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SHARE CAPITAL AND RESERVES (Summary of the Company's Options and the Changes for the Year) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 CAD ($) shares | Dec. 31, 2016 CAD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
End of period, options | 7,726,317 |
Stock Option Incentive Plan [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning of period, options | 6,235,180 | 6,855,582
Granted, options | 795,000 | 1,336,000
Mariana Resources Ltd. replacement options | 2,078,248 |
Exercised, options | (797,128) | (1,516,402)
Expired unexercised, options | (584,983) | (440,000)
End of period, options | 7,726,317 | 6,235,180
Beginning of period, options, weighted average exercise price | $ | $ 4.71 | $ 5.45
Granted, options, weighted average exercise price | $ | 5.50 | 4.96
Mariana Resources Ltd. replacement options, weighted average exercise price | $ | 3.41 |
Exercised, options, weighted average exercise price | $ | (3.23) | (4.63)
Expired unexercised, options, weighted average exercise price | $ | (15.29) | (6.35)
End of period, options, weighted average exercise price | $ | $ 3.79 | $ 4.71

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