Dundee Sustainable Technologies Provides Update on the Commissioning of its Demonstration Plant

MONTREAL, QUEBEC, June 22, 2015 – Dundee Sustainable Technologies Inc. (“DST”) (CSE: DST) is pleased to announce that it has successfully achieved the oxidation of a gold concentrate with a sulfur removal at the level of 99.7%. Moreover, the removed sulfur was transformed into sulfuric acid with an efficiency higher than 99.9%. This operation was performed as part of the on-going commissioning phase of its industrial scale demonstration plant (the Demonstration Plant”) as previously announced on June 8th. The following table presents a summary of the results that were obtained.

	Gold*	Copper*	Sulfur	Sulfur Removal
Concentrate	5.4 g/T	0.8%	49.5%	–
Calcine	6.2 g/T	0.9%	0.15%	99.7%

*Variations in metals concentrations are a consequence of weight losses during oxidation

The oxidation of the concentrate is a critical step in the treatment of the concentrate prior to the gold and copper extraction. These results were obtained on a gold/copper sulphide concentrate that was received from Bulgaria, a region where cyanide has been banned. In addition, this material will allow DST to demonstrate the suitability of its process to extract gold in the presence of copper, a known issue for cyanidation at this concentration of copper.

“This first results obtained from the operation of our newly built Demonstration Plant are outstanding. The targeted value of 1% residual sulphide in the oxidation product (“calcine”) was exceeded on the first attempt, while keeping full control over the gases. Our level of confidence remains high for the commissioning of the other sectors of the plant within schedule”, stated John W. Mercer, President and CEO of DST.

The commissioning phase of the Demonstration Plant is expected to be completed in a matter of weeks and will be followed by the operation of the plant on the Bulgarian material that should be completed during the fourth quarter of the year. DST is also currently negotiating the purchase of high grade gold concentrates to be processed following the completion of the demonstration phase on the Bulgarian m

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