Canadian Large Projects

Kerr-Sulphurets-Mitchell (KSM)

  • Project Proponent is Seabridge Gold Inc.


  • Proposed open pit copper and gold project located approximately 20 miles from Alaska in the Unuk Watershed. If constructed, mining would occur in the Mitchell and Sulphurets watersheds, which drain to the transboundary Unuk River. The waste rock disposal areas, water storage facility, and water treatment facility would also be constructed as part of the mine site. Milling would occur outside of the Unuk Watershed and the mill tailings would be disposed in the tailings management facility located in the Teigen and Treaty Watersheds, which drain to the non-transboundary Bell-Irving and Nass rivers.


  • Provincial Environmental Assessment
  • • The provincial environmental assessment period administered by the B.C. Environmental Assessment Office (EAO) started on August 12, 2013 and concluded with the issuance of the provincial environmental assessment certificate on July 29, 2014. Subject matter experts from the Alaska Departments of Natural Resources (ADNR), Fish and Game (ADF&G), and Environmental Conservation (ADEC) participate in the environmental assessment process as members of technical working groups comprised of provincial, federal Canadian, federal U.S., and Canadian First Nation representatives.

    • The Environmental Assessment Certificate for the KSM Project, along with all supporting review documentation, may be found here.

    • State of Alaska comments to the EAO ( January 24, 2014)
  • Federal Canadian Environmental Assessment
  • • The federal Canadian environmental assessment process is administered by the Canadian Environmental Assessment Agency (CEAA) and runs concurrently with the provincial assessment. Subject matter experts from the ADNR, ADF&G, and ADEC participated in the federal Canadian environmental assessment process as members of the technical working group comprised of provincial, federal Canadian, federal U.S., and Canadian First Nation representatives.

    • The federal environmental review process concluded on December 19, 2014 with an approval by the Minister of the Environment.

    • State of Alaska comments to the CEAA ( August 20, 2014)

    • CEAA response to State of Alaska ( December 19, 2014)

    • Documents related to the federal Canadian Environmental Assessment process for the KSM Project may be found here.