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Events Reporting: Closed and decommissioned uranium mines and mills


Denison Mines Corp.

Date of event: May 24, 2016

Denison Mine, Quirke Lake, Ontario

In accordance with the regulations and licence conditions, Denison Mines Corp. informed the CNSC that a small bush fire had occurred near its licensed area. The Elliot Lake Fire Department and Ontario Ministry of Natural Resources and Forestry responded and extinguished the fire. The fire had no radiological impact, nor did it cause any impact to the health and safety of workers or the public.

Visit Denison Mines Corp. website for more information.


Ontario Ministry of Environment and Climate Change

Date of event: April 29, 2015

Deloro closed mine site, Deloro, Ontario

The CNSC was informed by the Ontario Ministry of Environment and Climate Change (MOECC), in accordance with the regulations and their licence conditions, of an event at the closed Deloro mine site. As a result of cleanup work at the site, there was an unplanned release of construction wastewater due to the collapse of a temporary aqua barrier. The released wastewater was non-radiological and no impact to the environment is anticipated as a result of this event. A CNSC inspector and staff visited the site and were not satisfied with the MOECC’s contingency plans to deal with the stability of aqua barriers. On June 5, the CNSC announced that it had issued an order to the MOECC to prevent a similar occurrence at the closed Deloro mine site. This event will be discussed at a public Commission meeting on June 17, 2015.

Read the MOECC’s letter to key community stakeholders to learn more about the event and visit the MOECC website for information about the Deloro mine cleanup project.

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