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Mineral Properties - Mineral Properties - Investment in Mineral Property (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
La Promesa (Peru)
Exploration	$ 5	$ 5
Norcan (Mexico)
Exploration	6	6
Aconchi (Mexico)
Exploration	5	5
Canta Colorado (Peru)
Exploration	$ 3	$ 3

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