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CONCENTRATION OF RISK: (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) item | Dec. 31, 2021 | Dec. 31, 2020
Concentration of risk |  |  |
Number of open-pit copper mines | item | 4 |  |
Number of underground poly metallic mines | item | 5 |  |
Number of smelters | item | 2 |  |
Number of refineries | item | 9 |  |
Total cash and short-term investment | $ 2,278.0 |  |
Cash equivalents |  |  |
Concentration of risk |  |  |
Total cash and short-term investment | $ 2,278.0 |  |
Percentage of total cash | 100.00% |  |
Percentage of cash in US dollars | 96.40% |  |
Cash equivalents | United States |  |  |
Concentration of risk |  |  |
Total cash and short-term investment | $ 1,903.8 |  |
Percentage of total cash | 83.60% |  |
Percentage invested in one institution of country | 12.40% |  |
Percentage invested in one institution of total cash | 10.30% |  |
Cash equivalents | Switzerland |  |  |
Concentration of risk |  |  |
Total cash and short-term investment | $ 227.2 |  |
Percentage of total cash | 10.00% |  |
Percentage invested in one institution of country | 100.00% |  |
Percentage invested in one institution of total cash | 10.00% |  |
Cash equivalents | Peru |  |  |
Concentration of risk |  |  |
Total cash and short-term investment | $ 41.6 |  |
Percentage of total cash | 1.80% |  |
Percentage invested in one institution of country | 75.10% |  |
Percentage invested in one institution of total cash | 1.40% |  |
Cash equivalents | Mexico |  |  |
Concentration of risk |  |  |
Total cash and short-term investment | $ 105.4 |  |
Percentage of total cash | 4.60% |  |
Percentage invested in one institution of country | 56.40% |  |
Percentage invested in one institution of total cash | 2.60% |  |
Accounts receivable trade | Five largest customers | Customer |  |  |
Concentration of risk |  |  |
Percentage of accounts receivable and total sales | 34.20% | 31.30% | 35.30%
Accounts receivable trade | Largest customer | Customer |  |  |
Concentration of risk |  |  |
Percentage of accounts receivable and total sales | 10.40% | 11.80% | 12.90%
Total sales | Five largest customers | Customer |  |  |
Concentration of risk |  |  |
Percentage of accounts receivable and total sales | 25.70% | 25.00% | 28.10%
Total sales | Largest customer | Customer |  |  |
Concentration of risk |  |  |
Percentage of accounts receivable and total sales | 6.80% | 7.20% | 10.00%

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