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Mineral Property - Capitalized Investment in Mineral Properties (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Lik Project (Alaska)
Exploration	$ 15,611	$ 15,611
La Promesa (Peru)
Exploration	6	6
Montana Royalty Property
Exploration	40	40
Total Exploration Mineral Property
Exploration	$ 15,657	$ 15,657

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