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Sanborn Creek Project Paqe 9 August 21, 1992 <br />• Table 2. <br />BANK DENSITY. SHELL FACTOR AND PERCENT FREE SWELL <br />FOR SELECTED ROCKS ANO SOILS <br />Adapted from: Caterpillar. Inc.. 1987. Caterpillar performance <br />handbook. p 740 <br />Euclid Road Machinery Co.. 1953. Estimating <br />production and costs <br />Rock or Soil Bank Density Swell Factor Free Swell <br /> (PCF) (Percent) <br /> <br />0asait I85 0.67 SOZ <br />Bauxite II9 0_75 33X <br />Caliche !41 0_55 82Z <br />Carnotite, primary uranium 137 0.74 35X <br />Clay, natural 126 0.82 22Z <br />Coal, anthracite 100 0_74 35Z <br />bituminous 80 0.74 35Z <br />Concrete I20-I55 0.72 40Z <br />Conglomerate !53 0_72-0_63 40-60Z <br />• <br />Copper are, altered siliceous 141 0.74 35Z <br />Earth, wet 126 0.79 271 <br />loam 96 0.81 23X <br />Granite. quartzite. fresh 163-170 0.67-0.56 SO-80Z <br />- typical values (0.61) (64Z) <br />Gravel, p(trun l35 0.89 12Z <br />Gypsum 198 0_57 75X <br />Iron ore. hematite, hi-grade 174-237 0.58-0_SS 72-82Z <br />limonite 174-237 0_58 72X <br />magnetite 204 0.58-0_55 72-82Z <br />taconite 192-226 0_58 72X <br />Lead ore 465 <br />Limestone I55-163 0.60-0.57 67-75X <br />typical values (0.59) (69X) <br />Marble, metamorphic 170 0.60-0.57 67-75X <br />Montmorillontte. chlorite. 14! 0.77 30X <br />kaolin. i11ite. smektlte <br />Phosphate 200 <br />Pyrite I89 0.85 18X <br />Sand. dry 100 0.89 12X <br />damp l20 0_89 12X <br />wet 130 0.89 I2X <br />Sandstone l53-157 0.60 67X <br />Shale, mudstone I04 0.75 33Z <br />Siltstone. hard I53-157 0.60-0.57 67-75X <br />soft 126 0.82 22X <br />Slate 170-180 0_77 30X <br />• <br />Traprock, basic igneous 163 0.67 SOZ <br />Percent free swell = Change in volume broken as a percent of <br />original bank volume <br />Swell factor Broken density/Bank density <br />