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} <br />i. ~ • • <br />USGS Review Comments <br />Narrative Section - Mini <br />1. Discuss the development of the main entries, giving the number of <br />entries, entry widths, centerline distances and size of barrier pillars. <br />2. Discuss the development of panel entries off the mains, giving <br />sequence of development and mining of the panels. <br />3. Discuss a plan for mining within the panels and method of pulling <br />pillars. <br />9. Discuss the type of roof bolts used, including spacing and any <br />additional support needed. <br />5, Discuss the ventilation specification of all fans and location of <br />the fans. Include any anticipated changes made in the ventilation system. <br />6. According to the mine plan, a total of 19.5 x I06 tons will be <br />mined during the life of the mine. Is this total recovez'able tonnage? <br />If so, what are total in-place reserves and what is the overall percent <br />recovery factor? <br />Maps <br />1. Provide coal isopach maps for all minable beds. <br />2. Provide overburden and interburden maps relating to all minable <br />seams. <br />3. Please put lease boundaries and lease number on Mine Map. <br />4. Please provide Coal Reserve Base Maps for all coal beds found in <br />permit area, including tabulations of average thickness and total tonnage. <br />This should include all beds whether minable seams or not. A Coal Reserve <br />Base Map should be made for each coal bed being considered. <br />5. On Mine Plan Map, designate which areas are to be room and pillar <br />mining and longwall mining. <br />