Language selection


Proposed nuclear facility – Rook I

In February 2019, the CNSC received an initial project description from NexGen Energy Ltd. for its proposal to construct and operate a new underground uranium mine on the Patterson Lake peninsula in the southwestern Athabasca Basin in northern Saskatchewan, approximately 155 km north of the town of La Loche.

The proposed Rook I project includes underground and surface facilities to support the mining and processing of uranium ore. The main components include an underground mine, an onsite mill to process an average of 1,400 tonnes of ore per day, surface facilities to support the short- and long-term storage of waste rock and ore, an underground tailings management facility, water-handling infrastructure and an effluent treatment circuit, and additional infrastructure to support mining activities.

CNSC authorization is required in the form of a licence in order for the project to proceed. An environmental assessment is required under the Canadian Environmental Assessment Act, 2012 before the Commission can make a licensing decision.

Location: Patterson Lake peninsula, northern Saskatchewan
Applicant: NexGen Energy Ltd.
Facility type: Uranium mine
Status: Application under review
Regulatory review status: Regulatory review status for the Rook I project
Facility website: NexGen Energy Ltd.

Latest news

Commission proceedings

The Commission is an independent administrative tribunal set up at arm's length from government, without ties to the nuclear industry. Use the links below to find documents related to Commission meetings or hearings.

Search Commission documents

Regulatory actions

The CNSC posts regulatory enforcement actions taken to protect the health, safety and security of Canadians and the environment. Use the links below to find out more about any orders or penalties that have been placed on this licensee, if any.

  • No recent regulatory actions

View all regulatory actions


Licensees must report events and incidents involving licensed activities that could impact the health, safety and security of Canadians and the environment to the CNSC. Use the links below to find any information provided by this licensee, as well as other public disclosures made by licensees.

  • No disclosures

View all nuclear-related events

Protecting Canadians and the environment


An environmental assessment decision affirming that the proposed activities will not cause significant adverse environmental effects is required before the Commission can make a licensing decision on this proposal.

The CNSC uses information provided by licensees and applicants to create our own reports assessing the environmental effects of nuclear facilities or licensed activities.

Health and safety

The CNSC oversees licensee emergency planning and works with other levels of government to ensure the health and safety of Canadians. We also conduct and review health studies on various areas associated with the production, possession or use of nuclear substances.

Page details

Date modified: