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RECLAMATION PROVISION (Tables)

12 Months Ended

Dec. 31, 2017

Asset retirement obligation

Asset retirement obligation and environmental remediation liability

Schedule of environmental remediation liability and reclamation provisions

			Year Ended December 31, 2017			Year Ended December 31, 2016

Asset retirement obligations – long-term, beginning of year		$	259,706		$	269,068

Asset retirement obligations – current, beginning of year			5,953			4,443

Current year additions and changes in estimate, net			58,891			(9,112	)

Current year accretion			5,247			3,847

Liabilities settled			(1,115	)		(1,113	)

Foreign exchange revaluation			21,004			(1,474	)

Reclassification from long-term to current, end of year			(8,609	)		(5,953	)

Asset retirement obligations – long-term, end of year		$	341,077		$	259,706

Environmental remediation liability

Asset retirement obligation and environmental remediation liability

Schedule of environmental remediation liability and reclamation provisions

			Year Ended December 31, 2017			Year Ended December 31, 2016

Environmental remediation liability – long-term, beginning of year		$	5,602		$	7,231

Environmental remediation liability – current, beginning of year			3,240			1,802

Current year additions and changes in estimate, net			850			243

Liabilities settled			(4,559	)		(1,606	)

Foreign exchange revaluation			487			1,172

Reclassification from long-term to current, end of year			(1,429	)		(3,240	)

Environmental remediation liability – long-term, end of year		$	4,191		$	5,602