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MINERAL PROPERTY INTERESTS AND ASSET RETIREMENT OBLIGATIONS (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($) item	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) item	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Mineral Property Interests
Impairment charges	$ 28,542	$ 120,398	$ 28,542	$ 120,398
Recovery of deferred income tax	10,000		10,000
Income tax recovery	(12,321)	(25,034)	(13,484)	(43,991)
Changes in the asset retirement obligations
Amortization of mineral property interests and asset retirement obligations			644	626
Asset retirement obligation liability, beginning balance			7,471	7,247	$ 7,247
Settlements					(52)
Accretion of liability	131	108	232	209	407
Adjustment reflecting updated estimates			354		(131)
Asset retirement obligation liability, ending balance	8,057		8,057		7,471
Current portion of the asset retirement obligation	2,485		2,485		2,427
MSC
Mineral Property Interests
Income tax recovery	2,240	1,182	4,652	7,883	$ 10,503
Gold Bar Project | Nevada
Mineral Property Interests
Impairment charges	19,686		19,686
Tonkin Project | Nevada
Mineral Property Interests
Impairment charges	8,856		8,856
Los Azules Copper Project
Mineral Property Interests
Impairment charges		120,400		120,400
Recovery of deferred income tax		22,500		22,500
Income tax recovery	$ 10,000		$ 10,000
Los Azules Copper Project | Argentina
Mineral Property Interests
Impairment charges		120,398		120,398
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
El Gallo mine
Changes in the asset retirement obligations
Amortization of mineral property interests and asset retirement obligations	$ 300	300	$ 600	600
Amortization of capitalized asset retirement costs	$ 100	$ 100	$ 100	$ 100

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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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