Laserfiche WebLink
GEOTECHNICAL STABILITY EXHIBIT <br /> There are no buildings or other man-made structures that could be affected by any geotechnical stability <br /> issues at the Gloria Z mine.The structures cited in Exhibit S are well away from the excavation area <br /> and no failure is possible that could affect these structures due to distance from the excavation and <br /> the cemented nature of the in situ gravel. <br /> This conclusion is based on the following information: <br /> 1)Greg Lewicki,P.E.,who has 33 years of slope stability experience in Colorado,conducted an inspection <br /> of the current placer pit on October 12,2012. The highwalls were observed carefully.It was noticed <br /> that a significant amount of natural cementing has occurred in the gravel,giving it high strength,even <br /> in steep walls,as shown in the 2 photographs of Section 4 of Exhibit D. A large track hoe needs to <br /> provide significant breakout force to excavate the material. <br /> 2)Mr.Lewicki also has inspected the pre-law highwalls in the same gravel at the Alma Placer Mine, <br /> approximately 2 miles north of this site. These near vertical highwalls are in the same Quaternary <br /> gravels of this site and have been in place for approximately 150 years with no signs of instability <br /> at all. <br /> 3)The near vertical wall immediately south of the Infiltration Pond shows no sign of instability. <br /> 4)No highwall at this site will be present for any extended period of time(over two years)since the <br /> pit will constantly be moving and backfilling behind the active work area.Although it is not necessary, <br /> the operator commits to backfilling any mine slopes to 3H:1 V if they are not backfilled from the mining <br /> operation in that 2 year period.The highwall south of the infiltration pond will require slightly more <br /> time to backfill due to its size. Approximately 4 years are needed to allow for this backfilling.No <br /> work will be occurring at the base of this highwall since it will be filled with fines from the placer <br /> operation. <br /> Gloria Z Mine 2013 Amendment 79 <br />