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2) Ore Storage: The uranium - bearing rock that will be mined is the upper sandstone horizon of the Salt <br />Wash Member of the Morrison Formation. No SPLP tests were conducted on ore samples from the <br />mine. However, it is expected that the results of such testing would indicate a leachate containing <br />elevated levels of radium, uranium, arsenic, and selenium as does SPLP testing of ore samples from <br />similar Salt Wash uranium mines. The results of the leach testing of ore from other Salt Wash deposits <br />are shown in the table attached as Appendix U -1. To ensure that the temporary stockpiles of uranium <br />ore will not impact ground or surface water, the ore pad will be limited to 0.1 acre and a berm will be <br />maintained around the pad creating a zero discharge area. The ore pad will be underlain by a <br />geosynthetic clay liner (GCL) on a prepared subgrade. The liner will be protected by 2.5 feet of <br />compacted cushion material and 1 foot of run of mine (ROM) waste rock. Details regarding the <br />construction of the ore pad are presented in Appendix U -2, which uses the generic design developed by <br />Golder Associates for Energy Fuels Resources Corporation's Whirlwind Mine (M- 2007 -044). The liner is <br />designed to prevent downward migration of leachate that could potentially impact ground water. At the <br />end of mining, the liner and cover material will be excavated and placed in the mine. <br />3) Groundwater: The mine is located on a steep south - facing slope which experienced extensive <br />exploration drilling and small scale mining decades ago. This is the northeast limb of the Gypsum Valley <br />salt- cored, breached anticline. The Sego Mine is dry in the upper part of the Salt Wash. Figure 3 is a <br />portion of the USGS Geologic Map (Hamm Canyon Quadrangle) showing the area around the mine and <br />Figure 4 is the geologic cross section from the same USGS map. The small adits (Lookout Mine) in the <br />lower part of the Salt Wash outcrops (200 feet vertically and stratigraphically lower), about'''/ mile to the <br />south do not make water, either. The lower part of the Navajo Sandstone possibly contains perched <br />groundwater in the vicinity of the Sego Mine; however, that is more than 700 feet deep at the mine site. <br />This interval includes the Summerville Formation consisting of about 100 feet of predominately even <br />bedded silty shale and claystone. Since the Sego Mine is dry, the mine workings cause no impact to the <br />Navajo or any other deeper aquifer. The sedimentary rocks to the south and southwest of the mine dip <br />about 7 degrees to the northeast. About % mile north of the mine (above the mine) is the rim of <br />Monogram Mesa. This is capped by the Burro Canyon Formation conglomerates, sandstones, and <br />shales. The units here dip about 3 degrees to the northeast, toward the Dry Creek Basin syncline. The <br />Burro Canyon is known to host perched groundwater near its base in the Monogram Mesa /Dry Creek <br />Basin area. This is separated from the mine horizon by about 350 feet of Brushy Basin Member of the <br />Morrison Formation which is predominately bentonitic mudstones that effectively preclude the Burro <br />Canyon water from reaching the Salt Wash sandstones. Because of this hydrogeologic setting, <br />groundwater baseline characterization and monitor wells are deemed unnecessary and none is <br />proposed as part of the EPP. <br />2. Maps <br />In AppendixU -3, the following maps are enclosed: <br />• Figure 1- General Location Map <br />• Figure 2- <br />Mine Surface Area <br />2 <br />