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FAIR VALUE MEASUREMENTS | 6 Months Ended
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Jun. 30, 2019
Fair Value Measurements [Abstract] |
Disclosure of fair value measurement [text block] | FAIR VALUE MEASUREMENTS A) Assets and Liabilities Measured at Fair Value on a Recurring Basis
As at June 30, 2019 | Quoted prices in active markets for identical assets |  | Significant other observable inputs |  | Significant unobservable inputs |  | Aggregate fair value |
(Level 1) |  | (Level 2) |  | (Level 3) |  |
Cash and equivalents |  | $2,153 |  |  | $— |  |  | $— |  |  | $2,153 |
Other investments | 221 |  | — |  | — |  | 221 |
Derivatives | — |  | 2 |  | — |  | 2 |
Receivables from provisional copper and gold sales | — |  | 45 |  | — |  | 45 |
|  | $2,374 |  |  | $47 |  |  | $— |  |  | $2,421 |
B) Fair Values of Financial Assets and Liabilities
| As at June 30, 2019 |  | As at December 31, 2018 |
| Carrying amount |  | Estimated fair value |  | Carrying amount |  | Estimated fair value |
Financial assets |  |  |  |
Other assets 1 |  | $524 |  |  | $524 |  |  | $559 |  |  | $559 |
Other investments 2 | 221 |  | 221 |  | 209 |  | 209 |
Derivative assets | 2 |  | 2 |  | 3 |  | 3 |
|  | $747 |  |  | $747 |  |  | $771 |  |  | $771 |
Financial liabilities |  |  |  |
Debt 3 |  | $5,807 |  |  | $6,925 |  |  | $5,738 |  |  | $6,183 |
Derivative liabilities | — |  | — |  | 3 |  | 3 |
Other liabilities | 519 |  | 519 |  | 297 |  | 297 |
|  | $6,326 |  |  | $7,444 |  |  | $6,038 |  |  | $6,483 |
1 | Includes restricted cash and amounts due from our partners.
2 | Recorded at fair value. Quoted market prices are used to determine fair value.
3 | Debt is generally recorded at amortized cost. The fair value of debt is primarily determined using quoted market prices. Balance includes both current and long-term portions of debt.
We do not offset financial assets with financial liabilities. The Company’s valuation techniques were presented in Note 26 of the 2018 Annual Financial Statements and have been consistently applied in these interim financial statements.

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- Definition Fair Value Measurements [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2018-03-16 + Details
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