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INTANGIBLE ASSETS: - Other (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Intangible assets
Intangible assets excluding goodwill, gross	$ 185.8	$ 171.8
Accumulated amortization	(73.5)	(58.1)
Goodwill	41.9	41.4
Intangible assets, net	154.2	155.1
Amortization expense:
Amortization expense	8.0	7.1	$ 4.9
Estimated amortization expense:
2017	6.2
2018	5.9
2019	5.7
2020	5.9
2021	4.3
Total 2017-2021	28.0
Average annual	5.6
Mining concessions
Intangible assets
Intangible assets excluding goodwill, gross	121.2	121.2
Accumulated amortization	(35.6)	(34.8)
Mine engineering and development studies
Intangible assets
Intangible assets excluding goodwill, gross	19.8	6.0
Accumulated amortization	(14.8)	(5.6)
Software
Intangible assets
Intangible assets excluding goodwill, gross	44.8	44.6
Accumulated amortization	$ (23.1)	$ (17.7)

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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