| NOTE 13: | INCOME TAXES |
| | | Year Ended July 31, | | |||||||
| | | 2017 | | 2016 | | 2015 | | |||
| Federal income tax provision rate | | | 35.00 | % | | 35.00 | % | | 35.00 | % |
| State income tax provision rate, net of federal income tax effect | | | 0.43 | % | | 0.35 | % | | 0.32 | % |
| Total income tax provision rate | | | 35.43 | % | | 35.35 | % | | 35.32 | % |
| | | Year Ended July 31, | | |||||||
| | | 2017 | | 2016 | | 2015 | | |||
| Loss before income taxes | | $ | (18,005,411) | | $ | (17,362,111) | | $ | (23,397,341) | |
| Corporate tax rate | | | 35.43 | % | | 35.35 | % | | 35.32 | % |
| Expected tax recovery | | | (6,379,317) | | | (6,137,506) | | | (8,263,941) | |
| Increase (decrease) resulting from | | | | | | | | | | |
| Foreign tax rate differences | | | 185,700 | | | 230,148 | | | 223,980 | |
| Permanent differences | | | 446,377 | | | 806,736 | | | 1,473,225 | |
| Prior year true-up | | | (804,822) | | | (647,307) | | | 50,025 | |
| State tax rate true-up | | | (223,770) | | | (105,843) | | | (205,285) | |
| Property acquisition | | | (491,798) | | | - | | | - | |
| Foreign exchange rate differences | | | (3,248) | | | 129,015 | | | 144,242 | |
| Other | | | 81,660 | | | 59,705 | | | 62,398 | |
| Change in valuation allowance | | | 7,149,654 | | | 5,627,606 | | | 6,474,775 | |
| Tax adjustment from operations | | | (39,564) | | | (37,446) | | | (40,581) | |
| Unrealized loss, other comprehensive loss | | | 5,209 | | | 5,207 | | | 5,168 | |
| Deferred income tax benefit | | | (34,355) | | $ | (32,239) | | $ | (35,413) | |
| | | Year Ended July 31, | | |||||||
| | | 2017 | | 2016 | | 2015 | | |||
| United States | | $ | (17,303,682) | | $ | (16,488,447) | | $ | (22,612,974) | |
| Canada | | | 45,316 | | | 54,216 | | | 158,616 | |
| Paraguay | | $ | (747,045) | | | (927,880) | | | (942,983) | |
| | | | (18,005,411) | | $ | (17,362,111) | | $ | (23,397,341) | |
| | | July 31, 2017 | | July 31, 2016 | | ||
| Deferred tax assets (liabilities) | | | | | | | |
| Mineral property acquisitions | | $ | 2,533,819 | | $ | 1,917,796 | |
| Exploration costs | | | 10,950,241 | | | 10,648,043 | |
| Stock option expense | | | 7,031,732 | | | 7,081,853 | |
| Depreciable property | | | (367,164) | | | (66,912) | |
| Inventories | | | (5,471,486) | | | (3,632,178) | |
| Asset retirement obligations | | | (130,740) | | | (220,209) | |
| Other | | | 179,518 | | | 271,468 | |
| Loss carry forward | | | 57,989,069 | | | 49,565,476 | |
| | | | 72,714,989 | | | 65,565,337 | |
| Valuation allowance | | | (72,720,198) | | | (65,570,544) | |
| Deferred tax assets | | | (5,209) | | | (5,207) | |
| Deferred tax assets, other comprehensive loss | | | 5,209 | | | 5,207 | |
| | | | | | | | |
| Deferred tax liabilities | | | | | | | |
| Mineral property acquisition | | | (609,470) | | | (643,825) | |
| Net deferred tax liabilities | | $ | (609,470) | | $ | (643,825) | |
| July 31, 2023 | | $ | 180,892 | |
| July 31, 2024 | | | 228,757 | |
| July 31, 2025 | | | 507,833 | |
| July 31, 2026 | | | 5,895,221 | |
| July 31, 2027 | | | 3,892,722 | |
| July 31, 2028 | | | 9,913,533 | |
| July 31, 2029 | | | 8,469,032 | |
| July 31, 2030 | | | 7,319,644 | |
| July 31, 2031 | | | 14,420,187 | |
| July 31, 2032 | | | 15,014,013 | |
| July 31, 2033 | | | 16,332,007 | |
| July 31, 2034 | | | 21,605,546 | |
| July 31, 2035 | | | 19,357,683 | |
| July 31, 2036 | | | 18,490,648 | |
| July 31, 2037 | | | 19,087,066 | |
| | | $ | 160,714,784 | |
| July 31, 2027 | | $ | 183,105 | |
| July 31, 2028 | | | 629,788 | |
| July 31, 2029 | | | 769,072 | |
| July 31, 2030 | | | 1,035,403 | |
| July 31, 2031 | | | 2,210,551 | |
| July 31, 2032 | | | 761,843 | |
| July 31, 2033 | | | 69,854 | |
| July 31, 2034 | | | 61,769 | |
| July 31, 2035 | | | 41,173 | |
| July 31, 2036 | | | 9,917 | |
| | | $ | 5,772,475 | |