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v3.20.4

INTANGIBLE ASSETS: (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | $ 201.6 | $ 196.9 |
Accumulated amortization | (100.5) | (90.4) |
Goodwill | 41.9 | 41.9 |
Intangible assets, net | 143.0 | 148.4 |
Amortization expense: |  |  |
Amortization expense | 9.2 | 4.5 | $ 5.4
Estimated amortization expense: |  |  |
2021 | 7.7 |  |
2022 | 5.2 |  |
2023 | 5.2 |  |
2024 | 4.3 |  |
2025 | 3.0 |  |
Total 2021-2025 | 25.4 |  |
Average annual | 5.1 |  |
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 | (38.6) | (38.0) |
Mine engineering and development studies |  |  |
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | 19.8 | 19.8 |
Accumulated amortization | (17.2) | (16.3) |
Software |  |  |
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | 60.6 | 55.9 |
Accumulated amortization | $ (44.7) | $ (36.1) |

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