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<br /> <br /> <br /> <br /> <br />• The combination of the moderately dipping foliation and various joint set orientations creates <br />• the potential for localized areas of block raveling. The sections of poor rock observed in the <br />th <br />fr <br />i <br />i <br />li <br /> ese <br />om <br />ng <br />ty ar <br />s <br />2007 mined areas in the North Quarry are localized areas and instabi <br /> features is anticipated to be contained on bench surfaces. Based on our observations the <br />• overall slope conditions are considered stable, and warrant only operational considerations. <br /> Mining began in the South Quarry in 2007 and as such, full highwall and bench development <br />• has not been achieved. Rock observed in the highwall was competent biotite gneiss, <br />• moderately to highly weathered due to surface proximity. Highwall orientations are <br />ect to <br />ith <br />bl <br />f <br /> resp <br />e w <br />avora <br />approximately north to south and foliation and joint orientations are <br /> this highwall development plan. While there is a potential for minor toppling, the overall slope <br />• condition is stable. Therefore, it is likely that slopes excavated steeper than the default <br /> configuration (1:1 H:V) would have a low potential for slope instability. <br />• <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> -8- <br />• f:\3919_038Wnnual_Rcpott_2007\Gcotcch_Addcndum_2007\Annual_Rcport_2007_Gcotech.doc April 2008 <br /> <br /> <br /> <br />