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MERCURY-FREE AND CYANIDE-FREE PROCESS FOR GOLD EXTRACTION
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OUR VISION
“The development of an economically viable alternative to the conventional and widespread mercury and cyanide process for gold extraction without the short and long term environmental impacts.”
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DST’S TECHNOLOGY
Dundee Sustainable Technologies has developed proprietary hydrometallurgical processes for the extraction of base and precious metals from ores, concentrates and tailings, which cannot be exploited with conventional processes because of internal refractoriness or environmental considerations.
FAST 1-2 hour contact time GREEN Mercury-free and cyanide-free process FLEXIBLE Economic not affected by base metals presence PROFITABLE Competitive process costs
▶ HIGH EXTRACTION YIELD THROUGH CHLORINATION
▶ CLOSED-LOOP IN TERM OF WATER
▶ THETFORD MINES PLANT - BUILT IN 2010
▶ ENVIRONMENTAL, SOCIAL, AND ECONOMIC DUE DILIGENCE BY THE CANADIAN FEDERAL GOVERNMENT AND QUEBEC GOVERNMENT
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PLANT CAPACITY ▶ Ore feedrate: 200 TPD ▶ Concentrate gold extraction circuit: 10 TPD ▶ Gold extraction yield: 95 % ▶ Ore grade: 5 g/T Au or higher
CAPITAL COSTS ▶ Modular concentration plant: $3M ▶ Gold extraction plant: $10M
TYPICAL SITE LAYOUT
STEP 1
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STEP 2
FROM CRUSHING TO GOLD ▶ Rapid deployment ▶ Easily re-locatable, equipment mounted on
road transportable trailer assemblies and containers
▶ Minimum site preparation
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CONCENTRATION PLANT
MODULAR CONCENTRATION CIRCUIT
1. Crushing
2. Grinding, SAG Mill, 120 micron grind size, 15 kw/h/t bond work index
3. Gravity concentrator, Falcon SB 750 gravity concentrator, 10+ t/hr capacity
4. *Flotation circuit: four (4) banks of 50 cubic ft. Denver type flotation cells
Operational Concentration Plant: $3M
* Flotation concentrates require pre-treatment by oxidation prior to chlorination 1
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CHLORINATIONFILTRATION
GOLD DEPOSITION
BRINE TREATMENT
ELECTROLISIS AND WATER TREATMENT
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MODULAR CHLORINATION GOLD EXTRACTION CIRCUIT
5. Concentrate feed to chlorination reactor
6. Filtration of gold solution
7. Gold deposition by silica absorption
8. Gold depleted solution treatment (neutralisation & reverse osmosis concentration)
9. Electrolysis, regeneration of hypohalides
10. Closed loop back to chlorination reactor
Chlorination Plant Cost: $10M
MODULAR WATER TREATMENT CIRCUITto support local communities with drinking water
CHLORINATION PLANT
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ENVIRONMENTAL ADVANTAGES
▶ No mercury or cyanide
▶ Closed-loop process with recycling of reagents
▶ Closed-loop process with recycling of water, eliminating the need for ponds and the risks of containment collapse
▶ No liquids or gaseous effluents
▶ Solid residues are sulphur and base metal depleted, not acid generating
BENEFITS FOR THE MINING INDUSTRY
▶ Environmentally friendly extraction process based on chlorination
▶ Technology developed for treatment of refractory ores
▶ Increasing social acceptability by promoting environmentally safe processes
▶ Advantageous capital costs
▶ Modular Implementation
AWARDS
▶ Programme de Démonstration de technologies Vertes, Gouvernement du Québec, Grant of $700K grant in 2012
▶ Sustainable Development Technology Canada, $5M Contribution in 2013
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Au Au
ClCl
Cl
Cl Cl Cl
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HEAD OFFICE
600, de Maisonneuve Blvd West, Suite 2750Montréal, Qc, Canada 514-866-6001
THETFORD MINES PLANT
3700 rue du Lac NoirThetford Mines, Qc, Canada 418-423-7247
Pierre Gauthier, President & [email protected]
