Rook I Project

NexGen Energy Ltd. (NexGen) is proposing to develop an underground uranium mine on the Patterson Lake peninsula in the southwestern Athabasca Basin in northern Saskatchewan, approximately 155 km north of the town of LaLoche, SK. The proposed Rook l mine would produce up to 14 million kg of U3O8 annually for twenty-four years.

Under the Nuclear Safety and Control Act, NexGen's proposal requires approval and licensing by the Canadian Nuclear Safety Commission (CNSC). An environmental assessment (EA) conducted under the Canadian Environmental Assessment Act, 2012 is required, and an EA decision affirming that the proposed activities will not cause significant adverse environmental effects, before the CNSC can make a licensing decision on this proposal.

This project is also subject to the environmental assessment requirements of the Government of Saskatchewan.


This map is for illustrative purposes. The markers represent the approximate locations based on available data. More than one marker may be identified for a given assessment.

Latest update

May 25, 2020 - The CNSC is offering participant funding to assist Indigenous peoples, members of the public, and stakeholders in the review of the draft Environmental Impact Statement (EIS) for the Rook I project by NexGen Energy Ltd. (NexGen). Deadline for submitting a participant funding application: August 28, 2020.

Additional information is available here.


List all records


Canadian Nuclear Safety Commission
Nicole Frigault, Environmental Assessment Officer
280 Slater Street
P.O. Box 1046, Station B
Ottawa, Ontario K1P 5S9
Telephone: 613-995-7948 or 1-800-668-5284
Fax: 613-995-5086

  • Location

    • Patterson Lake (Saskatchewan)
  • Nature of Activity

    • Nuclear Energy
    • Mines and Minerals
  • Assessment Status

    In progress
  • Start Date

  • Proponent

    NexGen Energy Ltd.
  • Authorities

    • Canadian Nuclear Safety Commission
  • Assessment Type

    Environmental assessment under CEAA 2012
  • Reference Number


Nearby assessments

..within 200 kilometres
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