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<br />16,250 ~:d3 ~~er <br />slant deccnd i r:q <br />underground anti <br />ancountered. <br />_,_ • <br />month. This rate wi]i remain roiati~:ely <br />on the numl.~~r of. wor'.in~~ arr_a ~ nvailabl^_ <br />the amount of eyuip:~cnt brcui:c?owns that <br />con- <br />3r" <br />This minin^ facility is e::pected to remain a research and <br />d_velor_ment activity for the foreseeable future. P.evegetaticn <br />of the ra~..~ shale ~•:ill begin ~:;ithin one :ear of any area beccm- <br />in^_ inactive such as benches not being ,.~ed as part of the on- <br />going oaeraticr.s. The sloo_es of the dumrs =_nd other affected <br />areas '.till 'r.e ^reozrea for reveaetation actlvltles upon abaneon- <br />,~,~r.t ::rich is anticicated to be ir, the year 2040. The life of <br />the mine is e~:oected to be o3 years. <br />E. Geology - I.ature, depth and thic}:Hess of the ore body: <br />The geoleo}• of the Callahan TrustjD.~l. Shale crop°rty has bean <br />investigated `rpm the vie::point of using tha*_ oroaerty as file <br />in-situ test site for the Occidental Oil Shale process. <br />The Callahan Trust!D.A. Shale area is loczted in Garfield <br />Gountj, Colorado, bet'.deen DeBeUL'e and ;C'.nC ,211°" In the SOUthern <br />part of the '=iceance 3asin. The oil shah c?escribed in the Eollc•::- <br />171 seCtlOn Cn Stra `_1g I"a~, !? CU tC rOpS glen^• ~, °_ `' G "` ''F <br />north Slde GL the ';OlOradO Fiver. i•it. Callahan. is In the eastern <br />part of the area a:ith an elevation of ROOD _eet ar.d is almost <br />_~00 feet above the ri•:er. Riley Gulch anti Legan `.:ash, the t.:o <br />major drainages of the area, range in depth below the ridges <br />from several hundred feet to almcst '.000 . _cc. ?ic::ever file <br />ridge tons are as much as a quarter mile ::ide, and travel by <br />four-~.aheel drive vehicle across the area is not difficult once <br />the top of the ridges has been reached. <br />Stratigrnphic units outcropping in the Lecan [lash area include <br />file Piasatch formation of Eocene age, the Green River formation, <br />also of Eocene age, and basalt of late Tertiary age. <br />The ;9a sa tell formation does not ou tcrc.p on the groper ty. ilow- <br />e-:er, it must be crossed by every access road reaching the <br />area `nom any direction except north. The [:asatch formation is <br />o: centin_ntal orig.ii: and Comprises siltstonas with a high per- <br />~entaue o.` clay and sandstones. Zt uneerlles the cll.shale <br />formation throughout file basin. The main oil shale section is <br />contained in the Green River Formation s:hich is comprised of <br />three units, the Douglas Creel: member, the Garden Gulch member, <br />ant; the Parachute Cree}: member containing the oil shale, and <br />overlain b}~ the sands of the C'nita Lormation. <br />The Douglas Cree4 member is formed of cress-wedded ripple-marked <br />sandstone .:ith some limestone and shale. It forms a prominent <br />cutcroa in Logan Mash. <br />The Carden Gulch mer..ber overlies the Douglas Creek. member and <br />ur.d2rlies the Parachute Creel: member. The predominant noel: type <br /> <br />