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Inflation rate assumption used in valuing an instrument.

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Represents the amount of amortization expense related to the mineral property interests.

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Represents the amount of amortization expense related to the mineral property interests and capitalized asset retirement costs.

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Represents the carrying value of the mineral property interest before impairment charge.

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Represents the amount of cumulative project related expenditures required to be incurred before a specified period to earn interest in property per the terms of the joint venture option agreement.

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Amount of difference between fair value and current value of the property underlying the joint venture option agreement.

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Represents the number of properties of the entity which are subject to reclamation obligations.

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The value of the outstanding surety bonds.

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Current portion of reclamation reserve to restore a mining or drilling site to the condition agreed upon within the mining or drilling contract.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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Amount of deferred tax liability attributable to taxable temporary differences from investments (excludes investments in subsidiaries and equity method investments).

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Exploration expenses (including prospecting) related to the mining industry would be included in operating expenses. Exploration costs include costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of mineral reserves.

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Mineral properties, net of adjustments.

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MINERAL PROPERTY INTERSTS AND ASSET RETIREMENT OBLIGATIONS (Details) (USD $)	12 Months Ended			3 Months Ended					1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2014	Jun. 30, 2014	Sep. 30, 2013	Nov. 30, 2012	Sep. 30, 2014
Mineral Property Interests
Cash bonding for mineral properties in the United States	$ 4,800,000mux_OutstandingSuretyBonds	$ 0mux_OutstandingSuretyBonds		0mux_OutstandingSuretyBonds		$ 4,800,000mux_OutstandingSuretyBonds				$ 4,800,000mux_OutstandingSuretyBonds
Amortization of mineral property interests and asset retirement obligations	1,236,000	1,530,000
Mineral property interests	287,812,000us-gaap_MineralPropertiesNet	642,968,000us-gaap_MineralPropertiesNet	767,067,000us-gaap_MineralPropertiesNet	642,968,000us-gaap_MineralPropertiesNet		287,812,000us-gaap_MineralPropertiesNet
(Gain) loss on sale of assets	(26,000)	6,743,000	(1,110,000)
Impairment charges	353,736,000us-gaap_AssetImpairmentCharges	62,963,000us-gaap_AssetImpairmentCharges	18,468,000us-gaap_AssetImpairmentCharges
Deferred tax liability related to mineral properties transferred	(214,000)					(214,000)
Exploration costs	(11,332,000)us-gaap_ExplorationExpenseMining	(24,829,000)us-gaap_ExplorationExpenseMining	(47,179,000)us-gaap_ExplorationExpenseMining
Percentage of annual fees on surety bonds	1.50%mux_SuretyBondsAnnualFeesPercentage
Percentage of upfront deposit on surety bonds	10.00%mux_SuretyBondsUpfrontDepositPercentage
Changes in the asset retirement obligations
Asset retirement obligation liability, beginning balance	7,247,000us-gaap_AssetRetirementObligation	7,247,000us-gaap_AssetRetirementObligation	6,359,000us-gaap_AssetRetirementObligation
Settlements	(52,000)	(60,000)
Accretion of liability	407,000	461,000	447,000
Adjustment reflecting updated estimates	(131,000)	487,000
