Summary of Significant Accounting Policies (Policies)	12 Months Ended
Dec. 31, 2012
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation: The consolidated financial statements include the wholly-owned subsidiaries of the Company, the most significant of which are Empresa Minera Manquiri S.A., Coeur Mexicana S.A. de C.V., Coeur Rochester, Inc., Coeur Alaska, Inc., Coeur Argentina S.R.L. and CDE Australia Pty. Ltd. The consolidated financial statements also include all entities in which voting control of more than 50% is held by the Company. The Company has no investments in entities in which it has greater than 50% ownership interest accounted for using the equity method. Intercompany balances and transactions have been eliminated in consolidation. Investments in corporate joint ventures where the Company has ownership of 50% or less and funds its proportionate share of expenses are accounted for under the equity method. The Company has no investments in entities in which it has a greater than 20% ownership interest accounted for using the cost method.
Revenue Recognition	Revenue Recognition: Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred, the price is fixed or determinable, no obligations remain and collection is probable. The passing of title to the customer is based on the terms of the sales contract. Product pricing is determined at the point revenue is recognized by reference to active and freely traded commodity markets, for example the London Bullion Market for both gold and silver, in an identical form to the product sold. Under the Company’s concentrate sales contracts with third-party smelters, final gold and silver prices are set on a specified future quotational period, typically one to three months, after the shipment date based on market metal prices. Revenues and production costs applicable to sales are recorded on a gross basis under these contracts at the time title passes to the buyer based on the forward price for the expected settlement period. The contracts, in general, provide for provisional payment based upon provisional assays and quoted metal prices. Final settlement is based on the average applicable price for the specified future quotational period and generally occurs from three to six months after shipment. Final sales are settled using smelter weights and settlement assays (average of assays exchanged and/or umpire assay results) and are priced as specified in the smelter contract. The Company’s provisionally priced sales contain an embedded derivative that is required to be separated from the host contract for accounting purposes. The host contract is the receivable from the sale of concentrates measured at the forward price at the time of sale. The embedded derivative does not qualify for hedge accounting. The embedded derivative is recorded as a derivative asset in prepaid expenses and other assets or as a derivative liability in accrued liabilities and other on the consolidated balance sheet and is adjusted to fair value through revenue each period until the date of final gold and silver settlement. The form of the material being sold, after deduction for smelting and refining, is in an identical form to that sold on the London Bullion Market. The form of the product is metal in flotation concentrate, which is the final process for which the Company is responsible. Revenue includes the sales of by-product gold from the Company’s silver mining operations. The effects of forward sales contracts are reflected in revenue at the date the related precious metals are delivered or the contracts expire. Third-party smelting and refining costs of $16.6 million, $17.7 million and $8.6 million in 2012, 2011 and 2010, respectively, are recorded as a reduction of revenue. At December 31, 2012, the Company had outstanding provisionally priced sales of $33.2 million consisting of 0.4 million ounces of silver and 11,957 ounces of gold, which had a fair value of approximately $34.1 million including the embedded derivative. For each one cent per ounce change in realized silver price, revenue would vary (plus or minus) approximately $4,000 and for each one dollar per ounce change in realized gold price, revenue would vary (plus or minus) approximately $12,000. At December 31, 2011, the Company had outstanding provisionally priced sales of $22.5 million consisting of 0.2 million ounces of silver and 9,701 ounces of gold, which had a fair value of approximately $21.7 million including the embedded derivative. For each one cent per ounce change in realized silver price, revenue would vary (plus or minus) approximately $2,000 and for each one dollar per ounce change in realized gold price, revenue would vary (plus or minus) approximately $9,700.
Cash and Cash Equivalents	Cash and Cash Equivalents: Cash and cash equivalents include all highly-liquid investments with a maturity of three months or less at the date of purchase. The Company minimizes its credit risk by investing its cash and cash equivalents with major U.S. and international banks and financial institutions located principally in the United States with a minimum credit rating of A1 as defined by Standard & Poor’s. The Company’s management believes that no concentration of credit risk exists with respect to the investment of its cash and cash equivalents.
Receivables	Receivables: Trade receivables and other receivable balances recorded in other current assets are reported at outstanding principal amounts, net of an allowance for doubtful accounts, if deemed necessary. Management evaluates the collectability of receivable account balances to determine the allowance, if any. Management considers the other party's credit risk and financial condition, as well as current and projected economic and market conditions, in determining the amount of the allowance. Receivable balances are written off when management determines that the balance is uncollectable.
