MAJOR SOURCES OF REVENUE (Details) - Sales Revenue - Customer Concentration Risk - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2022	Jun. 30, 2021	Jun. 30, 2020
Centerra
Major sources of revenue
Revenue	$ 95,509	$ 180,543	$ 156,938	$ 131,425
Percentage of total revenue	27.80%	30.00%	25.50%	26.30%
Barrick
Major sources of revenue
Revenue	$ 89,177	$ 140,421	$ 157,972	$ 125,458
Percentage of total revenue	26.00%	23.30%	25.70%	25.20%
Teck
Major sources of revenue
Revenue	$ 28,076	$ 47,347	$ 82,164	$ 74,219
Percentage of total revenue	8.20%	7.90%	13.30%	14.90%