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The sandstone beds encountered in the interburden are massive. tine gained, well sorted with <br />rounded to spherical sand grains and cross bedded with interbedded shale lenses. The depositional <br />environment is tluvial. The thickness of the sandstone beds ranee from two feet to over 30 fee[. <br />The total thickness of the interburden is approximately 570 feet. <br />Shale beds occurring in the interburden consist of Brey to dark erey hard shales and carboniferous <br />soft shales with interbedded coal laminae. Shales comprise approximately 75 percent of the <br />interburden with the coal and sandstone comprising the remaining 25 percent. <br />Numerous small coal seams are located within the interburden ranging in thickness from several <br />inches to nearly six feet. Mineable seams, the N. 0, J and L seams are present in portions of the <br />permit area. The O, N, and L seams will be mined by the contour operations. <br />Primero Coal <br />The primero coal is located within the Lower Raton Formation. The seam ranges in thickness <br />from 0 to 9.3 feet. A shale parting runs in the upper portion of the seam and increases near the <br />mouth of Lorencito Canvon. <br />Underburden <br />• The underburden is located in the Lower Raton Formation and is comprised of interbedded <br />sandstones and shales with coal lenses. The total thickness of the underburden is ranges up to <br />1.000 feet. <br />The sandstone beds encountered in the underburden are, fine Brained, hard and soft, and well <br />sorted. The thickness of the sandstone beds range from four feet [o over 30 feet. <br />Shale beds occurring in the underburden consist of grey to dark grey hard shales and carboniferous <br />soft shales with interbedded coal laminae. Shales comprise approximately 85 percent of the <br />underburden with the sandstone and coal comprising approximately 15 percent. <br />Physical/Geochemcial Properties <br />Physical and geochemical data for the overburden, interburden, coals, and underburden are <br />included within Exhibit 6. Geology Technical Report. <br />• <br />FERnI1T rt. Iene!0. w9, '~0~-s (revised 6/30/97) <br />