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R'INCORPORATED GEORGE M.L.ROBINSONP.G. <br /> FM IRMNIF.NT\I,A\D E.\GI\FERI\G SERVICFI� <br /> STRAI FDICAI I.1 POSITIO\FD-?FCf I\IC.AI.I.Y PRFPARFD <br /> J.ER[CH Rf1UBER,P.E. <br /> MAY DAY IDAHO MINE COMPLEX <br /> WILDCAT MINING CORPORATION <br /> ORIGINAL 112(d)PERMIT <br /> Geotechnical Stability Exhibit <br /> Exhibit 6.5 <br /> Geotechnical laboratory and stability analyses have been conducted by <br /> • R Squared, Inc. (Denver, Colorado)-Mr. John Erich Rauber, Colorado Registered <br /> Professional Engineer 426647 (Access road, May Day portal collapse, and May Day No. <br /> 1 portal bench out slope geotechnical analyses); <br /> • Wilson-Bridge; David L. Wilson—Colorado Professional Engineer#29350 <br /> • Rauber-Access Road, MSE Wall Stability; Colorado Registered Professional Engineer <br /> #26647) and <br /> • Terracon, Inc. Farmington,New Mexico (Laboratory Services) <br /> Geotechnical hazards evaluated include the following: <br /> • May Day No. 1 Portal Collapse and head scarp (Denver, Colorado)-Mr. John Erich <br /> Rauber, Colorado Registered Professional Engineer#26647); <br /> • New Access Road-road stability including cut slope (Denver, Colorado)-Mr. John Erich <br /> Rauber, Colorado Registered Professional Engineer#26647); <br /> • The La Plata River bridge; and <br /> • Avalanche Assessment <br /> Table 6.5-1 is a summary of geologic hazard characteristics associated with the May Day Idaho <br /> Mine Complex: <br /> Table 6.5- 1 <br /> Summary of Geologic Hazard Characteristics <br /> Age Formation Geologic Description <br /> Latest Holocene Recent landslide deposits(Qlsr) Unsorted,unstratified rock debris.Clay,silt,sand and <br /> sometimes rounded river gravel. These deposits are prone to <br /> renewed or continued land sliding and may be susceptible to <br /> settlement when loaded. They also indicated the settling in <br /> which future slope failures will likely occur.Soil slips are <br /> thin really small,recent landslides that formed on steep <br /> slopes mantled by colluviums or residuum. Shallow <br /> groundwater may be present within areas mapped as recent <br /> landslide deposits. <br /> Late Pleistocene Younger moraine deposits(Qml) Heterogeneous deposits of chiefly silty to boulder sediments <br /> deposited by or adjacent to glacial ice near the mouth of La <br /> Plata Canyon.Poorly exposed,but appears to be dominantly <br /> matrix-supported,pebbly and cobbly silt with occasional <br /> Wildcat Mining Corporation <br /> 112(d)Permit—May Day Idaho Mine Complex <br /> 3926 North State Hwy 67,Sedalia,CO 80135 <br /> Phone:(303)832-7664 Fax:(303)832-7469 <br /> Revised:Augus4 22,2014 <br />