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Whirlwind Mine Groundwater Characterization Report <br /> Figure 4 indicates the hydrostratigraphy within the geologic section for the Whirlwind Mine area. <br /> Alluvium and the Dakota Sandstone may form aquifers in the region, but data associated with <br /> the Whirlwind Mine show that these units are not consistently present or form aquifers. The <br /> origin and fate of groundwater in these strata is discussed in Section 7.0 (Hydrogeologic <br /> Conceptual Model) of this report. <br /> The following sub-sections discuss the historical hydrology data collected over the last several <br /> decades that support the occurrence of groundwater in these hydrostratigraphic units. <br /> 4.2.1 Historical Hydrology Information <br /> 4.2.1.1 Historical Mine Water <br /> There are numerous mines in the study area that have explored for and mined uranium and <br /> vanadium ore from the Top Rim of the Salt Wash. These mines have been collectively referred <br /> to as the Lumsden Canyon Mines and include the Bonanza Mine and Dutchman Mine located <br /> on the north side of the canyon, and the Pack Rat No. 1. (Hubbard), Lumsden No. 1, Lumsden <br /> No. 2, Lumsden No. 3, La Salle (Rajah 49 and Lumsden No. 5), La Salle No. 2 (also Rajah 49 <br /> and Lumsden No. 5), La Salle No. 2 (Gilmore), La Salle No. 1, and Austin Portal. The Cherokee <br /> Headframe was associated with the J.W.L Fraction No. 1 and La Salle No. 5 Shaft. See Figure <br /> G-2 in the DRMS mine permit for locations of these mines (EFR, 2008a). Selected mine <br /> features and monitoring locations are shown on Figures 5 and 6. <br /> As described in the DRMS mine permit and the BLM Plan of Operations(POO) (EFR, 2008b), a <br /> few mines were noted to have discharged mine water in the past, some as recently as 1995, but <br /> are no longer discharging. These mines include: 1) Packrat Mine(2.0 gpm); 2) Lumsden No. 2 <br /> (1.8 gpm); 3) La Salle (Rajah 49 and Lumsden No. 5) (1.1 gpm), and 4) Rajah 30 Shaft and <br /> John Brown Tunnel Portal (10-15 gpm) (EFR, 2008a). , Since most of these mines were driven <br /> into the Top Rim sandstone and the local dip of stratigraphy is to the northeast, any significant <br /> volume of water encountered in the mine workings would be expected to flow toward the main <br /> portals of these mines (EFR, 2008a). Figure 6 shows the mapped mine pools (standing water) <br /> as determined by Umetco in 1994. <br /> Western Water& Land, Inc. 14 <br />