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SHARE CAPITAL AND SHARE-BASED PAYMENTS (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-Based Payment Arrangements [Abstract] |
Disclosure of number and weighted average exercise prices of share options | The changes in stock options issued during the years ended December 31, 2018 and December 31, 2017 are as follows:
| 2018 | 2017
| Number of stock options |  | Weighted average exercise price (C$/option) |  | Number of stock options |  | Weighted average exercise price (C$/option) |
Outstanding, beginning of year | 2,976,360 |  | 9.35 |  | 3,038,707 |  | 8.52 |
Granted | 668,664 |  | 11.84 |  | 489,305 |  | 12.50 |
Exercised | (899,050 | ) | (7.79 | ) | (440,317 | ) | (6.60 | )
Expired | (56,700 | ) | (14.15 | ) | — |  | — |
Forfeited | (50,525 | ) | (12.70 | ) | (111,335 | ) | (11.25 | )
Outstanding, end of year | 2,638,749 |  | 10.35 |  | 2,976,360 |  | 9.35 |
Disclosure of indirect measurement of fair value of goods or services received, share options granted during period | The weighted average fair value of stock options granted during the year ended December 31, 2018 and year ended December 31, 2017 were estimated to be C$5.06 and C$5.97 per stock option, respectively, at the grant date using the Black-Scholes option pricing model, based on the following assumptions:
Years ended December 31 | 2018 | 2017
Forfeiture rate (%) | 3.0 | 3.0
Dividend yield (%) | — | —
Average risk-free interest rate (%) | 1.88 | 1.00
Expected life (years) | 4.2 | 4.2
Volatility (%) | 55.8 | 60.9
Disclosure of range of exercise prices of outstanding share options | The following table summarizes information about stock options outstanding and exercisable at December 31, 2018:
| Stock options outstanding |  | Stock options exercisable |
Exercise prices (C$) | Stock options outstanding |  | Weighted average remaining contractual life (years) |  | Stock options exercisable |  | Weighted average exercise price (C$/option) |
3.30 - 7.02 | 321,592 |  | 2.5 |  | 321,592 |  | 5.83 |
7.03 - 7.36 | 630,045 |  | 3.4 |  | 401,717 |  | 7.19 |
7.37 - 11.95 | 700,836 |  | 4.3 |  | 324,536 |  | 9.05 |
11.96 - 24.41 | 986,276 |  | 3.7 |  | 443,859 |  | 15.56 |
| 2,638,749 |  | 3.6 |  | 1,491,704 |  | 9.79 |
Disclosure of number and weighted average exercise prices of other equity instruments |
Years ended December 31 | 2018 |  | 2017 |
| Number of DSUs |  | Number of DSUs |
Outstanding, beginning of year | 608,763 |  | 535,579 |
Granted | 107,318 |  | 73,184 |
Redeemed | (182,383 | ) | — |
Outstanding, end of year | 533,698 |  | 608,763 |
Years ended December 31 | 2018 |  | 2017 |
| Number of PSUs |  | Number of PSUs |
Outstanding, beginning of year | 391,432 |  | 524,550 |
Granted | 174,900 |  | 159,850 |
Settled | (255,232 | ) | (190,000 | )
Forfeited | — |  | (102,968 | )
Outstanding, end of year | 311,100 |  | 391,432 |
Years ended December 31 | 2018 |  | 2017 |
| Number of RSUs |  | Number of RSUs |
Outstanding, beginning of year | 541,006 |  | 704,055 |
Granted | 322,935 |  | 242,565 |
Settled | (276,983 | ) | (313,003 | )
Forfeited | (161,863 | ) | (92,611 | )
Outstanding, end of year | 425,095 |  | 541,006 |
Explanation of effect of share-based payments on entity's profit or loss [text block] | Total share-based compensation, including all equity and cash-settled arrangements, for the years ended December 31, 2018 and 2017 has been recognized in the consolidated financial statements as follows:
Years ended December 31 | 2018 |  | 2017 |
| $ |  | $ |
Equity-settled |  |
Cost of inventory | 160 |  | 190 |
General and administrative expense | 1,958 |  | 1,988 |
Exploration, evaluation and reclamation expenses | 39 |  | 41 |
Cash-settled |  |
Cost of inventory | 1,024 |  | 1,639 |
General and administrative expense | 11,412 |  | 2,237 |
Exploration, evaluation and reclamation expenses | 125 |  | — |
Total | 14,718 |  | 6,095 |

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- Definition The disclosure of information about indirect, by reference to the fair value of the equity instruments granted, measurement of the fair value of goods or services received as consideration for the entity's share options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The disclosure of the number and weighted average exercise prices of other equity instruments (ie other than share options). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The disclosure of the number and weighted average exercise prices of share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The disclosure of the range of exercise prices for outstanding share options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The explanation that enables users of financial statements to understand the effect of share-based payment transactions on the entity's profit (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 50 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_50&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Share-Based Payment Arrangements [Abstract] + References No definition available. + Details
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