Showing the advantages of coarse-grained pegmatite, further metallurgical tests on hardrock lithium brought impressive results for 92 Resources’ TSXV:NTY Hidden Lake project in the Northwest Territories. The company processed about 400 kilograms of pegmatite collected last year, putting it through a dense media separation mini-pilot plant. The result brought over 40 kilos of spodumene concentrate averaging a high-grade 6.11% Li2O.
Following last month’s results from heavy liquid separation tests, 92 Resources considers the latest work both highly encouraging and in line with expectations. “The test work continues to support that a final overall concentrate grade of 6% to 6.5% Li2O at high recovery (80% to 85%) is achievable using low-cost and conventional processing techniques,” the company stated.
92 Resources now sees two possible approaches for lithium recovery. The first would use flotation only, which produced the successful results released in December. The second would aim for similar results through a combination of flotation and dense media separation. The dual approach offers lower costs, greater control, shorter start-up time and less risk.
This graphic illustrates the Hidden Lake flowsheet’s dual approach, in which +0.85 mm material undergoes dense media separation to produce concentrate, tailings and middlings. The middlings then combine with the -0.85 mm material to undergo flotation, producing more concentrate and tailings.
Still to come from the test work are tantalum assays, which will be studied for better recovery. The road-accessible 1,849-hectare property sits 40 kilometres east of Yellowknife.
Apart from the Hidden Lake flagship, 92 Resourcespicked up three hardrock lithium projects in Quebec’s James Bay region last September. Surface samples from the Corvette property showed results up to 7.32% Li2O, along with anomalous tantalum of 90 ppm Ta2O5.
The company also has a 43-101 technical report planned for its Golden frac sand project in eastern British Columbia.
Last week 92 Resources closed a private placement of $1.14 million.