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May Day Idaho Mine Complex 112 (d) Permit Application <br />References <br />Eckel, E.B. (1949) Geology and Ore Deposits of the La Plata District Colorado. U.S. <br />Geological Survey Professional Paper 219. <br />Kirkham, R.M.; Gonzales, D.M.; Poitras, C.; Remley, K. and Alen, D. (2000) Geologic <br />Map of the Hesperus Quadrangle, La Plata and Montezuma Counties, Colorado. <br />Colorado Geological Survey Open File Report 00-4. <br />Topper, R, Spray, K.L., Bellis, W.H., Hamilton, J.L. and Barkmann, P.E. (2003) <br />Groundwater Water Atlas of Colorado. Colorado Geological Survey Special Publication <br />53. <br />(c) Geologic Media Beneath Facilities <br />The surface geology beneath the facilities is shown in Attachment T-3. As described <br />above, based on available information, it is currently inferred that the Entrada Sandstone <br />is the water bearing zone. A description of the geologic media from the surface to the <br />Entrada Sandstone is described below (Kirkham et.al, 2000): <br />• <br />Age Formation Geologic Description <br />Upper Jurassic Morrison Formation Bentonitic mudstone and claystone containing, <br /> thin beds of verb tine-grained sandstone and <br /> minor conglomeratic .'.mdstonk:. <br /> Junction Creek Sandstone Highly cross-bedded to mnssi\e. fine to <br /> coarse- Trained sandstone. <br /> Wanakah Formation Very fine to fine-grained sandstone and <br /> mudstone <br /> Entrada Sandstone Fine to coarse grained highl% cross bedded <br /> sandstone. <br />Additionally, the Dolores and Cutler Formations are exposed in the northwest section of <br />the permit area: <br />Age Formation Geologic Description <br />Jurassic and <br />Upper Triassic Dolores and Cutler <br />Formation, undivided Shale, siltstone and sandstone. <br />Reference: <br />Kirkham, R.M.; Gonzales, D.M.; Poitras, C.; Remley, K. and Alen, D. (2000) <br />Geologic Map of the Hesperus Quadrangle, La Plata and Montezuma Counties, <br />Colorado. Colorado Geological Survey Open File Report 00-4. <br />• <br />May Day Idaho Mine Complex 112(d) Permit Application <br />September 21, 2010 <br />9