Dundee Sustainable Technologies Advances toward Commercialization of its Arsenic Stabilization Technology

MONTREAL, QUEBEC, September 7th, 2016 – Dundee Sustainable Technologies Inc. (“DST” or the “Corporation”) (CSE: DST) is pleased to announce that it has successfully completed a piloting program (the “Program”) with an international gold mining company (the “Miner”) (Refer to February 3rd, 2016 press release). The Program demonstrated the technical feasibility of integrating DST proprietary arsenic stabilization technology (the “DST Technology”) into the Miner’s operations.

DST Technology is designed for the sequestration of arsenic in a stable glass form. During the course of the piloting program, DST reached optimal processing conditions for the successful vitrification of arsenical matter provided by the Miner. Several piloting runs allowed for arsenical material to be processed and to generate 670 kg of vitrified arsenical matter. The Program demonstrated the stability of the produced glass, which contained up to 20.4% arsenic, by passing the United States Environmental Protection Agency's (EPA) toxicity characterization leaching procedure (TCLP, Method 1311) with 2.09 mg of arsenic per litre (limit of 5 mg/L).

The Program is part of a two-phase approach aimed, in a first phase, at confirming, at the pilot plant scale, that the DST Technology can be successfully implemented on material provided by the Miner for arsenic stabilization. In a second phase, a study may be performed, at the pre-feasibility level, to evaluate the technical and economic implications of a full-scale DST arsenic stabilization plant located at the site of the Miner’s operation.

DST Technology produces a more stable product than current industrial practices with competitive cost in terms of reagent and energy consumption when compared with the stabilization of arsenic by hydrated iron arsenate (scorodite). DST Technology is opening new opportunities for deposits or concentrates considered to contain too much arsenic to be exploited using conventional approaches.

These successful results constitute a major milestone in DST’s efforts to implement its arsenic stabilization technology on an industrial scale.

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