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Revenue | 9 Months Ended
--- | ---
Sep. 30, 2018
Disclosure of disaggregation of revenue from contracts with customers [abstract] |
Revenue | 12. Revenue The following is a disaggregation of revenue categorized by commodities sold:
|  | Three-month |  |  | Three-month |  |  | Nine-month |  |  | Nine-month |
|  | period ended |  |  | period ended |  |  | period ended |  |  | period ended |
|  | September 30, |  |  | September 30, |  |  | September 30, |  |  | September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Silver |  |  |  |  |  |  |  |  |  |  |  |
Provisional sales revenue |  | $ | 4,563 |  |  | $ | 5,813 |  |  | $ | 16,501 |  |  | $ | 23,986 |
Derivative pricing adjustments |  |  | (298 | ) |  |  | 151 |  |  |  | (343 | ) |  |  | 1,466 |
|  |  | 4,265 |  |  |  | 5,964 |  |  |  | 16,158 |  |  |  | 25,452 |
Zinc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisional sales revenue |  | $ | 8,941 |  |  | $ | 1,406 |  |  | $ | 32,104 |  |  | $ | 7,655 |
Derivative pricing adjustments |  |  | (2,494 | ) |  |  | 330 |  |  |  | (2,726 | ) |  |  | 544 |
|  |  | 6,447 |  |  |  | 1,736 |  |  |  | 29,378 |  |  |  | 8,199 |
Lead |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisional sales revenue |  | $ | 6,785 |  |  | $ | 5,475 |  |  | $ | 22,641 |  |  | $ | 18,461 |
Derivative pricing adjustments |  |  | (489 | ) |  |  | 213 |  |  |  | (440 | ) |  |  | 312 |
|  |  | 6,296 |  |  |  | 5,688 |  |  |  | 22,201 |  |  |  | 18,773 |
Other by-products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisional sales revenue |  | $ | 133 |  |  | $ | 300 |  |  | $ | 360 |  |  | $ | 1,927 |
Derivative pricing adjustments |  |  | (12 | ) |  |  | 1 |  |  |  | 3 |  |  |  | 2 |
|  |  | 121 |  |  |  | 301 |  |  |  | 363 |  |  |  | 1,929 |
Gross revenue |  | $ | 17,129 |  |  | $ | 13,689 |  |  | $ | 68,100 |  |  | $ | 54,353 |
Treatment and selling costs |  |  | (5,395 | ) |  |  | (3,875 | ) |  |  | (18,632 | ) |  |  | (12,119 | )
|  | $ | 11,734 |  |  | $ | 9,814 |  |  | $ | 49,468 |  |  | $ | 42,234 |
Derivative pricing adjustments represent subsequent variations in revenue recognized as an embedded derivative from contracts with customers and are accounted for as financial instruments (see Note 16). Revenue from contracts with customers is recognized net of treatment and selling costs if payment of those amounts is enforced at the time of sale.

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