Laserfiche WebLink
• <br />• <br />• <br />2.04.6 <br />The D -2 coal seam overburden ranges in thickness from less than 100 feet <br />- to greater than 2,000 ft., and is characterized by alternating claystone, <br />siltstone, sandstone, and minor carbonaceous horizons. The lithologies <br />comprising the barren member of the Mesaverde formation are typically <br />laterally discontinuous and undergo abrupt facies changes within short <br />distances. The stratigraphic interval between recognizable horizons may <br />also change drastically, making correlation difficult. The base of the barren <br />member is approximately 700 ft. above the top of the Rollins sandstone and <br />the total thickness varies greatly as a result of topographic elevation and <br />erosional geomorphology. <br />The coal bearing member of the Mesaverde formation is stratigraphically <br />between the Rollins sandstone and the barren member, with the approximate <br />700 ft. thickness completely present, except near the outcrop area. The coal <br />seams which comprise the Bowie No. 2 Mine reserve occur in the Bowie and <br />Paonia Members of the Mesaverde Formation. A total of eight separate coal <br />seams have been correlated and measured. The B -2 Seam, D -2 Seam, in <br />ascending order, from the top of the Rollins sandstone have been found to <br />be potentially commercially viable for mining by underground methods. <br />The A -Seam directly overlies the Rollins sandstone with a thickness range <br />from 3 to 5 feet. The area where the seam does achieve a mineable <br />thickness does not comprise a reserve of adequate areal extent to be <br />considered a coal resource. <br />The B -1 Seam, lower B -Seam, meets the minimum physical criteria to be <br />considered a coal resource. The B -1 Seam thickness ranges from 5 to 16 <br />feet. The B -2 Seam, upper B -Seam, meets the minimum physical criteria to <br />be considered a coal resource. The B -2 Seam thickness ranges from 9 to 22 <br />feet. <br />Because of inadequate interburden between the B -2 Seam and the B -1 <br />Seam, only one of the seams at a particular location can be considered a <br />coal resource. The interburden between the seams ranges from a few feet <br />to about 70 feet. The seams are separated by as much as 50 feet of <br />interburden in only a small portion of the property. In order for a seam to be <br />PR -12 <br />PPRovcA <br />11/16/10 <br />2.04-18- 06/10 <br />