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INTANGIBLE ASSETS: (Tables)

12 Months Ended

Dec. 31, 2021

INTANGIBLE ASSETS:

Schedule of major classes of intangible assets and goodwill

​

​	​	​	​	​	​	​
​	​	At December 31,
(in millions)		2021			2020
Mining concessions	​	$	121.2	​	$	121.2
Mine engineering and development studies	​		19.8	​		19.8
Software	​		65.4	​		60.6
​	​		206.4	​		201.6
Accumulated amortization:	​		​	​	​	​
Mining concessions	​	​	(40.4)	​	​	(38.6)
Mine engineering and development studies	​	​	(18.2)	​	​	(17.2)
Software	​	​	(51.6)	​	​	(44.7)
​	​	​	(110.2)	​	​	(100.5)
Goodwill	​		41.9	​		41.9
Intangible assets, net	​	$	138.1	​	$	143.0

Schedule of estimated amortization of intangible assets for future periods

​

​	​	​	​
Estimated amortization expense (in millions):		​	​
2022	​	$	6.4
2023	​	​	5.4
2024	​	​	4.3
2025	​	​	3.2
2026	​	​	1.7
Total 2022 - 2026	​	$	21.0
Average annual	​	$	4.2

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Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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