December 31, 2017 |
December 31, 2016 |
January 1, 2016 |
||||||||||
| Process material stockpiles | $ | 3,565,892 | $ | 2,604,720 | $ | 2,434,943 | ||||||
| Concentrate inventory | 3,436,879 | 1,895,808 | 159,998 | |||||||||
| Materials and supplies | 2,099,486 | 1,303,484 | 737,598 | |||||||||
| $ | 9,102,257 | $ | 5,804,012 | $ | 3,332,539 | |||||||
| The amount of inventory recognized as an expense for the year ended December 31, 2017, totalled $21,975,130 (2016 – $19,160,800; 2015 - $8,573,200), and includes production costs and depreciation and depletion directly attributable to the inventory production process. |