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May Day Idaho Mine Complex 112 (d) Permit Application <br /> Junction Creek Sandstone Highly cross-bedded to massive, fine to <br /> coarse- ained sandstone. <br /> Wanakah Formation Very fine to fine-grained sandstone and <br /> mudstone <br /> Entrada Sandstone Fine to coarse grained highly 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 />(d) Fracture System with Respect to Facilities <br />Several east-west faults are present within the permit area as shown in Attachment T-3. <br />None of the facilities including the proposed tailings disposal areas are located on <br />these faults. <br />The extent of fractures underground has not been determined A fracture analysis <br />will be undertaken within the underground workings prior to tailings disposal <br />A detailed discussion follows (See Attachment H) <br />(e) Potential Impacts to Surface and Groundwater <br />Surface water and groundwater can be impacted without abatement via the following <br />pathways: <br />Designated chemicals can enter directly into surface water via spills; <br />Designated chemicals can enter into groundwater via infiltration from surface <br />spills; <br />Designated chemicals can enter into groundwater via leaching from tailings. <br />However the commitment to dry stack underground tailings mitigates all potential <br />surface and groundwater quality mining impacts. Dry stack underground <br />tailings disposal methods will be used to mitigate or avoid groundwater <br />concerns with the mine operation. Appropriate groundwater and surface <br />water monitoring and point of compliance programs will be established to <br />demonstrate compliance with applicable water quality standards <br />6.4.20(9) Groundwater Quality Data <br />(a) Existing and Reasonably Potential Future Groundwater Uses Two Miles Down- <br />gradient of Affected Lands <br />REVISED June 5, 2011 <br />May Day Idaho Mine Complex 112(d) Permit Application <br />September 21, 2010 <br />10