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SHARE CAPITAL AND SHARE-BASED PAYMENTS (Tables)
 12 Months Ended
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