Canadian Mining Journal


GOLD: Dundee Technologies attains 98.8% gold recovery without cyanide

MONTREAL, QUEBEC Dundee Sustainable Technologies has successfully completed its cyanide-free piloting campaign on gold concentrates provided by Empresa Nacional de Minería, Chile (ENAMI), using DST’s proprietary technology.

In September 2015, DST received 2.0 tonnes of concentrate from ENAMI to be used for the test. The concentrate had a grade of 121 g/t Au, 9.2% Cu and a mercury content of 787 g/t. Through controlled oxidation, DST removed 99.7% of the sulphide and 99.6% of the mercury content. The calcine material was then submitted to acid and water leaching where 99% of the copper was recovered as copper sulphate. DST’s chlorination process that followed achieved a gold recovery of 98.8% and a final gold deposition over silica recovery of 99.8%.

DST is pleased with the results of the piloting phase. The pilot tests were part of a phased approach established between DST and ENAMI with the objective of implementing a processing facility, utilizing DST’s patented technology, in Chile.

DST and ENAMI will advance towards developing the technical and economic feasibility criteria for the implementation on a commercial scale of the DST process in Chile.

Learn more about cyanide-free gold recovery at

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