Evolution at Laronde mine of the biological treatment of thiocyanate.

CIM Montreal 2015
Patrick Laporte (Agnico-Eagle Mines Limited), Yanick Letourneau (Agnico-Eagle Mines Limited)
Mine LaRonde of Agnico Eagle Inc. operates a polymetallic gold mine in Abitibi which is located in Northwestern Quebec. Due to a toxicity problem at the final effluent, an initiative was taken to shut the final effluent. During four years, time necessary to find a solution, no water went to the environment and over 5 million cubic meters of water accumulated within the tailing pond.
The high concentration of thiocyanate (SCN) was the problem; only a few treatments were able to treat that element at the required flow. After an analysis of the various options, a biological treatment was selected.
This presentation will illustrate the path of knowledge acquired during the last 10 years of water treatment operation at LaRonde mine along with various challenges the mining industry faces.
Keywords: mining effluent, biotecnologie, Waste water treatment
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