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• The fill material will be cut a~ backfilled from the outer edge <br />of the existing mine bench to establish desired configuration, The <br />material is composed of grey to dark grey shale, carbonaceous shale <br />partings and medium grained sandstone. All material to be used will <br />be derived from the Menefee Formation <br />EMPLACEMENT <br />The fill will be emplaced by bulldozer. front-end loader a~ if' <br />necessary a sheep's foot roller, <br />STABILITYi <br />The highrall x111 be stable as roposed, The resulting backfill will ~ °~~~ ~~Dni~ <br />have an average slope of 2i1 (22.5' and a maximum height of 29 feet. "~ ~~6~`~'`' <br />/{-A~ ON <br />Stability xas determined from Terzaghi'e formula i M,~6~ 0 ~ <br />Stability (C )s resisting force ~- <br />driving force <br />When <br />C less than 1 = unstable slope, <br />G greater than 1 = stable slope, <br />• G equals 1 = slope in equilibrium. <br />Resisting force is equal to the weight per lineal foot times <br />the coefficient oY friction of the materiel in question. <br />R h Z l z w x coefficient of friction <br />Where R = resisting force, reslstance~ £oot of length, <br />h = vertlcle height of resisting force, <br />1 = length to toe of fill, <br />x = xeight of fill ~ foot of length , <br />Driving force is derived from Rankiner's formula: <br />P= (,5) x xx h2 x11 4Sin0) <br />Where P = driving force, pressure foot of length, <br />x = weight of fill ~ cubic foot, <br />• h = height of fill ; <br />0 = angle of repose of material. <br />(2) <br />