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INTANGIBLE ASSETS: (Tables)

12 Months Ended

Dec. 31, 2022

INTANGIBLE ASSETS:

Schedule of major classes of intangible assets and goodwill

​

​	​	​	​	​	​	​
​	​	At December 31,
(in millions)		2022			2021
Mining concessions	​	$	121.2	​	$	121.2
Mine engineering and development studies	​		19.8	​		19.8
Software	​		70.3	​		65.4
​	​		211.3	​		206.4
Accumulated amortization:	​		​	​	​	​
Mining concessions	​	​	(42.2)	​	​	(40.4)
Mine engineering and development studies	​	​	(19.2)	​	​	(18.2)
Software	​	​	(57.1)	​	​	(51.6)
​	​	​	(118.5)	​	​	(110.2)
Goodwill	​		41.9	​		41.9
Intangible assets, net	​	$	134.7	​	$	138.1

​

Schedule of estimated amortization of intangible assets for future periods

​

​	​	​	​
Estimated amortization expense (in millions):		​	​
2023	​	$	6.9
2024	​	​	5.8
2025	​	​	5.1
2026	​	​	1.8
2027	​	​	1.8
Total 2023 - 2027	​	$	21.4
Average annual	​	$	4.3

​

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- Definition

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
-Topic 350
-SubTopic 20
-Section 50
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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
-SubTopic 30
-Section 50
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