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DESCRIPTION OF THE BUSINESS: (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 15, 2020 USD ($) | Dec. 31, 2020 $ / lb $ / item
Percentage of ownership interest held by the parent company |  | 88.90%
Percentage of operating over production capacity during COVID-19 time |  | 0.98%
Copper price assumption | $ / lb |  | 2.00
Molybdenum price assumption | $ / item |  | 4.00
Minimum |  |
Projected discounted cash flows in excess of the carrying amounts of long lived assets by margins |  | 1.3
Maximum |  |
Projected discounted cash flows in excess of the carrying amounts of long lived assets by margins |  | 4.3
Fixed-rate senior unsecured notes issued April 2010 |  |
Repayment of debt | $ | $ 400 |

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