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Long-term investments | 12 Months Ended
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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.

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- Definition The disclosure of financial assets classified as available for sale. [Refer: Financial assets available-for-sale] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_10_e&doctype=Standard -URIDate 2017-03-09 + Details
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