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/3G~°- -3 <br />• <br />SI v GEOLOGICAL EVALUATION <br />of <br />HYDROLOGIC REGIME <br />at <br />HAWKS NEST MINE, SOI+J;RSET COE.L DISTRICT <br />GUNNISON COUNTY. COLORADO <br />K. C. Bowman, Ph.D <br />Consulting Geologist <br />During the winter of 1978-79 four in-mine vertical core holes, the WSC 115, <br /> <br />06, 1`7 and 118, were drilled in the Hawks Nest East Mine to evaluate the coal <br />potential between the 'E' seam, which is now being mined, and the Rollins Sand <br />(,v 450 foot in-mine depth) which marks the base of the Mesaverde coals. In- <br />formation gained from these exploratory holes adds to our understanding of the <br />hydrologic regime in the area. <br />I closely supervised the drilling of these holes and was thereafter able <br />• <br />to advise the company on various geologic problems. We were also evaluating the <br />in-place methane potential in the coals being cored. Therefore, members of the <br />Colorado Geologic Survey staff were present throughout [he drilling of WSC ~5 <br />and 08, conducting an extensive desorption program oa the coals in these two <br />holes. The results of these tests together with additional geologic studies <br />completed by Dona Boreck, a staff member of the Colorado Survey, will soon be <br />available in open-file format from the survey. <br />