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Long-term investments (Tables)
 12 Months Ended
Dec. 31, 2018
Available-for-sale financial assets [abstract]  
Schedule of Long-Term Investments
 
2018
 
2017
 
Cost

AOCI

Fair Value

 
Cost

Total Impairment

AOCI

Fair Value

 
$

$

$

 
$

$

$

$

 
 
 
 
 
 
 
 
 
Calibre Mining Corp.
7,844

(6,395
)
1,449

 
7,844

(4,330
)
2,012

5,526

RTG Mining Inc.
13,400

(12,306
)
1,094

 
13,400

(12,095
)
1,283

2,588

St. Augustine Gold & Copper Ltd.
20,193

(19,194
)
999

 
20,193

(18,658
)
91

1,626

Libero Copper Corp. (Note 8)
632

(22
)
610

 
—

—

—

—

Goldstone Resources Ltd.
20

(17
)
3

 
20

(18
)
2

4

Balance, end of year
42,089

(37,934
)
4,155

 
41,457

(35,101
)
3,388

9,744