DST’s Clevr Process Achieves 95% Gold Extraction

Dundee FI

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MONTREAL, QUEBEC, June 10, 2020 – Dundee Sustainable Technologies Inc. (“DST” or the “Corporation”) (CSE: DST) is pleased to announce positive results from a metallurgical test program utilising DST’s CLEVR ProcessTM (the “CLEVR Process” or “Technology”) on mineralised samples from a Top Tier Gold Producer (the “Producer”).

The Corporation received a ~10-kilogram sample of material from the Producer’s operating gold mine located in a South American jurisdiction. DST was mandated by the Producer to conduct a metallurgical test program at its facilities in Thetford Mines, Canada, with the objective of defining and quantifying the gold extraction amenability of the CLEVR Process on the provided material.

In May 2020, DST completed the metallurgical test program and is pleased to announce that the direct application of the CLEVR Process on the Producer’s sample achieved gold extraction yields of up to 95.6%. Given the low sulfide concentration of the sample, no oxidation was necessary before proceeding to the CLEVR Process leaching step.

The direct CLEVR Process leaching, without any pre-treatment, was successful and demonstrated higher gold extraction yields (>90%) when compared with cyanidation (67.6%) tests conducted on the same material. DST’s standard CLEVR Process conditions were utilised, which allowed for superior gold yields in a fraction of the time (1-hour leaching time).

In addition, the solid tailings residues produced by the CLEVR Process met the U.S. Environmental Protection Agency’s (“EPA”) Toxicity Characterisation Leaching Procedure (“TCLP”, Method 1311) and may be considered as non-hazardous waste products.

DST is very excited with the results obtained using the CLEVR Process and the collaboration with the Producer. The Corporation will continue its development efforts with the Producer to further develop this promising opportunity and the technical and economic parameters of DST’s Technology.


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