, 2011

Accounting Policies

Accounting Policies

2. Accounting Policies

There is no new accounting guidance that is expected to have a significant impact on the Company's financial statements.

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Stock-Based Compensation And Other Incentive Plans

6 Months Ended

Jun. 30, 2011

Stock-Based Compensation and Other Incentive Plans

Stock-Based Compensation And Other Incentive Plans

11. Stock-Based Compensation and Other Incentive Plans

During the six months ended June 30, 2011, the Company granted options to purchase approximately 0.7 million shares of common stock with a weighted average exercise price of $32.50 per share and a weighted average grant-date fair value of $14.38 per share. The options' fair value was determined using the Black-Scholes option pricing model, using a weighted average risk-free rate of 1.95%, a weighted average dividend yield of 1.23% and a weighted average volatility of 57.61%. The options' expected life is 4.5 years and the options vest ratably over three years. The options provide for the continuation of vesting after retirement for recipients that meet certain criteria. The expense for these options will be recognized through the date that the employee first becomes eligible to retire and is no longer required to provide service to earn all or part of the award. The Company also granted 107,700 shares of restricted stock during the six months ended June 30, 2011 at a weighted average grant-date fair value of $32.49 per share. The restricted stock vests after three years.

During the six months ended June 30, 2011, the Company awarded 3.4 million performance units as part of its long-term incentive ("LTI") plan. The total number of units earned by a participant is based on financial and operational performance measures, and may be paid out in cash or in shares of the Company's common stock. The Company recognizes compensation expense over the three-year term of the grant. Amounts unpaid for all grants under the LTI plan totaled $8.6 million and $6.4 million as of June 30, 2011 and December 31, 2010, respectively.

The Company recognized compensation expense from all stock-based and LTI plans of $2.4 million and $5.0 million for the three months ended June 30, 2011 and 2010, respectively. The Company recognized compensation expense from all stock-based and LTI plans of $9.2 million and $8.8 million for the six months ended June 30, 2011 and 2010, respectively. These expenses are primarily included in selling, general and administrative expenses in the accompanying condensed consolidated statements of income.

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Fair Value Measurements (Narrative) (Details) (USD $)			3 Months Ended	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 Level 3 [Member]	Jun. 30, 2011 Level 3 [Member]
Net unrealized losses related to level 3 financial instruments			$ 8,300,000	$ 3,500,000
Fair value of current senior notes and long-term debt	$ 4,300,000,000	$ 1,700,000,000

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Workers' Compensation Expense (Worker's Compensation Expense) (Details) (Workers' Compensation [Member], USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Workers' Compensation [Member]
Service cost	$ 246	$ 208	$ 439	$ 363
Interest cost	304	194	558	338
Net amortization	(160)	(382)	(261)	(930)
Net benefit cost (credit)	390	20	736	(229)
Traumatic injury claims and assessments	3,324	2,244	5,649	3,920
Total workers' compensation expense	$ 3,714	$ 2,264	$ 6,385	$ 3,691

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Supplemental Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statements Of Cash Flows) (Details) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash provided by (used in) operating activities	$ 314,200	$ 259,355
Investing Activities
Acquisition of ICG, net of cash acquired	(2,910,380)
Change in restricted cash	(74,814)
Capital expenditures	(107,725)	(171,958)
Proceeds from dispositions of property, plant and equipment	1,411	229
Purchases of investments and advances to affiliates	(38,059)	(14,249)
Additions to prepaid royalties	(25,212)	(23,466)
Cash used in investing activities	(3,154,779)	(209,444)
Financing Activities
Proceeds from the issuance of $2.0 billion in aggregate principal amount of senior notes	2,000,000
Proceeds from the sale of common stock	1,249,407
Payments to retire ICG debt	(307,984)
Increase in restricted cash for retirement of ICG debt	(260,663)
Net increase (decrease) in borrowings under lines of credit and commercial paper program	303,096	(15,555)
Net (payments) and proceeds from other debt	(8,845)	(8,249)
Debt financing costs	(112,334)	(437)
Dividends paid	(34,192)	(30,870)
Issuance of common stock under incentive plans	846	137
Contribution from noncontrolling interest		891
Cash provided by (used in) financing activities	2,829,331	(54,083)
Increase (decrease) in cash and cash equivalents	(11,248)	(4,172)
Cash and cash equivalents, beginning of period	93,593	61,138
Cash and cash equivalents, end of period	82,345	56,966
Parent/Issuer [Member]
Cash provided by (used in) operating activities	(109,358)	(134,960)
Investing Activities
Acquisition of ICG, net of cash acquired	(2,910,380)
Change in restricted cash	(74,814)
Capital expenditures	(2,459)	(1,006)
Purchases of investments and advances to affiliates	(725,938)	(11,303)
Cash used in investing activities	(3,713,591)	(12,309)
Financing Activities
Proceeds from the issuance of $2.0 billion in aggregate principal amount of senior notes	2,000,000
Proceeds from the sale of common stock	1,249,407
Net increase (decrease) in borrowings under lines of credit and commercial paper program	360,000	(55,000)
Net (payments) and proceeds from other debt	(8,845)	(8,249)
Debt financing costs	(112,326)	(32)
Dividends paid	(34,192)	(30,870)
Issuance of common stock under incentive plans	846	137
Transactions with affiliates, net	363,696	211,424
Cash provided by (used in) financing activities	3,818,586	117,410
Increase (decrease) in cash and cash equivalents	(4,363)	(29,859)
Cash and cash equivalents, beginning of period	13,713	54,255
Cash and cash equivalents, end of period	9,350	24,396
Guarantor Subsidiaries [Member]
Cash provided by (used in) operating activities	278,596	240,408
Investing Activities
Capital expenditures	(65,927)	(123,761)
Proceeds from dispositions of property, plant and equipment	1,315	155
Purchases of investments and advances to affiliates	(27,058)	(2,946)
Additions to prepaid royalties	(21,440)	(20,831)
Cash used in investing activities	(113,110)	(147,383)
Financing Activities
Contributions from parent	714,937
Payments to retire ICG debt	(307,984)
Increase in restricted cash for retirement of ICG debt	(260,663)
Transactions with affiliates, net	(309,706)	(93,025)
Cash provided by (used in) financing activities	(163,416)	(93,025)
Increase (decrease) in cash and cash equivalents	2,070
Cash and cash equivalents, beginning of period	64	64
Cash and cash equivalents, end of period	2,134	64
Non-Guarantor Subsidiaries [Member]
Cash provided by (used in) operating activities	144,962	153,907
Investing Activities
Capital expenditures	(39,339)	(47,191)
Proceeds from dispositions of property, plant and equipment	96	74
Additions to prepaid royalties	(3,772)	(2,635)
Cash used in investing activities	(43,015)	(49,752)
Financing Activities
Net increase (decrease) in borrowings under lines of credit and commercial paper program	(56,904)	39,445
Debt financing costs	(8)	(405)
Contribution from noncontrolling interest		891
Transactions with affiliates, net	(53,990)	(118,399)
Cash provided by (used in) financing activities	(110,902)	(78,468)
Increase (decrease) in cash and cash equivalents	(8,955)	25,687
Cash and cash equivalents, beginning of period	79,816	6,819
Cash and cash equivalents, end of period	70,861	32,506
Eliminations [Member]
Investing Activities
Purchases of investments and advances to affiliates	714,937
Cash used in investing activities	714,937
Financing Activities
Contributions from parent	(714,937)
Cash provided by (used in) financing activities	$ (714,937)

