Laserfiche WebLink
to nonexistent . Large faults and dikes correlate reasonably <br /> • well between the two coal beds . <br /> Mining conditions in the Middle bed are <br /> somewhat better than those encountered in the B bed , possibly <br /> because the overburden depth is less than over the B bed , <br /> and because volatile matter of the coal is higher than in <br /> the B bed . <br /> Characteristics of the :fiddle bed include : <br /> Cover : The bed lies under approximately <br /> 2 , 500' of overburden. <br /> Dip : The dip of the bed varies from 100 - 150 . <br /> Thickness : Ranges from V -20' thickness . <br /> Recoverable The maximum height recoverable is 8 ' <br /> Coal : because of the substantial depth of over- <br /> burden, and because the working height of the <br /> • mining equipment is 8 ' . <br /> Roof Adverse roof conditions have been encountered , <br /> Conditions : making a portion of the seam commercially <br /> unminable . <br /> Bounce : The main slope entries were , on one occasion, <br /> damaged by a heavy bounce(stress adjustment) . <br /> Coal seams , or beds , not mined are the A, <br /> Placita and Sunshine. <br /> The A bed is the lowest coal seam in the Coal <br /> Basin anticline. It lies at the bottom of the Coal Basin <br /> Coal Interval , either directly atop the Rollins , or separated <br /> by up to 13 ' of shales and siltstones . The A bed itself <br /> divides at times into upper and lower beds , separated by a <br /> parting of up to 30 ' . <br /> 18 <br />