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<br /> <br />1313 Sherman St. Room 215 Denver, CO 80203 P (303) 866-3567 F (303) 832-8106 https://drms.colorado.gov <br />Jared Polis, Governor | Dan Gibbs, Executive Director | Michael A. Cunningham, Director <br />August 21, 2025 <br /> <br />Chris Gilbreath <br />Tri-State Generation and Transmission Association <br />1100 West 116th Avenue <br />Westminster, CO 80234 <br /> <br /> <br />Re: Colowyo Coal Mine (Permit No. C-1981-019) <br /> Permit Revision Application No. 5 (PR-5) <br /> PR-05 Post Mine Land Use Revision <br /> <br /> <br />Dear Mr. Gilbreath: <br /> <br />We have received your application to revise your permit to conduct coal mining in Colorado. Our <br />initial review indicates that all preliminary items required by the Colorado Surface Coal Mining <br />Reclamation Act, Section 34-33-101 et seq., C.R.S., have been submitted. Thus, your revision <br />application has been considered complete for the purposes of filing as of August 14, 2025. All <br />review and comment periods as provided in the Act and the Regulations initiate from this date of <br />filing. <br /> <br />Unless notification to the contrary accompanies this letter, the proposed newspaper advertisement <br />submitted with the application has been found to be satisfactory. You should commence publication <br />of this advertisement as specified in Rule 2.07.3(2) of the Regulations. Proof of the publication of <br />the advertisement must be filed with the Division no later than four weeks after the last publication <br />date. <br /> <br />Coincident with the publication, a copy of the revision application, less confidential items, must be <br />filed for public inspection with the appropriate public office as specified by you in the notice. Any <br />subsequent changes or additions to the application must also be made in this copy, at the same time <br />it is submitted to the Division. <br /> <br />The Division has requested a determination from the Office of Surface Mining Reclamation and <br />Enforcement (OSMRE) to ascertain if this revision application does not constitute a Mining Plan <br />Action and are awaiting their response. If OSMRE determines that this revision constitutes a Mine <br />Plan Action or the revision changes significantly during the course of the Division’s review, the <br />need for modification of your federal mine plan could be deemed necessary. In the event that <br />OSMRE determines that this revision constitutes a Mine Plan Action, the Division will notify you <br />that application materials must be forwarded to OSMRE.