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~ _ !, ~~. _ ~ <br />• sss <br />PURPOSE AND SCOPE COIO. ~ + '"~' <br />~I Ji .ll hJSq.•l~,P•- <br />The purpose of this report is to present the evaluation of the <br />technical aspects of the O.C. Mine ll2 (Ohio Creek Mine l+2) located in <br />Section 16, Township 1 5 South, Range 86 West of the 6th P.A1., Gunnison <br />County, Colorado. The 0. C. Mine is an underground mine removing coal <br />from the No. 2 bed or C bed of the Mesa Verde formation. In the area <br />of this report, the regional dip is approximately 3° Northwest; however, <br />there are local small fluctuations. Some faulting has occurred which <br />controls the limits of mining activity. These faults are also signifi- <br />cant to the operation of the mine. <br />It is the purpose of this report to present evaluations of [he sur- <br />face and ground water hydrology of the area, sedimentation and erosion <br />factors, subsidence monitoring and control, disposal of "gob" rock, and <br />{ <br />to present some of the details of [he ultimate reclamation plan for the <br />site. <br />}IiSTORY AND SITE CONDITIONS ' <br />According to the mine map by E. Schaff b Associates, this mine has <br />been operated apparently continuously since the early 1940's. It is a <br />relatively low production mine employing conventional mining methods. <br />The site consists of two levels; one the entry level, and below that <br />the load-out level. These two levels are separated by a bench approxi- <br />mately 20 feet high. Tlie site is on the southwest flank of a promontory <br />in tl+e Gunnison National Forest, on a small unnamed tributary northeast <br />