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Homestake Mining Company May 10,2019 <br /> Regular(112d)Operation Reclamation Permit Application Package <br /> Legend <br /> Tension cracks and scarps <br /> Slope Failure Y ) <br /> ® East Wall(since 1979) <br /> East Wall 10,500 N(1980) <br /> - South Wall(1983) <br /> Northeast Corner(1983) - <br /> ® Northwest Corner(1983) ff <br /> ICRD Slips(1995) <br /> - TCRD Slips(1995) North Pit 111' <br /> ® South Wall(since 1996) <br /> - South Pit East Wall(since 2005) ' <br /> Indian Cr , <br /> kD <br /> Cr Tie Cam eek <br /> Rock Dump <br /> Note: Slope failure events are labeled in legend with year movement was first reported. North and South Pit events modified from <br /> AAI(1999);IRD and TCRD events from Golder(June, 1996a);and tension cracks and scarps from AAI(1999). <br /> Figure 3-15.Location of slope failure events, mapped tension cracks and scarps at the Pitch Mine. <br /> Multiple reports, memorandums, and other related material have been reviewed that document <br /> the history of slope movement, previous slope stability investigations, monitoring programs, <br /> modeling assessments, and mitigation efforts at the Mine. The most recent slope stability <br /> investigation, performed by Agapito Associates, Inc. (AAI) (1999), compiled and summarized ten <br /> previous detailed investigations of slope movement in the North Pit. These include: Dames and <br /> Moore (D&M) (1976); Pincock, Allen & Holt, Inc. (PAH) (1979); PAH (1980); Call & Nicholas, Inc. <br /> (CNI) (1982); CNI (1983); DP Engineering Inc. (DPI) (1993); CNI (1995); Golder (1995) as cited <br /> by Agapito (1999); and AAI (2000a). <br /> Other reports reviewed which evaluate slope stability of the pit slopes and the rock dumps or <br /> describe slope stability models include: RP (1979); Steffen Robertson and Kirsten (Colorado) Inc. <br /> EXHIBIT E-RULE 6.4.5(AMENDED RECLAMATION PLAN) Page 39 <br /> HOMESTAKE MINING COMPANY <br />