Environmental Rehabilitation Provision (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure Of Environmental Rehabilitation Provision [Abstract]

Disclosure of environmental rehabilitation provision [Table Text Block]

		Year ended December 31,
		2021			2020
Environmental Rehabilitation Provision - beginning of period	$	51,750		$	52,525
Change in estimate		330			(2,315	)
Liabilities discharged		(645	)		(543	)
Accretion expense		1,934			2,083
Environmental Rehabilitation Provision - end of period		53,369			51,750
Less current portion		(1,050	)		(893	)
Non-current portion	$	52,319		$	50,857