As previously reported (DST Press Release dated September 13, 2017 and DST Press Release dated May 26, 2020), a State of Knowledge Review report prepared by Arcadis Canada Inc., released on September 11, 2017 on behalf of GMOB concluded that vitrification "ranked first in the scoring matrix for stabilization/treatment methods" based on the potential for long-term stability, moderate overall costs, and potential for gold recovery. GMOB is currently in the process of verifying the accuracy of that initial assessment.

The GlassLock Process is designed for the sequestration of arsenic in a stable glass form. DST has successfully demonstrated its Technology at laboratory, pilot and industrial level, where arsenical material was processed to generate 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).

DST is also delighted to announce the appointment of Mr. Jean-Philippe Mai as Executive Vice-President. Mr. Mai has been with the Corporation since 2013 and most recently as Vice-President Business Development since May 2016. He has been a key player in the commercialisation efforts of the Corporation's technologies and the development of DST's technical services. Mr. Mai holds a Bachelor of Science in Geology from the University of Quebec in Montreal ("UQAM") and has a vast experience in mining projects in Canada, Australia and South America. Mr. Mai is a Professional Geologist and a member of L'ordre des géologues du Québec.

The gold ore at the Giant Mine is co-located with arsenopyrite, an arsenic-bearing mineral. Initially released to the atmosphere, arsenic trioxide dust mixture was generated as a by-product of the milling process. Beginning in 1952 the arsenic trioxide dust mixture was precipitated, collected in baghouses and stored underground on-site in purpose-built vaults, or in previously mined out [underground] chambers (stopes). Over approximately 50 years of operation, 237,000 tonnes of arsenic trioxide dust were generated and stored on site. The dust is, on average, approximately 60% arsenic by weight. Arsenic trioxide is water soluble and poses a risk to both people and the environment through transport to local water bodies such as Baker Creek and Great Slave Lake.

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.

FORWARD LOOKING STATEMENTS: This press release contains forward-looking statements that address future events and conditions, which are subject to various risks and uncertainties. Actual results could differ materially from those anticipated in such forward-looking statements as a result of numerous factors, some of which may be beyond the Corporation's control. These factors include general market and industry conditions, risks related to continuous operations and to commercialization of new technologies and other risks disclosed in the Corporation's filings with Canadian Securities Regulators.

Forward-looking statements are based on the expectations and opinions of the Corporation's management on the date the statements are made. The assumptions used in the preparation of such statements, although considered reasonable at the time of preparation, may prove to be imprecise and, as such, undue reliance should not be placed on forward-looking statements. The Corporation expressly disclaims any intention or obligation to update or revise any forward-looking statements whether as a result of new information, future events or otherwise, except as required by applicable law.