CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Cash paid to suppliers and employees	$ (68,993)us-gaap_PaymentsToSuppliersAndEmployees	$ (90,365)us-gaap_PaymentsToSuppliersAndEmployees	$ (87,061)us-gaap_PaymentsToSuppliersAndEmployees
Cash received from gold and silver sales	43,812us-gaap_ProceedsFromCustomers	44,416us-gaap_ProceedsFromCustomers	5,557us-gaap_ProceedsFromCustomers
Dividends received from Minera Santa Cruz S.A.	9,483us-gaap_ProceedsFromDividendsReceived	1,826us-gaap_ProceedsFromDividendsReceived	9,770us-gaap_ProceedsFromDividendsReceived
Proceeds from sale of gold and silver bullion held as investments		1,467	23,836
Lease incentive	328us-gaap_IncreaseDecreaseInPrepaidRent
Interest received	464us-gaap_ProceedsFromInterestReceived	262us-gaap_ProceedsFromInterestReceived	228us-gaap_ProceedsFromInterestReceived
Cash used in operating activities	(14,906)	(42,394)	(47,670)
Cash flows from investing activities:
Cash and short-term investments received from acquisition of Minera Andes Inc.			36,337us-gaap_CashAcquiredFromAcquisition
Short-term investments (net)			3,933
Acquisition of mineral property interests		(150)us-gaap_PaymentsToAcquireMiningAssets	(712)us-gaap_PaymentsToAcquireMiningAssets
Additions to property and equipment	(2,788)	(4,306)	(1,879)
Investment in marketable equity securities	(446)
Proceeds from sale of marketable securities			409
Decrease to restricted time deposits for reclamation bonding	5,183		6
Deposit for surety bonds for reclamation bonding	481mux_DepositForSuretyBonds
Proceeds from disposal of mineral property interests and property and equipment	38	1,455	3,143
Cash provided by (used in) investing activities	1,506	(3,001)	41,237
Cash flows from financing activities:
Sale of common stock for cash, net of issuance costs			60,419
Exercise of stock options	2,292	171	3,885
Cash provided by financing activities	2,292	171	64,304
Effect of exchange rate change on cash and cash equivalents	(833)	(1,376)	(366)
(Decrease) increase in cash and cash equivalents	(11,941)	(46,600)	57,505
Cash and cash equivalents, beginning of period	24,321	70,921	13,416
Cash and cash equivalents, end of period	12,380	24,321	70,921
Reconciliation of net loss to cash used in operating activities:
Net loss	(311,943)	(147,742)	(66,654)
Adjustments to reconcile net loss from operating activities:
Loss (income) from investment in Minera Santa Cruz S.A., net of amortization (note 7)	5,284	(846)	(20,835)
Impairment of investment in Minera Santa Cruz S.A. (note 7)	21,162	95,878
Impairment of mineral property interests and property and equipment	353,736us-gaap_AssetImpairmentCharges	62,963us-gaap_AssetImpairmentCharges	18,468us-gaap_AssetImpairmentCharges
Other-than-temporary impairment on marketable equity securities			1,993
(Gain) loss on sale of assets	(26)	6,743	(1,110)
Loss on sale of marketable securities			70
Lease incentive	328us-gaap_IncreaseDecreaseInPrepaidRent
Income tax recovery	(107,170)us-gaap_DeferredIncomeTaxExpenseBenefit	(53,365)us-gaap_DeferredIncomeTaxExpenseBenefit	(27,244)us-gaap_DeferredIncomeTaxExpenseBenefit
Gain on litigation settlement		(560)mux_GainOnLitigationSettlement	3,830mux_GainOnLitigationSettlement
Loss (gain) on sale of gold and silver bullion held as investments		223us-gaap_GainLossOnSaleOfInvestments	(3,075)us-gaap_GainLossOnSaleOfInvestments
Unrealized loss on gold and silver bullion held as investments			359us-gaap_UnrealizedGainLossOnInvestments
Proceeds from sale of gold and silver bullion held as investments		1,467	23,836
Stock-based compensation	1,324us-gaap_StockOptionPlanExpense	1,382us-gaap_StockOptionPlanExpense	3,405us-gaap_StockOptionPlanExpense
Shares issued to supplier for mining services	1,004
Shares issued to TNR Gold Corp's to terminate back-in-right	1,352
Depreciation	979	942	1,033
Accretion of asset retirement obligation	407	461	447
Amortization of mineral property interests and asset retirement obligations	1,236	1,530
Foreign exchange loss	833	1,376	366
Change in non-cash working capital items:
Increase in VAT taxes receivable, net of collection of $5,049 (2013 - $3,438; 2012 - $720)	(148)	(2,441)	(6,167)
(Increase) in other assets related to operations	(3,638)	(703)	3,992
Increase (decrease) in liabilities related to operations	10,891	(11,528)	10,253
Dividend receivable from Minera Santa Cruz S.A	9,483	1,826	9,363
Cash used in operating activities	$ (14,906)	$ (42,394)	$ (47,670)

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities.

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The cash outflow from the purchase of mining and mining related assets during the period.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Cash payments to suppliers for goods and services provided and to employees for services provided.

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Cash receipts from customers during the current period which are usually for sales of goods and services.

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Dividends received on equity and other investments during the current period.

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Interest received on loans and other debt instruments during the current period.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow associated with the sale of equity securities classified as available-for-sale securities.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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-Section 45

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Value of shares of stock issued during the period that is attributable to transactions involving issuance of stock not separately disclosed.

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No definition available.

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

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