Dundee Tech, Radisson tests remove 92% of As from Au
DUNDEE SUSTAINABLE Technologies Inc. successfully removed 92.2 per cent of the arsenic content and demonstrated, at the pilot scale, that the refractory parcel of O’Brien gold material can undergo a pretreatment to remove arsenic and create a mineral concentrate with levels of arsenic that are acceptable to the market and traditional gold recovery circuits.
In February 2017, DST received five tonnes of representative material from the O’Brien gold project. The mate rial was crushed an d ground. The free gold was recovered by gravimetry and the balance of the material was concentrated through flotation. This approach mirrored Radisson’s planned recovery circuit in the preliminary economic assessment. DST generated a gold concentrate which contained 109 grams per tonne of gold, 11.6 per cent arsenic and 19.9 per cent sulphur. Using’s DST thermal decomposition in an oxygen-deprived-environment approach, the arsenic content was reduced by 92 per cent, with no gold losses while leaving a sulphur content of eight per cent.
The arsenic depleted concentrate was treated for gold extraction using both DST’s patented chlorination technology and cyanidation where gold recoveries of 94.6 per cent and 93.5 per cent were achieved, respectively.
The process was overseen by an independent consulting firm so that the piloting test program and results could be included in Radisson’s future preliminary economic assessment.
Mario Bouchard, president of Radisson commented: “For Radisson the DST’s two new processes tested, neutralization of the arsenic by vitrification and recovery of the gold by chlorination, demonstrate economical and environmental ad van tages. We are pleased to collaborate with DST and we will consider seriously those two innovations in our development plans.”
“These excellent piloting results demonstrate the efficiency of the arsenopyrite treatment approach developed by DST and, combined with the company’s arsenic stabilization technology, provides a cost-effective alternative to POX and offsets market penalties for complex arsenopyrite bearing deposits.” said Brian Howlett, DST’s president and chief executive officer.
The company continues the commercialization of its cyanide-free gold extraction and arsenic stabilization technologies. DST also provides its technical expertise and facilities to companies wishing to further evaluate the development of their projects using the corporation laboratory, piloting and/or industrial demonstration facilities on specific projects in need of viable processing capacities, and to initiate engineering studies required for an industrial implementation.
About Dundee Sustainable Technologies Inc., a company controlled by Dundee Corporation
The corporation is engaged in the development and commercialization of environment-friendly technologies for the treatment of materials in the mining industry. Through the development of patented, proprietary processes, DST extracts precious and base metals from mineralized material, concentrates and tailings, while stabilizing contaminants such as arsenic, which could not otherwise be extracted or stabilized with conventional processes because of metallurgical issues or environmental considerations. DST has filed, published and was granted patents for these processes in several countries.
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Brahm Marvin Gelfand, Mark E Goodman, Nathan Edward Goodman, Brian Michael Howlett, Mario Jacob, Hubert Romeo Marleau, Geoff Morphy
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