FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Narrative) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) oz	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Statements Line Items
Percentage of receivables comprised of IVA and tax receivables in Mexico	99.00%	98.00%
Percentage of receivables pending finalizations of concentrate sales	1.00%
Impairment loss recognised in profit or loss, trade receivables	$ 194	$ 2,212
Cash and cash equivalents	$ 33,376	38,277	$ 72,317
Confidence level used to determine risk adjustment	10.00%
Value at risk	$ 904
Foreign Currency Risk [Member] \| Canadian Dollar [Member]
Statements Line Items
Cash and cash equivalents	$ 26	441
Confidence level used to determine risk adjustment	5.00%
Value at risk	$ 97
Foreign Currency Risk [Member] \| Mexican Peso [Member]
Statements Line Items
Cash and cash equivalents	$ 4,522	$ 3,192
Confidence level used to determine risk adjustment	5.00%
Value at risk	$ 547
Commodity Price Risk [Member]
Statements Line Items
Confidence level used to determine risk adjustment	10.00%
Value at risk	$ 900
Ounces of silver without a final settlement price \| oz	274,033
Ounces of gold without a final settlement price \| oz	3,770

Ounces of gold without a final settlement price

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Ounces of silver without a final settlement price

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Percentage of receivables comprised of IVA and tax receivables in Mexico

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Percentage of receivables pending finalizations of concentrate sales

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Statement [Line Items]

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The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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The confidence level used to determine the risk adjustment for non-financial risk. [Refer: Risk adjustment for non-financial risk [member]]

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The amount of impairment loss recognised in profit or loss for trade receivables. [Refer: Impairment loss recognised in profit or loss; Trade receivables]

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The measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon.

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