Our collaboration with researchers at McGill University has resulted in a process that eliminates chlorine almost entirely from our gold refining process. The process is non-toxic, safer for our people and less energy-intensive. The traditional gold refining process has existed almost unchanged since the 1860s.
This breakthrough builds on previous work done in 2019 to reduce chlorine use in gold refining. At that time, the Mint introduced a new technology in the gold refinery process —acid-less separation (ALS)—reducing the need for chlorine gas by more than 50% in the Ottawa refinery.
Following lab scale testing and patent filing, the Mint will assess the feasibility of applying this technology to the production scale gold refining process.