SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Risks and Uncertainties (Details) - USD ($) $ in Millions				12 Months Ended
	Feb. 09, 2021	Jan. 29, 2021	Sep. 10, 2020	Dec. 31, 2021
Duration current portion of inventories expected to be processed or recovered				12 months
Duration over which drilling and related costs are capitalized				1 year
Equity Financing In February 2021
Gross proceeds	$ 31.5
Canadian Development Expenses | Equity Financing In February 2021
Gross proceeds				$ 31.5
Canadian Development Expenses | Flow Through Common Shares
Gross proceeds		$ 12.7		12.7
Canadian Development Expenses | Flow Through Common Shares | Los Azules Copper Project
Gross proceeds				$ 40.0
Canadian Exploration Expenditures | Flow Through Common Shares
Gross proceeds			$ 10.4