{kanada_flagge}In-situ leaching of uranium has become the dominant recovery technique over the past 20 years, making Kazakhstan, among others, the largest uranium producer in the world. The concept of in situ leaching for gold deposits, on the other hand, is still in its infancy. But there are initial, extremely encouraging test results – and with a technology that is free of cyanide: EnviroMetal Technologies Inc. (CSE:ETI; OTCQX:EVLLF; FSE:7N2) now reports the successful completion of the first phase of test work it conducted on behalf of its partner company Group 11 Technologies Inc.
Using EnviroMetals’ environmentally friendly chemical reagent, recovery tests on uncrushed half-core samples showed gold recoveries ranging from 15.9% to 77.5%, with an average of 48.2%, with most results achieved in less than 30 days. Comparative bottle roll tests conducted on crushed and ground material yielded gold recoveries from 38.3% to 89.5% with an average of 61.4%.
Duane Nelson, EnviroMetal CEO, commented, “These test results are very encouraging. Our initial research into this application for our chemistry shows that ISR applications have real potential, and these results confirm those early indications. We are cautiously optimistic that our reagent chemistry, combined with Group 11’s remarkable expertise in ISR process technologies, could produce a world-changing technology for the gold mining industry. We look forward to continuing to work with Group 11 as we move towards commercialization of this truly breakthrough innovation for the gold mining industry.”
EnviroMetal and Group 11 are developing an environmentally friendly process for the in-situ recovery (“ISR”) of gold and other metals. As part of an ongoing collaboration with Group 11, EnviroMetal conducted an initial 6-month research program applying the Company’s proprietary and environmentally friendly gold recovery technology to core samples from the Rattlesnake Hills Project (“Rattlesnake”). Rattlesnake is a gold exploration property in Wyoming on which Group 11 has acquired an option to test and develop ISR technology for gold. Core samples used in the first phase of test work were selected to cover the maximum range of gold-bearing rock types and gold grades present at Rattlesnake.
Dr. Dennis Stover, Group 11’s Chief Technical Officer and co-discoverer of the in-situ recovery process for use in uranium mining, said, “Group 11 is very pleased with the initial testing which showed good results in extracting gold from the existing core sample using an environmentally friendly solvent. This first step will form the basis for future tests on the use of the Lixiviant solvent in combination with in-situ recovery technology. Group 11 is working to develop new environmentally friendly options for recovering gold and other metals through less invasive ISR extraction, which is widely used in the uranium industry.”
Bottom line: it’s remarkable how long innovations in the mining sector take to catch on. EnviroMetal and its partner Group 11 are not afraid to take the long view. They want to transfer the idea of in-situ leaching, which is now standard in uranium mining, to the extraction of certain gold deposits. To do this, they first need a completely different chemistry, i.e. an alternative to cyanide. EnviroMetal has already developed a suitable chemistry and uses it successfully in the recycling of printed circuit boards or in the processing of gold concentrates. However, the difficulties of gold mining on site are of a completely different dimension. On the other hand, a huge premium beckons on the other side, which would mean a revolution in the gold industry. The team behind Group 11 was involved in the introduction of in-situ leaching for uranium more than 20 years ago. So they are not dreamers; they are demonstrated leaders in mining innovation, and in-situ recovery for gold is what they have in their sites.
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