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Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2011

Comprehensive Income

Components Of Comprehensive Income

	Three Months Ended June 30						Six Months Ended June 30
	2011			2010			2011			2010
	(In thousands)						(In thousands)
Net income attributable to Arch Coal, Inc.	$	11,079		$	66,156		$	66,680		$	64,360
Other comprehensive income, net of income taxes:
Pension, postretirement and other post-employment benefits, reclassifications into net income	293			(536		)	866			56
Unrealized losses on available-for-sale securities	(1,434		)	(925		)	(687		)	(916		)
Unrealized gains and losses on derivatives, net of reclassifications into net income:
Unrealized gains (losses) on derivatives	(3,127		)	(5,451		)	6,374			(5,089		)
Reclassifications of (gains) losses into net income	(4,360		)	(506		)	(6,484		)	1,217
Total comprehensive income	$	2,451		$	58,738		$	66,749		$	59,628

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Earnings Per Common Share

6 Months Ended

Jun. 30, 2011

Earnings Per Common Share

Earnings Per Common Share

15. Earnings per Common Share

The following table provides the basis for earnings per share calculations by reconciling basic and diluted weighted average shares outstanding:

	Three Months Ended June 30		Six Months Ended June 30
	2011	2010	2011	2010
	(In thousands)		(In thousands)
Weighted average shares outstanding:
Basic weighted average shares outstanding	174,244	162,388	168,442	162,380
Effect of common stock equivalents under incentive plans	1,028	742	1,112	725
Diluted weighted average shares outstanding	175,272	163,130	169,554	163,105

The effect of options to purchase 2.3 million and 2.4 million shares of common stock were excluded from the calculation of diluted weighted average shares outstanding for the three month periods ended June 30, 2011 and 2010, respectively, because the exercise price of these options exceeded the average market price of the Company's common stock for these periods. The effect of options to purchase 1.7 million and 2.4 million shares of common stock were excluded from the calculation of diluted weighted average shares outstanding for the six month periods ended June 30, 2011 and 2010, respectively, because the exercise price of these options exceeded the average market price of the Company's common stock for these periods.

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Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
REVENUES
Coal sales	$ 985,087	$ 764,295	$ 1,858,025	$ 1,476,169
COSTS, EXPENSES AND OTHER
Cost of coal sales	709,953	570,861	1,363,637	1,121,611
Depreciation, depletion and amortization	95,183	87,759	178,720	176,278
Amortization of acquired sales contracts, net	1,489	5,214	7,433	15,967
Selling, general and administrative expenses	29,039	35,344	59,474	62,510
Change in fair value of coal derivatives and coal trading activities, net	2,672	4,587	888	10,464
Acquisition and transition costs related to ICG	48,666		48,666
Gain on Knight Hawk transaction		(41,577)		(41,577)
Other operating income, net	(4,732)	(4,392)	(5,848)	(7,783)
Total operating expenses	882,270	657,796	1,652,970	1,337,470
Income from operations	102,817	106,499	205,055	138,699
Interest expense, net:
Interest expense	(42,249)	(35,125)	(76,829)	(70,208)
Interest income	755	623	1,501	961
Interest expense, net	(41,494)	(34,502)	(75,328)	(69,247)
Other non-operating expense:
Bridge financing costs related to ICG	(49,490)		(49,490)
Net loss resulting from early retirement of ICG debt	(250)		(250)
Other non-operating expense, Total	(49,740)		(49,740)
Income before income taxes	11,583	71,997	79,987	69,452
Provision for income taxes	186	5,723	12,716	4,948
Net income	11,397	66,274	67,271	64,504
Less: Net income attributable to noncontrolling interest	(318)	(118)	(591)	(144)
Net income attributable to Arch Coal, Inc.	$ 11,079	$ 66,156	$ 66,680	$ 64,360
EARNINGS PER COMMON SHARE
Basic earnings per common share	$ 0.06	$ 0.41	$ 0.40	$ 0.40
Diluted earnings per common share	$ 0.06	$ 0.41	$ 0.39	$ 0.40
Basic weighted average shares outstanding	174,244	162,388	168,442	162,380
Diluted weighted average shares outstanding	175,272	163,130	169,554	163,105
Dividends declared per common share	$ 0.11	$ 0.1	$ 0.21	$ 0.19

