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Mineral Property - Capitalized Investment in Mineral Property (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Lik Project (Alaska-US)
Exploration	$ 15,611	$ 15,611
La Promesa (Peru)
Exploration	6	6
Montana Royalty Property (US)
Exploration	$ 40	$ 40

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