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Sales (Schedule of Sales by Product and Geographical Area) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of geographical areas [line items]
Revenue	$ 268,111	$ 210,255
Silver Gold Concentrates [member]
Disclosure of geographical areas [line items]
Revenue	179,996	143,151
Silver Lead Concentrates [member]
Disclosure of geographical areas [line items]
Revenue	42,202	40,442
Zinc Concentrates [member]
Disclosure of geographical areas [line items]
Revenue	45,913	26,662
CANADA
Disclosure of geographical areas [line items]
Revenue
CANADA | Silver Gold Concentrates [member]
Disclosure of geographical areas [line items]
Revenue
CANADA | Silver Lead Concentrates [member]
Disclosure of geographical areas [line items]
Revenue
CANADA | Zinc Concentrates [member]
Disclosure of geographical areas [line items]
Revenue
PERU
Disclosure of geographical areas [line items]
Revenue	88,115	67,104
PERU | Silver Lead Concentrates [member]
Disclosure of geographical areas [line items]
Revenue	42,202	40,442
PERU | Zinc Concentrates [member]
Disclosure of geographical areas [line items]
Revenue	45,913	26,662
MEXICO
Disclosure of geographical areas [line items]
Revenue	179,996	143,151
MEXICO | Silver Gold Concentrates [member]
Disclosure of geographical areas [line items]
Revenue	179,996	143,151
ARGENTINA
Disclosure of geographical areas [line items]
Revenue
ARGENTINA | Silver Gold Concentrates [member]
Disclosure of geographical areas [line items]
Revenue
ARGENTINA | Silver Lead Concentrates [member]
Disclosure of geographical areas [line items]
Revenue
ARGENTINA | Zinc Concentrates [member]
Disclosure of geographical areas [line items]
Revenue

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The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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