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INTANGIBLE ASSETS: (Tables)

12 Months Ended

Dec. 31, 2019

INTANGIBLE ASSETS:

Schedule of major classes of intangible assets and goodwill

​

​	​	​	​	​	​	​
​	​	At December 31,
(in millions)		2019			2018
Mining concessions	​	$	121.2	​	$	121.2
Mine engineering and development studies	​		19.8	​		19.8
Software	​		55.9	​		49.6
​	​		196.9	​		190.6
Accumulated amortization:	​		​	​	​	​
Mining concessions	​	​	(38.0)	​	​	(37.4)
Mine engineering and development studies	​	​	(16.3)	​	​	(15.3)
Software	​	​	(36.1)	​	​	(32.1)
​	​	​	(90.4)	​	​	(84.8)
Goodwill	​		41.9	​		41.9
Intangible assets, net	​	$	148.4	​	$	147.7

Schedule of estimated amortization of intangible assets for future periods

​

​	​	​	​
Estimated amortization expense (in millions):		​	​
2020	​	$	9.6
2021	​	​	5.5
2022	​	​	5.6
2023	​	​	5.5
2024	​	​	4.3
Total 2020 - 2024	​	$	30.5
Average annual	​	$	6.1

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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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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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-Name Accounting Standards Codification
-Topic 350
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