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0 <br />Table 85 <br />TYPICAL OVERBURDEN SWELL FACTOR VALUES <br />Reported Rock Lithology Swell Factor Reference <br />Sandstone <br />1.20 <br />Hunter, 1974 <br />Shale <br />1.10 <br />Hunter, 1974 <br />Shale and Sandstone <br />1.70 <br />Kenny, 1969 <br />Hard Sandy Marl <br />1.45 <br />Stuna & Meyer, 1960 <br />Thick Sandstone <br />1.30 <br />MSEI <br />Laminated Sandstone <br />1.50 <br />MSE2 <br />Sandstone <br />1.50 <br />Pfleider, 1968 <br />Shale <br />1.33 <br />Pfleider, 1968 <br />Shale and fine - grained Sandstone <br />1.50 - 1.70 <br />Ropski & Lama, 1973 <br />NOTES: <br />1. MSE observations on longwalls at York Canyon Mine, New Mexico <br />2. MSE observations on longwalls in western Colorado <br />