Asset retirement obligation liability, ending balance	7,471,000us-gaap_AssetRetirementObligation	7,247,000us-gaap_AssetRetirementObligation	7,247,000us-gaap_AssetRetirementObligation	7,247,000us-gaap_AssetRetirementObligation		7,471,000us-gaap_AssetRetirementObligation
Current portion of the asset retirement obligation	2,427,000	1,392,000	1,400,000	1,392,000		2,427,000
MSC
Mineral Property Interests
Additional discount	20.00%			40.00%	40.00%
Impairment charges	21,200,000
Nevada
Mineral Property Interests
Impairment charges	98,400,000
Recovery of deferred income tax	31,600,000
Argentina
Mineral Property Interests
Mineral property interests	202,889,000	458,203,000	539,092,000	458,203,000		202,889,000
(Gain) loss on sale of assets		316,000
Impairment charges	255,313,000	27,729,000	179,000
Recovery of deferred income tax	3,200,000
Exploration costs	(2,453,000)	(14,776,000)	(25,091,000)
Other Agentina Properties
Mineral Property Interests
Impairment charges	27,000,000
Mexico
Mineral Property Interests
Mineral property interests	10,696,000	11,984,000	12,707,000	11,984,000		10,696,000
Impairment charges			1,343,000
Exploration costs	(5,468,000)	(6,658,000)	(15,918,000)
Los Azules Copper Project
Mineral Property Interests
Mineral property interests	202,889,000	431,190,000		431,190,000		202,889,000
Additional discount	35.00%					35.00%	35.00%
Impairment charges	228,300,000					107,900,000	120,400,000
Recovery of deferred income tax						19,300,000	22,500,000
Los Azules Copper Project \| Argentina
Mineral Property Interests
Impairment charges	228,301,000
Other Argentina exploration properties in San Juan, Argentina
Mineral Property Interests
Mineral property interests		7,818,000		7,818,000
Other Argentina exploration properties in San Juan, Argentina \| Argentina
Mineral Property Interests
Impairment charges	7,817,000
Telken Tenements \| Argentina
Mineral Property Interests
Impairment charges		13,792,000
Este Tenements \| Argentina
Mineral Property Interests
Impairment charges		2,784,000
Piramides Tenements \| Argentina
Mineral Property Interests
Impairment charges		5,079,000
Tobias Tenements \| Argentina
Mineral Property Interests
Impairment charges		6,074,000
Property, plant and equipment \| Argentina
Mineral Property Interests
Impairment charges			179,000
Other United States Properties
Mineral Property Interests
Mineral property interests		9,610,000		9,610,000
Impairment charges			2,900,000
Mineral property interest, carrying value before impairment			2,900,000
Other United States Properties \| Nevada
Mineral Property Interests
Impairment charges	9,611,000	9,497,000	2,902,000
Limo Complex
Mineral Property Interests
Mineral property interests		23,438,000		23,438,000
Limo Complex \| Nevada
Mineral Property Interests
Impairment charges	23,438,000	19,450,000
El Gallo mine
Mineral Property Interests
Undiscounted estimated reclamation costs	4,600,000					4,600,000
Amortization of mineral property interests and asset retirement obligations	1,300,000	1,500,000
Mineral property interests	7,214,000	8,502,000		8,502,000		7,214,000
Tonkin property and El Gallo 1 mine portion of the El Gallo Complex
Mineral Property Interests
Number of most significant properties subject to reclamation obligations	2					2
West Battle Mountain Complex
Mineral Property Interests
Mineral property interests		2,567,000		2,567,000
West Battle Mountain Complex \| Nevada
Mineral Property Interests
Impairment charges	2,567,000	6,287,000
Exploration properties in Santa Cruz, Argentina
Mineral Property Interests
Impairment charges					27,700,000
Recovery of deferred income tax					2,300,000
Exploration properties in Santa Cruz, Argentina \| Nevada
Mineral Property Interests
Impairment charges				28,900,000				6,300,000
Recovery of deferred income tax				10,100,000				2,200,000
Exploration properties in Santa Cruz, Argentina \| Vend-in agreement \| MSC
Mineral Property Interests
Mineral property interests		35,900,000		35,900,000
(Gain) loss on sale of assets				0
Deferred tax liability related to mineral properties transferred		17,300,000		17,300,000
Mexico property interests
Mineral Property Interests