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2011

Segment Information

Schedule Of Operating Segment Results

	PRB		APP			WBIT		OtherOperatingSegments		Corporate,Other andEliminations			Consolidated
	(In thousands)
Three months ended June 30, 2011
Coal sales	$	391,413	$	400,792		$	189,154	$	3,728	$	—		$	985,087
Income from operations	35,615		97,876			43,672		317		(74,663		)	102,817
Depreciation, depletion and amortization	41,165		31,025			22,099		605		289			95,183
Amortization of acquired sales contracts, net	5,603		(4,123		)	—		9		—			1,489
Capital expenditures	15,647		29,288			10,115		4,328		9,636			69,014
Three months ended June 30, 2010
Coal sales	$	370,499	$	261,646		$	132,150	$	—	$	—		$	764,295
Income from operations	33,177		54,079			13,876		—		5,367			106,499
Depreciation, depletion and amortization	44,433		24,581			18,390		—		355			87,759
Amortization of acquired sales contracts, net	5,214		—			—		—		—			5,214
Capital expenditures	3,725		12,972			20,703		—		102,583			139,983
Six months ended June 30, 2011
Coal sales	$	784,526	$	725,178		$	344,593	$	3,728	$	—		$	1,858,025
Income from operations	82,489		152,270			70,564		317		(100,585		)	205,055
Total assets	2,212,818		5,208,551			679,231		217,765		1,833,080			10,151,445
Depreciation, depletion and amortization	82,856		52,041			42,628		605		590			178,720
Amortization of acquired sales contracts, net	11,547		(4,123		)	—		9		—			7,433
Capital expenditures	18,485		46,590			21,892		4,373		16,385			107,725
Six months ended June 30, 2010
Coal sales	$	729,914	$	481,392		$	264,863	$	—	$	—		$	1,476,169
Income from operations	49,738		91,672			26,306		—		(29,017		)	138,699
Total assets	2,331,449		725,588			682,565		—		1,150,938			4,890,540
Depreciation, depletion and amortization	89,054		47,755			38,760		—		709			176,278
Amortization of acquired sales contracts, net	15,967		—			—		—		—			15,967
Capital expenditures	4,450		24,609			33,804		—		109,095			171,958

Reconciliation Statement Of Segment Income From Operations To Consolidated Income Before Income Taxes

	Three Months Ended June 30						Six Months Ended June 30
	2011			2010			2011			2010
	(In thousands)						(In thousands)
Income from operations	$	102,817		$	106,499		$	205,055		$	138,699
Interest expense	(42,249		)	(35,125		)	(76,829		)	(70,208		)
Interest income	755			623			1,501			961
Bridge financing costs related to ICG	(49,490		)	—			(49,490		)	—
Net loss resulting from early retirement of ICG debt	(250		)	—			(250		)	—
Income before income taxes	$	11,583		$	71,997		$	79,987		$	69,452

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Investments (Schedule Of Equity Method Investments) (Details) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jan. 31, 2011
Balance at December 31, 2010	$ 177,451
Investments in affiliates	33,980
Advances to (distributions from) affiliates, net	(9,591)
Equity in comprehensive income (loss)	5,806
Balance at June 30, 2011	207,646
Balance at December 31, 2010	23,900
Balance at June 30, 2011	29,300
Knight Hawk [Member]
Balance at December 31, 2010	131,250
Advances to (distributions from) affiliates, net	(9,591)
Equity in comprehensive income (loss)	9,981
Balance at June 30, 2011	131,640
Balance at December 31, 2010	1,700
DKRW [Member]
Balance at December 31, 2010	21,961
Equity in comprehensive income (loss)	(1,079)
Balance at June 30, 2011	20,882
Balance at December 31, 2010	18,100
Balance at June 30, 2011	24,700
DTA [Member]
Balance at December 31, 2010	14,472
Investments in affiliates	2,910
Equity in comprehensive income (loss)	(2,207)
Balance at June 30, 2011	15,175
Tenaska [Member]
Balance at December 31, 2010	9,768
Investments in affiliates	5,500
Equity in comprehensive income (loss)	(2)
Balance at June 30, 2011	15,266
Balance at December 31, 2010	4,100
Balance at June 30, 2011	4,600
Millennium [Member]
Balance at December 31, 2010		25,000
Investments in affiliates	25,570
Equity in comprehensive income (loss)	(887)
Balance at June 30, 2011	$ 24,683	$ 25,000

