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DESCRIPTION OF THE BUSINESS: (Details) $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
Apr. 16, 2020 USD ($) | Apr. 15, 2020 USD ($) | Mar. 31, 2020 employee $ / lb $ / item
Percentage of ownership interest held by the parent company |  |  | 88.90%
Percentage of operating over production capacity during COVID-19 time |  |  | 90.00%
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 |  |  | 1.2
Maximum |  |  |
Projected discounted cash flows in excess of the carrying amounts of long lived assets by margins |  |  | 4.8
Peru |  |  |
Number of employees working on site under strict safety measures |  |  | 3,499
Percentage workforce working on site under strict safety measures |  |  | 39.00%
Number of employees working from home |  |  | 5,468
Mexico |  |  |
Number of employees working on site under strict safety measures |  |  | 6,333
Percentage workforce working on site under strict safety measures |  |  | 40.00%
Number of employees working from home |  |  | 8,751
Subsequent Events | Fixed-rate senior unsecured notes issued April 2010 |  |  |
Repayment of debt | $ | $ 410.8 | $ 400.0 |

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