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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Common Stock | Accumulated Other Comprehensive (Loss) Income | Accumulated Deficit | Total
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Balance at Dec. 31, 2011 | $ 613,831 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (1,289)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (393,238)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 219,304 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2011 | 139,753 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |
Stock-based compensation | 3,405 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 3,405 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Issuance of exchangeable shares to acquire Minera Andes Inc. | 664,671 mux_ExchangeableStockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 664,671 mux_ExchangeableStockIssuedDuringPeriodValueAcquisitions
Issuance of exchangeable shares to acquire Minera Andes Inc. (in shares) | 127,331 mux_ExchangeableStockIssuedDuringPeriodSharesAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Assumption of stock options in connection with the acquisition of Minera Andes Inc. | 3,175 mux_StockIssuedDuringPeriodValueStockOptionsAssumedInAcquisitionOfBusiness / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 3,175 mux_StockIssuedDuringPeriodValueStockOptionsAssumedInAcquisitionOfBusiness
Sale of shares for cash, net of issuance costs | 43,047 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 43,047 us-gaap_StockIssuedDuringPeriodValueNewIssues
Sale of shares for cash, net of issuance costs (in shares) | 19,552 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Sale of exchangeable shares for cash, net of issuance costs | 17,372 mux_ExchangeableStockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 17,372 mux_ExchangeableStockIssuedDuringPeriodValueNewIssues
Sale of exchangeable shares for cash, net of issuance costs (in shares) | 7,799 mux_ExchangeableStockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Exercise of stock options | 819 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 819 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Exercise of stock options (in shares) | 445 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 445,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Exercise of stock options assumed from Minera Andes Inc. acquisition | 3,066 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 3,066 us-gaap_StockIssuedDuringPeriodValueAcquisitions
Exercise of stock options assumed from Minera Andes Inc. acquisition (in shares) | 1,062 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Shares issued for Mexico mining concessions | 391 us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 391 us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets
Shares issued for Mexico mining concessions (in shares) | 83 us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Unrealized loss on marketable securities |  | (5)us-gaap_MarketableSecuritiesUnrealizedGainLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | (5)us-gaap_MarketableSecuritiesUnrealizedGainLoss
Unrealized gain on available-for-sale securities, net of taxes |  |  |  | (5)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Reclassification of unrealized loss on marketable equity securities disposed of during the period, net of tax |  | (993)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | (993)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Other-than-temporary impairment on marketable equity securities |  | 1,993 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 1,993 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax
Net loss |  |  | (66,654)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (66,654)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Balance at Dec. 31, 2012 | 1,349,777 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (294)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (459,892)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 889,591 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2012 | 296,025 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |
Stock-based compensation | 1,382 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 1,382 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Exercise of stock options | 95 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 95 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Exercise of stock options (in shares) | 48 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 48,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Exercise of stock options assumed from Minera Andes Inc. acquisition | 76 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 76 us-gaap_StockIssuedDuringPeriodValueAcquisitions
Exercise of stock options assumed from Minera Andes Inc. acquisition (in shares) | 45 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Shares issued for litigation settlement | 3,270 mux_StockIssuedDuringPeriodValueIssuedForLitigationSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 3,270 mux_StockIssuedDuringPeriodValueIssuedForLitigationSettlement
Shares issued for litigation settlement (in shares) | 1,000 mux_StockIssuedDuringPeriodSharesIssuedForLitigationSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Shares issued for Mexico mining concessions | 96 us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 96 us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets
Shares issued for Mexico mining concessions (in shares) | 41 us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Unrealized gain on available-for-sale securities, net of taxes |  | (1)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | (1)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Net loss |  |  | (147,742)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (147,742)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Balance at Dec. 31, 2013 | 1,354,696 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (295)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (607,634)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 746,767 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2013 | 297,159 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |
Stock-based compensation | 1,324 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 1,324 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Exercise of stock options | 1,932 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 1,932 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Exercise of stock options (in shares) | 1,499 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 1,499,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Exercise of stock options assumed from Minera Andes Inc. acquisition | 360 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 360 us-gaap_StockIssuedDuringPeriodValueAcquisitions
Exercise of stock options assumed from Minera Andes Inc. acquisition (in shares) | 198 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Shares issued for settlement of accounts payable | 1,004 us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 1,004 us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
Shares issued for accounts paybable (in shares) | 394,000 mux_IssuanceOfStockAndWarrantsForServicesOrClaimsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Shares issued to terminate TNR Gold Corp's back-in right | 1,352 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 1,352 us-gaap_StockIssuedDuringPeriodValueOther
Shares issued to terminate TNR Gold Corp's back-in right (in shares) | 850 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Unrealized gain on available-for-sale securities, net of taxes |  | 419 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 419 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Net loss |  |  | (311,943)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (311,943)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Balance at Dec. 31, 2014 | $ 1,360,668 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 124 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (919,577)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 441,215 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2014 | 300,100 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |

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