Ore on Leach Pad	Ore on Leach Pad: The heap leach process is a process of extracting silver and gold by placing ore on an impermeable pad and applying a diluted cyanide solution that dissolves a portion of the contained silver and gold, which are then recovered in metallurgical processes. The Company uses several integrated steps to scientifically measure the metal content of ore placed on the leach pads. As the ore body is drilled in preparation for the blasting process, samples are taken of the drill residue which are assayed to determine estimated quantities of contained metal. The Company estimates the quantity of ore by utilizing global positioning satellite survey techniques. The Company then processes the ore through crushing facilities where the output is again weighed and sampled for assaying. A metallurgical reconciliation with the data collected from the mining operation is completed with appropriate adjustments made to previous estimates. The crushed ore is then transported to the leach pad for application of the leaching solution. As the leach solution is collected from the leach pads, it is continuously sampled for assaying. The quantity of leach solution is measured by flow meters throughout the leaching and precipitation process. After precipitation, the product is converted to doré, which is the final product produced by the mine. The inventory is stated at lower of cost or market, with cost being determined using a weighted average cost method. The Company reported ore on the leach pads of $44.3 million as of December 31, 2012, and $33.9 million as of December 31, 2011. As of December 31, 2012, $23.0 million is reported as a current asset and $21.3 million is reported as a non-current asset. As of December 31, 2011, $27.3 million is reported as a current asset and $6.7 million is reported as a non-current asset. The distinction between current and non-current is based upon the expected length of time necessary for the leaching process to remove the metals from the broken ore. The historical cost of the metal that is expected to be extracted within twelve months is classified as current and the historical cost of metals contained within the broken ore that is expected to be extracted beyond twelve months is classified as non-current. Inventories of ore on leach pad are valued based on actual production costs incurred to produce and place ore on the leach pad, adjusted for effects on monthly production costs of abnormal production levels, less costs allocated to minerals recovered through the leach process. The estimate of both the ultimate recovery expected over time and the quantity of metal that may be extracted relative to the time the leach process occurs requires the use of estimates which are inherently inaccurate since they rely upon laboratory testwork. Testwork consists of 60 day leach columns from which the Company projects metal recoveries up to five years in the future. The quantities of metal contained in the ore are based upon actual weights and assay analysis. The rate at which the leach process extracts gold and silver from the crushed ore is based upon laboratory column tests and actual experience occurring over more than twenty years of leach pad operations at the Rochester mine. The assumptions used by the Company to measure metal content during each stage of the inventory conversion process includes estimated recovery rates based on laboratory testing and assaying. The Company periodically reviews its estimates compared to actual experience and revises its estimates when appropriate. During the first quarter of 2011, the Company increased its estimated silver ounces contained in the Stage IV heap inventory by 0.7 million and decreased its estimated gold ounces contained in the heap inventory by 298 ounces. During the fourth quarter of 2011, the Company decreased its estimated silver ounces contained in the Stage IV heap inventory by 0.2 million ounces and decreased its estimated gold ounces contained in the Stage IV heap inventory by 10,828 ounces. During the fourth quarter of 2012, the Company increased its estimated silver ounces contained in the Stage IV heap inventory by 0.5 million ounces and increased its estimated gold ounces contained in the Stage IV heap inventory by 8,879 ounces. The increase in estimated silver and gold ounces contained in the stage IV heap inventory is due to a change in the amount of time the Company expects to continue leaching. The ultimate recovery will not be known until leaching operations cease.
Metal and Other Inventory	Metal and Other Inventory: Inventories include concentrate ore, doré, ore in stockpiles and operating materials and supplies. The classification of inventory is determined by the stage at which the ore is in the production process. To the extent there is work in process inventories at the Endeavor mine, such amounts are carried as inventories. Inventories of ore in stock piles are sampled for gold and silver content and are valued based on the lower of costs incurred or estimated net realizable value based upon the period ending prices of gold and silver. Material that does not contain a minimum quantity of gold and silver to cover estimated processing expense to recover the contained gold and silver is not classified as inventory and is assigned no value. All inventories are stated at the lower of cost or market, with cost being determined using a weighted average cost method. Concentrate and doré inventory includes product at the mine site and product held by refineries and are also valued at lower of cost or market value. Concentrate inventories associated with the Endeavor mine are held by third parties. Metal inventory costs include direct labor, materials, depreciation, depletion and amortization as well as administrative overhead costs relating to mining activities.
Property, Plant, and Equipment	Property, Plant, and Equipment: Expenditures for new facilities, assets acquired pursuant to capital leases, new assets or expenditures that extend the useful lives of existing facilities are capitalized and depreciated using the straight-line method at rates sufficient to depreciate such costs over the shorter of estimated productive lives of such facilities or the useful life of the individual assets. Productive lives range from 7 to 31 years for buildings and improvements and 3 to 13 years for machinery and equipment. Certain mining equipment is depreciated using the units-of-production method based upon estimated total proven and probable reserves. Maintenance and repairs are expensed as incurred.
Operational Mining Properties and Mine Development	Operational Mining Properties and Mine Development: Capitalization of mine development costs that meet the definition of an asset begins once all operating permits have been secured, mineralization is classified as proven and probable reserves and a final feasibility study has been completed. Mine development costs include engineering and metallurgical studies, drilling and other related costs to delineate an ore body, the removal of overburden to initially expose an ore body at open pit surface mines and the building of access ways, shafts, lateral access, drifts, ramps and other infrastructure at underground mines. Costs incurred during the start-up phase of a mine are expensed as incurred. Costs incurred before mineralization is classified as proven and probable reserves are expensed and classified as Exploration or Pre-development expense. All capitalized costs are amortized using the units of production method over the estimated life of the ore body