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Fair Value Measurements (Summary Of Change In The Fair Values Of Financial Instruments Categorized As Level 3) (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011
Fair Value Measurements
Balance, beginning of period	$ 15,781	$ 9,183
Realized and unrealized losses recognized in earnings	(4,545)	(7,124)
Realized and unrealized gains (losses) recognized in other comprehensive income	(5,453)	3,475
Purchases	9,006	10,472
Issuances	(2,160)	(2,160)
Settlements	(2,155)	(3,372)
Balance, end of period	$ 10,474	$ 10,474

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Supplemental Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statements Of Income) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenue
Coal sales	$ 985,087	$ 764,295	$ 1,858,025	$ 1,476,169
Costs, expenses and other
Cost of coal sales	709,953	570,861	1,363,637	1,121,611
Depreciation, depletion and amortization	95,183	87,759	178,720	176,278
Amortization of acquired sales contracts, net	1,489	5,214	7,433	15,967
Selling, general and administrative expenses	29,039	35,344	59,474	62,510
Change in fair value of coal derivatives and coal trading activities, net	2,672	4,587	888	10,464
Acquisition and transition costs related to ICG	48,666		48,666
Gain on Knight Hawk transaction		(41,577)		(41,577)
Other operating (income) expense, net	(4,732)	(4,392)	(5,848)	(7,783)
Total operating expenses	882,270	657,796	1,652,970	1,337,470
Income from operations	102,817	106,499	205,055	138,699
Interest expense	(42,249)	(35,125)	(76,829)	(70,208)
Interest income	755	623	1,501	961
Interest expense, net	(41,494)	(34,502)	(75,328)	(69,247)
Bridge financing costs related to ICG	(49,490)		(49,490)
Net loss resulting from early retirement of ICG debt	(250)		(250)
Other non-operating expense, Total	(49,740)		(49,740)
Income before income taxes	11,583	71,997	79,987	69,452
Provision for income taxes	186	5,723	12,716	4,948
Net income	11,397	66,274	67,271	64,504
Less: Net income attributable to noncontrolling interest	(318)	(118)	(591)	(144)
Net income attributable to Arch Coal, Inc.	11,079	66,156	66,680	64,360
Parent/Issuer [Member]
Costs, expenses and other
Cost of coal sales	4,940	2,148	8,219	4,976
Depreciation, depletion and amortization	659	725	1,331	1,476
Selling, general and administrative expenses	18,600	23,251	38,936	41,894
Acquisition and transition costs related to ICG	48,666		48,666
Other operating (income) expense, net	(4,831)	(2,818)	(9,398)	(4,778)
Total operating expenses	68,034	23,306	87,754	43,568
Income from investment in subsidiaries	172,831	126,555	297,834	173,820
Income from operations	104,797	103,249	210,080	130,252
Interest expense	(47,824)	(33,524)	(88,445)	(64,955)
Interest income	4,100	2,272	7,842	4,155
Interest expense, net	(43,724)	(31,252)	(80,603)	(60,800)
Bridge financing costs related to ICG	(49,490)		(49,490)
Other non-operating expense, Total	(49,490)		(49,490)
Income before income taxes	11,583	71,997	79,987	69,452
Provision for income taxes	186	5,723	12,716	4,948
Net income	11,397	66,274	67,271	64,504
Less: Net income attributable to noncontrolling interest	(318)	(118)	(591)	(144)
Net income attributable to Arch Coal, Inc.	11,079	66,156	66,680	64,360
Guarantor Subsidiaries [Member]
Revenue
Coal sales	419,454	282,817	757,988	521,845
Costs, expenses and other
Cost of coal sales	282,535	193,243	534,420	361,961
Depreciation, depletion and amortization	54,008	46,941	97,288	90,659
Amortization of acquired sales contracts, net	(4,113)		(4,113)
Selling, general and administrative expenses	3,170	1,836	5,053	3,642
Change in fair value of coal derivatives and coal trading activities, net	2,672	4,587	888	10,464
Gain on Knight Hawk transaction		(41,577)		(41,577)
Other operating (income) expense, net	(29,687)	(26,202)	(57,143)	(48,924)
Total operating expenses	308,585	178,828	576,393	376,225
Income from operations	110,869	103,989	181,595	145,620
Interest expense	(1,924)	(780)	(2,638)	(1,359)
Interest income	135	75	432	164
Interest expense, net	(1,789)	(705)	(2,206)	(1,195)
Net loss resulting from early retirement of ICG debt	(250)		(250)
Other non-operating expense, Total	(250)		(250)
Income before income taxes	108,830	103,284	179,139	144,425
Net income	108,830	103,284	179,139	144,425
Net income attributable to Arch Coal, Inc.	108,830	103,284	179,139	144,425
Non-Guarantor Subsidiaries [Member]
Revenue
Coal sales	565,633	481,478	1,100,037	954,324
Costs, expenses and other
Cost of coal sales	447,707	396,568	871,030	794,079
Depreciation, depletion and amortization	40,516	40,093	80,101	84,143
Amortization of acquired sales contracts, net	5,602	5,214	11,546	15,967
Selling, general and administrative expenses	9,104	12,006	19,017	20,409
Other operating (income) expense, net	2,722	1,781	7,129	3,079
Total operating expenses	505,651	455,662	988,823	917,677
Income from operations	59,982	25,816	111,214	36,647
Interest expense	(10,962)	(18,387)	(21,944)	(36,503)
Interest income	14,981	15,842	29,425	29,251
Interest expense, net	4,019	(2,545)	7,481	(7,252)
Income before income taxes	64,001	23,271	118,695	29,395
Net income	64,001	23,271	118,695	29,395
Net income attributable to Arch Coal, Inc.	64,001	23,271	118,695	29,395
Eliminations [Member]
Costs, expenses and other
Cost of coal sales	(25,229)	(21,098)	(50,032)	(39,405)
Selling, general and administrative expenses	(1,835)	(1,749)	(3,532)	(3,435)
Other operating (income) expense, net	27,064	22,847	53,564	42,840
Income from investment in subsidiaries	(172,831)	(126,555)	(297,834)	(173,820)
Income from operations	(172,831)	(126,555)	(297,834)	(173,820)
Interest expense	18,461	17,566	36,198	32,609
Interest income	(18,461)	(17,566)	(36,198)	(32,609)
Income before income taxes	(172,831)	(126,555)	(297,834)	(173,820)
Net income	(172,831)	(126,555)	(297,834)	(173,820)
Net income attributable to Arch Coal, Inc.	$ (172,831)	$ (126,555)	$ (297,834)	$ (173,820)

