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INTANGIBLE ASSETS: (Tables)

12 Months Ended

Dec. 31, 2018

INTANGIBLE ASSETS:

Schedule of major classes of intangible assets and goodwill

		At December 31,
(in millions)		2018			2017
Mining concessions		$	121.2		$	121.2
Mine engineering and development studies			19.8			19.8
Software			49.6			49.0
			190.6			190.0
Accumulated amortization:
Mining concessions			(37.4)			(36.6)
Mine engineering and development studies			(15.3)			(15.3)
Software			(32.1)			(27.5)
			(84.8)			(79.4)
Goodwill			41.9			41.9
Intangible assets, net		$	147.7		$	152.5

Schedule of estimated amortization of intangible assets for future periods

Estimated amortization expense (in millions):
2019		$	4.7
2020			5.0
2021			5.1
2022			5.0
2023			5.0
Total 2019 - 2023		$	24.8
Average annual		$	5.0

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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
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