based on recoverable ounces to be mined from proven and probable reserves. Interest expense allocable to the cost of developing mining properties and to construct new facilities is capitalized until assets are ready for their intended use. Drilling and related costs incurred at the Company’s operating mines are expensed as incurred as exploration expense, unless the Company can conclude with a high degree of confidence, prior to the commencement of a drilling program, that the drilling costs will result in the conversion of a mineral resource into proven and probable reserves. The Company’s assessment is based on the following factors: results from previous drill programs; results from geological models; results from a mine scoping study confirming economic viability of the resource; and preliminary estimates of mine inventory, ore grade, cash flow and mine life. In addition, the Company must have all permitting and/or contractual requirements necessary to have the right to and/or control of the future benefit from the targeted ore body. The costs of a drilling program that meet these criteria are capitalized as mine development costs. All other drilling and related costs, including those beyond the boundaries of the development and production stage properties, are expensed as incurred. Drilling and related costs of approximately $13.9 million and $7.2 million at December 31, 2012 and 2011, respectively, met the criteria for capitalization listed above at the Company’s properties that are in the development and production stages. The cost of removing overburden and waste materials to access the ore body at an open pit mine prior to the production phase are referred to as “pre-stripping costs.” Pre-stripping costs are capitalized during the development of an open pit mine. Stripping costs incurred during the production phase of a mine are variable production costs that are included as a component of inventory to be recognized in production costs applicable to sales in the same period as the revenue from the sale of inventory.
Mineral Interests	Mineral Interests: Significant payments related to the acquisition of land and mineral rights are capitalized as incurred. Prior to acquiring such land or mineral rights, the Company generally makes a preliminary evaluation to determine that the property has significant potential to develop an economic ore body. The time between initial acquisition and full evaluation of a property’s potential is variable and is determined by many factors including: location relative to existing infrastructure, the property’s stage of development, geological controls and metal prices. If a mineable ore body is discovered, such costs are amortized when production begins using the units-of-production method based on recoverable ounces to be mined from proven and probable reserves. If no mineable ore body is discovered, such costs are expensed in the period in which it is determined the property has no future economic value. The Company amortizes its mineral interests in the Endeavor mine using the units of production method.
Asset Impairment	Asset Impairment: Management reviews and evaluates its long-lived assets for impairment when events and changes in circumstances indicate that the related carrying amounts of its assets may not be recoverable. Impairment is considered to exist if the total probability-weighted estimate or other appropriate estimate of future cash flows on an undiscounted basis are less than the carrying amount of the asset group, including property plant and equipment, mineral property, development property, and any deferred costs. An impairment loss is measured and recorded based on the difference between book value and estimated fair value of the asset group, as determined through the application of present value technique to estimate fair value in the absence of a market price. Future cash flows include estimates of recoverable ounces, gold and silver prices (considering current and historical prices, price trends and related factors), production levels and required capital investment, all based on life-of-mine plans and projections. Assumptions underlying future cash flow estimates are subject to risks and uncertainties. Any differences between these assumptions and actual market conditions or the Company’s actual operating performance could have a material effect on the Company’s determination of its ability to recover the carrying amounts of its long-lived assets resulting in impairment charges. In estimating future cash flows, assets are grouped at the lowest level for which there are identifiable cash flows that are largely independent of cash flows from other asset groups. Generally, in estimating future cash flows, all assets are grouped at a particular mine for which there is identifiable cash flow. Coeur owns, directly or indirectly, 100% of Coeur Argentina S.R.L., which owns and operated the underground silver and gold Martha mine located in Santa Cruz, Argentina. Mining operations commenced at the Martha mine in June 2002 and the mine ceased active mining operation in September 2012. The Company recorded an impairment charge of $5.8 million in the year ended December 31, 2012. As of December 31, 2012, the decrease in proven and probable resources at the Kensington mine prompted an impairment review of the carrying value of the mine. The review determined there were no impairments for the Kensington mine. The impairment assessment compared the cumulative undiscounted prospective cash flows of the mine over the expected mine life to the sum of the carrying value of the long-lived assets at Kensington as of December 31, 2012. Restricted Assets: The Company, under the terms of its self-insurance and bonding agreements with certain banks, lending institutions and regulatory agencies, is required to collateralize certain portions of its obligations. The Company has collateralized these obligations by assigning certificates of deposit that have maturity dates ranging from three months to a year, to the respective institutions or agencies. At December 31, 2012 and 2011, the Company held certificates of deposit and cash under these agreements of $25.0 million and $28.9 million, respectively, restricted for these purposes. The ultimate timing of the release of the collateralized amounts is dependent on the timing and closure of each mine and repayment of the facility. In order to release the collateral, the Company must seek approval from certain government agencies responsible for monitoring the mine closure status. Collateral could also be released to the extent the Company is able to secure alternative financial assurance satisfactory to the regulatory agencies. The Company believes there is a reasonable probability that the collateral will remain in place beyond a twelve-month period and has therefore classified these investments as long-term.
