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L.R. Perino ► Page 13 __aril 27, 1993 <br /> Table 2. Historical record of bulkhead life <br /> Mine Length Year Elapsed Hydraulic Pressure <br /> (ft) Built Years Pressure Gradient <br /> (psi) (psi/ft) <br /> CMR-6 Shaft 9 Level 17 1953 40 360 21.2 <br /> West <br /> East Daggerafontein 28 1949 44 650 23.2 <br /> 30 Haulage North <br /> and South <br /> 2 bulkheads <br /> Virginia 31 Haulage 63 1957 36 1650 26.2 <br /> South <br /> Free State Geduld 46 1955 38 828 18.0 <br /> 47 Level <br /> Govt. G.M. Areas 5 1945 48 100 20.0 <br /> Sub Nigel 11 1953 40 199 18.0 <br /> West Dreifontein 60 1968 25 1620 27.0 <br /> 10 & 12 Levels <br /> 4 bulkheads <br /> Rocanville 87 1985 8 1300 14.9 <br /> Walker 700 Level 15 1987 15 300 8.7 <br /> Friday Lowden 14 1990 3 290 20.7 <br />