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<br /> <br />November 26, 2025 <br /> <br />Jessica Wilczek <br />Core Natural Resources <br />5174 Highway 133 <br />Somerset, CO 81434 <br /> <br />Re: West Elk Mine (Permit No. C-1980-007) <br /> Minor Revision No. 492 (MR- 492) <br /> With Minor Revision No. 492 (MR-492), Mountain Coal Company, LLC seeks to <br />update Exhibit 1 - Officers and Directors for Core Natural Resources, Inc. <br /> <br />Dear Sir or Madam: <br /> <br />We have received your minor revision application to revise your permit to conduct coal mining in <br />Colorado. Our initial review indicates that all preliminary items required by the Colorado Surface <br />Coal Mining Reclamation Act, Section 34-33-101 et seq., C.R.S., have been submitted. Thus, your <br />application has been considered complete for the purposes of filing as of November 26, 2025. All <br />review and comment periods as provided in the Act and the Regulations initiate from this date of <br />filing. <br /> <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. The <br />Division will either issue a decision or inform you of adequacy issues regarding the application on or <br />before December 6, 2025. <br /> <br />If you have any questions, please contact me. <br />