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Metal and diamond mining effluent

Environment and Climate Change Canada is responsible for the pollution prevention provisions of the Fisheries Act and its associated regulations, such as the Metal and Diamond Mining Effluent Regulations. Owners and operators of metal and diamond mines in Canada may be subject to the Regulations.

On December 1, 2021, new amendments to the Regulations came into force. These requirements are in addition to the previous amendments of June 1, 2021. For more information, visit the Overview of the Regulations webpage.

Services and information

Overview of the Regulations

Information for mine owners and operators. Overview of reporting requirements, new requirements as of 2021, information about final discharge points and other resources.

Reporting through the Mine Effluent Reporting System

Information for owners and operators about reporting under the Regulations.

Laws and Regulations

Read the Regulations, review recent amendments and obtain information about planned changes and consultations.

Environmental effects monitoring

The Regulations require mines to conduct studies to assess if their effluent is having an effect on fish, fish habitat and use of fisheries resources. Find out more about these studies and reporting to the Environmental Effects Monitoring Electronic Reporting System.

Data and annual reports

Find out more about the information reported by owners and operators of mines under the Regulations.

Tailings impoundment areas

Authorization to deposit mine waste into a tailings impoundment area may require a regulatory amendment to list the water frequented by fish on Schedule 2 of the Regulations.

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