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Debt (Debt) (Details) (USD $)	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Commercial paper		$ 56,904,000
Indebtedness to banks under credit facilities	360,000,000
Other	10,264,000	14,093,000
Total	4,202,533,000	1,609,741,000
Less current maturities of debt and short-term borrowings	428,610,000	70,997,000
Long-term debt	3,773,923,000	1,538,744,000
7.00% Senior Notes Due June 15, 2019 [Member]
Senior notes	1,000,000,000
Senior notes interest rate	7.00%
Due date of senior notes	Jun. 15, 2019
7.25% Senior Notes Due June 15, 2021 [Member]
Senior notes	1,000,000,000
Senior notes interest rate	7.25%
Due date of senior notes	Jun. 15, 2021
9.125% Senior Notes Due April 1, 2018 [Member]
Senior notes	250,000,000
Face value of senior notes	200,000,000
Senior notes interest rate	9.125%
Due date of senior notes	Apr. 01, 2018
4.00% Convertible Senior Notes Due April 1, 2017 [Member]
Senior notes	42,902,000
Face value of senior notes	16,500,000
Senior notes interest rate	4.00%
Due date of senior notes	Apr. 01, 2017
9.00% Convertible Senior Notes Due August 1, 2012 [Member]
Senior notes	44,000
Face value of senior notes	18,000
Senior notes interest rate	9.00%
Due date of senior notes	Aug. 01, 2012
6.75% Senior Notes Due July 1, 2013 [Member]
Senior notes	451,294,000	451,618,000
Face value of senior notes	450,000,000
Senior notes interest rate	6.75%
Due date of senior notes	Jul. 01, 2013
8.75% Senior Notes Due August 1, 2016 [Member]
Senior notes	588,029,000	587,126,000
Face value of senior notes	600,000,000
Senior notes interest rate	8.75%
Due date of senior notes	Aug. 01, 2016
7.25% Senior Notes Due October 1, 2020 [Member]
Senior notes	$ 500,000,000	$ 500,000,000
Senior notes interest rate	7.25%
Due date of senior notes	Oct. 01, 2020

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Acquired Sales Contracts (Narrative) (Details) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011
Coal supply agreement asset, purchase price allocation	$ 43.3
Coal supply agreement liability, purchase price allocation	121.0
Amortization expense (income) of acquired sales contracts year one	41.0
Amortization expense (income) of acquired sales contracts year two	10.0
Amortization expense (income) of acquired sales contracts year three	6.0
Amortization expense (income) of acquired sales contracts year four	9.0
Amortization expense (income) of acquired sales contracts year five	13.0
Current Asset [Member]
Business acquisition current assets	22.7
Current Liabilities [Member]
Business acquisition current liabilities	$ 75.4

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Inventories (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Inventories
Coal	$ 189,989,000	$ 115,647,000
Repair parts and supplies, net of allowance	160,212,000	119,969,000
Inventories	350,201,000	235,616,000
Repair parts and supplies stated net of an allowance for slow-moving and obsolete inventories	$ 13,100,000	$ 12,700,000

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Supplemental Condensed Consolidating Financial Information (Tables)

6 Months Ended

Jun. 30, 2011

Supplemental Condensed Consolidating Financial Information

Schedule Of Condensed Consolidating Statements Of Income

Condensed Consolidating Statements of Income

Three Months Ended June 30, 2011

(unaudited)

