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. 2.04.7(1) Groundwater Information relating to the Tow Creek Sandstone The base of the Iles formation is generally defined as the bottom of the Tow Creek sandstone. The Tow Creek ' sandstone is a light brown, fine grained, well sorted sandstone that is cemented with calcite. This rock ranges from 35 to 125 ft thick, and is a cliff-forming bed in areas outlying our permit area. The deepest member encountered by Sunland's drilling is a sandstone which overlays the Tow Creek by a considerable distance. This sandstone (and the Iles formation of which it is a part) is underlain by the Tow Creek Sandstone and the Mancos Shale, Neither this unnamed sandstone nor (obviously) the underlying Tow Creek sandstone outcrops anywhere on Sunland's permit area. The entire Sunland permit area is located in a graben of approximately 10,000 ft in width which is transcected by the Trout Creek canyon very nearly on the strike of the down-thrown block. This graben is defined by two large (+200') displacement faults. The up- stream (southwest) fault produces a conspicuous escarpment and cross-canyon where it interscects the Trout Creek canyon _ approximately 7,000 ft up-stream of the Apex No. 2 mine. The down-stream (northeast) fault is evidenced by Rattlesnake • Butte, and is clearly visible in the Trout Creek sandstone outcrop along the north canyon wall of Middle Creek. The Apex No. 2 mine is approximately 3000 ft up-stream from this fault. The Tow Creek sandstone does not outcrop anywhere downstream of the southwest edge of this graben. In other words, the nearest possible outcrop of the Tow Creek sandstone is over 7,000 ft UP-stream from our mining operation. The following information represents data generated by cottelating the separation distance (of 260') of the lower pinnacle seam to the deepest sandstone intercepted by Sunland's drilling. Please refer to map Exhibit "C" for drill hole locations. Rev 05/05/81 ~+.