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. 2.04.6 <br />age from Upper Cretaceous Mancos and Mesaverde to <br />Holocene alluvial fill along the North Fork of the <br />Gunnison River. <br />Permit and adiacent Area: Geologic structure of the <br />Permit Area is relatively simple with an attitude of <br />N66°W and 3 to 5 degree dip to the northeast. The <br />structural dip direction changes near Terror Creek and <br />the lineation of Terror Creek may suggest the presence of <br />a fault. It will take additional drilling in the Terror <br />Creek area to determine the presence of a fault or other <br />structural anomaly. <br />There is one indicated fault that crosses the southwest <br />corner of the permit area. The fault system trends <br />approximately N55°W and dip 70 to BO degrees to the <br />northeast. These high angle normal faults have an <br />apparent strike slip component. The throw of the fault <br />ranges from 7 to 30 feet. The down side is the south <br />side of the fault. It is not certain whether the fault <br />• exists as a normal slip break or as a roll. <br />Although present drill hole spacing is adequate for <br />detection of large scale faults (approximately 50 ft. <br />displacement), uncertainty exists in predicting faulting <br />with less displacement, and the probability of <br />encountering "blind", unexpected faults within the mine <br />workings is moderate. <br />The geologic structure of the permit area may be modified <br />by the nearby location of igneous intrusive bodies. Coal <br />seams in this area have been coked and devolitized by <br />suspected sills, undoubtedly related to the Miocene Iron <br />Point Pluton (lunge, 1976). The combined effect of <br />extension type structural features, nearby igneous <br />activity, and frequency of inferred structures may <br />indicate the presence of an igneous complex at depth <br />beneath the area. Regional geophysical studies or deep <br />drilling would be required to confirm this idea. <br />The D-2 coal seam overburden ranges in thickness from <br />. less than 100 feet to greater than 1, 200 ft. , and is <br />P6PMIT APPLIGTIOB 2-04 ~ 14 <br />