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Pilot plant - Operations costs (Details) - CAD ($) | 3 Months Ended | 9 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Pilot plant |  |  |  |
Pilot plant operations | $ 4,427,565 | $ 1,489,602 | $ 10,402,608 | $ 5,770,808
Internet |  |  |  |
Pilot plant |  |  |  |
Pilot plant operations | 2,956 | 2,745 | 8,421 | 8,236
Personnel |  |  |  |
Pilot plant |  |  |  |
Pilot plant operations | 1,298,278 | 872,247 | 4,340,725 | 2,571,454
Reagents |  |  |  |
Pilot plant |  |  |  |
Pilot plant operations | 1,894,508 | 305,722 | 2,478,975 | 1,060,045
Repairs and maintenance |  |  |  |
Pilot plant |  |  |  |
Pilot plant operations | 7,013 | 63,981 | 15,972 | 247,854
Supplies |  |  |  |
Pilot plant |  |  |  |
Pilot plant operations | 869,718 | 80,423 | 2,551,944 | 726,859
Testwork |  |  |  |
Pilot plant |  |  |  |
Pilot plant operations | 297,127 | 73,890 | 856,733 | 457,106
Office trailer rental |  |  |  |
Pilot plant |  |  |  |
Pilot plant operations | 10,509 | 8,064 | 30,052 | 23,557
Utilities |  |  |  |
Pilot plant |  |  |  |
Pilot plant operations | $ 47,456 | 75,394 | $ 119,786 | $ 675,697
Foreign exchange. |  |  |  |
Pilot plant |  |  |  |
Pilot plant operations |  | $ 7,136 |  |

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