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Mineral Properties - Capitalized Investment in Mineral Properties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Exploration		$ 40
Lik Project (Alaska)
Exploration	$ 15,611	0
La Promesa (Peru)
Exploration	6	6
Montana Royalty Property
Exploration	$ 40	$ 40

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