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<br /> <br /> <br /> <br /> <br /> <br />June 17, 2025 <br /> <br /> <br />Julie Mikulas <br />Martin Marietta Materials, Inc. <br />1800 N. Taft Hill Road <br />Fort Collins, CO 80521 <br /> <br /> <br />Re: Windsor East Mine - File No. M-2022-042 <br /> Martin Marietta Materials, Inc. <br /> Technical Revision (TR-3) <br /> Technical Revision for Liner Designs <br /> <br />Dear Julie Mikulas: <br /> <br />On June 17, 2025 the Division of Reclamation, Mining and Safety concluded its review of the <br />Technical Revision application submitted to the Division on June 16, 2025, addressing the following: <br /> <br />As committed to with the original application, liner designs are to be submitted as a technical revision <br />once designs are completed. <br /> <br />The decision reached by the Division is: approve. <br /> <br />The terms of Technical Revision No. 3 approved by the Division are hereby incorporated into Permit <br />No. M-2022-042. All other conditions and requirements of Permit No. M-2022-042 remain in full <br />force and effect. <br /> <br /> <br />Bond Held: $2,300,000.00 <br />Prior Liability: $2,300,000.00 <br />Change in Liability: $0.00 <br />Revised Liability: $2,300,000.00 <br />Prior Permit Acreage: 150.30 <br />Change in Permit Acreage: 0.00 <br />Revised Permit Acreage: 150.30 <br />Prior Affected Acreage: 150.30 <br />Change in Affected Acreage: 0.00 <br />Revised Affected Acreage: 150.30 <br />