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<br />w~ <br />- REGRADED TOPOGRAPHY - <br />- ORIGINAL TOPOGRAPHY - <br />• <br />TOTAL BANK OVERBURDEN <br />AND PARTINGS db ds <br />-TOP OF COAL - <br />TOTAL COAL THICKNESS <br />- PIT FLOOR - <br />Ls <br />AREA swell = (DEPTHswell)(LENGTHsection) <br />AREAbank = C DEPTHbank )(LENGTHsection) • <br />PERCENT SWELL FACTOR = [(A, / Ab) -~ 100 <br />ILLUSTRATIVE CROSS SECTION <br />