MOUNT MILLIGAN DEFERRED LIABILITY (Details) $ in Thousands	Feb. 13, 2024 USD ($) tranche oz t $ / oz $ / lb	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Deposit Liability [Line Items]
Value of cash consideration | $		$ 25,000	$ 0
Delivery period after initial transfer	30 days
Mt. Milligan
Deposit Liability [Line Items]
Value of cash consideration | $	$ 24,500
Value of consideration, nonmonetary amount, gold	50,000
Amount of gold per installment	2,500
Cost support agreement, term	5 years
Delivery of gold, first threshold	375,000
Delivery of copper, first threshold | t	30,000
Number of tranches | tranche	3
Amount of gold per tranche	11,111
Delivery of gold, second threshold	665,000
Delivery of copper, second threshold | t	60,000
Gold price, per ounce | $ / oz	1,600
Copper price, per pound | $ / lb	3.50
Gold price by agreement, per ounce | $ / oz	415
Gold price by agreement, percentage of spot price	66.00%
Difference of gold price by agreement, per ounce and spot price | $ / oz	435
Copper price by agreement, per pound	0.35
Mt. Milligan | Cost Support 2030 Through 2035 Example
Deposit Liability [Line Items]
Gold price by agreement, percentage of spot price	50.00%
Mt. Milligan | Cost Support After 2036 Example
Deposit Liability [Line Items]
Gold price by agreement, per ounce | $ / oz	615
Copper price by agreement, per pound	0.51
Mt. Milligan | Suspension Of Cost Support
Deposit Liability [Line Items]
Copper price by agreement, per pound	0.15