Cyanide is used in gold mines and mills as part of the extraction process to remove gold from ore. Cyanide is highly toxic by all routes of exposure and may rapidly impair the nervous, cardiovascular and respiratory systems leading to death within minutes to hours.
Gold mines and mills have historically used a Cyanide Antidote Kit (CAK) that contains three components: amyl nitrite, sodium nitrite, and sodium thiosulfate. Amyl Nitrite was discontinued in February 2012 and the traditional CAK is no longer available in Canada. As the traditional kits expire throughout the year, gold mines and mills will need to replace them with the only available cyanide antidote kit on the Canadian market, Merck’s Cyanokit.
http://www.healthandsafetyontario.ca/WSN/News/Traditional-Cyanide-antidote-kit-now-off-the-marke.aspx
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