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INTANGIBLE ASSETS: (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | $ 211.3 | $ 206.4 |
Accumulated amortization | (118.5) | (110.2) |
Goodwill | 41.9 | 41.9 |
Intangible assets, net | 134.7 | 138.1 |
Amortization expense: |  |  |
Amortization expense | 7.3 | 8.7 | $ 9.2
Estimated amortization expense: |  |  |
2023 | 6.9 |  |
2024 | 5.8 |  |
2025 | 5.1 |  |
2026 | 1.8 |  |
2027 | 1.8 |  |
Total 2023 - 2027 | 21.4 |  |
Average annual | 4.3 |  |
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 | (42.2) | (40.4) |
Mine engineering and development studies |  |  |
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | 19.8 | 19.8 |
Accumulated amortization | (19.2) | (18.2) |
Software |  |  |
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | 70.3 | 65.4 |
Accumulated amortization | $ (57.1) | $ (51.6) |

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