The mining newspaper for Alaska and Canada's North
Tests demonstrated no potential issues for acid rock drainage North of 60 Mining News – December 16, 2022
Grande Portage Resources Ltd. Dec. 13 announced very positive results of environmental testing at the company's Herbert Gold project a few miles north of Juneau, Alaska.
Done as part of the permitting process, acid base accounting is conducted to test the acid-generating potential of the rocks around any potential mine site, in this case, the Herbert Gold deposit in Southeast Alaska.
Testing was performed by Geochemical Solutions LLC of Colorado, which analyzed a total of eight baseline samples from wall rocks adjacent to the mineralized veins within the Herbert Gold project area. According to Geochemical, all samples reported low acid potential and very high neutralization potential such that all rocks are net acid consumers and, therefore, unlikely to produce acid.
Additionally, surface water was collected from the gold project to assess chemistries and suspended solids. Geochemical concluded that "chemically, the water is very clean with very low total dissolved solids."
As Herbert Gold inches closer to production, Grande Portage continues to engage in the necessary steps for an operating mine.
"These results demonstrate no potential issues for acid rock drainage at the Herbert Gold project," said Grande Portage CEO Ian Klassen. "The simple metallurgy and lack of identifiable environmental issues assist the company in developing the Herbert Gold project's NI 43-101 gold resource."
According to a 2021 calculation, Herbert Gold hosts 3.64 million metric tons of indicated resource averaging 10.23 grams per metric ton (1.2 million oz) gold and 5.87 g/t (686,700 oz) silver; plus 1.14 million metric tons of inferred resource averaging 8.91 g/t (325,900 oz) gold and 4.63 g/t (169,300 oz) silver.
This year, the company completed nearly 10,000 meters of drilling focused on upgrading and expanding this high-grade gold resource. Assays are pending from this program completed in early November.
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