Third national assessment of environmental effects monitoring information from metal mines subject to the Metal Mining Effluent Regulations / Industrial Sectors, Chemicals and Waste and Environmental... : En14-64/2016E-PDF

The Metal Mining Effluent Regulations (MMER) came into force in 2002 under the Fisheries Act. They prescribe end-of-pipe (discharge) limits for specified substances, and provide a national standard that is intended to protect fish, fish habitat and the use of fisheries resources. The metal mining sector is achieving over 95% compliance with the prescribed discharge limits and meeting the requirement that effluent not be acutely lethal to rainbow trout (Environment Canada 2015). In addition to complying with end-of-pipe limits, Canadian mines subject to the MMER are required to conduct environmental effects monitoring (EEM) studies of the potential effects of mine effluent on the aquatic environment. Information obtained through EEM supports the evaluation of the effectiveness of the Regulations in protecting the aquatic environment and of current and future pollution prevention and control technologies, practices and programs within the mining sector. The purpose of this report is to present the main findings of the EEM studies conducted by mines across Canada.

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