Amortization of mineral property interests	800,000	1,000,000
Amortization of capitalized asset retirement costs	500,000	500,000
Cerro Mojon Tenements in Santa Cruz, Argentina
Mineral Property Interests
Mineral property interests		1,971,000		1,971,000
Cerro Mojon Tenements in Santa Cruz, Argentina \| Argentina
Mineral Property Interests
Impairment charges	1,971,000
La Merced Tenements in Santa Cruz, Argentina
Mineral Property Interests
Mineral property interests		1,891,000		1,891,000
La Merced Tenements in Santa Cruz, Argentina \| Argentina
Mineral Property Interests
Impairment charges	1,891,000
Cabeza de Vaca Tenements in Santa Cruz, Argentina
Mineral Property Interests
Mineral property interests		877,000		877,000
Cabeza de Vaca Tenements in Santa Cruz, Argentina \| Argentina
Mineral Property Interests
Impairment charges	877,000
El Trumai Tenements in Santa Cruz, Argentina
Mineral Property Interests
Mineral property interests		1,534,000		1,534,000
El Trumai Tenements in Santa Cruz, Argentina \| Argentina
Mineral Property Interests
Impairment charges	1,534,000
Martes 13 Tenements in Santa Cruz, Argentina
Mineral Property Interests
Mineral property interests		3,568,000		3,568,000
Martes 13 Tenements in Santa Cruz, Argentina \| Argentina
Mineral Property Interests
Impairment charges	3,568,000
Celestina Tenements in Santa Cruz, Argentina
Mineral Property Interests
Mineral property interests		1,753,000		1,753,000
Celestina Tenements in Santa Cruz, Argentina \| Argentina
Mineral Property Interests
Impairment charges	1,753,000
Other Argentina exploration properties in Santa Cruz, Argentina
Mineral Property Interests
Mineral property interests		7,601,000		7,601,000
Other Argentina exploration properties in Santa Cruz, Argentina \| Argentina
Mineral Property Interests
Impairment charges	7,601,000
North Battle Mountain Complex Located in Nevada, United States
Mineral Property Interests
Mineral property interests	2,227,000	4,148,000		4,148,000		2,227,000
Impairment charges	1,900,000
North Battle Mountain Complex Located in Nevada, United States \| Nevada
Mineral Property Interests
Impairment charges	1,921,000		14,044,000
North Battle Mountain Complex Located in Nevada, United States \| Option agreement
Mineral Property Interests
Impairment charges			14,000,000
Recovery of deferred income tax			4,900,000
Option to earn interest in property after incurring specified cumulative project related expenditures (as a percent)									51.00%
Cumulative project related expenditures to be incurred to earn interest in property									2,400,000
Mineral property interest, carrying value before impairment			18,200,000
Implied value of the option agreement			4,200,000
East Battle Mountain Complex Located in Nevada, United States
Mineral Property Interests
Mineral property interests		4,060,000		4,060,000
East Battle Mountain Complex Located in Nevada, United States \| Nevada
Mineral Property Interests
Impairment charges	4,060,000
Tonkin Complex
Mineral Property Interests
Undiscounted estimated reclamation costs	2,600,000					2,600,000
Mineral property interests	20,423,000	51,946,000		51,946,000		20,423,000
Impairment charges	25,400,000
Tonkin Complex \| Nevada
Mineral Property Interests
Impairment charges	31,391,000
Tonkin Complex \| Asset retirement obligation
Mineral Property Interests
Credit adjusted risk free rate (as a percent)	8.70%	8.70%	8.70%
Inflation rate (as a percent)	3.00%	3.00%	3.00%
Gold Bar Complex
Mineral Property Interests
Mineral property interests	51,577,000	77,012,000		77,012,000		51,577,000
Impairment charges	31,400,000
Gold Bar Complex \| Nevada
Mineral Property Interests
Impairment charges	25,435,000
El Gallo in Mexico \| Asset retirement obligation
Mineral Property Interests
Credit adjusted risk free rate (as a percent)	6.40%	6.40%
Inflation rate (as a percent)	4.10%		3.80%
El Gallo 2 Properties
Mineral Property Interests
Mineral property interests	3,482,000	3,482,000		3,482,000		3,482,000
Impairment charges			1,300,000
El Gallo 2 Properties \| Mexico
Mineral Property Interests
Impairment charges			$ 1,343,000