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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) item t segment $ / lb | Dec. 31, 2019 $ / lb | Dec. 31, 2018 $ / lb
Financial information related to segments |  |  |
Decrease in inventory capitalized material | $ | $ 196.4 |  |
Increase in inventory consumption | $ | $ 29.3 |  |
Significant Accounting Policies |  |  |
Increase in total reserves at a property to qualify as a major expansion (as a percent) | 10.00% |  |
Period considered for calculation of average metal price | 3 years |  |
Current price of copper (in dollars per pound) | $ / lb | 2.816 | 2.818 | 2.642
Impairment in the carrying value of long-term assets | $ | $ 0.0 |  |
Number of years of average prices for copper and molybdenum used for impairment analysis | 3 years |  |
Number of reportable segments | segment | 3 |  |
Copper concentrates |  |  |
Significant Accounting Policies |  |  |
Long-term contracts with promises to deliver mineral | 208,000 |  |
Copper cathodes |  |  |
Significant Accounting Policies |  |  |
Long-term contracts with promises to deliver mineral | 48,000 |  |
Molybdenum concentrates |  |  |
Significant Accounting Policies |  |  |
Long-term contracts with promises to deliver mineral | 43,329 |  |
Sulfuric acid |  |  |
Significant Accounting Policies |  |  |
Long-term contracts with promises to deliver mineral | 325,700 |  |
Minimum |  |  |
Financial information related to segments |  |  |
Estimated useful lives of buildings and equipment | 2 years |  |
Significant Accounting Policies |  |  |
Percentage of metal production sold under annual or longer-term contracts | 80.00% |  |
Maximum |  |  |
Financial information related to segments |  |  |
Maximum period after shipping within which pricing is based by customer contracts in most cases | 3 months |  |
Estimated useful lives of buildings and equipment | 50 years |  |
Significant Accounting Policies |  |  |
Percentage of metal production sold under annual or longer-term contracts | 90.00% |  |
Peruvian Operations |  |  |
Financial information related to segments |  |  |
Number of open-pit copper mines | item | 2 |  |
Mexican IMMSA Unit |  |  |
Financial information related to segments |  |  |
Number of underground poly metal mines | item | 5 |  |

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