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Coal related strata depths are estimated in <br /> the area of the underyro�ound aor�cings... The _pth.s are expected <br /> to remain constant 1n the areas of future oDeratior_s as the <br /> dio of the coal seams are roughly paralleled by the over- <br /> lieing surface west of Huntsman. Ridge . (Se_ Table III-D-1) <br /> 2 . Description of geology of the permit area . <br /> a . Strata classification , structure , and depth <br /> The permit area is substantially the same as <br /> the mine plan area . The mine plan area totals approximately <br /> 23 square miles while the permit area totals approximately <br /> 20 square miles . The difference lies in the inclusion of- <br /> three square miles on the west side of Huntsman Ridge which <br /> overlie the underground workings projected for the neat <br /> forty Years . The areas of surface disturbance , all of which <br /> are contained within the Coal Creek drainage of Coa= Basin, <br /> are identical . <br /> Coal basin is a northwest-_rending eliptical <br /> anticline , formed by the fgilding of sedimentary rock over an <br /> igneous intrusion, probably a Tertiary lacc:_Iith . Strata of <br /> the basin date from the Cretaceous Period of the Mesozoic <br /> Era . The principal formations are Msancos SInale and the <br /> Mesaverde, although several ccnes of igneous dikes have been <br /> encou7atered , both on the surface and in underground developmenc . <br /> See Exhibits III-D-3 (a-c) Geology Cross Sections . <br /> The coal bearing Mesaverde formation outcrops <br /> on --he n o r t h, west a n d south sides of t h e e r o s i o n a l basin . <br /> The mine Portals are located on the west _.0 sides <br />