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INTANGIBLE ASSETS: (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | $ 215.3 | $ 211.3 |
Accumulated amortization | (127.0) | (118.5) |
Goodwill | 41.9 | 41.9 |
Intangible assets, net | 130.2 | 134.7 |
Amortization expense: |  |  |
Amortization expense | 7.9 | 7.3 | $ 8.7
Estimated amortization expense: |  |  |
2024 | 6.3 |  |
2025 | 6.0 |  |
2026 | 2.1 |  |
2027 | 2.1 |  |
2028 | 2.0 |  |
Total 2024 - 2028 | 18.5 |  |
Average annual | 3.7 |  |
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 | (44.2) | (42.2) |
Mine engineering and development studies |  |  |
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | 19.8 | 19.8 |
Accumulated amortization | (19.8) | (19.2) |
Software |  |  |
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | 74.3 | 70.3 |
Accumulated amortization | $ (63.0) | $ (57.1) |

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