COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands			1 Months Ended	6 Months Ended		7 Months Ended	12 Months Ended			15 Months Ended
	Oct. 08, 2021	Apr. 07, 2021	Feb. 28, 2022	Dec. 31, 2021	Dec. 31, 2020	Oct. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Jan. 31, 2021	Feb. 25, 2019
Commitments and Contingencies
Acquisition consideration paid				$ 281,066	$ 48,832		$ 168,147	$ 155,985	$ 1,055
Ilovica
Commitments and Contingencies
Conditional funding from acquisition				163,750
Khoemacau
Commitments and Contingencies
Total commitments				$ 26,500
Acquisition consideration paid	$ 15,900	$ 10,600				$ 26,500				$ 212,000
Silver production acquired (as a percent)		90.00%		90.00%							80.00%
Khoemacau | Forecast
Commitments and Contingencies
Acquisition consideration paid			$ 26,500
Silver production acquired (as a percent)			100.00%