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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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Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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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 INTERESTS AND ASSET RETIREMENT OBLIGATIONS (Details) $ in Thousands	3 Months Ended						12 Months Ended
	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2013 USD ($)	Jun. 30, 2013 USD ($)	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2014 USD ($)
Minerals Property Interests [Line Items]
Mineral property interests	$ 237,245	$ 287,812		$ 642,968			$ 237,245	$ 287,812	$ 642,968
Impairment charges							50,600	353,736	62,963
Recovery of deferred income tax							10,400	76,600
Income tax recovery							(24,560)	(107,170)	(53,365)
Exploration costs							$ (8,798)	(11,332)	(24,829)
Deferred tax liability related to mineral properties transferred		214						214
Percentage of annual fees on surety bonds							1.50%
Percentage of upfront deposit on surety bonds							10.00%
Changes in the asset retirement obligations
Cash bonding for mineral properties in the United States	4,800	4,800					$ 4,800	4,800		$ 4,800
Amortization of mineral property interests and asset retirement obligations							1,288	1,236	1,530
Asset retirement obligation liability, beginning balance							7,471	7,247
Settlements								(52)
Accretion of liability							429	407	461
Adjustment reflecting updated estimates							(116)	(131)
Asset retirement obligation liability, ending balance	7,784	7,471		7,247			7,784	7,471	7,247
Current portion of the asset retirement obligation	215	2,427					$ 215	2,427
MSC
Minerals Property Interests [Line Items]
Additional discount							20.00%
Impairment charges								21,200
Income tax recovery							$ 15,942	10,503	$ 17,145
Nevada
Minerals Property Interests [Line Items]
Impairment charges							29,700	98,400
Recovery of deferred income tax								31,600
Los Azules Copper Project
Minerals Property Interests [Line Items]
Mineral property interests	191,490	202,889					$ 191,490	202,889
Impairment charges	11,400	107,900	$ 120,400
Recovery of deferred income tax	$ 1,300	19,300	$ 22,500
Tonkin property and El Gallo 1 mine portion of the El Gallo Complex
Changes in the asset retirement obligations
Number of most significant properties subject to reclamation obligations \| item	2						2
Tonkin Complex
Minerals Property Interests [Line Items]
Mineral property interests	$ 4,833	20,423					$ 4,833	20,423
Impairment charges	6,100
Recovery of deferred income tax	1,700
Changes in the asset retirement obligations
Undiscounted estimated reclamation costs	2,700						2,700
Tonkin Complex \| Nevada
Minerals Property Interests [Line Items]
Impairment charges							$ 20,847	$ 25,435
Tonkin Complex \| Asset retirement obligation
Minerals Property Interests [Line Items]
Credit adjusted risk free rate (as a percent)							6.80%	8.70%	8.70%
Inflation rate (as a percent)							1.69%	3.00%	3.00%
Changes in the asset retirement obligations
Fair Value Assumptions, Risk Free Interest Rate							6.80%	8.70%	8.70%
Fair Value Assumptions Inflation Rate							1.69%	3.00%	3.00%
El Gallo mine
Minerals Property Interests [Line Items]
Mineral property interests	5,925	7,214					$ 5,925	$ 7,214
Changes in the asset retirement obligations
Undiscounted estimated reclamation costs	6,800						6,800
Amortization of mineral property interests and asset retirement obligations							1,300	1,300
Other United States Properties \| Nevada
Minerals Property Interests [Line Items]
Impairment charges								9,611	$ 9,497
Limo Complex \| Nevada
Minerals Property Interests [Line Items]
Impairment charges								23,438	19,450
West Battle Mountain Complex \| Nevada
Minerals Property Interests [Line Items]
Impairment charges								2,567	6,287
Exploration properties in Santa Cruz, Argentina
Minerals Property Interests [Line Items]
Impairment charges						$ 27,700
Recovery of deferred income tax						$ 2,300
Exploration properties in Santa Cruz, Argentina \| Nevada
Minerals Property Interests [Line Items]
Impairment charges				28,900	$ 6,300
Recovery of deferred income tax				10,100	$ 2,200
Exploration properties in Santa Cruz, Argentina \| Vend-in agreement \| MSC
Minerals Property Interests [Line Items]
