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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman 6t., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832106 <br />October 17, 2006 <br />Hemy Bazbe <br />Mountain Coal Company, LLC <br />P.O. Box 591 <br />Somerset, CO 81434 <br />Re: West Elk Mine (Permit No. C-1980-007) <br />Technical Revision No. 107 (TR-107) <br />Pane125 <br />Dear Mr. Barbe: <br />COLORADO <br />DIVISION OF <br />RECLAMATION <br />MINING <br />SA ETY <br />Bill Owens <br />Govemar <br />Russell George <br />Executive Director <br />Ronald W. Cattany <br />Division Director <br />Natural Resource Trustee <br />We have completed a preliminary review of your application for TR-107. We have the following <br />comments. <br />1. If you believe the following statement is accurate, then please add it to the top of page <br />2.OS-lOS: "Except where noted otherwise, the following discussion of mining, geology, <br />and subsidence impacts for the Box Canyon Mining azea applies as well to pane125." <br />2. Please add to page 2.OS-1 I2 a description of landslide potential for Panel 25 mining. <br />3. Please add to page 2.05-114 a description of rockfall potential for Pane125 mining. <br />4. Please add to page 2.05-128 a prediction of the amount of subsidence for Pane125. <br />S. Please add to page 2.05-133 a prediction of the surface crack depth for Panel 2S. <br />6. Please incorporate Panel 25 mining into the discussion offracture-controlled drainages on <br />page 2.05-140. <br />7. Please add to page 2.OS-194 the potential for ponding and stream flow capture in <br />Sylvester Gulch from Pane125 mining. <br />8. Please add to the description of the Subsidence Monitoring Plan (which begins on page <br />2.05-162) the number of subsidence monitoring stations and the monitoring frequency for <br />Panel 2S mining. <br />9. Please show the locations of Panel 2S subsidence monitoring stations on either an <br />existing map or a new map in the permit application. <br />Office of Office of <br />Mined Land Reclamation Active and Inactive Mines <br />~l5gooa7 <br />{/TR - /a ~ <br />/'~/Le ~M ~S1~ ~~/I~ti/ <br />