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CONCENTRATION OF RISK: (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) item | Dec. 31, 2018 | Dec. 31, 2017
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 |  |
Cash equivalents |  |  |
Concentration of risk |  |  |
Total cash and short-term investment | $ 2,005.8 |  |
Percentage of total cash | 100.00% |  |
Percentage of cash in US dollars | 97.40% |  |
Cash equivalents | United States |  |  |
Concentration of risk |  |  |
Total cash and short-term investment | $ 1,726.7 |  |
Percentage of total cash | 86.10% |  |
Percentage invested in one institution of country | 14.20% |  |
Percentage invested in one institution of total cash | 12.20% |  |
Cash equivalents | Switzerland |  |  |
Concentration of risk |  |  |
Total cash and short-term investment | $ 126.3 |  |
Percentage of total cash | 6.30% |  |
Percentage invested in one institution of country | 100.00% |  |
Percentage invested in one institution of total cash | 6.30% |  |
Cash equivalents | Peru |  |  |
Concentration of risk |  |  |
Total cash and short-term investment | $ 24.6 |  |
Percentage of total cash | 1.20% |  |
Percentage invested in one institution of country | 72.50% |  |
Percentage invested in one institution of total cash | 0.90% |  |
Cash equivalents | Mexico |  |  |
Concentration of risk |  |  |
Total cash and short-term investment | $ 128.2 |  |
Percentage of total cash | 6.40% |  |
Percentage invested in one institution of country | 87.00% |  |
Percentage invested in one institution of total cash | 5.60% |  |
Accounts receivable trade | Five largest customers |  |  |
Concentration of risk |  |  |
Percentage of accounts receivable and total sales | 37.60% | 34.20% | 28.40%
Accounts receivable trade | Largest customer |  |  |
Concentration of risk |  |  |
Percentage of accounts receivable and total sales | 13.00% | 10.90% | 8.20%
Total sales | Five largest customers |  |  |
Concentration of risk |  |  |
Percentage of accounts receivable and total sales | 28.00% | 28.40% | 25.10%
Total sales | Largest customer |  |  |
Concentration of risk |  |  |
Percentage of accounts receivable and total sales | 10.40% | 9.30% | 8.80%

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