Reclamation and Remediation Costs	Reclamation and Remediation Costs: The Company recognizes obligations for the retirement of tangible long-lived assets and other associated asset retirement costs. These legal obligations are associated with the retirement of long-lived assets that result from the acquisition, construction, development and normal use of the asset. The fair value of a liability for an asset retirement obligation will be recognized in the period in which it is incurred if a reasonable estimate of fair value can be made. The fair value of the liability is added to the carrying amount of the associated asset and this additional carrying amount is depreciated over the life of the asset. An accretion cost, representing the increase over time in the present value of the liability, is recorded each period in depreciation, depletion and amortization expense. As reclamation work is performed or liabilities are otherwise settled, the recorded amount of the liability is reduced. Future remediation costs for inactive mines are accrued based on management’s best estimate at the end of each period of the undiscounted costs expected to be incurred at the site. Such cost estimates include, where applicable, ongoing care and maintenance and monitoring costs. Changes in estimates are reflected in earnings in the period an estimate is revised.
Foreign Currency	Foreign Currency: The assets and liabilities of the Company’s foreign subsidiaries are measured using U.S. dollars as their functional currency. Revenues and expenses are translated at the average exchange rate for the period. Foreign currency transaction gains and losses are included in the determination of net income or loss.
Derivative Financial Instruments	Derivative Financial Instruments: The Company recognizes all derivatives as either assets or liabilities on the balance sheet and measures those instruments at fair value. Changes in the value of derivative instruments are recorded each period in the consolidated statement of operations under the caption "fair value adjustments, net.
Stock-based Compensation Plans	Stock-based Compensation Plans: The Company estimates the fair value of stock options and stock appreciation rights (“SARs”) awards using the Black-Scholes option pricing model. Stock options granted are accounted for as equity-based awards and SARs are accounted for as liability-based awards. The value of the SARs is remeasured at each reporting date. The Company estimates the fair value of performance share and performance unit grants using a Monte Carlo simulation valuation model. Performance shares granted are accounted for as equity based awards and performance shares units are accounted for as liability-based awards. The Company estimates forfeitures of stock-based awards based on historical data and periodically adjusts the forfeiture rate. The adjustment of the forfeiture rate is recorded as a cumulative adjustment in the period the forfeiture estimate is changed. Compensation costs related to stock based compensation are included in administrative and general expenses, production costs applicable to sales and the cost of self-constructed property, plant and equipment as deemed appropriate. Restricted stock and restricted stock units granted under the Company’s incentive plans are accounted for based on the market value of the underlying shares on the date of grant and vest in equal installments annually over three years. Restricted stock awards are accounted for as equity-based awards and restricted stock unit awards are accounted for as liability-based awards. Restricted stock units are remeasured at each reporting date. Restricted stock units are settled in cash based on the number of vested restricted stock units multiplied by the current market price of the common shares when vested. Holders of the restricted stock are entitled to vote the shares and to receive any dividends declared on the shares.
Income Taxes	Income Taxes: The Company uses an asset and liability approach which results in the recognition of deferred tax liabilities and assets for the expected future tax consequences or benefits of temporary differences between the financial reporting basis and the tax basis of assets and liabilities, as well as operating loss and tax credit carryforwards, using enacted tax rates in effect in the years in which the differences are expected to reverse. In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of its deferred tax assets will not be realized. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in making this assessment. A valuation allowance has been provided for the portion of the Company’s net deferred tax assets for which it is more likely than not that they will not be realized. The Company and its subsidiaries are subject to U.S. federal income tax as well as income tax of multiple state and foreign jurisdictions. The Company has substantially concluded all U.S. federal income tax matters for years through 1999. Federal income tax returns for 2000 through 2011 are subject to examination. The Company’s practice is to recognize interest and/or penalties related to income tax matters in income tax expense. The Company has accrued additional expense due to an audit of San Bartolomé's 2009 Bolivian tax return, whereby San Bartolomé incurred an additional $1.4 million of tax expense, including interest and penalties, related to the 2009 tax year and recognized a further $15.5 million of tax expense, including interest and penalties, related to uncertainty in similar tax positions for the years 2010, 2011 and 2012.
Debt Issuance Costs	Debt Issuance Costs: Costs associated with the issuance of debt are included in other noncurrent assets and are amortized over the term of the related debt using the effective interest method.
Use of Estimates	Use of Estimates: The preparation of the Company’s consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in their consolidated financial statements and accompanying notes. The areas requiring the use of management’s estimates and assumptions relate to recoverable ounces from proven and probable reserves that are the basis of future cash flow estimates and units-of-production depreciation and amortization calculations; useful lives utilized for depreciation, depletion and amortization; estimates of future cash flows for long lived assets; estimates of recoverable gold and silver ounces in ore on leach pads; the amount and timing of reclamation and remediation costs; valuation allowance for deferred tax assets; and other employee benefit liabilities.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2012

