Laserfiche WebLink
. z.oa.s <br />Although present drill hole spacing is adequate for detection of large scale faults <br />(approximately 50 ft, displacement), uncertainty exists in predicting faulting with <br />less displacement, and the probability of encountering "blind", unexpected faults <br />within the mine workings is moderate. <br />The geologic structure of the permit area may be modified bythe nearby location <br />of igneous intrusive bodies. Coal seams in this area have been coked and <br />devolitized by suspected sills, undoubtedly related to the Miocene Iron Point <br />Pluton (Junge,1976). The combined effect of extension type structural features, <br />nearby igneous activity, and frequency of inferred structures may indicate the <br />presence of an igneous complex at depth beneath the area. Regional <br />geophysical studies or deep drilling would be required to confirm this idea. <br />The D-2 coal seam overburden ranges in thickness from less than 100 feet to <br />greater than 2,000 ft., and is characterized by alternating claystone, siltstone; <br />sandstone, and minor carbonaceous horizons. The lithologies comprising the <br />barren member of the Mesaverde formation are typically laterally discontinuous <br />. and undergo abrupt facies changes within short distances. The stratigraphic <br />interval between recognizable horizons may also change drastically, making <br />correlation difficult. The base of the barren member is approximately 700 ft. <br />above the top of the Rollins sandstone and the total thickness varies greatly as <br />a result of topographic elevation and erosional geomorphology. <br />(3)(a)(i) 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 be <br />potentially commercially viable for mining by underground methods. <br />The A-Seam directly overlies the Rollins sandstone with a thickness range from <br />3 to 5 feet. The area where the seam does achieve a mineable thickness does <br />not comprise a reserve of adequate areal extent to be considered a coal <br />resource. <br />L J <br />PR-08 <br />2.04 - 14 - 7/03 <br />APPea~ <br />9~z s! 03 <br />