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Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Accounting Policies, Changes In Accounting Policies And Errors [Abstract]

Depreciation methods and estimated useful lives for other plant and equipment


			Cost			Accumulated depletion			Net book value
Balance, December 31, 2019			$	11,128,297		$	(5,740,408)		$	5,387,889
Capital expenditures			275,850			—			275,850

Transfers from exploration and evaluation assets (note 5)			8,585			—			8,585
Change in asset retirement obligations (note 9)			94,994			—			94,994
Property swaps			(1,190)			178			(1,012)
Impairment			—			(2,247,162)			(2,247,162)
Foreign currency translation			(82,860)			120,123			37,263
Depletion			—			(478,859)			(478,859)
Balance, December 31, 2020			$	11,423,676		$	(8,346,128)		$	3,077,548
Capital expenditures			310,005			—			310,005

Property acquisitions			274			—			274
Divestitures			(37,835)			32,844			(4,991)
Property swaps			(26,131)			25,900			(231)
Transfers from exploration and evaluation assets (note 5)			7,727			—			7,727
Change in asset retirement obligations (note 9)			(12,222)			—			(12,222)
Impairment reversal			—			1,542,414			1,542,414
Foreign currency translation			(31,977)			34,765			2,788
Depletion			—			(458,941)			(458,941)
Balance, December 31, 2021			$	11,633,517		$	(7,169,146)		$	4,464,371