Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2019

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

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

Dec. 31, 2019		Exploration and evaluation assets		Capital works in progress			Mining properties			Plant and equipment			Plant and equipment- ROU assets			Total
Balance, Jan. 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
Acquisition (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	)		-
Impairment (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, Jan. 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

Dec. 31, 2018		Exploration and evaluation assets			Capital works in progress			Mining properties			Plant and equipment			Plant and equipment- ROU assets1		Total
Balance, Dec. 31, 2017	$	23,010		$	933,531		$	1,975,061		$	2,536,019		$	-	$	5,467,621
Additions		9,950			88,920			-			16,689			-		115,559
Acquisitions		21,654			-			-			-			-		21,654
Capitalized stripping and development		-			-			84,023			-			-		84,023
Decommissioning and restoration		-			15			1,711			7,272			-		8,998
Interest capitalized		-			13,172			-			-			-		13,172
Transfers and other movements		-			(152,781	)		2,132			150,649			-		-
Disposals		(1,208	)		(4,034	)		-			(9,749	)		-		(14,991	)
Effects of movements in exchange rates		(1,197	)		(3,873	)		(65,434	)		(62,757	)		-		(133,261	)
Other		(3	)		(1,169	)		946			224			-		(2	)
Balance, Dec. 31, 2018		52,206			873,781			1,998,439			2,638,347			-		5,562,773
IFRS 16 Adjustments1		-			-			-			(165,171	)		180,151		14,980
Balance, Jan. 1, 2019		52,206			873,781			1,998,439			2,473,176			180,151		5,577,753
Accumulated depreciation
Balance, Dec. 31, 2017		-			-			683,183			820,205			-		1,503,388
Depreciation for the year		-			-			141,218			189,354			-		330,572
Disposals		-			-			-			(6,780	)		-		(6,780	)
Effects of movement in exchange rates		-			-			(43,469	)		(40,211	)		-		(83,680	)
Other		-			-			(178	)		(361	)		-		(539	)
Balance, Dec. 31, 2018		-			-			780,754			962,207			-		1,742,961
IFRS 16 Adjustments1		-			-			-			(89,877	)		89,877		-
Balance, Jan. 1, 2019		-			-			780,754			872,330			89,877		1,742,961
Net book value, Dec.31, 2018		52,206			873,781			1,217,685			1,676,140			-		3,819,812
Net book value, Jan.1, 2019	$	52,206		$	873,781		$	1,217,685		$	1,600,846		$	90,274	$	3,834,792
1 IFRS 16 is effective January 1, 2019 for prospective periods. For further information about the adoption of IFRS 16, refer to Note 4.

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

		Decrease in FVLCD as at
Change in key assumption		Sep. 30, 2019
Decrease of 10% in the average LOM copper prices	$	308,148
1.0 percentage point increase in the real discount rate		135,733
One year additional delay in the start of project construction		76,921