Principles of Consolidation: The consolidated financial statements include the wholly-owned subsidiaries of the Company, the most significant of which are Empresa Minera Manquiri S.A., Coeur Mexicana S.A. de C.V., Coeur Rochester, Inc., Coeur Alaska, Inc., Coeur Argentina S.R.L. and CDE Australia Pty. Ltd. The consolidated financial statements also include all entities in which voting control of more than 50% is held by the Company. The Company has no investments in entities in which it has greater than 50% ownership interest accounted for using the equity method. Intercompany balances and transactions have been eliminated in consolidation. Investments in corporate joint ventures where the Company has ownership of 50% or less and funds its proportionate share of expenses are accounted for under the equity method. The Company has no investments in entities in which it has a greater than 20% ownership interest accounted for using the cost method.

Revenue Recognition

Revenue Recognition: Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred, the price is fixed or determinable, no obligations remain and collection is probable. The passing of title to the customer is based on the terms of the sales contract. Product pricing is determined at the point revenue is recognized by reference to active and freely traded commodity markets, for example the London Bullion Market for both gold and silver, in an identical form to the product sold.

Under the Company’s concentrate sales contracts with third-party smelters, final gold and silver prices are set on a specified future quotational period, typically one to three months, after the shipment date based on market metal prices. Revenues and production costs applicable to sales are recorded on a gross basis under these contracts at the time title passes to the buyer based on the forward price for the expected settlement period. The contracts, in general, provide for provisional payment based upon provisional assays and quoted metal prices. Final settlement is based on the average applicable price for the specified future quotational period and generally occurs from three to six months after shipment. Final sales are settled using smelter weights and settlement assays (average of assays exchanged and/or umpire assay results) and are priced as specified in the smelter contract. The Company’s provisionally priced sales contain an embedded derivative that is required to be separated from the host contract for accounting purposes. The host contract is the receivable from the sale of concentrates measured at the forward price at the time of sale. The embedded derivative does not qualify for hedge accounting. The embedded derivative is recorded as a derivative asset in prepaid expenses and other assets or as a derivative liability in accrued liabilities and other on the consolidated balance sheet and is adjusted to fair value through revenue each period until the date of final gold and silver settlement. The form of the material being sold, after deduction for smelting and refining, is in an identical form to that sold on the London Bullion Market. The form of the product is metal in flotation concentrate, which is the final process for which the Company is responsible. Revenue includes the sales of by-product gold from the Company’s silver mining operations.

The effects of forward sales contracts are reflected in revenue at the date the related precious metals are delivered or the contracts expire. Third-party smelting and refining costs of $16.6 million, $17.7 million and $8.6 million in 2012, 2011 and 2010, respectively, are recorded as a reduction of revenue.

At December 31, 2012, the Company had outstanding provisionally priced sales of $33.2 million consisting of 0.4 million ounces of silver and 11,957 ounces of gold, which had a fair value of approximately $34.1 million including the embedded derivative. For each one cent per ounce change in realized silver price, revenue would vary (plus or minus) approximately $4,000 and for each one dollar per ounce change in realized gold price, revenue would vary (plus or minus) approximately $12,000. At December 31, 2011, the Company had outstanding provisionally priced sales of $22.5 million consisting of 0.2 million ounces of silver and 9,701 ounces of gold, which had a fair value of approximately $21.7 million including the embedded derivative. For each one cent per ounce change in realized silver price, revenue would vary (plus or minus) approximately $2,000 and for each one dollar per ounce change in realized gold price, revenue would vary (plus or minus) approximately $9,700.

Cash and Cash Equivalents

Cash and Cash Equivalents: Cash and cash equivalents include all highly-liquid investments with a maturity of three months or less at the date of purchase. The Company minimizes its credit risk by investing its cash and cash equivalents with major U.S. and international banks and financial institutions located principally in the United States with a minimum credit rating of A1 as defined by Standard & Poor’s. The Company’s management believes that no concentration of credit risk exists with respect to the investment of its cash and cash equivalents.

Receivables

Receivables: Trade receivables and other receivable balances recorded in other current assets are reported at outstanding principal amounts, net of an allowance for doubtful accounts, if deemed necessary. Management evaluates the collectability of receivable account balances to determine the allowance, if any. Management considers the other party's credit risk and financial condition, as well as current and projected economic and market conditions, in determining the amount of the allowance. Receivable balances are written off when management determines that the balance is uncollectable.

Ore on Leach Pad

Ore on Leach Pad: The heap leach process is a process of extracting silver and gold by placing ore on an impermeable pad and applying a diluted cyanide solution that dissolves a portion of the contained silver and gold, which are then recovered in metallurgical processes.

