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~` . -- March 4, 2003 <br />Barbe, Henry <br />Page 1 of 1 <br />From: Toni Dunrud [Dunrud@email.msn.com] <br />Sent: Tuesday, March 04, 2003 3:50 PM <br />To: Barbe, Henry <br />Subject: Angles Of Draw_West Elk Mine Area_3.4.2003.doc <br />Mr. Henry Barbe <br />Mountain Coal Company, LLC <br />West Elk Mine <br />PO Box 591 <br />Somerset, CO 81434 <br />Dear Henry, <br />March 4, 2003 <br />This letter is in response to our telephone conversation today regarding the range of angles of draw <br />measured in the West Ells mine azea. Exhibit 60, dated May 1996 and revised February, 1998, specifies <br />an angle-of--draw range of 10 to 20 degrees (from a vertical reference) with an average value of 15 <br />degrees. <br />In Table 1 of Exhibit 60, draw angles listed as15 and 17 degrees take into account the influence of <br />development entries and prior F-Seam room-and-pillaz mining. The average draw angle value of 15 ~~ <br />degrees is likely a conservative value, because the prior F-Seams mining was included in the , . ~. <br />calculations. In addition, the angle-of--draw for F-Seam mining, measured sepazately ranged from abouti~ ', •,..• <br />11 degrees to 14 degrees (rounded to the neazest degree). ..: - ~~.~~ <br />Therefore, anangle-of--draw value of 15 degrees should suffice for proposed longwall panels. <br />Sincerely, <br />C. Richard Dunrud, PE <br />3/5/2003 <br />