| 2017 | 2016 | 2015 | |||||||
| $ | $ | $ | |||||||
| Deferred income tax assets | |||||||||
| Non-capital losses available | 20,998 | 26,679 | 26,547 | ||||||
| Capital losses available | 1,113 | 1,072 | 1,072 | ||||||
| Resource tax pools in excess of net book value | 5,279 | 4,846 | 3,726 | ||||||
| Share issue costs and others | 654 | 1,171 | 1,133 | ||||||
| Unrecognized deferred tax assets | 28,044 | 33,768 | 32,478 |