The Company uses several integrated steps to scientifically measure the metal content of ore placed on the leach pads. As the ore body is drilled in preparation for the blasting process, samples are taken of the drill residue which are assayed to determine estimated quantities of contained metal. The Company estimates the quantity of ore by utilizing global positioning satellite survey techniques. The Company then processes the ore through crushing facilities where the output is again weighed and sampled for assaying. A metallurgical reconciliation with the data collected from the mining operation is completed with appropriate adjustments made to previous estimates. The crushed ore is then transported to the leach pad for application of the leaching solution. As the leach solution is collected from the leach pads, it is continuously sampled for assaying. The quantity of leach solution is measured by flow meters throughout the leaching and precipitation process. After precipitation, the product is converted to doré, which is the final product produced by the mine. The inventory is stated at lower of cost or market, with cost being determined using a weighted average cost method.

The Company reported ore on the leach pads of $44.3 million as of December 31, 2012, and $33.9 million as of December 31, 2011. As of December 31, 2012, $23.0 million is reported as a current asset and $21.3 million is reported as a non-current asset. As of December 31, 2011, $27.3 million is reported as a current asset and $6.7 million is reported as a non-current asset. The distinction between current and non-current is based upon the expected length of time necessary for the leaching process to remove the metals from the broken ore. The historical cost of the metal that is expected to be extracted within twelve months is classified as current and the historical cost of metals contained within the broken ore that is expected to be extracted beyond twelve months is classified as non-current. Inventories of ore on leach pad are valued based on actual production costs incurred to produce and place ore on the leach pad, adjusted for effects on monthly production costs of abnormal production levels, less costs allocated to minerals recovered through the leach process.

The estimate of both the ultimate recovery expected over time and the quantity of metal that may be extracted relative to the time the leach process occurs requires the use of estimates which are inherently inaccurate since they rely upon laboratory testwork. Testwork consists of 60 day leach columns from which the Company projects metal recoveries up to five years in the future. The quantities of metal contained in the ore are based upon actual weights and assay analysis. The rate at which the leach process extracts gold and silver from the crushed ore is based upon laboratory column tests and actual experience occurring over more than twenty years of leach pad operations at the Rochester mine. The assumptions used by the Company to measure metal content during each stage of the inventory conversion process includes estimated recovery rates based on laboratory testing and assaying. The Company periodically reviews its estimates compared to actual experience and revises its estimates when appropriate. During the first quarter of 2011, the Company increased its estimated silver ounces contained in the Stage IV heap inventory by 0.7 million and decreased its estimated gold ounces contained in the heap inventory by 298 ounces. During the fourth quarter of 2011, the Company decreased its estimated silver ounces contained in the Stage IV heap inventory by 0.2 million ounces and decreased its estimated gold ounces contained in the Stage IV heap inventory by 10,828 ounces. During the fourth quarter of 2012, the Company increased its estimated silver ounces contained in the Stage IV heap inventory by 0.5 million ounces and increased its estimated gold ounces contained in the Stage IV heap inventory by 8,879 ounces.

The increase in estimated silver and gold ounces contained in the stage IV heap inventory is due to a change in the amount of time the Company expects to continue leaching. The ultimate recovery will not be known until leaching operations cease.

Metal and Other Inventory

Metal and Other Inventory: Inventories include concentrate ore, doré, ore in stockpiles and operating materials and supplies. The classification of inventory is determined by the stage at which the ore is in the production process. To the extent there is work in process inventories at the Endeavor mine, such amounts are carried as inventories. Inventories of ore in stock piles are sampled for gold and silver content and are valued based on the lower of costs incurred or estimated net realizable value based upon the period ending prices of gold and silver. Material that does not contain a minimum quantity of gold and silver to cover estimated processing expense to recover the contained gold and silver is not classified as inventory and is assigned no value. All inventories are stated at the lower of cost or market, with cost being determined using a weighted average cost method. Concentrate and doré inventory includes product at the mine site and product held by refineries and are also valued at lower of cost or market value. Concentrate inventories associated with the Endeavor mine are held by third parties. Metal inventory costs include direct labor, materials, depreciation, depletion and amortization as well as administrative overhead costs relating to mining activities.

Property, Plant, and Equipment

Property, Plant, and Equipment: Expenditures for new facilities, assets acquired pursuant to capital leases, new assets or expenditures that extend the useful lives of existing facilities are capitalized and depreciated using the straight-line method at rates sufficient to depreciate such costs over the shorter of estimated productive lives of such facilities or the useful life of the individual assets. Productive lives range from 7 to 31 years for buildings and improvements and 3 to 13 years for machinery and equipment. Certain mining equipment is depreciated using the units-of-production method based upon estimated total proven and probable reserves. Maintenance and repairs are expensed as incurred.

Operational Mining Properties and Mine Development

Operational Mining Properties and Mine Development: Capitalization of mine development costs that meet the definition of an asset begins once all operating permits have been secured, mineralization is classified as proven and probable reserves and a final feasibility study has been completed. Mine development costs include engineering and metallurgical studies, drilling and other related costs to delineate an ore body, the removal of overburden to initially expose an ore body at open pit surface mines and the building of access ways, shafts, lateral access, drifts, ramps and other infrastructure at underground mines. Costs incurred during the start-up phase of a mine are expensed as incurred. Costs incurred before mineralization is classified as proven and probable reserves are expensed and classified as Exploration or Pre-development expense. All capitalized costs are amortized using the units of production method over the estimated life of the ore body based on recoverable ounces to be mined from proven and probable reserves. Interest expense allocable to the cost of developing mining properties and to construct new facilities is capitalized until assets are ready for their intended use.

