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MINING AND RECLAMATION PLAN January, 1986 <br />MT. GUNNISON N0. 1 'NINE <br />South Prong Creeksdill be constructed and seal length in these areas is 614 <br />feet and 3.2 feet respectively. Concrete seals will be of tapered plug shape <br />and the seals will be well keyed into the mine openings. <br />It should also be n~~ted that the maximum calculated stress on the sFaals is 758 <br />psi and a safety fa~:tor 3 is used in developing the design curves shown in <br />Exhibit 3.5.2.R3, 4, and 5. The concrete seal with compressive strength of 4000 <br />psi and a stress of 758 psi would yield a safety factor of 5.3. ThEa designed <br />seals will be able 'to withstand the applied forces with comfortable safety <br />factors. <br />As the mine is developed. additional geologic and hydrologic data wiill be <br />collected and the weal design will be re-evaluated before construction. <br /> <br />3-88 <br />