Tag Archives: GlassLock

Dundee’s GlassLock Process engineers an opening at West Africa gold mine

Dundee Sustainable Technologies (DST) and its proprietary GlassLock Process™ is to help a West Africa mine stabilise legacy arsenic-bearing material at its gold operation following a new mandate agreement.

The mandate agreement, entered on June 8, consists of delivering an engineering package for a plant using DST’s GlassLock Process. It follows a preliminary metallurgical test program with the same customer from back in the March quarter.

This program saw over 40 kg of arsenic- and gold-bearing material received at DST’s technical facilities in Canada, whereby DST successfully combined gold recovery with the stabilisation of arsenic using GlassLock, it said.

A glass product containing over 15% arsenic was generated and successfully met the requirements of the United States Environmental Protection Agency’s toxicity characterisation leaching procedure (TCLP, Method 1311), DST said.

“As a result, the customer awarded the engineering mandate to DST to perform process optimisation and an engineering study at the prefeasibility (+/-25%) level,” it said. “The agreement includes engineering fees in the amount of C$101,000 ($74,436) to be paid to DST for this work as per its business plan to generate revenues for the corporation while the technology is progressing toward implementation.”

The final report is due at the beginning of September 2020, DST said.

Back in May, DST announced it had entered into a commercial agreement to provide engineering services to a gold and copper producer for a full-scale plant of its GlassLock Process as part of a C$600,000 Class 4 engineering package.

Since the construction of its pilot plant in 2016, DST has continued to demonstrate the validity of its technology, moving from pilot level to the industrial demonstration scale, where arsenical material was processed to generate vitrified arsenical glass, containing up to 20% arsenic while meeting the TCLP Method 1311.

“GlassLock is becoming an effective and cost attractive technique to segregate arsenic and is therefore opening new opportunities for arsenic-bearing precious metals deposits, concentrates or contaminated sites considered to contain too much arsenic to be exploited,” the company said.

This agreement is another major achievement in DST’s commercialisation efforts, it added.

Dundee Sustainable Technologies makes CLEVR, GlassLock process progress with China

Dundee Sustainable Technologies says it has received a mandate from a Chinese customer to continue testing of the cyanide alternative CLEVR Process™.

The company has received a 30-kg sample of mineralised material from the customer and a payment for this work, DST said, explaining that the goal of the work is to demonstrate its proprietary CLEVR Process can extract gold at a rate of 95% or better.

Brian Howlett, President and CEO, said: “Management of DST is very excited to be developing our CLEVR Process technology into China at this time. China controls a key portion of the gold and base metals processing capacity in the world and will be a key market going forward for our technologies.”

DST, back in December, said it had completed analysis of the samples from this customer and had been able to increase recovery of the gold from the customer’s concentrate from 71% using cyanide to over 90% at a lab scale using its technology.

CLEVR uses no cyanide, produces no toxic liquid or gaseous effluent, and the solid residues are inert, stable and non-acid generating, according to DST.

DST Management has also submitted a 5-kg sample of glass from its GlassLock Process™ to Chinese authorities for regulatory testing with the goal of classifying the glass as non-hazardous waste product suitable for disposal in the Chinese market.

GlassLock is a patented process for the sequestration and stabilisation of the arsenic often associated with copper, gold, silver or polymetallic deposits.