Laserfiche WebLink
i1 <br />2.2 COAL FINES <br />' 2.2.1 Nature of disposal material <br />' Coal fines are coal particles which are too fine to be economically <br />included in the shipped coal. The actual size which is uneconomic <br />' at the Coal Ridge ~1 mine is not yet known: this will be exactly <br />determined when coal is being shipped. Based on experience with <br />' other coal users, it would appear that coal finer than about 80 to <br />100 mesh will probably be uneconomic to ship. The quantity of such <br />materials is not known at present, but based on experience would <br />' appear to be less than 1$ of the total mine production. This <br />amount will be minimized in production by the use of high speed <br />' centrifugal driers, as it is clearly in NCEC's interests to ship as <br />much coal as possible. <br />' The quality of this fine material is important with respect to <br />' disposal. Because much of the ash and other non-coal materials are <br />fine, they are expected to concentrate somewhat in the finest coal <br />fraction. Accordingly, it is expected that the average <br />' concentration of ash in the coal fines will be about 10~; the other <br />90$ will be coal. <br />' 2.2.2 Method of segreoation <br />' The coal fines are removed from the salable coal by the processes <br />illustrated in Figure 2 above, with the coal fines being the <br />underflow from the thickener. They emerge from this system as a <br />' slurry. <br /> <br />1 <br />' Adrian Brown Consultants <br />-6- <br />1145/900820 <br /> <br />