Dundee Tech, Radis­son tests re­move 92% of As from Au

Stockwatch Daily - - MINES & METALS - Mr. Brian Howlett re­ports

DUNDEE SUS­TAIN­ABLE Tech­nolo­gies Inc. suc­cess­fully re­moved 92.2 per cent of the ar­senic con­tent and demon­strated, at the pi­lot scale, that the re­frac­tory par­cel of O’Brien gold ma­te­rial can un­dergo a pre­treat­ment to re­move ar­senic and cre­ate a min­eral con­cen­trate with lev­els of ar­senic that are ac­cept­able to the mar­ket and tra­di­tional gold re­cov­ery cir­cuits.

In Fe­bru­ary 2017, DST re­ceived five tonnes of rep­re­sen­ta­tive ma­te­rial from the O’Brien gold project. The mate rial was crushed an d ground. The free gold was re­cov­ered by gravime­try and the bal­ance of the ma­te­rial was con­cen­trated through flota­tion. This ap­proach mir­rored Radis­son’s planned re­cov­ery cir­cuit in the pre­lim­i­nary eco­nomic as­sess­ment. DST gen­er­ated a gold con­cen­trate which con­tained 109 grams per tonne of gold, 11.6 per cent ar­senic and 19.9 per cent sul­phur. Us­ing’s DST ther­mal de­com­po­si­tion in an oxy­gen-de­prived-en­vi­ron­ment ap­proach, the ar­senic con­tent was re­duced by 92 per cent, with no gold losses while leav­ing a sul­phur con­tent of eight per cent.

The ar­senic de­pleted con­cen­trate was treated for gold ex­trac­tion us­ing both DST’s patented chlo­ri­na­tion tech­nol­ogy and cyanida­tion where gold re­cov­er­ies of 94.6 per cent and 93.5 per cent were achieved, re­spec­tively.

The process was over­seen by an in­de­pen­dent con­sult­ing firm so that the pi­lot­ing test pro­gram and re­sults could be in­cluded in Radis­son’s fu­ture pre­lim­i­nary eco­nomic as­sess­ment.

Mario Bouchard, pres­i­dent of Radis­son com­mented: “For Radis­son the DST’s two new pro­cesses tested, neu­tral­iza­tion of the ar­senic by vit­ri­fi­ca­tion and re­cov­ery of the gold by chlo­ri­na­tion, demon­strate eco­nom­i­cal and en­vi­ron­men­tal ad van tages. We are pleased to col­lab­o­rate with DST and we will con­sider se­ri­ously those two in­no­va­tions in our devel­op­ment plans.”

“These ex­cel­lent pi­lot­ing re­sults demon­strate the ef­fi­ciency of the ar­senopy­rite treat­ment ap­proach de­vel­oped by DST and, com­bined with the com­pany’s ar­senic sta­bi­liza­tion tech­nol­ogy, pro­vides a cost-ef­fec­tive al­ter­na­tive to POX and off­sets mar­ket penal­ties for com­plex ar­senopy­rite bear­ing de­posits.” said Brian Howlett, DST’s pres­i­dent and chief ex­ec­u­tive of­fi­cer.

The com­pany con­tin­ues the com­mer­cial­iza­tion of its cyanide-free gold ex­trac­tion and ar­senic sta­bi­liza­tion tech­nolo­gies. DST also pro­vides its tech­ni­cal ex­per­tise and fa­cil­i­ties to com­pa­nies wishing to fur­ther eval­u­ate the devel­op­ment of their projects us­ing the cor­po­ra­tion lab­o­ra­tory, pi­lot­ing and/or industrial demon­stra­tion fa­cil­i­ties on spe­cific projects in need of vi­able pro­cess­ing ca­pac­i­ties, and to ini­ti­ate engi­neer­ing stud­ies re­quired for an industrial im­ple­men­ta­tion.

About Dundee Sus­tain­able Tech­nolo­gies Inc., a com­pany con­trolled by Dundee Cor­po­ra­tion

The cor­po­ra­tion is en­gaged in the devel­op­ment and com­mer­cial­iza­tion 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 min­er­al­ized ma­te­rial, con­cen­trates and tail­ings, while sta­bi­liz­ing con­tam­i­nants such as ar­senic, which could not oth­er­wise be ex­tracted or sta­bi­lized with con­ven­tional pro­cesses be­cause of met­al­lur­gi­cal is­sues or en­vi­ron­men­tal con­sid­er­a­tions. DST has filed, pub­lished and was granted patents for these pro­cesses in sev­eral coun­tries.

We seek Safe Har­bor.

Brahm Marvin Gelfand, Mark E Good­man, Nathan Ed­ward Good­man, Brian Michael Howlett, Mario Ja­cob, Hu­bert Romeo Mar­leau, Ge­off Mor­phy

(DST) Shares: 297,090,816

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