Dundee Sustainable Technologies Inc. (“DST” or the “Corporation”) (DST:CSE) is pleased to announce that the United States Patent and Trademark Office has issued a notice of allowance for DST patent application (number 13/957,002) pertaining to gold recovery over silica.
Collection of gold over silica
This patent is related to a method for recovering gold from a pregnant solution resulting from halogen leaching of an ore, while facilitating the recycling of the halogens from the resulting barren solution. The same patent is also pending in Canada and several Latin America countries.
An essential complement of gold extraction with halogens
This method has been proven well adapted to the halogens extraction process and a simple fusion of the loaded silica makes pure gold recovery easy and complete.
About Dundee Sustainable Technologies, a company controlled by Dundee Corporation
DST is engaged in the development of technologies for the treatment of refractory ores containing sulfides and arsenic. DST has developed proprietary hydrometallurgical processes, and owns the related patents, for the extraction of precious and base metals from ores, concentrates and tailings, which cannot be extracted with conventional processes because of metallurgical issues or environmental considerations.
DST’s patented approach provides a cyanide-free process to allow the exploitation of gold and other deposits that would otherwise face metallurgical issues with conventional methods. The primary benefits of the innovative technology are shorter processing times, a closed-loop operation eliminating the need for costly tailings pond, reduced environmental footprint related to inert and stable characteristics of the tailings, and lesser emissions due to lower energy consumption.
The process developed by DST is a recognized “green technology” for which it was awarded a $5.7 million grant towards the construction and operation of a $25 million demonstration plant. With a capacity of 15 tonnes per day of concentrate, the demonstration plant will serve as a proof of concept for the chlorination extraction technology on an industrial scale and under continuous operating conditions.
DST has tested several different gold deposits, both oxide and sulfide ores at the lab level and at its pilot plant. These tests have, consistently achieved gold recoveries in excess of 90{92d3d6fd85a76c012ea375328005e518e768e12ace6b1722b71965c2a02ea7ce}, using chlorination instead of cyanide.