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PUBLIC NOTICE
American Colloid Company
WY 620 – Sunnyside Amendment
The American Colloid Company, a Minerals Technologies Incorporated Company of Bethlehem, PA has applied for a mining permit amendment from the Land Quality Division of the Department of Environmental Quality for the State of Wyoming. The mining permit amendment area for the mining of bentonite will be located in: Sections 32 and 33 of T58N R62W and Sections 3, 4, 5, 9, 10, 11, and 15 of T57N R62W all within Crook County, Wyoming. The mine permit amendment area referred to as Sunnyside is located directly north of State Highway 212 stretching approximately seven to eleven miles northwest of Colony, Wyoming. The proposed operation is scheduled to begin February 2026 and is estimated to continue until 2041.
Information regarding this application may be reviewed in the Office of the Land Quality Division of the Department of Environmental Quality in Cheyenne and Sheridan or the Crook County Clerk’s Office, in Sundance, Wyoming. Written objections to the proposed mining operation must be received by the Administrator of the Land Quality Division, Department of Environmental Quality, 200 W. 17th Street, Suite 10, Cheyenne, WY 82002 before the close of business on January 25, 2026. Objections may also be submitted by the same deadline via the Land Quality Division’s electronic comment portal at http://lq.wyomingdeq.commentinput.com/. The Director shall issue a final written decision on the application within thirty days after the deadline to file objections. The applicant or objector may appeal the Director’s written decision to the Environmental Quality Council (EQC). If a hearing is held, the EQC shall issue findings of fact and a decision within sixty days after the final hearing. The hearing shall be conducted as a contested case in accordance with the Wyoming Administrative Procedure Act (W.S. §16-3-101 through §16-3-115), and the right of judicial review shall be afforded as provided in that Act. All parties as given in W.S. §35-11-406(j) will be mailed a copy of this notice. The Wyoming Oil and Gas Conservation Commission will be mailed a copy of the application mine plan map as required in W.S. §35-11-406(j).
Para espanol, visite deq.wyoming.gov. Americans with Disabilities Act: special assistance or alternative formats will be made available upon request for individuals with disabilities. Please provide at least fourteen (14) days before the close of the public comment period for such requests.
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