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Mineral Properties - Mineral Properties - Investment in Mineral Property (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
La Promesa (Peru)
Exploration	$ 6	$ 6
Montana Royalty Property
Exploration	40
Canta Colorado (Peru)
Exploration		3
Norcan (Mexico)
Exploration		5
Aconchi (Mexico)
Exploration		$ 5

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