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v2.4.1.9

INVENTORIES (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Ore on leach pads | $ 6,221,000 mux_InventoryOreOnLeachPadsNetOfReserves | $ 2,749,000 mux_InventoryOreOnLeachPadsNetOfReserves
In-process inventory | 2,302,000 us-gaap_InventoryWorkInProcessNetOfReserves | 2,681,000 us-gaap_InventoryWorkInProcessNetOfReserves
Stockpiles |  | 778,000 mux_InventoryOreStockpilesNetOfReserves
Precious metals | 2,403,000 mux_InventoryPreciousMetalsNetOfReserves | 1,300,000 mux_InventoryPreciousMetalsNetOfReserves
Materials and supplies | 1,478,000 us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves | 1,292,000 us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Inventories | 12,404,000 us-gaap_InventoryNet | 8,800,000 us-gaap_InventoryNet
Cost of Sales |  |
Inventory write-down | 2,000,000 us-gaap_InventoryWriteDown / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 0 us-gaap_InventoryWriteDown / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Ore on leach pads |  |
Inventory write-down | 600,000 us-gaap_InventoryWriteDown / us-gaap_PublicUtilitiesInventoryAxis = mux_OreOnLeachPadsMember |
In-process inventory |  |
Inventory write-down | 1,200,000 us-gaap_InventoryWriteDown / us-gaap_PublicUtilitiesInventoryAxis = mux_InProcessInventoryMember |
Precious metals |  |
Inventory write-down | $ 200,000 us-gaap_InventoryWriteDown / us-gaap_PublicUtilitiesInventoryAxis = mux_PreciousMetalsMember |

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- Definition Carrying amount, net of reserves and adjustments, as of the balance sheet date, of ore stockpiled. + References No definition available. + Details
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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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