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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 />September 12, 2025 <br />Chris Gilbreath <br />Tri-State Generation and Transmission Assoc., Inc <br />P.O. Box 33695 <br />Denver, CO 80233-0695 <br />Re: New Horizon Mine (Permit No. C-1981-008) <br />Permit Revision Application No. 10 (PR-10) <br />PR-10 Permit Boundary and Post Mine Land Use <br />Dear Mr. Gilbreath: <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 September 12, 2025. All <br />review and comment periods as provided in the Act and the Regulations initiate from this date of <br />filing. <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 />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 />The Division is currently reviewing your revision application to determine whether the items you <br />have submitted are adequate in terms of meeting the requirements of the Act and Regulations. <br />Additional information may be required, and in accordance with the provisions of Section <br />34-33-118(5) of the Act, you will be notified no later than November 11, 2025, should that be the <br />case. <br />If you have any questions, please contact me.