Mineral property interests				35,900					35,900
Deferred tax liability related to mineral properties transferred				17,300					$ 17,300
Mexico property interests
Minerals Property Interests [Line Items]
Amortization of mineral property interests							800	800
Changes in the asset retirement obligations
Amortization of capitalized asset retirement costs							500	500
North Battle Mountain Complex Located in Nevada, United States
Minerals Property Interests [Line Items]
Mineral property interests	785	2,227					785	2,227
Impairment charges	1,400
Recovery of deferred income tax	500
North Battle Mountain Complex Located in Nevada, United States \| Nevada
Minerals Property Interests [Line Items]
Impairment charges							1,443	1,921
East Battle Mountain Complex Located in Nevada, United States \| Nevada
Minerals Property Interests [Line Items]
Impairment charges								4,060
Gold Bar Complex
Minerals Property Interests [Line Items]
Mineral property interests	30,730	51,577					30,730	51,577
Gold Bar Complex \| Nevada
Minerals Property Interests [Line Items]
Impairment charges							$ 14,939	$ 31,391
El Gallo in Mexico \| Asset retirement obligation
Minerals Property Interests [Line Items]
Credit adjusted risk free rate (as a percent)							6.80%	6.40%
Inflation rate (as a percent)								1.40%	4.10%
Changes in the asset retirement obligations
Fair Value Assumptions, Risk Free Interest Rate							6.80%	6.40%
Fair Value Assumptions Inflation Rate								1.40%	4.10%
El Gallo 2 Properties
Minerals Property Interests [Line Items]
Mineral property interests	3,482	3,482					$ 3,482	$ 3,482
Impairment charges	2,000
Mineral property interest, carrying value before impairment	2,000						2,000
Gold Bar Project \| Nevada
Minerals Property Interests [Line Items]
Impairment charges							20,800
Tonkin Project \| Nevada
Minerals Property Interests [Line Items]
Impairment charges							8,900
Argentina
Minerals Property Interests [Line Items]
Mineral property interests	191,490	202,889		458,203			191,490	202,889	$ 458,203
Impairment charges							11,399	255,313	27,729
Recovery of deferred income tax								3,200
Income tax recovery							(10,759)	(74,952)	(38,015)
Exploration costs							(1,481)	(2,453)	(14,776)
Argentina \| Los Azules Copper Project
Minerals Property Interests [Line Items]
Impairment charges							11,399	228,301
Argentina \| Telken Tenements
Minerals Property Interests [Line Items]
Impairment charges									13,792
Argentina \| Este Tenements
Minerals Property Interests [Line Items]
Impairment charges									2,784
Argentina \| Piramides Tenements
Minerals Property Interests [Line Items]
Impairment charges									5,079
Argentina \| Tobias Tenements
Minerals Property Interests [Line Items]
Impairment charges									6,074
Argentina \| Cerro Mojon Tenements in Santa Cruz, Argentina
Minerals Property Interests [Line Items]
Impairment charges								1,971
Argentina \| La Merced Tenements in Santa Cruz, Argentina
Minerals Property Interests [Line Items]
Impairment charges								1,891
Argentina \| Cabeza de Vaca Tenements in Santa Cruz, Argentina
Minerals Property Interests [Line Items]
Impairment charges								877
Argentina \| El Trumai Tenements in Santa Cruz, Argentina
Minerals Property Interests [Line Items]
Impairment charges								1,534
Argentina \| Martes 13 Tenements in Santa Cruz, Argentina
Minerals Property Interests [Line Items]
Impairment charges								3,568
Argentina \| Property, plant and equipment
Minerals Property Interests [Line Items]
Impairment charges							1,972
Argentina \| Other Argentina exploration properties in San Juan, Argentina
Minerals Property Interests [Line Items]
Impairment charges								7,817
Argentina \| Celestina Tenements in Santa Cruz, Argentina
Minerals Property Interests [Line Items]
Impairment charges								1,753
Argentina \| Other Argentina exploration properties in Santa Cruz, Argentina
Minerals Property Interests [Line Items]
Impairment charges								7,601
Other Argentina Properties
Minerals Property Interests [Line Items]
Impairment charges								27,000
Mexico
Minerals Property Interests [Line Items]
Mineral property interests	$ 9,408	$ 10,696		$ 11,984			9,408	10,696	11,984
Impairment charges							1,972
Income tax recovery							(1,292)	(371)	(495)
Exploration costs							$ (4,526)	$ (5,468)	$ (6,658)