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- REGRADED TOPOGRAPHY - <br />- ORIGINAL TOPOGRAPHY - <br />I <br />TOTAL BANK OVERBURDEN <br />AND PARTINGS <br />- TOP OF COAL - <br />TOTAL COAL THICKNESS <br />- PIT FLOOR - <br />Lg <br />AREA swell = ( DEPTHswell)(LENGTHsectlon) <br />AREAbank = ( DEPTH bank )(LENGTH section) <br />PERCENT SWELL FACTOR = [(A, / Ab) -~ 100 <br />db <br />t <br />d <br />ILLUSTRATIVE CROSS SECTION <br />