March 18: Abandoned Mine Could Release Hazardous Substances


Federal officials need to clean up an abandoned gold mine outside Yellowknife before it releases huge amounts of arsenic, asbestos, mercury, cyanide and other toxins. The Giant Mine closed in 2004, leaving about 237,000 tonnes of highly toxic, water-soluble arsenic trioxide on site. Although there’s a plan to remediate the site, engineers say the buildings and some of the underground caverns have deteriorated so badly that the cleanup must begin as soon as possible to contain various hazardous substances before they impact the environment and people.