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FINANCIAL RISK MANAGEMENT (Details 5) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Gold price |  |
Financial risk management [Line Items] |  |
Impact on net earnings due to 10 % change in price | $ 37.6 | $ 52.5
Impact on other comprehensive income due to 10 % change in price | 0.0 | 0.0
Copper price |  |
Financial risk management [Line Items] |  |
Impact on net earnings due to 10 % change in price | 6.5 | 9.0
Impact on other comprehensive income due to 10 % change in price | 0.0 | 0.0
Fuel and electricity price |  |
Financial risk management [Line Items] |  |
Impact on net earnings due to 10 % change in price | 5.5 | 4.6
Impact on other comprehensive income due to 10 % change in price | $ 0.0 | $ 0.3

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