Formerly Alexco Environmental Group (AEG) and Contango Strategies

Ensero Solutions (Ensero) is working with Colorado Legacy Land LLC (CLL) on the Remedial Investigation/Feasibility Study (RI/FS) of the Former Cañon City Mill Remediation Project and Lincoln Park Superfund Site (Site) under the oversight of the Colorado Department of Public Health and Environment (CDPHE) and the U.S. Environmental Protection Agency (EPA). A Community Advisory Group (CAG), consisting of local citizens, is also providing input to the RI/FS process for which there are regularly scheduled meetings for their input. The Site is located south of Cañon City in Fremont County, Colorado, and includes the Cotter Corporation (Cotter) uranium mill and areas of mill-associated contamination, including the Lincoln Park community near the mill. CLL acquired Cotter’s liability for remediation in 2018 and is providing a defined positive path forward for remediation.

The former uranium mill currently consists of a mill area, two impoundments (approximately 100 acres), ore storage pads, and a few office/lab/maintenance trailers, on approximately 2,500 acres adjacent to Cañon City and the unincorporated community of Lincoln Park. The mill was licensed by CDPHE under a Radioactive Materials License (RML) and the mill was operated continuously from 1958 until 1979, and intermittently since then; the last commercial milling operation was conducted in 2006. The site was owned by Cotter until early 2018. Past milling operations have contaminated soil and groundwater in the surrounding areas. Therefore, the former uranium mill and the adjacent Lincoln Park area were added to the National Priorities List in 1984 as the Lincoln Park Superfund Site by EPA. In 2012, Cotter officially announced decommissioning of the site and requested for termination of the RML. As a result, the RML was amended in 2014 and changed from a milling license to a decommissioning license; this amendment removed the authorization for any further source material processing. On March 9, 2018, the RML was transferred from Cotter to CLL.

The RI/FS process includes evaluating existing data from decades of investigations; evaluating potential effects to groundwater, soil, air, sediments, surface water; conducting risk assessments in conjunction with EPA for human health and the environment; and evaluating remedial alternatives that best fit the future of the Site and local area. A draft RI report is currently being prepared for submittal to EPA for review after which a work plan will be developed to conduct field investigative activities for the collection of data necessary to evaluate the best remedial alternative.


Mill Facilities before demolition

Aerial view of mill circa 2006
Aerial view of mill circa 2020