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v3.19.1

DERIVATIVE INSTRUMENTS (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 $ / Ounce-oz | Oct. 31, 2017 lb
Disclosure of derivative instruments [Line Items] |  |
Strike price of put options at the time of purchasing | $ / Ounce-oz | 1,230 |
Strike price of call options at the time of selling | $ / Ounce-oz | 1,300 |
Purchased put options [Member] |  |
Disclosure of derivative instruments [Line Items] |  |
Strike price of copper price option contracts | lb |  | 3.00
Written call options [Member] |  |
Disclosure of derivative instruments [Line Items] |  |
Strike price of copper price option contracts | lb |  | 3.37

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