News outDundee Sustainable Technologies Inc.NEWS RELEASEDST signs contract with Quebec Developer for Arsenic Stabilisation test work using its GlassLock ProcessTMMONTREAL, QUEBEC, January 26th 2021 – Dundee Sustainable Technologies Inc. (“DST” or the “Corporation”) (CSE: DST) is pleased to announce that it has entered into an agreement with a Canadian gold developer (the “Developer”) to conduct arsenic vitrification test work using its GlassLock ProcessTM (“GlassLock” or the “Technology”) on legacy arsenic trioxide material from a gold project located within the Abitibi Region of Qubec (the “Project”).DST and the Developer discussed the technical feasibility and interest, by the Developer, to evaluate the applicability of the GlassLock ProcessTM on arsenic bearing roaster dusts from the Project. The Project is host to approximately 2,500 tonnes of arsenic bearing dusts. The arsenic concentration within the dusts is known to be between 40 and 60%, mostly in the form of arsenic trioxide. The arsenical dusts also contain a gold content up to 10 g/t of gold. The gold recovery will be investigated, qualified, and quantified as a mean of offsetting the remediation costs associated with the stabilisation of the arsenic. As part of the Developer’s environmental compliance plan/policy, the arsenic bearing dusts represent an important liability and there is a requirement for them to be safely and permanently remediated. In December 2020, over 300 kg of the Project arsenic dusts were received at DST’s technical facilities for the test work program. The goal of this testing program is to identify the set of conditions for the gold recovery and the successful stabilisation of arsenic using DST’s Technology.The GlassLock ProcessTM, developed and patented by DST, is designed for the permanent sequestration of arsenic in a stable glass form. DST successfully demonstrated its Technology at laboratory, pilot and industrial scales. In these demonstrations, arsenical material was processedand generated vitrified arsenical glass, containing up to 20% arsenic while meeting the United States Environmental Protection Agency's (EPA) toxicity characterization leaching procedure (TCLP, Method 1311). The test work program has commenced in January 2021 and is expected to be completed within an 8-week period. About Dundee Sustainable Technologies, a corporation controlled by Dundee Corporation The Corporation is engaged in the development and commercialisation 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 mineralised material, concentrates and tailings, while stabilising contaminants such as arsenic, which could not otherwise be extracted or stabilised with conventional processes because of metallurgical issues or environmental considerations.