	Parent/Issuer			Guarantor Subsidiaries			Non-GuarantorSubsidiaries			Eliminations			Consolidated
	(In thousands)
Revenue
Coal sales	$	—		$	419,454		$	565,633		$	—		$	985,087
Costs, expenses and other
Cost of coal sales	4,940			282,535			447,707			(25,229		)	709,953
Depreciation, depletion and amortization	659			54,008			40,516			—			95,183
Amortization of acquired sales contracts, net	—			(4,113		)	5,602			—			1,489
Selling, general and administrative expenses	18,600			3,170			9,104			(1,835		)	29,039
Change in fair value of coal derivatives and coal trading activities, net	—			2,672			—			—			2,672
Acquisition and transition costs related to ICG	48,666			—			—			—			48,666
Other operating (income) expense, net	(4,831		)	(29,687		)	2,722			27,064			(4,732		)
	68,034			308,585			505,651			—			882,270
Income from investment in subsidiaries	172,831			—			—			(172,831		)	—
Income from operations	104,797			110,869			59,982			(172,831		)	102,817
Interest income (expense), net:
Interest expense	(47,824		)	(1,924		)	(10,962		)	18,461			(42,249		)
Interest income	4,100			135			14,981			(18,461		)	755
	(43,724		)	(1,789		)	4,019			—			(41,494		)
Other non-operating expense:
Bridge financing costs related to ICG	(49,490		)	—			—			—			(49,490		)
Net loss resulting from early retirement of ICG debt	—			(250		)	—			—			(250		)
	(49,490		)	(250		)	—			—			(49,740		)
Income before income taxes	11,583			108,830			64,001			(172,831		)	11,583
Provision for income taxes	186			—			—			—			186
Net income	11,397			108,830			64,001			(172,831		)	11,397
Less: Net income attributable to noncontrolling interest	(318		)	—			—			—			(318		)
Net income attributable to Arch Coal	$	11,079		$	108,830		$	64,001		$	(172,831	)	$	11,079

Condensed Consolidating Statements of Income

Three Months Ended June 30, 2010

(unaudited)

	Parent/Issuer			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	(In thousands)
Revenue
Coal sales	$	—		$	282,817		$	481,478		$	—		$	764,295
Costs, expenses and other
Cost of coal sales	2,148			193,243			396,568			(21,098		)	570,861
Depreciation, depletion and amortization	725			46,941			40,093			—			87,759
Amortization of acquired sales contracts, net	—			—			5,214			—			5,214
Selling, general and administrative expenses	23,251			1,836			12,006			(1,749		)	35,344
Change in fair value of coal derivatives and coal trading activities, net	—			4,587			—			—			4,587
Gain on Knight Hawk transaction	—			(41,577		)	—			—			(41,577		)
Other operating (income) expense, net	(2,818		)	(26,202		)	1,781			22,847			(4,392		)
	23,306			178,828			455,662			—			657,796
Income from investment in subsidiaries	126,555			—			—			(126,555		)	—
Income from operations	103,249			103,989			25,816			(126,555		)	106,499
Interest expense, net:
Interest expense	(33,524		)	(780		)	(18,387		)	17,566			(35,125		)
Interest income	2,272			75			15,842			(17,566		)	623
	(31,252		)	(705		)	(2,545		)	—			(34,502		)
Income before income taxes	71,997			103,284			23,271			(126,555		)	71,997
Provision for income taxes	5,723			—			—			—			5,723
Net income	66,274			103,284			23,271			(126,555		)	66,274
Less: Net income attributable to noncontrolling interest	(118		)	—			—			—			(118		)
Net income attributable to Arch Coal	$	66,156		$	103,284		$	23,271		$	(126,555	)	$	66,156

Condensed Consolidating Statements of Income

Six Months Ended June 30, 2011

(unaudited)

	Parent/Issuer			GuarantorSubsidiaries			Non-GuarantorSubsidiaries			Eliminations			Consolidated
	(In thousands)
Revenue
Coal sales	$	—		$	757,988		$	1,100,037		$	—		$	1,858,025
Costs, expenses and other
Cost of coal sales	8,219			534,420			871,030			(50,032		)	1,363,637
Depreciation, depletion and amortization	1,331			97,288			80,101			—			178,720
Amortization of acquired sales contracts, net	—			(4,113		)	11,546			—			7,433
Selling, general and administrative expenses	38,936			5,053			19,017			(3,532		)	59,474
Change in fair value of coal derivatives and coal trading activities, net	—			888			—			—			888
Acquisition and transition costs related to ICG	48,666			—			—			—			48,666
Other operating (income) expense, net	(9,398		)	(57,143		)	7,129			53,564			(5,848		)
	87,754			576,393			988,823			—			1,652,970
Income from investment in subsidiaries	297,834			—			—			(297,834		)	—
Income from operations	210,080			181,595			111,214			(297,834		)	205,055
Interest income (expense), net:
Interest expense	(88,445		)	(2,638		)	(21,944		)	36,198			(76,829		)
Interest income	7,842			432			29,425			(36,198		)	1,501
	(80,603		)	(2,206		)	7,481			—			(75,328		)
Other non-operating expense:
Bridge financing costs related to ICG	(49,490		)	—			—			—			(49,490		)
Net loss resulting from early retirement of ICG debt	—			(250		)	—			—			(250		)
	(49,490		)	(250		)	—			—			(49,740		)
Income before income taxes	79,987			179,139			118,695			(297,834		)	79,987
Provision for income taxes	12,716			—			—			—			12,716
Net income	67,271			179,139			118,695			(297,834		)	67,271
Less: Net income attributable to noncontrolling interest	(591		)	—			—			—			(591		)
Net income attributable to Arch Coal	$	66,680		$	179,139		$	118,695		$	(297,834	)	$	66,680

Condensed Consolidating Statements of Income

Six Months Ended June 30, 2010

(unaudited)

