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INTANGIBLE ASSETS: (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | $ 196.9 | $ 190.6 |
Accumulated amortization | (90.4) | (84.8) |
Goodwill | 41.9 | 41.9 |
Intangible assets, net | 148.4 | 147.7 |
Amortization expense: |  |  |
Amortization expense | 4.5 | 5.4 | $ 5.9
Estimated amortization expense: |  |  |
2020 | 9.6 |  |
2021 | 5.5 |  |
2022 | 5.6 |  |
2023 | 5.5 |  |
2024 | 4.3 |  |
Total 2020-2024 | 30.5 |  |
Average annual | 6.1 |  |
Buenavista del Cobre, S.A. de C.V |  |  |
Intangible assets |  |  |
Goodwill | 17.0 |  |
El Pilar |  |  |
Intangible assets |  |  |
Goodwill | 24.9 |  |
Mining concessions |  |  |
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | 121.2 | 121.2 |
Accumulated amortization | (38.0) | (37.4) |
Mine engineering and development studies |  |  |
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | 19.8 | 19.8 |
Accumulated amortization | (16.3) | (15.3) |
Software |  |  |
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | 55.9 | 49.6 |
Accumulated amortization | $ (36.1) | $ (32.1) |

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