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• 1 minus 882 620 <br />P equals ?(86)(402) 1 plus ,88295 (62 equals 4265 <br />26 40 <br />R equals 2 (86)(1.0) equals 44720 <br />44720 <br />G equals ~ 4~5 equals 10,48 <br />The south high•.+all backi'ill will be stable as proposed, The sout~i <br />highwall has an average slope of 1:1,25 (50°) and a maximum height of 40~. <br />Dimensions are given in Afass Balance Demonstration, King Coal ldine, La <br />Plata County, Colorado (M.L.R.B. Stipulation), dated N.ap 29, 1982. <br />Formulas to determine stability of the south highwall are the sane <br />as those used for the tipple highwall: <br />See diagram pg, 7 <br />1 minus 76604 <br />P equals x(86)(402) 1 plus .7~4 eouals 9114 <br />• 18 28 <br />R equals 2 (86){1,0) equals 21672 <br />21672 <br />G equals 9114 equals 2.38 <br />2) Afaterial strength <br />The fill material is mine xaste consisting of quartz sandstone with <br />calcareous to slightly ferruginous cement and minor argillaceous and car- <br />bonaceous shale partings, <br />Relative toughness; 1.5 <br />Ft. lb/ ft2 of fracture; 312.4 <br />Compressive strnegth, lbs/ sq, in; 9500 (no partings) <br />Compressive strength, lbs/ sq, in; 8400 (partings) <br />Compaction; 12,5' <br />• (6) <br />