Revenue and expenses (Tables)

12 Months Ended

Dec. 31, 2020

Analysis of income and expense [abstract]

Disclosure of detailed information about revenue [Table Text Block]

		Year ended December 31,
		2020			2019
Copper	$	563,910		$	786,332
Zinc		264,106			284,897
Gold		180,949			120,366
Silver		25,986			29,315
Molybdenum		25,627			31,270
Other		5,619			4,760
		1,066,197			1,256,940
Non-cash streaming arrangement items 1
Amortization of deferred revenue - gold		27,854			32,028
Amortization of deferred revenue - silver		39,409			60,370
Amortization of deferred revenue - variable consideration adjustments - prior periods		6,668			(16,295	)
		73,931			76,103
Pricing and volume adjustments 2		9,178			(12,123	)
		1,149,306			1,320,920
Treatment and refining charges		(56,888	)		(83,481	)
	$	1,092,418		$	1,237,439
1 See note 18.
2 Pricing and volume adjustments represent mark-to-market adjustments on initial estimate of provisionally priced sales, realized and unrealized changes to fair value for non-hedge derivative contracts and adjustments to originally invoiced weights and assays.

Disclosure of depreciation and amortization expense [Table Text Block]

		Year ended December 31,
		2020		2019
Cost of sales	$	361,827	$	344,555
Selling and administrative expenses		1,776		2,079
	$	363,603	$	346,634

Disclosure of detailed information about share-based payment expenses (recoveries) [Table Text Block]

		Cash-settled								Total share-based compensation expense
		RSUs		DSUs		PSUs		Stock options
Year ended December 31, 2020
Cost of sales	$	1,400	$	—	$	—	$	—	$	1,400
Selling and administrative		4,872		5,149		1,987		1,122		13,130
Other expenses		478		—		—		—		478
	$	6,750	$	5,149	$	1,987	$	1,122	$	15,008
Year ended December 31, 2019
Cost of sales	$	400	$	—	$	—	$	—	$	400
Selling and administrative		928		1,157		—		—		2,085
Other expenses		229		—		—		—		229
	$	1,557	$	1,157	$	—	$	—	$	2,714

Disclosure of detailed information about other operating expense [Table Text Block]

		Year ended December 31,
		2020		2019
Regional costs	$	3,602	$	3,780
Loss on disposal of property, plant and equipment		5,088		4,807
Closure cost adjustment - non-producing properties		2,721		2,289
Allocation of community costs		2,880		2,216
Write down of UCM receivable		—		25,978
Pampacancha delivery obligation		—		7,499
Other		3,292		4,547
	$	17,583	$	51,116

Disclosure of detailed information about impairment [Table Text Block]

		Arizona
Pre-tax impairment to:
Property, plant & equipment	$	322,249
Tax impact - (recovery)		(80,143	)
After-tax impairment charge	$	242,106

Disclosure of detailed information about employee benefits expense [Table Text Block]

		Year ended December 31,
		2020		2019
Current employee benefits	$	179,486	$	171,173
Share-based compensation (notes 6c, 19, 24)
Equity settled stock options		1,122		—
Cash-settled restricted share units		6,750		1,557
Cash-settled deferred share units		5,149		1,157
Cash-settled performance share units		1,987		—
Employee share purchase plan		1,783		1,645
Post-employee pension benefits
Defined benefit plans		11,671		10,643
Defined contribution plans		1,774		1,635
Other post-retirement employee benefits		9,305		8,457
Termination benefits		582		628
	$	219,609	$	196,895

Disclosure of detailed information about finance income and expenses [Table Text Block]

		Year ended December 31,
		2020			2019
Net interest expense on long-term debt
Interest expense on long-term debt	$	82,712		$	78,265
Interest capitalized		—			(9,890	)
		82,712			68,375
Accretion on streaming arrangements (note 18)
Current year additions		60,362			63,725
Variable consideration adjustments - prior periods		(3,692	)		6,047
		56,670			69,772
Change in fair value of financial assets and liabilities at fair value through profit or loss
Embedded derivatives		(45,387	)		3,708
Gold prepayment liability		20,141			—
Investments		(4,124	)		4,539
		(29,370	)		8,247
Other net finance costs
Net foreign exchange (gains) losses		(1,644	)		1,388
Accretion on community agreements measured at amortized cost		3,641			1,222
Unwinding of discounts on provisions		3,543			4,392
Withholding taxes		8,267			8,100
Premium paid on redemption of notes (note 17)		7,252			—
Write-down of unamortized transaction costs (note 17)		3,817			—
Other finance expense		8,826			11,027
Interest income		(1,812	)		(8,527	)
		31,890			17,602
Net finance expense	$	141,902		$	163,996