	Parent/Issuer			GuarantorSubsidiaries			Non-GuarantorSubsidiaries			Eliminations			Consolidated
	(In thousands)
Revenue
Coal sales	$	—		$	521,845		$	954,324		$	—		$	1,476,169
Costs, expenses and other
Cost of coal sales	4,976			361,961			794,079			(39,405		)	1,121,611
Depreciation, depletion and amortization	1,476			90,659			84,143			—			176,278
Amortization of acquired sales contracts, net	—			—			15,967			—			15,967
Selling, general and administrative expenses	41,894			3,642			20,409			(3,435		)	62,510
Change in fair value of coal derivatives and coal trading activities, net	—			10,464			—			—			10,464
Gain on Knight Hawk transaction	—			(41,577		)	—			—			(41,577		)
Other operating (income) expense, net	(4,778		)	(48,924		)	3,079			42,840			(7,783		)
	43,568			376,225			917,677			—			1,337,470
Income from investment in subsidiaries	173,820			—			—			(173,820		)	—
Income from operations	130,252			145,620			36,647			(173,820		)	138,699
Interest expense, net:
Interest expense	(64,955		)	(1,359		)	(36,503		)	32,609			(70,208		)
Interest income	4,155			164			29,251			(32,609		)	961
	(60,800		)	(1,195		)	(7,252		)	—			(69,247		)
Income before income taxes	69,452			144,425			29,395			(173,820		)	69,452
Provision for income taxes	4,948			—			—			—			4,948
Net income	64,504			144,425			29,395			(173,820		)	64,504
Less: Net income attributable to noncontrolling interest	(144		)	—			—			—			(144		)
Net income attributable to Arch Coal	$	64,360		$	144,425		$	29,395		$	(173,820	)	$	64,360

Schedule Of Condensed Consolidating Balance Sheets

Condensed Consolidating Balance Sheets

June 30, 2011

(unaudited)

				Guarantor		Non-Guarantor
	Parent/Issuer			Subsidiaries		Subsidiaries		Eliminations			Consolidated
	(In thousands)
Assets
Cash and cash equivalents	$	9,350		$	2,134	$	70,861	$	—		$	82,345
Restricted cash	74,814			276,152		—		—			350,966
Receivables	51,241			134,803		241,653		(1,581		)	426,116
Inventories	—			177,614		172,587		—			350,201
Other	29,418			133,887		15,732		—			179,037
Total current assets	164,823			724,590		500,833		(1,581		)	1,388,665
Property, plant and equipment, net	11,268			6,257,368		1,457,820		—			7,726,456
Investment in subsidiaries	8,492,557			—		—		(8,492,557		)	—
Intercompany receivables	(2,160,682		)	818,816		1,341,866		—			—
Note receivable from Arch Western	225,000			—		—		(225,000		)	—
Other	445,302			577,022		14,000		—			1,036,324
Total other assets	7,002,177			1,395,838		1,355,866		(8,717,557		)	1,036,324
Total assets	$	7,178,268		$	8,377,796	$	3,314,519	$	(8,719,138	)	$	10,151,445
Liabilities and Stockholders' Equity
Accounts payable	$	26,716		$	164,243	$	95,478	$	—		$	286,437
Accrued expenses and other current liabilities	86,198			164,682		151,512		(1,581		)	400,811
Current maturities of debt and short-term borrowings	131,750			296,860		—		—			428,610
Total current liabilities	244,664			625,785		246,990		(1,581		)	1,115,858
Long-term debt	3,321,528			1,101		451,294		—			3,773,923
Note payable to Arch Coal	—			—		225,000		(225,000		)	—
Asset retirement obligations	622			105,428		306,274		—			412,324
Accrued pension benefits	13,087			4,333		18,627		—			36,047
Accrued postretirement benefits other than pension	14,888			49,734		23,004		—			87,626
Accrued workers' compensation	15,042			43,140		6,845		—			65,027
Deferred income taxes	(20,679		)	884,649		—		—			863,970
Other noncurrent liabilities	50,707			171,002		36,552		—			258,261
Total liabilities	3,639,859			1,885,172		1,314,586		(226,581		)	6,613,036
Redeemable noncontrolling interest	11,032			—		—		—			11,032
Stockholders' equity	3,527,377			6,492,624		1,999,933		(8,492,557		)	3,527,377
Total liabilities and stockholders' equity	$	7,178,268		$	8,377,796	$	3,314,519	$	(8,719,138	)	$	10,151,445

Condensed Consolidating Balance Sheets

December 31, 2010

(unaudited)

