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BUSINESS ACQUISITION (Details 2) (USD $) | 12 Months Ended | 3 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2013 | Jan. 24, 2012 | Dec. 31, 2011
BUSINESS ACQUISITION |  |  |  |  |  |
Market price of common stock (in dollars per share) |  |  |  |  | $ 5.22 us-gaap_BusinessAcquisitionSharePrice |
Purchase price: |  |  |  |  |  |
Exchangeable shares of McEwen Mining-Minera Andes Acquisition Corp. |  |  | $ 664,671,000 mux_ExchangeableStockIssuedDuringPeriodValueAcquisitions |  |  |
Stock options to be exchanged for options of McEwen Mining Inc. |  |  | 3,175,000 mux_StockIssuedDuringPeriodValueStockOptionsAssumedInAcquisitionOfBusiness |  |  |
Net assets acquired: |  |  |  |  |  |
Impairment charges | 353,736,000 us-gaap_AssetImpairmentCharges | 62,963,000 us-gaap_AssetImpairmentCharges | 18,468,000 us-gaap_AssetImpairmentCharges |  |  |
Mineral property interests | 287,812,000 us-gaap_MineralPropertiesNet | 642,968,000 us-gaap_MineralPropertiesNet | 767,067,000 us-gaap_MineralPropertiesNet |  |  |
MSC |  |  |  |  |  |
Net assets acquired: |  |  |  |  |  |
Impairment charges | 21,200,000 us-gaap_AssetImpairmentCharges / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember |  |  |  |  |
Exploration properties in Santa Cruz, Argentina |  |  |  |  |  |
Net assets acquired: |  |  |  |  |  |
Impairment charges |  |  |  | 27,700,000 us-gaap_AssetImpairmentCharges / mux_MineralPropertyNameAxis = mux_ExplorationPropertiesLocatedInSantaCruzProvinceArgentinaMember |  |
Exploration properties in Santa Cruz, Argentina | Vend-in agreement | MSC |  |  |  |  |  |
Net assets acquired: |  |  |  |  |  |
Mineral property interests |  | 35,900,000 us-gaap_MineralPropertiesNet / mux_MineralPropertyNameAxis = mux_ExplorationPropertiesLocatedInSantaCruzProvinceArgentinaMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember / us-gaap_TypeOfArrangementAxis = mux_VendInAgreementMember |  |  |  |
Minera Andes |  |  |  |  |  |
BUSINESS ACQUISITION |  |  |  |  |  |
Total transaction costs |  |  | 5,400,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |  |  |
Purchase price: |  |  |  |  |  |
Exchangeable shares of McEwen Mining-Minera Andes Acquisition Corp. |  |  |  |  | 664,671,000 mux_ExchangeableStockIssuedDuringPeriodValueAcquisitions / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Stock options to be exchanged for options of McEwen Mining Inc. |  |  |  |  | 3,175,000 mux_StockIssuedDuringPeriodValueStockOptionsAssumedInAcquisitionOfBusiness / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Purchase price |  |  |  |  | 667,846,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Net assets acquired: |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 31,385,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Short-term investments |  |  |  |  | 4,952,000 mux_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsShortTermInvestments / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Other current assets |  |  |  |  | 9,828,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Inventories |  |  |  |  | 1,362,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Mineral property interests |  |  |  |  | 539,092,000 mux_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedMineralRights / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Investment in Minera Santa Cruz S.A. |  |  |  |  | 262,883,000 mux_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInvestments / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Equipment |  |  |  |  | 1,647,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Accounts payable |  |  |  |  | (5,323,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Deferred income tax liability |  |  |  |  | (177,980,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Purchase price |  |  |  |  | 667,846,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Excess of fair value over carrying value of the underlying assets for tax purposes |  |  |  |  | 508,500,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Deferred income tax liability related to fluctuations in the foreign exchange rates |  |  |  |  | 178,000,000 us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Minera Andes | General and administrative expenses |  |  |  |  |  |
BUSINESS ACQUISITION |  |  |  |  |  |
Total transaction costs |  |  |  |  |  | 3,900,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember
Minera Andes | Acquisition cost |  |  |  |  |  |
BUSINESS ACQUISITION |  |  |  |  |  |
Total transaction costs |  |  | $ 1,500,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember / us-gaap_IncomeStatementLocationAxis = mux_AcquisitionCostMember |  |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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