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<br />month. The rate will remain relatively constant depending on the number of <br />working areas available underground and the amount of equipment breakdowns <br />that are encountered. <br />Mork on the processing area should start in July and take approximately two <br />months to complete. The location of the processing area will be situated <br />so that as little leveling and grading as possible will be done. <br />The 24,000 ft.2 area necessary for the raise boring will be constructed <br />when the initial access drifts are completed to the proposed retorts. The <br />access mining is scheduled to be completed by November and the preparation <br />and raise boring will continue through the next year. <br />F. Geology - Nature, depth and thickness of the ore body: <br />The geology of the Callahan Trust/D.A. Shale property has been investigated <br />from the viewpoint of using that property as the in-situ test site for the <br />Occidental oil shale process. <br />The Callahan Trust/D.A. Shale area is located in Garfield County, Colorado, <br />between DeBeque and Grand Valley in the southern part of the Piceance Basin. <br />The oil shale described in the following section on stratigraphy outcrops <br />along the Roan Cliffs on the north side of the Colorado River. Mt. Callahan <br />is in the eastern part of the area with an elevation of 8606 feet and is almost <br />3600 feet above the river. Riley Gulch and Logan Flash, the two major drainages <br />of the area, range in depth below the ridges from several hundred feet to al- <br />most 3000 feet. However the ridge tops are as much as a quarter mile wide, <br />and travel by four-wheel drive vehicle across the area is not difficult once <br />the top of the ridges has been reached. <br />Stratigraphic units outcropping in the Logan Wash area include the 4Jasatch <br />formation of Eocene age, the Green River formation, also of Eocene age, and <br />Ex. D - 2 <br />