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Cody Field Office
Release Date: 05/21/12
Contacts: Sarah Beckwith    

BLM Cody Releases EA for Bentonite Mining

The Bureau of Land Management (BLM) Cody Field Office announces the availability of an environmental assessment (EA) which analyzes a proposed bentonite mining project expansion located approximately 10 miles northeast of Greybull, Wyo., in Big Horn County.

M-I Swaco, L.L.C. (M-I) proposes to expand its mining operations by approximately 475 acres on federal land. Up to about 30 acres per year would be disturbed over the 15-20 year life of the mine.

The EA has been prepared to analyze the impacts of the proposed project. It is available for public review and comment by visiting the BLM website at The EA and the plan of operations modification/right-of-way application submitted by M-I is also available for review at the Cody Field Office, 1002 Blackburn Street in Cody.

The public comment period runs from May 21 through June 19, 2012. Comments may be emailed to; please include "M-I Upper Rim Plan" in the subject line. Comments may also be mailed to AFM Minerals and Lands, BLM-Cody Field Office, 1002 Blackburn Street, Cody, WY, 82414.

Before including your address, phone number, e-mail address or other personal identifying information in your comment, you should be aware that your entire comment – including your personal identifying information – may be made publicly available at any time. While you can ask us in your comment to withhold your personal identifying information from public review, we cannot guarantee that we will be able to do so.

For more information, please contact BLM Geologist Gretchen Hurley at 307-578-5900 or

The BLM manages more than 245 million acres of public land, the most of any Federal agency. This land, known as the National System of Public Lands, is primarily located in 12 Western states, including Alaska. The BLM also administers 700 million acres of sub-surface mineral estate throughout the nation. The BLM's mission is to sustain the health, diversity, and productivity of America’s public lands for the use and enjoyment of present and future generations. In Fiscal Year 2015, the BLM generated $4.1 billion in receipts from activities occurring on public lands.

Cody Field Office   1002 Blackburn Street      Cody, WY 82414  

Last updated: 05-21-2012