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MINING AND RECLAMATION PLAN January, 1986 <br />MT. GUNNISON N0. 1 MINE <br />TABLE 3.5.2.T2 ROCK PROPERTIES DATA <br />PROPERTIES ROCK TYPE <br />ROOF FLOOR <br />(Sandstone, Shale) (Shale) COAL F SEAM <br />UNCONFINED COMPRESSIVE <br />STRENGTH (psi) <br />- mean 15,799 5,755 2,698 <br />- S. D. 6,796 3,755 738 <br />- C. V. 0.43 0.65 0.27 <br />- min 7,605 1,490 1,970 <br />- max 29,372 8,562 3,650 <br />SHEAR STRENGTH (psi) <br />- mean 7,900 2,878 1,349 <br />- min 3,803 745 945 <br />- design 3,800 750 1,000 <br />DESIGN SHEAR STRENGTH (psi) <br />(Weighted Average) <br />2,000 <br />Roof, Floor & Coal <br />750 <br />Without Flaor <br />Use psi in Design <br /> <br />3-85 <br />