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32.04 APPLICATION FOR PERMIT FOR SURFACE OR IINDERGRODND MINING ACTIVITIES -- <br />MINIMUM REQUIREMENTS FOR INFORMATION ON ENVIRONMENTAL RESOURCES. <br />2.04.6 Geology Description. <br />(2) (a) (ConC'd.) <br /> <br />Permit and Adjacent Area: Geologic structure of the <br />Permit Area is relatively simple with an attitude of <br />N88°W to N76°W and 4 to 7 degree dip to the northeast, <br />into the Piceance Creek Basin. The regional dip is <br />further modified by localized flexures exposed under- <br />ground commonly referred to as "rolls". These struc- <br />tures are technically monoclines which dip to the north <br />and are believed to be formed penecontemporaneous or <br />early in the diagenitic process. They are generally <br />laterally discontinuous and irregularly trending. <br />Fault zones have been encountered within the workings <br />which range in displacement from a maximum of 50 ft. to <br />less than 1 ft. (shear zones). They are typically high <br />angle normal faults which contain minor amounts of <br />gouge (1 to 4 ft.) and produce minimal mine inflows. <br />Drag folding commonly accompanies the fault planes. <br />Based upon underground observations, two separate epi- <br />• Bodes of faulting occurred within the Permit Area. <br />The earliest fault system trends approximately N65°E <br />and dips 70 to 80 degrees to the down-thrown side. Two <br />faults have been exposed wfiich are sub parallel and re- <br />sult in a graben structure. Displacements are 2 to 6 <br />f[. and locally bifurcate into shear zones. <br />The younger fault system trends approximately N35°W and <br />dip 70 to 80 degrees to the northeast, These high an- <br />gle normal faults have an apparent strike slip compo- <br />nent and offset the earlier faults in a left lateral <br />direction, <br />Although present drill hole spacing is adequate for de- <br />tection of large scale faults (approximately 50 ft. <br />displacement), uncertainty exists in predicting fault- <br />ing with less displacement, and the probability of en- <br />countering "blind", unexpected faults within the mine <br />workings is moderate. High and low altitude aerial <br />photographs portray a multitude of photo-lineaments and <br />correlation between physical structures and Lineaments <br />is difficult. However a geomorphological investigation <br />~~ Revised 08/01/84 <br />Revised 10/01/87 <br />18 <br />