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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 21 S <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: 1303) 832-8706 <br />March 19, 2002 <br />Mr. Elmer Bentley <br />Lorencito Coal Company <br />20500 Highway 12 <br />Weston, CO 81091 <br />RE: Blast monitoring, Lorencito Canyon Mine, #C-96-084 <br />Mr. Bentley: <br />~~ <br />DIVISION OF <br />MINERALS <br />GEOLOGY <br />RECLAMATION <br />MIN ING•SA FETY <br />Bill Owens <br />Gavemor <br />Greg E. Walther <br />Enecutive Director <br />Michael B. Long <br />Division Director <br />Please find enclosed an inspection report written following the conclusion of the most <br />recent blast monitoring of the Lorencito Canyon mine. This monitoring was conducted <br />from January 22 to February 19 of this year. The Division requested the assistance of <br />the Office of Surface Mining, who is the federal oversight agency to the Division of <br />Minerals and Geology. <br />While each blast is a discrete and separate event, monitoring conducted over this time <br />period indicates airblast and ground response from blast conducted during this time <br />period to be minimal and well within regulated limits. This monitoring was conducted <br />confidentially and the mine was not notified until the monitoring was completed. <br />The Division may conduct monitoring periodically in the future to ensure compliance <br />with the regulated limits for airblast and ground vibration. <br />Please contact me if you have any questions. <br />Sinc ely, ~~~ <br />Ken Gorham <br />Environmental Protection Specialist II <br />Enclosure (1) <br />