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REVENUE - Narrative (Details) ozt in Thousands, lb in Millions, $ in Millions | 12 Months Ended
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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% |

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