About Us


Who We Are:

Denison Environmental Services (DES), a division of Denison Mines Inc., is a trusted industry leader in long-term care and maintenance for closed mine sites.

As mining regulations and environmental awareness evolved over the last several decades, a need for planning closure procedures for these mines also developed - a practice that has become a mandatory part of the opening of new mines. Denison Environmental Services was created to address these needs and requirements.

DES is headquartered in Elliot Lake, ON, with satellite offices in Whitehorse, YT, and Rouyn-Noranda, QC. DES Elliot Lake is ISO 9001:2015 certified, with a proven team of experienced project staff who will work with you to accommodate your specific closure and monitoring needs while maintaining compliance with the strictest of standards.

What We Do:

Since 1997, DES has met the needs of the mining community by providing closure, remediation, monitoring, care & maintenance and demolition services to a variety of types of mines, including uranium, iron ore, gold ore, nickel, copper, silver, lead, and zinc.

With offices in Ontario, the Yukon Territory, and Quebec, we continue to service care and maintenance needs in these jurisdictions. In addition, DES has successfully completed contracts with governments and private firms in Newfoundland and Labrador, New Brunswick, Nova Scotia, Quebec, Ontario, Manitoba, Saskatchewan, British Columbia, Northwest Territory, Yukon Territory and Alaska. We have a world-wide network of contacts to assist with asset valuation, sales, and procurement. Our years of experience in long-term care and maintenance procedures ensure compliance with regulatory agencies and peace of mind for you, the mine site owner.

Our hands-on management provides the leadership you need to achieve the results you expect.