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CAPITAL AND FINANCIAL RISK MANAGEMENT - Market Risk management (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Interest Rate Risk
CAPITAL AND FINANCIAL RISK MANAGEMENT
Change in rate (as a percentage)	1.00%
Impact on income before income and mining taxes and equity assumptions of sensitivity analysis	$ 0	$ 2,600
Foreign Currency Risk
CAPITAL AND FINANCIAL RISK MANAGEMENT
Change in rate (as a percentage)	10.00%
10.0% strengthening in U.S. Dollar | Canadian dollar
CAPITAL AND FINANCIAL RISK MANAGEMENT
Impact on income before income and mining taxes and equity assumptions of sensitivity analysis	$ 8,435
10.0% strengthening in U.S. Dollar | Euro
CAPITAL AND FINANCIAL RISK MANAGEMENT
Impact on income before income and mining taxes and equity assumptions of sensitivity analysis	2,477
10.0% strengthening in U.S. Dollar | Mexican peso
CAPITAL AND FINANCIAL RISK MANAGEMENT
Impact on income before income and mining taxes and equity assumptions of sensitivity analysis	(6,710)
10.0% weakening in U.S. Dollar | Canadian dollar
CAPITAL AND FINANCIAL RISK MANAGEMENT
Impact on income before income and mining taxes and equity assumptions of sensitivity analysis	(8,435)
10.0% weakening in U.S. Dollar | Euro
CAPITAL AND FINANCIAL RISK MANAGEMENT
Impact on income before income and mining taxes and equity assumptions of sensitivity analysis	(2,477)
10.0% weakening in U.S. Dollar | Mexican peso
CAPITAL AND FINANCIAL RISK MANAGEMENT
Impact on income before income and mining taxes and equity assumptions of sensitivity analysis	$ 6,710

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- Definition

The percentage in exchange rates used to assess the sensitivity of income before income and mining taxes and equity.

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The monetary upward or downward change in the relevant risk variable percentage used for sensitivity analysis of types of risk to which the entity is exposed. Used to calculate how profit or loss would have been affected by changes in the relevant risk variable that were reasonably possible as of the reporting date.

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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