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<br />Erosion of the cut highwalls is minor. Total area of contributing <br />drainage for each cut has been calculated as follows: <br />tipple highwall, 1.41 acres (61,220 ft2) <br />south highxall, 1.24 acres (53,875 ft2) <br />See Geologic Plan <br />b) Slope stability of fill: <br />Characteristics: <br />The fill material will be mine waste rock composed of dense, medium- <br /> <br />grained sandstone with occasional shale and carbonaceous shale partings, <br />all of the N,enefee Formation, Mesa Verde Group, Upper Cretaceous age. <br />Average Size Tenor <br />Material above 6" 20~ by xeight <br />Material above 4" <br />Material above 2" <br />Material above 4 mesh# <br />Material above 10 mesh <br />30;6 by weight <br />30,`b by weight <br />10~ by xeight <br />SQ by xeight <br />Material above 40 mesh# <br />Material above 200 mesh# <br />~ U.S. Series equivalent screen sizes <br />Emolacemer~t <br />less than 5~ by xeight <br />less than 5~ by xeight <br />haste will be placed with a front-end loader and compacted in two <br />foot lifts with a bull dozer. If necessary, compaction xill be done with <br />a sheep's Soot roller. <br />Stability• <br />The tipple highxall backSill xill be stable as proposed. <br />• <br />The tipple highwall bac}Sill will have an avera£e slope of 1:2 (620) <br />(3) <br />