Drilling and related costs incurred at the Company’s operating mines are expensed as incurred as exploration expense, unless the Company can conclude with a high degree of confidence, prior to the commencement of a drilling program, that the drilling costs will result in the conversion of a mineral resource into proven and probable reserves. The Company’s assessment is based on the following factors: results from previous drill programs; results from geological models; results from a mine scoping study confirming economic viability of the resource; and preliminary estimates of mine inventory, ore grade, cash flow and mine life. In addition, the Company must have all permitting and/or contractual requirements necessary to have the right to and/or control of the future benefit from the targeted ore body. The costs of a drilling program that meet these criteria are capitalized as mine development costs. All other drilling and related costs, including those beyond the boundaries of the development and production stage properties, are expensed as incurred.

Drilling and related costs of approximately $13.9 million and $7.2 million at December 31, 2012 and 2011, respectively, met the criteria for capitalization listed above at the Company’s properties that are in the development and production stages.

The cost of removing overburden and waste materials to access the ore body at an open pit mine prior to the production phase are referred to as “pre-stripping costs.” Pre-stripping costs are capitalized during the development of an open pit mine. Stripping costs incurred during the production phase of a mine are variable production costs that are included as a component of inventory to be recognized in production costs applicable to sales in the same period as the revenue from the sale of inventory.

Mineral Interests

Mineral Interests: Significant payments related to the acquisition of land and mineral rights are capitalized as incurred. Prior to acquiring such land or mineral rights, the Company generally makes a preliminary evaluation to determine that the property has significant potential to develop an economic ore body. The time between initial acquisition and full evaluation of a property’s potential is variable and is determined by many factors including: location relative to existing infrastructure, the property’s stage of development, geological controls and metal prices. If a mineable ore body is discovered, such costs are amortized when production begins using the units-of-production method based on recoverable ounces to be mined from proven and probable reserves. If no mineable ore body is discovered, such costs are expensed in the period in which it is determined the property has no future economic value. The Company amortizes its mineral interests in the Endeavor mine using the units of production method.

Asset Impairment

Asset Impairment: Management reviews and evaluates its long-lived assets for impairment when events and changes in circumstances indicate that the related carrying amounts of its assets may not be recoverable. Impairment is considered to exist if the total probability-weighted estimate or other appropriate estimate of future cash flows on an undiscounted basis are less than the carrying amount of the asset group, including property plant and equipment, mineral property, development property, and any deferred costs. An impairment loss is measured and recorded based on the difference between book value and estimated fair value of the asset group, as determined through the application of present value technique to estimate fair value in the absence of a market price. Future cash flows include estimates of recoverable ounces, gold and silver prices (considering current and historical prices, price trends and related factors), production levels and required capital investment, all based on life-of-mine plans and projections. Assumptions underlying future cash flow estimates are subject to risks and uncertainties. Any differences between these assumptions and actual market conditions or the Company’s actual operating performance could have a material effect on the Company’s determination of its ability to recover the carrying amounts of its long-lived assets resulting in impairment charges. In estimating future cash flows, assets are grouped at the lowest level for which there are identifiable cash flows that are largely independent of cash flows from other asset groups. Generally, in estimating future cash flows, all assets are grouped at a particular mine for which there is identifiable cash flow.

Coeur owns, directly or indirectly, 100% of Coeur Argentina S.R.L., which owns and operated the underground silver and gold Martha mine located in Santa Cruz, Argentina. Mining operations commenced at the Martha mine in June 2002 and the mine ceased active mining operation in September 2012. The Company recorded an impairment charge of $5.8 million in the year ended December 31, 2012.

As of December 31, 2012, the decrease in proven and probable resources at the Kensington mine prompted an impairment review of the carrying value of the mine. The review determined there were no impairments for the Kensington mine. The impairment assessment compared the cumulative undiscounted prospective cash flows of the mine over the expected mine life to the sum of the carrying value of the long-lived assets at Kensington as of December 31, 2012.

Restricted Assets: The Company, under the terms of its self-insurance and bonding agreements with certain banks, lending institutions and regulatory agencies, is required to collateralize certain portions of its obligations. The Company has collateralized these obligations by assigning certificates of deposit that have maturity dates ranging from three months to a year, to the respective institutions or agencies. At December 31, 2012 and 2011, the Company held certificates of deposit and cash under these agreements of $25.0 million and $28.9 million, respectively, restricted for these purposes. The ultimate timing of the release of the collateralized amounts is dependent on the timing and closure of each mine and repayment of the facility. In order to release the collateral, the Company must seek approval from certain government agencies responsible for monitoring the mine closure status. Collateral could also be released to the extent the Company is able to secure alternative financial assurance satisfactory to the regulatory agencies. The Company believes there is a reasonable probability that the collateral will remain in place beyond a twelve-month period and has therefore classified these investments as long-term.

