MATERIAL ACCOUNTING POLICY INFORMATION - Property, plant and equipment (Details)	12 Months Ended
	Dec. 31, 2025
Property and buildings \| Minimum
MATERIAL ACCOUNTING POLICY INFORMATION
Estimated useful lives of property, plant and equipment	10 years
Property and buildings \| Maximum
MATERIAL ACCOUNTING POLICY INFORMATION
Estimated useful lives of property, plant and equipment	25 years
Geological equipment and other facilities \| Minimum
MATERIAL ACCOUNTING POLICY INFORMATION
Estimated useful lives of property, plant and equipment	2 years
Geological equipment and other facilities \| Maximum
MATERIAL ACCOUNTING POLICY INFORMATION
Estimated useful lives of property, plant and equipment	20 years
Computer equipment \| Minimum
MATERIAL ACCOUNTING POLICY INFORMATION
Estimated useful lives of property, plant and equipment	2 years
Computer equipment \| Maximum
MATERIAL ACCOUNTING POLICY INFORMATION
Estimated useful lives of property, plant and equipment	5 years
Office furniture and equipment
MATERIAL ACCOUNTING POLICY INFORMATION
Estimated useful lives of property, plant and equipment	5 years
Vehicles \| Minimum
MATERIAL ACCOUNTING POLICY INFORMATION
Estimated useful lives of property, plant and equipment	3 years
Vehicles \| Maximum
MATERIAL ACCOUNTING POLICY INFORMATION
Estimated useful lives of property, plant and equipment	7 years
Mobile equipment \| Minimum
MATERIAL ACCOUNTING POLICY INFORMATION
Estimated useful lives of property, plant and equipment	2 years
Mobile equipment \| Maximum
MATERIAL ACCOUNTING POLICY INFORMATION
Estimated useful lives of property, plant and equipment	10 years