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v3.20.4

INTANGIBLE ASSETS: (Tables) | 12 Months Ended
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Dec. 31, 2020
INTANGIBLE ASSETS: |
Schedule of major classes of intangible assets and goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31,
(in millions) |  | 2020 |  | 2019
Mining concessions | ​ | $ | 121.2 | ​ | $ | 121.2
Mine engineering and development studies | ​ |  | 19.8 | ​ |  | 19.8
Software | ​ |  | 60.6 | ​ |  | 55.9
​ | ​ |  | 201.6 | ​ |  | 196.9
Accumulated amortization: | ​ |  | ​ | ​ | ​ | ​
Mining concessions | ​ | ​ | (38.6) | ​ | ​ | (38.0)
Mine engineering and development studies | ​ | ​ | (17.2) | ​ | ​ | (16.3)
Software | ​ | ​ | (44.7) | ​ | ​ | (36.1)
​ | ​ | ​ | (100.5) | ​ | ​ | (90.4)
Goodwill | ​ |  | 41.9 | ​ |  | 41.9
Intangible assets, net | ​ | $ | 143.0 | ​ | $ | 148.4
Schedule of estimated amortization of intangible assets for future periods | ​
​ | ​ | ​ | ​
Estimated amortization expense (in millions): |  | ​ | ​
2021 | ​ | $ | 7.7
2022 | ​ | ​ | 5.2
2023 | ​ | ​ | 5.2
2024 | ​ | ​ | 4.3
2025 | ​ | ​ | 3.0
Total 2021 - 2025 | ​ | $ | 25.4
Average annual | ​ | $ | 5.1

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