MINERAL PROPERTIES, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2020

Property, plant and equipment [abstract]

Disclosure of detailed information about property, plant and equipment

	December 31, 2020
	Plant and equipment (1)		Construction in process		Mineral properties subject to depletion		Mineral properties not yet subject to depletion		Exploration and evaluation assets		Total
Cost
Balance, beginning of year	$	663,368	$	28,208	$	539,378	$	80,296	$	127,141	$	1,438,391
Alacer acquisition (note 4(a))	926,228		26,874		882,742		146,086		807,902		2,789,832
Additions	2,927		104,475		55,477		2,714		7,980		173,573
Disposals/removal of fully depreciated assets	(22,466)		(297)		(24,373)		—		—		(47,136)
Change in reclamation and closure cost provision	—		—		8,799		—		1,388		10,187
Transfers	105,226		(116,253)		14,593		(3,568)		2		—
Balance, end of year	1,675,283		43,007		1,476,616		225,528		944,413		4,364,847
Accumulated depletion and depreciation
Balance, beginning of year	(375,398)		—		(293,531)		—		—		(668,929)
Depletion and depreciation	(73,041)		—		(97,757)		—		—		(170,798)
Disposals/removal of fully depreciated assets	16,412		—		24,373		—		—		40,785
Balance, end of year	(432,027)		—		(366,915)		—		—		(798,942)
Carrying amount at December 31, 2020	$	1,243,256	$	43,007	$	1,109,701	$	225,528	$	944,413	$	3,565,905

9.MINERAL PROPERTIES, PLANT AND EQUIPMENT (continued)

	December 31, 2019
	Plant and equipment (1)		Construction in process		Mineral properties subject to depletion		Mineral properties not yet subject to depletion		Exploration and evaluation assets		Total
Cost
Balance, beginning of year	$	577,023	$	44,859	$	463,548	$	101,990	$	91,228	$	1,278,648
Additions	6,515		75,636		42,373		7,145		35,275		166,944
Disposals	(12,457)		—		(2,962)		—		(434)		(15,853)
Change in reclamation and closure cost provision	—		—		7,580		—		1,072		8,652
Transfers	92,287		(92,287)		28,839		(28,839)		—		—
Balance, end of year	663,368		28,208		539,378		80,296		127,141		1,438,391
Accumulated depreciation and depletion
Balance, beginning of year	(338,153)		—		(239,320)		—		—		(577,473)
Depreciation and depletion	(48,226)		—		(55,783)		—		—		(104,009)
Disposals	10,981		—		1,572		—		—		12,553
Balance, end of year	(375,398)		—		(293,531)		—		—		(668,929)
Carrying amount at December 31, 2019	$	287,970	$	28,208	$	245,847	$	80,296	$	127,141	$	769,462

(1)At December 31, 2020, plant and equipment includes right-of-use assets with a carrying amount of $121.6 million (2019 - $3.5 million) (note 16).