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Collom Area Geology Pre - Feasibility Report <br />Additionally, cross - sections from the geological model spanning the southern <br />end of Wilson Creek show the Collom side of Wilson Creek as being about 50' <br />to 100' feet lower than the Colowyo side of Wilson Creek, see Cross Section <br />EW04 in Appendix I. However, no surface mappable features indicate a fault <br />in Wilson Creek. <br />3.7 Miscellaneous Geological Issues <br />3.7.1 Abandoned Geophysical Probe <br />On October 31, 1981, Savage Geophysical lost a geophysical logging probe <br />with a radioactive source in drill hole DF -59. The probe was not recovered <br />and the drill hole was plugged and abandoned. <br />The drill hole files indicate that W.R. Grace & Company (Grace) was in close <br />contact with the BLM during this incident. However, the files do not indicate <br />whether Grace notified the Nuclear Regulatory Commission of the lost probe. <br />Thus, the long -term impacts to Colowyo are unknown. <br />According to drill hole files, the probe was lost in the Trout Creek Sandstone <br />at a depth of approximately 950 feet. Therefore, the probe is located far <br />beneath any planned mining in the CMA. <br />3.7.2 X -Seam Coal Resources and Potential Spoil Site <br />The X -Seam is known to crop out along the valley sides at north end Little <br />Collom Gulch, where an out -of -pit spoil dump is planned for mining. The average <br />thickness of the X3 and X4 seams is approximately 4.7 feet and 5.9 feet, <br />respectively, in seven holes drilled in 2005. Based on this new drilling, the X <br />seam might need to be mined prior to placing mine spoils in the area. Colowyo is <br />currently reviewing developing mine plans for extracting the X seam in the area. <br />August 2005 Page 11 of 38 <br />