Reclamation and Remediation Costs

Reclamation and Remediation Costs: The Company recognizes obligations for the retirement of tangible long-lived assets and other associated asset retirement costs. These legal obligations are associated with the retirement of long-lived assets that result from the acquisition, construction, development and normal use of the asset. The fair value of a liability for an asset retirement obligation will be recognized in the period in which it is incurred if a reasonable estimate of fair value can be made. The fair value of the liability is added to the carrying amount of the associated asset and this additional carrying amount is depreciated over the life of the asset. An accretion cost, representing the increase over time in the present value of the liability, is recorded each period in depreciation, depletion and amortization expense. As reclamation work is performed or liabilities are otherwise settled, the recorded amount of the liability is reduced.

Future remediation costs for inactive mines are accrued based on management’s best estimate at the end of each period of the undiscounted costs expected to be incurred at the site. Such cost estimates include, where applicable, ongoing care and maintenance and monitoring costs. Changes in estimates are reflected in earnings in the period an estimate is revised.

Foreign Currency

Foreign Currency: The assets and liabilities of the Company’s foreign subsidiaries are measured using U.S. dollars as their functional currency. Revenues and expenses are translated at the average exchange rate for the period. Foreign currency transaction gains and losses are included in the determination of net income or loss.

Derivative Financial Instruments

Derivative Financial Instruments: The Company recognizes all derivatives as either assets or liabilities on the balance sheet and measures those instruments at fair value. Changes in the value of derivative instruments are recorded each period in the consolidated statement of operations under the caption "fair value adjustments, net.

Stock-based Compensation Plans

Stock-based Compensation Plans: The Company estimates the fair value of stock options and stock appreciation rights (“SARs”) awards using the Black-Scholes option pricing model. Stock options granted are accounted for as equity-based awards and SARs are accounted for as liability-based awards. The value of the SARs is remeasured at each reporting date. The Company estimates the fair value of performance share and performance unit grants using a Monte Carlo simulation valuation model. Performance shares granted are accounted for as equity based awards and performance shares units are accounted for as liability-based awards. The Company estimates forfeitures of stock-based awards based on historical data and periodically adjusts the forfeiture rate. The adjustment of the forfeiture rate is recorded as a cumulative adjustment in the period the forfeiture estimate is changed. Compensation costs related to stock based compensation are included in administrative and general expenses, production costs applicable to sales and the cost of self-constructed property, plant and equipment as deemed appropriate.

Restricted stock and restricted stock units granted under the Company’s incentive plans are accounted for based on the market value of the underlying shares on the date of grant and vest in equal installments annually over three years. Restricted stock awards are accounted for as equity-based awards and restricted stock unit awards are accounted for as liability-based awards. Restricted stock units are remeasured at each reporting date. Restricted stock units are settled in cash based on the number of vested restricted stock units multiplied by the current market price of the common shares when vested. Holders of the restricted stock are entitled to vote the shares and to receive any dividends declared on the shares.

Income Taxes

Income Taxes: The Company uses an asset and liability approach which results in the recognition of deferred tax liabilities and assets for the expected future tax consequences or benefits of temporary differences between the financial reporting basis and the tax basis of assets and liabilities, as well as operating loss and tax credit carryforwards, using enacted tax rates in effect in the years in which the differences are expected to reverse.

In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of its deferred tax assets will not be realized. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in making this assessment. A valuation allowance has been provided for the portion of the Company’s net deferred tax assets for which it is more likely than not that they will not be realized.

The Company and its subsidiaries are subject to U.S. federal income tax as well as income tax of multiple state and foreign jurisdictions. The Company has substantially concluded all U.S. federal income tax matters for years through 1999. Federal income tax returns for 2000 through 2011 are subject to examination. The Company’s practice is to recognize interest and/or penalties related to income tax matters in income tax expense. The Company has accrued additional expense due to an audit of San Bartolomé's 2009 Bolivian tax return, whereby San Bartolomé incurred an additional $1.4 million of tax expense, including interest and penalties, related to the 2009 tax year and recognized a further $15.5 million of tax expense, including interest and penalties, related to uncertainty in similar tax positions for the years 2010, 2011 and 2012.

Debt Issuance Costs

Debt Issuance Costs: Costs associated with the issuance of debt are included in other noncurrent assets and are amortized over the term of the related debt using the effective interest method.

Use of Estimates

Use of Estimates: The preparation of the Company’s consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in their consolidated financial statements and accompanying notes. The areas requiring the use of management’s estimates and assumptions relate to recoverable ounces from proven and probable reserves that are the basis of future cash flow estimates and units-of-production depreciation and amortization calculations; useful lives utilized for depreciation, depletion and amortization; estimates of future cash flows for long lived assets; estimates of recoverable gold and silver ounces in ore on leach pads; the amount and timing of reclamation and remediation costs; valuation allowance for deferred tax assets; and other employee benefit liabilities.