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CONCENTRATION OF RISK: (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) item | Dec. 31, 2019 | Dec. 31, 2018
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 | 10 |  |
Total cash and short-term investment | $ 2,594.4 |  |
Cash equivalents |  |  |
Concentration of risk |  |  |
Total cash and short-term investment | $ 2,594.4 |  |
Percentage of total cash | 100.00% |  |
Percentage of cash in US dollars | 97.00% |  |
Cash equivalents | United States |  |  |
Concentration of risk |  |  |
Total cash and short-term investment | $ 1,968.8 |  |
Percentage of total cash | 75.90% |  |
Percentage invested in one institution of country | 14.10% |  |
Percentage invested in one institution of total cash | 10.70% |  |
Cash equivalents | Switzerland |  |  |
Concentration of risk |  |  |
Total cash and short-term investment | $ 340.3 |  |
Percentage of total cash | 13.10% |  |
Percentage invested in one institution of country | 79.40% |  |
Percentage invested in one institution of total cash | 10.40% |  |
Cash equivalents | Peru |  |  |
Concentration of risk |  |  |
Total cash and short-term investment | $ 35.5 |  |
Percentage of total cash | 1.40% |  |
Percentage invested in one institution of country | 81.40% |  |
Percentage invested in one institution of total cash | 1.10% |  |
Cash equivalents | Mexico |  |  |
Concentration of risk |  |  |
Total cash and short-term investment | $ 249.8 |  |
Percentage of total cash | 9.60% |  |
Percentage invested in one institution of country | 53.80% |  |
Percentage invested in one institution of total cash | 5.20% |  |
Accounts receivable trade | Five largest customers |  |  |
Concentration of risk |  |  |
Percentage of accounts receivable and total sales | 35.30% | 37.60% | 34.20%
Accounts receivable trade | Largest customer |  |  |
Concentration of risk |  |  |
Percentage of accounts receivable and total sales | 12.90% | 13.00% | 10.90%
Total sales | Five largest customers |  |  |
Concentration of risk |  |  |
Percentage of accounts receivable and total sales | 28.10% | 28.00% | 28.40%
Total sales | Largest customer |  |  |
Concentration of risk |  |  |
Percentage of accounts receivable and total sales | 10.00% | 10.40% | 9.30%

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