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Property, plant and equipment (Tables)

9 Months Ended

Sep. 30, 2018

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, 2017		$	67,571			$	77,390			$	40,013			$	81			$	185,055
Asset 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
Asset additions			6,489				-				4,467				10				10,966
Property purchase option acquired			-				2,000				-				-				2,000
Change in decommissioning provision			(110	)			-				-				-				(110	)
Balance at September 30, 2018		$	110,741			$	60,467			$	53,275			$	94			$	224,577

Accumulated depreciation and depletion
Balance at January 1, 2017		$	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
Depreciation/depletion for the period			4,439				-				2,599				6				7,044
Write-down of equipment			-				-				65				-				65
Balance at September 30, 2018		$	39,287			$	50,502			$	28,695			$	45			$	118,529

Carrying value
at December 31, 2017		$	69,514			$	7,965			$	22,777			$	45			$	100,301
at September 30, 2018		$	71,454			$	9,965			$	24,580			$	49			$	106,048