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Long-term investments
 12 Months Ended
Dec. 31, 2018
Available-for-sale financial assets [abstract]  
Long-term investments
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



The Company holds investments in certain public companies, as disclosed in the table above. The Company, through its acquisition of CGA Mining Limited in 2013, acquired investments in the securities of St. Augustine Gold & Copper Ltd. and RTG Mining Inc.

The Company's long-term investments were previously classified as available-for-sale under IAS 39. Upon adoption of IFRS 9 (see Note 3), the Company made the irrevocable election to present changes in the fair value of these long-term investments in OCI. This designation resulted in reclassification of a $35 million cumulative impairment loss (net of a $1 million deferred income tax recovery) on the long-term investments from deficit to AOCI on January 1, 2018. For the year ended December 31, 2018, the Company recorded an unrealized fair value loss of $6 million in other comprehensive income, compared to an unrealized fair value gain of $1 million for the year ended December 31, 2017.