Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2020

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

Disclosure of detailed information about property, plant and equipment [Table Text Block]

Dec. 31, 2020		Exploration and evaluation assets		Capital works in progress			Mining properties			Plant and equipment			Plant and equipment- ROU assets			Total
Balance, Jan. 1, 2020	$	69,903	$	733,874		$	2,146,583		$	2,653,752		$	201,972		$	5,806,084
Additions		809		256,251			311			28,523			17,759			303,653
Capitalized stripping and development		—		—			83,137			—			—			83,137
Decommissioning and restoration		—		263			6,849			39,680			—			46,792
Interest capitalized		—		—			—			—			—			—
Transfers and other movements		8,040		(36,668	)		(41,256	)		70,777			(893	)		—
Disposals		—		—			—			(19,681	)		(5,884	)		(25,565	)
Effects of movements in exchange rates		307		3,442			21,837			20,668			1,349			47,603
Balance, Dec. 31, 2020		79,059		957,162			2,217,461			2,793,719			214,303			6,261,704
Accumulated depreciation
Balance, Jan. 1, 2020		—		—			963,530			1,069,687			110,308			2,143,525
Depreciation for the year		—		—			146,113			200,632			23,351			370,096
Disposals		—		—			—			(14,038	)		(2,475	)		(16,513	)
Effects of movement in exchange rates		—		—			16,631			15,300			1,010			32,941
Balance, Dec. 31, 2020		—		—			1,126,274			1,271,581			132,194			2,530,049
Net book value	$	79,059	$	957,162		$	1,091,187		$	1,522,138		$	82,109		$	3,731,655

Dec. 31, 2019		Exploration and evaluation assets		Capital works in progress			Mining properties			Plant and equipment			Plant and equipment- ROU assets1			Total
Balance, January 1, 2019	$	52,206	$	873,781		$	1,998,439		$	2,473,176		$	180,151		$	5,577,753
Additions		17,016		109,372			—			33,309			22,158			181,855
Acquisitions (note 5)		—		91,332			3,157			—			373			94,862
Capitalized stripping and development		—		—			103,108			—			—			103,108
Decommissioning and restoration		—		41			3,314			86,053			—			89,408
Interest capitalized		—		9,890			—			—			—			9,890
Transfers and other movements		—		(30,000	)		642			30,406			(1,048	)		—
Impairments (note 6e)		—		(322,249	)		—			—			—			(322,249	)
Disposals		—		(2,029	)		—			(10,747	)		(1,533	)		(14,309	)
Effects of movements in exchange rates		681		1,528			41,080			38,452			1,793			83,534
Other		—		2,208			(3,157	)		3,103			78			2,232
Balance, Dec. 31, 2019		69,903		733,874			2,146,583			2,653,752			201,972			5,806,084
Accumulated depreciation
Balance, January 1, 2019		—		—			780,754			872,330			89,877			1,742,961
Depreciation for the year		—		—			154,970			179,062			19,850			353,882
Disposals		—		—			—			(6,675	)		—			(6,675	)
Effects of movement in exchange rates		—		—			27,806			24,970			581			53,357
Balance, Dec. 31, 2019		—		—			963,530			1,069,687			110,308			2,143,525
Net book value	$	69,903	$	733,874		$	1,183,053		$	1,584,065		$	91,664		$	3,662,559