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v3.19.1

PROPERTY, PLANT AND EQUIPMENT (Tables) | 12 Months Ended
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Dec. 31, 2018
Property, plant and equipment [abstract] |
Disclosure of detailed information about property, plant and equipment |
| December 31, 2018
| Plant and equipment (1) |  | Mineral properties subject to depletion (3) |  | Mineral properties not yet subject to depletion (2)(3)(5) |  | Exploration and evaluation assets |  | Total |
| $ |  | $ |  | $ |  | $ |  | $ |
Cost |  |  |  |  |
Balance, beginning of year | 545,090 |  | 393,273 |  | 121,854 |  | 91,579 |  | 1,151,796 |
Additions | 102,275 |  | 33,371 |  | 13,771 |  | 956 |  | 150,373 |
Disposals | (15,485 | ) | — |  | — |  | (1,307 | ) | (16,792 | )
Costs written off | (9,998 | ) | — |  | — |  | — |  | (9,998 | )
Change in estimate of close down and restoration provision | — |  | 3,269 |  | — |  | — |  | 3,269 |
Transfers | — |  | 33,635 |  | (33,635 | ) | — |  | — |
Balance, end of year | 621,882 |  | 463,548 |  | 101,990 |  | 91,228 |  | 1,278,648 |
Accumulated depreciation |  |  |  |  |
Balance, beginning of year | (315,261 | ) | (177,906 | ) | — |  | — |  | (493,167 | )
Charge for the year | (44,772 | ) | (61,414 | ) | — |  | — |  | (106,186 | )
Disposals | 12,728 |  |  |  |  | 12,728 |
Write off | 9,152 |  | — |  | — |  | — |  | 9,152 |
Balance, end of year | (338,153 | ) | (239,320 | ) | — |  | — |  | (577,473 | )
Net book value at December 31, 2018 | 283,729 |  | 224,228 |  | 101,990 |  | 91,228 |  | 701,175 |
9. | PROPERTY, PLANT AND EQUIPMENT (Continued)
| December 31, 2017
| Plant and equipment (1) |  | Mineral properties subject to depletion(3) |  | Mineral properties not yet subject to depletion(2)(3)(5) |  | Exploration and evaluation assets(4) |  | Total |
| $ |  | $ |  | $ |  | $ |  | $ |
Cost |  |  |  |  |
Balance, beginning of year | 509,008 |  | 306,277 |  | 133,560 |  | 92,720 |  | 1,041,565 |
Additions | 33,738 |  | 43,118 |  | 33,589 |  | 758 |  | 111,203 |
Disposals | (13,555 | ) | — |  | — |  | (1,000 | ) | (14,555 | )
Impairment reversal | 24,357 |  | — |  | — |  | — |  | 24,357 |
Property write downs | — |  | (747 | ) | — |  | (899 | ) | (1,646 | )
Change in estimate of close down and restoration provision | (8,458 | ) | (670 | ) | — |  | — |  | (9,128 | )
Transfers | — |  | 45,295 |  | (45,295 | ) | — |  | — |
Balance, end of year | 545,090 |  | 393,273 |  | 121,854 |  | 91,579 |  | 1,151,796 |
Accumulated depreciation |  |  |  |  |
Balance, beginning of year | (276,170 | ) | (101,567 | ) | — |  | — |  | (377,737 | )
Charge for the year | (50,915 | ) | (76,339 | ) | — |  | — |  | (127,254 | )
Disposals | 11,824 |  | — |  | — |  | — |  | 11,824 |
Balance, end of year | (315,261 | ) | (177,906 | ) | — |  | — |  | (493,167 | )
Net book value at December 31, 2017 | 229,829 |  | 215,367 |  | 121,854 |  | 91,579 |  | 658,629 |
(1) | Includes assets under construction of $44,858,000 at December 31, 2018 (December 31, 2017 - $17,307,000).
(2) | Includes assets under construction of $Nil at December 31, 2018 (December 31, 2017 - $3,715,000).
(3) | We converted Inferred Mineral Resources to Mineral Reserves at our Seabee Gold Operation and correspondingly have transferred $33,635,000 (December 31, 2017 - $45,295,000) from mineral properties not yet subject to depletion to being subject to depletion.
(4) | On January 16, 2017, we entered into an option agreement with Silver One Resources Inc. ("Silver One") in respect of our Candelaria project in the United States for consideration consisting of $1,000,000 worth of Silver One shares issued on January 20, 2017, and three annual installments of $1,000,000 worth of Silver One shares. Under the terms of this agreement, Silver One has three years to evaluate the Candelaria project. On January 19, 2019, we received the third installment of $1,000,000 worth of Silver One shares.
(5) | We have changed the presentation of the Pitarrilla project in all periods presented in the tables above from exploration and evaluation assets to mineral properties not yet subject to depletion.
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit | A discounted cash flow analysis was performed using a discount rate of 10% and the following estimated metal prices;
9. | PROPERTY, PLANT AND EQUIPMENT (Continued)
| 2017 | 2018 | 2019 | 2020 | LT
Silver / oz | $17.93 | $18.72 | $19.14 | $19.53 | $19.65
Lead / lb | $1.01 | $1.03 | $1.02 | $0.99 | $0.94
Zinc / lb | $1.27 | $1.31 | $1.24 | $1.18 | $1.06

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