MAJOR SOURCES OF REVENUE (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2021
Centerra
Major sources of revenue
Revenue	$ 95,509	$ 158,167	$ 180,543	$ 156,938
Centerra | Sales Revenue | Customer Concentration Risk
Major sources of revenue
Percentage of total revenue	27.80%	26.10%	30.00%	25.50%
Nevada Gold Mines
Major sources of revenue
Revenue	$ 39,609	$ 101,870	$ 57,730	$ 41,111
Nevada Gold Mines | Sales Revenue | Customer Concentration Risk
Major sources of revenue
Percentage of total revenue	11.50%	16.80%	9.60%	6.70%
Barrick | Sales Revenue | Customer Concentration Risk
Major sources of revenue
Revenue	$ 89,177	$ 75,259	$ 140,421	$ 157,972
Percentage of total revenue	26.00%	12.40%	23.30%	25.70%
Teck | Sales Revenue | Customer Concentration Risk
Major sources of revenue
Revenue	$ 28,076	$ 48,920	$ 47,347	$ 82,164
Percentage of total revenue	8.20%	8.10%	7.90%	13.30%