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Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of detailed information about property, plant and equipment [abstract]

Schedule of Property, Plant and Equipment

		Mining				Non-producing				Plant and				Corporate office
		interests				properties				equipment				equipment				Total

Cost
Balance at January 1, 2016		$	63,954			$	75,746			$	38,196			$	161			$	178,057
Assets additions			4,569				1,583				1,817				3				7,972
Change in decommissioning provision			(952	)			61				-				-				(891	)
Disposals			-				-				-				(83	)			(83	)
Balance at December 31, 2016			67,571				77,390				40,013				81				185,055
Assets additions			5,233				5,526				8,795				3				19,557
Property purchase option acquired			-				7,108				-				-				7,108
Change in decommissioning provision			(37	)			38				-				-				1
Reclassification			31,595				(31,595	)			-				-				-
Balance at December 31, 2017		$	104,362			$	58,467			$	48,808			$	84			$	211,721

Accumulated depreciation
and depletion
Balance at January 1, 2016		$	28,298			$	50,502			$	18,305			$	77			$	97,182
Depreciation/depletion for the year			3,112				-				4,261				15				7,388
Disposals			-				-				-				(63	)			(63	)
Balance at December 31, 2016			31,410				50,502				22,566				29				104,507
Depreciation/depletion for the year			3,438				-				3,261				10				6,709
Write-down of equipment			-				-				204				-				204
Balance at December 31, 2017		$	34,848			$	50,502			$	26,031			$	39			$	111,420

Carrying value
at December 31, 2016		$	36,161			$	26,888			$	17,447			$	52			$	80,548
at December 31, 2017		$	69,514			$	7,965			$	22,777			$	45			$	100,301