Dundee Sustainable Technologies: Patent Granted and Notice of Allowance

MONTREAL, QUEBEC, April 23, 2015 – Dundee Sustainable Technologies Inc. (“DST” or the “Corporation”) (CSE: DST) is pleased to announce that the United States Patent and Trademark Office has granted DST a patent (number US 8,998,790) for the stabilization of arsenic in a stable glass form and has issued a notice of allowance for DST patent application (number 13/418,863) pertaining to gold extraction with halogens, using hypohalites.

A method for the sequestration of arsenic

This method uses chemicals at a lower cost to produce a more stable product than current industrial practices. DST has filed patent applications for this method in several countries. This approach to stabilize arsenic is becoming an attractive technique to segregate the toxic material and is therefore opening opportunities for deposits or concentrates considered to contain too much arsenic to be exploited using conventional approaches. DST has the exclusivity for the use of the technology until 2033.

A method and a system for gold extraction with halogens

This patent is related to a simplified recycling process of the halogens and their re-introduction in the process loop. The same patent has already been granted in Canada and applications are pending in several Latin America countries. DST has the exclusivity for the use of the technology until 2032. This patent is part of a group of four different patents/applications covering all aspects of the gold extraction and recovery technology.