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hillside),providing the ideal geometry so that planes of weakness along the foliation(potential <br /> slip planes) cannot slide westward into the pit off the highwall. This observed structural <br /> condition is consistent with what Brierley noted in their 2004 report. <br /> Conversely, in one instance (Figure 2) where the foliation is upturned in a fluidized structure. <br /> Because this places the foliation planes (potential slip planes) at a much steeper dip,these can <br /> slip, and behave essentially like smooth joints or fractures. These are non-systematic and <br /> therefore only create local stability issues. There is no way of predicting when these <br /> metamorphic features may change strike or dip,but at present,the highwall and strike and dip of <br /> the foliation are, in my opinion, at a close to ideal configuration over most of the highwall <br /> exposure. Problems with features like that in Figure 2 can be scaled down or dealt with on a case <br /> by case basis when encountered. <br /> ;. + <br /> c +►� t p. <br /> 3 ,k <br /> l f• ' <br /> fat <br /> Mime to Inn or nae,Y.,c or r;rw- ._,,,, � ,. . _:, .•ag t i r..m ,h1 <br /> t 'OrScd lv t <br /> pear unfit,t tan?ttp pnpi•;:.Sana tfllai granIn lad.;I r+7 phtiY <br /> xnlrclwnf <br /> meter of 61w*thnwn figats:rk>sp,ed. <br /> + i'Rk'ha!tt,413k-14 irllphitn,1 N unnk iR W...I M(hwall. <br /> FIGURE 1. Pit highwall on april 28,2019,viewed to the east-southeast. The foliated,dominantly biotite gneissic units clearly dip <br /> to the east-northeast into the hill/highwall,except in the area shown in figure 2. <br /> Figure 1 —Pit Highwall Example <br /> Shaffers Crossing TR 3 <br /> .rev,I RWICId and:%ssoriau s.I'I.1 <br />