	Parent/Issuer			GuarantorSubsidiaries		Non-GuarantorSubsidiaries		Eliminations			Consolidated
	(In thousands)
Assets
Cash and cash equivalents	$	13,713		$	64	$	79,816	$	—		$	93,593
Receivables	31,458			12,740		210,075		(1,953		)	252,320
Inventories	—			85,196		150,420		—			235,616
Other	29,575			102,375		21,435		—			153,385
Total current assets	74,746			200,375		461,746		(1,953		)	734,914
Property, plant and equipment, net	9,817			1,800,578		1,498,497		—			3,308,892
Investment in subsidiaries	4,555,233			—		—		(4,555,233		)	—
Intercompany receivables	(1,807,902		)	508,624		1,299,278		—			—
Note receivable from Arch Western	225,000			—		—		(225,000		)	—
Other	481,345			344,698		10,920		—			836,963
Total other assets	3,453,676			853,322		1,310,198		(4,780,233		)	836,963
Total assets	$	3,538,239		$	2,854,275	$	3,270,441	$	(4,782,186	)	$	4,880,769
Liabilities and Stockholders' Equity
Accounts payable	$	10,753		$	65,793	$	121,670	$	—		$	198,216
Accrued expenses and other current liabilities	75,746			31,123		153,217		(1,953		)	258,133
Current maturities of debt and short-term borrowings	14,093			—		56,904		—			70,997
Total current liabilities	100,592			96,916		331,791		(1,953		)	527,346
Long-term debt	1,087,126			—		451,618		—			1,538,744
Note payable to Arch Coal	—			—		225,000		(225,000		)	—
Asset retirement obligations	873			32,029		301,355		—			334,257
Accrued pension benefits	20,843			4,407		23,904		—			49,154
Accrued postretirement benefits other than pension	14,284			—		23,509		—			37,793
Accrued workers' compensation	15,383			13,805		6,102		—			35,290
Other noncurrent liabilities	51,187			22,135		36,912		—			110,234
Total liabilities	1,290,288			169,292		1,400,191		(226,953		)	2,632,818
Redeemable noncontrolling interest	10,444			—		—		—			10,444
Stockholders' equity	2,237,507			2,684,983		1,870,250		(4,555,233		)	2,237,507
Total liabilities and stockholders' equity	$	3,538,239		$	2,854,275	$	3,270,441	$	(4,782,186	)	$	4,880,769

Schedule Of Condensed Consolidating Statements Of Cash Flows

Condensed Consolidating Statements of Cash Flows

Six Months Ended June 30, 2011

(unaudited)

				Guarantor			Non-Guarantor
	Parent/Issuer			Subsidiaries			Subsidiaries			Eliminations			Consolidated
	(In thousands)
Cash provided by (used in) operating activities	$	(109,358	)	$	278,596		$	144,962		$	—		$	314,200
Investing Activities
Acquisition of ICG, net of cash acquired	(2,910,380		)	—			—			—			(2,910,380		)
Change in restricted cash	(74,814		)	—			—			—			(74,814		)
Capital expenditures	(2,459		)	(65,927		)	(39,339		)	—			(107,725		)
Proceeds from dispositions of property, plant and equipment	—			1,315			96			—			1,411
Purchases of investments and advances to affiliates	(725,938		)	(27,058		)	—			714,937			(38,059		)
Additions to prepaid royalties	—			(21,440		)	(3,772		)	—			(25,212		)
Cash used in investing activities	(3,713,591		)	(113,110		)	(43,015		)	714,937			(3,154,779		)
Financing Activities
Proceeds from the issuance of senior notes	2,000,000			—			—			—			2,000,000
Proceeds from the issuance of common stock, net	1,249,407			—			—			—			1,249,407
Contributions from parent	—			714,937						(714,937		)	—
Payments to retire ICG debt	—			(307,984		)	—			—			(307,984		)
Increase in restricted cash for retirement of ICG debt	—			(260,663		)	—			—			(260,663		)
Net increase (decrease) in borrowings under lines of credit and commercial paper program	360,000			—			(56,904		)	—			303,096
Net payments on other debt	(8,845		)	—			—			—			(8,845		)
Debt financing costs	(112,326		)	—			(8		)	—			(112,334		)
Dividends paid	(34,192		)	—			—			—			(34,192		)
Issuance of common stock under incentive plans	846			—			—			—			846
Transactions with affiliates, net	363,696			(309,706		)	(53,990		)	—			—
Cash provided by (used in) financing activities	3,818,586			(163,416		)	(110,902		)	(714,937		)	2,829,331
Increase (decrease) in cash and cash equivalents	(4,363		)	2,070			(8,955		)	—			(11,248		)
Cash and cash equivalents, beginning of period	13,713			64			79,816			—			93,593
Cash and cash equivalents, end of period	$	9,350		$	2,134		$	70,861		$	—		$	82,345

Condensed Consolidating Statements of Cash Flows

Six Months Ended June 30, 2010

(unaudited)

	Parent/Issuer			GuarantorSubsidiaries			Non-GuarantorSubsidiaries			Consolidated
	(in thousands)
Cash provided by (used in) operating activities	$	(134,960	)	$	240,408		$	153,907		$	259,355
Investing Activities
Capital expenditures	(1,006		)	(123,761		)	(47,191		)	(171,958		)
Proceeds from dispositions of property, plant and equipment	—			155			74			229
Purchases of investments and advances to affiliates	(11,303		)	(2,946		)	—			(14,249		)
Additions to prepaid royalties	—			(20,831		)	(2,635		)	(23,466		)
Cash used in investing activities	(12,309		)	(147,383		)	(49,752		)	(209,444		)
Financing Activities
Net increase (decrease) in borrowings under lines of credit and commercial paper program	(55,000		)	—			39,445			(15,555		)
Net payments on other debt	(8,249		)	—			—			(8,249		)
Debt financing costs	(32		)	—			(405		)	(437		)
Dividends paid	(30,870		)	—			—			(30,870		)
Issuance of common stock under incentive plans	137			—			—			137
Contribution from noncontrolling interest	—			—			891			891
Transactions with affiliates, net	211,424			(93,025		)	(118,399		)	—
Cash provided by (used in) financing activities	117,410			(93,025		)	(78,468		)	(54,083		)
Increase (decrease) in cash and cash equivalents	(29,859		)	—			25,687			(4,172		)
Cash and cash equivalents, beginning of period	54,255			64			6,819			61,138
Cash and cash equivalents, end of period	$	24,396		$	64		$	32,506		$	56,966