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REVENUE - Narrative (Details)
ozt in Thousands, lb in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
customers
lb
ozt
$ / ounce
$ / pound
Dec. 31, 2020
USD ($)
lb
ozt
$ / pound
$ / ounce
Copper [Member]    
Disclosure of provisional metal sales    
Volumes subject to final pricing Copper (millions) Gold (000s) | lb 45 49
Impact on net income before taxation of 10% movement in market price $ 20 $ 16
Average price of sales subject to final settlement | $ / pound 4.34 3.17
Percent change in commodity prices used for sensitivity analysis 10.00%  
Gold [Member]    
Disclosure of provisional metal sales    
Percentage of composition of principal product (as percent) 90.00%  
Volumes subject to final pricing Copper (millions) Gold (000s) | ozt 41 22
Impact on net income before taxation of 10% movement in market price $ 8 $ 4
Average price of sales subject to final settlement | $ / ounce 1,819 1,899
Percent change in commodity prices used for sensitivity analysis 10.00%  
Customers who contribute over ten percent of revenue    
Disclosure of major customers [line items]    
Number of customers who accounts for more than ten percent of revenue | customers 3  
Minimum percentage of entity revenue for major customers 10.00%  
Customer 1 [Member]    
Disclosure of major customers [line items]    
Percentage of entity's revenue 24.00%  
Customer 2 [Member]    
Disclosure of major customers [line items]    
Percentage of entity's revenue 13.00%  
Customer 3 [Member]    
Disclosure of major customers [line items]    
Percentage of entity's revenue 10.00%