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DERIVATIVE INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative instruments [Line Items] |
Detailed information about derivative assets and derivative liabilities [text block] |
| As at December 31 | As at December 31
(in millions of U.S. dollars) | 2018 | 2017
DERIVATIVE ASSETS |  |
Copper price option contracts (1) | 0.7 | -
Total derivative assets | 0.7 | -
DERIVATIVE LIABILITIES |  |
Unsettled provisionally priced concentrate derivatives, and swap contracts (2) | 0.7 | 1.9
Copper price option contracts (1) | - | 4.1
Gold price option contracts (1) | 4.8 | -
Total derivative liabilities | 5.5 | 6.0
| 1. | As at December 31, 2018, copper price option contracts are included within prepaids and other in the statement of financial position and gold price option contracts are included within trade and other payables in the statement of financial position. As at December 31, 2017, copper price option contracts are included within trade and other payables in the statement of financial position.
| 2. | Unsettled provisionally priced concentrate derivatives are included within trade and other receivables in the statement of financial position.
Detailed information about the realised and unrealised gainlosses on provisionally priced sales [text block] | The following tables summarize the realized and unrealized gains (losses) on provisionally priced sales:
| Year ended December 31, 2018
(in millions of U.S. dollars) | Gold | Copper | Total
(LOSS) GAIN ON THE PROVISIONAL PRICING OF CONCENTRATE SALES |  |  |
Realized | (1.2) | (7.7) | (8.9)
Unrealized | 1.1 | (2.7) | (1.6)
Total loss | (0.1) | (10.4) | (10.5)
| Year ended December 31, 2017
(in millions of U.S. dollars) | Gold | Copper | Total
GAIN ON THE PROVISIONAL PRICING OF CONCENTRATE SALES |  |  |
Realized | 1.9 | 10.0 | 11.9
Unrealized | 0.1 | 4.1 | 4.2
Total gain | 2.0 | 14.1 | 16.1
Detailed information about the realised and unrealised gainlosses on gold and copper swap contracts [text block] | The following tables summarize the realized and unrealized gains (losses) on gold and copper swap contracts:
| Year ended December 31, 2018
(in millions of U.S. dollars) | Gold | Copper | Total
GAIN (LOSS) ON SWAP CONTRACTS |  |  |
Realized | 1.3 | 11.3 | 12.6
Unrealized | (0.8) | 1.7 | 0.9
Total gain | 0.5 | 13.0 | 13.5
| Year ended December 31, 2017
(in millions of U.S. dollars) | Gold | Copper | Total
GAIN (LOSS) ON SWAP CONTRACTS |  |  |
Realized | (2.0) | (16.8) | (18.8)
Unrealized | (0.3) | (5.8) | (6.1)
Total gain (loss) | (2.3) | (22.6) | (24.9)
Copper [Member] |
Derivative instruments [Line Items] |
Detailed information about the remaining contracts of metal option [Text Block] |
| Quantity outstanding | Remaining term | Exercise price ($/lb) | Fair value - asset (liability) (1)
COPPER PRICE OPTION CONTRACTS OUTSTANDING |  |  |  |
Copper call contracts - sold | 21,600 tonnes | January – December 2019 | 3.00 | (2.3)
Copper put contracts - purchased | 21,600 tonnes | January – December 2019 | 2.50 | 3.0
| 1. | The Company presents the fair value of its put and call options on a net basis on the consolidated statements of financial position. The Company has a legally enforceable right to set off the amounts under its option contracts and intends to settle on a net basis.
Gold [Member] |
Derivative instruments [Line Items] |
Detailed information about the remaining contracts of metal option [Text Block] |
| Quantity outstanding | Remaining term | Exercise price ($/lb) | Fair value - asset (liability) (1)
GOLD PRICE OPTION CONTRACTS OUTSTANDING |  |  |  |
Gold call contracts - sold | 192,000 oz | January – December 2019 | 1,300 | (8.0)
Gold put contracts - purchased | 192,000 oz | January – December 2019 | 1,230 | 3.2
| 1. | The Company presents the fair value of its put and call options on a net basis on the consolidated statements of financial position. The Company has a legally enforceable right to set off the amounts under its option contracts and intends to settle on a net basis.

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