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_ Fixed carbon 6.8 . 3 percent <br /> • Volatile matter 22 . 8 <br /> Ash 8 . 4 <br /> Sulphur 0. 5 <br /> Btu + 14 , 500 <br /> Moisture free <br /> Mining conditions are adverse and , in fact , <br /> no other commercially viable miring operations are known to <br /> exist with conditions comparable to those encountered in <br /> mining the B bed . Mining of the B bed is economically <br /> feasible only because the metallurgical qualities of the <br /> coal are excellent . <br /> Characteristics of the B bed and problems <br /> encountered in mining the seam include : <br /> Cover : Most of the remaining reserves are between <br /> 2 , 000 ' -3 , 000' deep . <br /> Dip : Th8 dip of the coal beds varies from 100- <br /> 15 . <br /> Faults : Numerous faults limit and impede mining . <br /> Displacements reach as much as 300 ' . <br /> Faulting is associated with the No . 4 mine <br /> entry in particular . <br /> Igneous Igneous dikes affect the mine 'Layout , and <br /> Dikes : decrease coal recovery . <br /> Roof : Roof conditions vary throughout the property . <br /> Faults , rider seams , bedding-plane movement , <br /> and paleo channels adversely affect roof <br /> conditions . Rib sloughage also adversely <br /> affects the roof by increasing the unsupported <br /> span. The roof is more sensitive and sus- <br /> ceptible to deterioration and breakage at <br /> depths in excess of 1 , 500 feet . <br /> Changing Abrupt rolls , concealed faults , rock and <br /> Conditions : bone partings , methane and coal outbursts <br /> are unpredictable and increase the risks <br /> • associated with. ;Wining . <br /> 16 <br />