Dundee Sustainable Technologies Inc. Obtains 96.1% Gold Recovery from Concentrate
MONTREAL, QUEBEC, September 11, 2014 – Dundee Sustainable Technologies Inc. (“DST” or the “Corporation”) (CSE: DST), the developer and owner of proprietary technologies to serve the natural resource sector with environmentally friendly procedures, is pleased to announce successful piloting results and a 96.1% gold recovery on high grade concentrate.
In May of 2014, DST received two concentrate samples totalling 1,300 kilograms from a privately held gold mining company. The samples were processed at DST’s Thetford Mines facility using its patented cyanide and mercury free gold extraction process.
Sample #1 composition
| Au (g/t) |
Ag (g/t) |
As (%) |
Ca (%) |
Cu (%) |
Fe (%) |
Pb (%) |
S2 (%) |
Te (g/t) |
Cd (%) |
Zn (%) |
| 382 | 804 | 0.16 | 0.23 | 1.48 | 25.1 | 18.1 | 32.6 | 59 | 0.12 | 9.71 |
A two (2) hour contact time, using DST’s chlorination process, was necessary to achieve a gold extraction yield of 96.1% in the reactor, despite the presence of substantial base metals in the concentrate. The gold was recovered on silica with an efficiency of 99%. The gold loaded silica was melted to produce the gold bullion.
DST has entered into an arrangement to process material once the demonstration plant becomes operational in mid-January 2015. Pursuant to this arrangement DST may at its option process up to 15 tonnes of their produced concentrate per day, provided such concentrate contains a minimum of 10 ounces of gold per tonne. As a result, up to 4,500 tonnes of concentrate (current values of +$15,000 per tonne) may be processed by DST, over a 12 month period, during which DST will receive a 50% interest in the net profits arising from the sales of the end products, net of mining, concentration, processing and transportation costs and expenses.
Subsequently and providing that both parties are satisfied with the results of the processing, the parties can discuss the feasibility of implementing a DST designed cyanide and mercury free extraction plant on the property on terms to be negotiated by the parties.
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