2012-10-01_REVISION - M1977297 - Laserfiche WebLink

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Gold Eagle Mining Inc. Burros Mine Permit Number M- 1977 -297 7.0 Facilities Evaluation At the present time there are no facilities at the Burros Mine Adit that can be evaluated. The previous permit holder reclaimed most of the Burros Mine site prior to passing the permit on to the present holder of the permit. Given the probation on activity by DOE; no planning for future facilities at this site has been completed. The uncertain nature of the pending DOE PEIS limits the understanding of measures that will be necessary to limit impacts from ore and waste rock piles, air quality, and surface water facilities. Information from the DOE PEIS will guide the development of facilities and the Burros Mine Site. 8.0 Groundwater Information The Burros Mine site is located on the north side of Burro Canyon which bisects the northwest flank of the Dolores Anticline. Mesozoic age continental sandstone, shale and mudstone are exposed by the incision of the canyon. Geologic units dip at a shallow 2 to 5 degrees towards the northeast. Exposed formations of Mesozoic age within one mile of the Burro Mine (from bottom up) include the Jurrassic Period - Navajo Sandstone ( -200 ft. thick), Entrada Sandstone («70 to 90 ft. thick), Wanakah Formation also know as the Summervile Formation ( -100 ft. thick), and the Morrison Formation Salt Wash Member ( -300 ft. thick) and the Morrison Formation Brushy Basin Member ( -500 ft. thick); overlying the Jurrassic Period units is Cretaceous Period —Burro Canyon Formation ( -200 ft. thick). A generalized stratigraphic section is included as Figure 2 and a geological map of the area as Figure 3. The Burros Mine site is in a geologically stable area, with the nearest fault zone of significance lying over 2 1 /2 miles to the southwest along the northwestern nose of the Dolores Anticline. The regularity of the northeasterly dendritic drainage on the northeast side of the Dolores Anticline (northeast of the Burros Mine portal) is substantial evidence of the stability of the Burros Mine site. Negative effects on ground water resources from mining operations at the Burros Mine are expected to be limited by the characteristics of the local and regional hydrogeologic system. The primary source of ground water that could be affected during mining is the Entrada Sandstone. The Entrada is separated from the mining horizon by approximately 100 feet of mudstones and siltstone in the Wanakah Formation and more than 100 feet of mudstones, siltstone and low permeability sandstone of the lower portion of the Salt Wash Member of the Morrison formation. Mineralized Salt Wash sandstone itself is relatively impermeable, displaying no open pores during petrographic examination. Exhibit U -3