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• <br />r~ <br />L <br />• <br />An inspection of the King Coal Mine workings show no significant faults <br />displacements. The coal is strong and pillars are structurally competent showing <br />(crushing) or rib spalling. The mine floor does not buckle due to stress from the <br />because the water [able is lower than the seams, pore water pressure is non-existe <br />mine roof consists of thinly laminated shales and sandstones. These beds rise up <br />Cliff House sandstone an average of twenty Feet above the coal seam. The thick i <br />provides a great deal of ground stability and generally prevents subsidence from t <br />after pillars are extracted during second mining. Reports concerning [he effects a <br />subsidence for the upper seam are included in Section 2.05.6 <br />STRATIGRAPHIC CROSS-SECTION <br />A cross-section of the King Coal Mine shows several coal seams or rider se <br />depths from the surface (See Appendix 4). The overburden above the King Coal h <br />Menefee) seam consists exclusively of sandstone and shale. The cross-section was <br />exploratory core drill hole on the mine plan area (Federal Lease). The information <br />1977. The drill hole is located in the SE/4 NW/4 of Section 32, and is shown on N <br />Additional drilling log data and Colorado Geological Survey data are included in P <br />locations of referenced samples are shown on Regional Geology Map C-11. <br />The second cross-section shows the basic geology of La Plata County of w} <br />area is a part. The section is helpful in visualizing the geology mentioned above (~ <br />Data obtained from an exploratory core drill hole within the federal lease m <br />added by Permit Revision PR-OS is included as Appendix 4(2). <br />2.04.6 page 5 <br />r strata <br />lack of squeezing <br />~erburden and <br />. The immediate <br />~[he base of the <br />iff House sandstone <br />tching the surface <br />i control of <br />tms at various <br />ine (upper <br />obtained from an <br />was obtained in <br />ap C-3 and C-8. <br />ppendix 4, and <br />t the Hay Gulch <br />Appendix 4). <br />ification area <br />February 1997 <br />