Metal and Diamond Mining Effluent Regulations
These regulations authorize the deposit of effluent from metal and diamond mines into water frequented by fish under subsection 36(3) of the Fisheries Act. They help protect Canada’s lakes and rivers by setting strict limits on the quality of effluent that can be discharged and by requiring effluent testing, monitoring and reporting.
About the Regulations
Additional information
- Amendments: Metal and Diamond Mining Effluent Regulations
- Metal and diamond mining effluent
- Fisheries Act Registry
Related acts
- Fisheries Act
- Canadian Environmental Protection Act, 1999
- Canadian Navigable Waters Act
- Impact Assessment Act
Related institutions
- Environment and Climate Change Canada
- Fisheries and Oceans Canada
- Transport Canada
- Impact Assessment Agency of Canada
Contact us
If you require further assistance or have any questions, please contact Environment and Climate Change Canada.
Email: mdmer-remmmd@ec.gc.ca
Read the Regulations
Full document: HTML (accessibility buttons available), XML [277 KB], PDF [652 KB]
Enabling Act: Fisheries Act
Regulatory change
Recent amendments
2026
2025
- Amending the Metal and Diamond Mining Effluent Regulations: SOR/2025-71 (Meliadine Project)
- Amending the Metal and Diamond Mining Effluent Regulations: SOR/2025-72 (Macassa Project)
- Amending the Metal and Diamond Effluent Mining Regulations: SOR/2025-138 (Goldboro Project)
- Amending the Metal and Diamond Effluent Mining Regulations: SOR/2025-139 (Red Lake Project)
2024
- Amending the Metal and Diamond Mining Effluent Regulations: SOR/2024-162 (Marathon Project)
- Amending the Metal and Diamond Mining Effluent Regulations: SOR/2024-145 (Bloom Lake Project)
- Amending the Metal and Diamond Mining Effluent Regulations: SOR/2024-149 (Dome Mine Project)
- Amending the Metal and Diamond Mining Effluent Regulations: SOR/2024-124 (West Detour Project)
2023
- Amending the Metal and Diamond Mining Effluent Regulations: SOR/2023-122 (Blackwater Project)
2022
- Amending the Metal and Diamond Mining Effluent Regulations: SOR/2022-159 (Mont-Wright Mining Project (Dyno Basin))
- Amending the Metal and Diamond Mining Effluent Regulation: SOR/2022-23 (Ekati Mine Project and amendments to subsection 27.1(3) on financial guarantee requirements)
2021
2020
- Amending the Metal and Diamond Mining Effluent Regulations: SOR/2020-132 (Côté Gold Project)
- Amending the Metal and Diamond Mining Effluent Regulations: SOR/2020-131 (Whale Tail Pit Expansion Project)
- Amending the Metal and Diamond Mining Effluent Regulations: SOR/2020-110 (Hardrock Project)
- Amending the Metal and Diamond Mining Effluent Regulations: SOR/2020-109 (Back River Project)
- Amending the Metal and Diamond Mining Effluent Regulations: SOR/2020-108 (Magino Project)
2019
2018
- Amending the Metal and Diamond Mining Effluent Regulations: SOR/2018-280 (Mont-Wright Project)
- Amending the Metal and Diamond Mining Effluent Regulations: SOR/2018-219 (Young-Davidson Project)
- Amending the Metal Mining Effluent Regulations: SOR/2018-99 (10-Year review)
Planned changes and consultations
Open consultations
No open consultation.
Related forward regulatory plan
Past consultations
2026
- Share your ideas: Amendments to the Metal and Diamond Mining Effluent Regulations for the Great Bear Gold Project
- Share your ideas: Amendments to the Metal and Diamond Mining Effluent Regulations for the IOC Western Hillside Project
- Share your ideas : Amendments to the Metal and Diamond Mining Effluent Regulations for the Scully Mine Tailings Expansion Project
2024
- Share your ideas: Amendments to the Metal and Diamond Mining Effluent Regulations for the Goldboro Gold Project
- Share your ideas: Amendments to the Metal and Diamond Mining Effluent Regulations for the Red Lake Operation Project
2023
- Share your ideas: Amendments to the Metal and Diamond Mining Effluent Regulations for the Meliadine Mine
- Share your ideas: Amendments to the Metal and Diamond Mining Effluent Regulations for the Macassa Project
- Share your ideas: Amendments to the Metal and Diamond Mining Effluent Regulations for the Marathon Palladium Project
- Share your ideas: Amendments to the Metal and Diamond Mining Effluent Regulations for the Bloom Lake Project
- Share your ideas: Amendments to the Metal and Diamond Mining Effluent Regulations for the Lac des Iles Mine Expansion Project
- Share your ideas: Amendments to the Metal and Diamond Mining Effluent Regulations for the Dome Mine
2022
2021
- Share ideas: Mont-Wright Mining Project (Dyno Basin)
- Share and view ideas: Ekati Mine Project
- Share your ideas: Blackwater Project
2020
- Back River Mine Project
- Côté Gold Mine Project
- Hardrock Mine Project
- Magino Gold Mine Project
- Whale Tail Pit Expansion Project