Homestake Mining Company Removal Site Evaluations
The EPA and Homestake Mining Company reached an agreement in September 2021 for the company to conduct Removal Site Evaluations (RSEs) at eight mines in the Ambrosia Lake region of the San Mateo Creek Basin. The RSEs identify the nature and extent of contamination from legacy uranium mining at the mines. The RSE report will assist EPA in determining if an Engineering Evaluation/Cost Analysis (EE/CA) for a non-time critical removal action is needed to address risk to human health and the environment.
Homestake Mining Company had a role in the operation of the 8 uranium mines over various periods from the 1960s through the 1990s. The eight mines, all in McKinley County, are:
- Dysart No. 1 (Section 11, Township 14 North, Range 10 West)
- Dysart No. 2 (Section 11, Township 14 North Range 10 West)
- Dysart No. 3 (aka Mary No. 1) (Section 11, Township 14 North, Range 10 West)
- Section 13 (Section 13, Township 13 North, Range 9 West)
- Section 15 (Section 15, Township 14 North, Range 9 West)
- Section 23 (Section 23, Township 14 North, Range 10 West)
- Section 25 (Section 25, Township 14 North, Range 10 West)
- Section 32 (Section 32, Township 14 North, Range 9 West)
Please click on the below map to see the locations.
Homestake Mining Company Removal Site Evaluations Map (jpg)
The document below describes EPA activity at the site. This Administrative Settlement Agreement and Order on Consent is entered into voluntarily by the United States Environmental Protection Agency and Homestake Mining Company. This Settlement Agreement provides for the performance of a removal site evaluations for eight mine sites formerly operated by Homestake Mining Company and the reimbursement of future oversight costs incurred by the United States.