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<br />' <br /> The performance of the segregation system i s not presently known. <br />' However it is expected that the hangingwall material will be able <br />' <br />i <br />i <br />i <br /> to be segregated from the coal reasonably s <br />n NCEC <br />s <br />well ( <br />t <br /> interests to maximize segregation, in order to maximize shippable <br />' coal). It is therefore expected that the material obtained for <br /> disposal will average about 90$ non-flammable material, and 10$ <br />' flammable material. <br />2.1.3 Expected quantity of material <br />' The over-excavation of the hangingwall is controllable by the <br />monitor operator, by observing the nature of the material that is <br />' passing the monitor in the flume. Accordingly, it is expected that <br />as soon as the material being delivered has a visually detectable <br />' amount of hangingwall rock within it, the nozzle direction will be <br />changed, or the mining will be considered to be complete at the <br />' current monitor location, and a monitor move will be undertaken <br />according to the proposed mining cycle. <br />Experience in Canadian hydraulic mines indicates that the operator <br />generally becomes aware of the presence of hangingwall material in <br />the flume when the rock constitutes about 10$ of the total solids <br />in the flume water (that is when the mix of solids is 90$ coal, 10$ <br />' rock). For the majority of the time in any monitor cycle only coal <br />is exposed to be mined, so that it is relatively rare that <br />' hangingwall material is available to be dislodged. Combining these <br />two factors leads to the result that the hangingwall rock that <br />' would be expected to be produced is about 2$ by weight of the coal <br />produced. At a peak production rate of 1,000,000 tons of coal per <br />year, this constitutes a production of about 20,000 tons of <br />' hangingwall rock per year. <br />1 <br />' Adriaa Brown Consultants -5- 1145/900820 <br />1 <br />