Segmented Information - Company's Metal Revenues from Operations (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Products And Services [Abstract]
Gold	$ 103,838	$ 104,510
Silver by-product	689	652
Metal revenues	$ 104,527	$ 105,162

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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+ Details