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INCOME AND MINING TAXES - Non Operating Losses (Details) $ in Thousands	Dec. 31, 2017 USD ($)
United States
Income Taxes
Non operating losses	$ 165,654
Mexico
Income Taxes
Non operating losses	33,355
Canada
Income Taxes
Non operating losses	29,906
Argentina
Income Taxes
Non operating losses	$ 78,964

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Amount of non operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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