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DERIVATIVE INSTRUMENTS (Details 6) - Gold [Member] | 12 Months Ended
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Dec. 31, 2018 USD ($) oz
Disclosure of derivative instruments [Line Items] |  |
Gold Call Contracts Sold Quantity Outstanding | 192,000 |
Gold Call Contracts Purchased Quantity Outstanding | 192,000 |
Gold Call Contracts Sold Remaining Contractual term | 2019 years |
Gold Call Contracts Purchased Remaining Contractual term | 2019 years |
Gold Call Contracts Sold Exercise Price | 1,300 |
Gold Call Contracts Purchased Exercise Price | 1,230 |
Gold Call Contracts Sold Fair Value Assets Liability | $ | $ (8.0) | [1]
Gold Call Contracts Purchased Fair Value Assets Liability | $ | $ 3.2 | [1]
[1] | The Company presents the fair value of its put and call options on a net basis on the consolidated statements of financial position. The Company has a legally enforceable right to set off the amounts under its option contracts and intends to settle on a net basis.

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