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of slusher drifts are driven perpendicular to the haulage drifts. <br /> On both sides of these slusher drifts, finger raises inclined at <br /> 45 degrees are driven to the stope elevation. A series of sub- <br /> drifts are driven parallel to the slusher drifts, but over the <br /> tops of the finger raises. From the subdrifts a series of fan <br /> shaped drill patterns are drilled up into the solid ore. These <br /> holes are loaded with a blasting agent and detonated. The result- <br /> ing broken rock is gravity drawn into the finger raises from <br /> where it is dragged to, and through, a drawhol.e in the slusher <br /> drift over the haulage drift into waiting muck cars. Electric <br /> locomotives pull the loaded muck cars to the Storke surface <br /> crushing plant or to the 600 Level underground crushing plant. <br /> When the blasted ore has been removed, the overlying <br /> • ore caves by its own weight, and the process continues until the <br /> overlying 300 foot ore column is exhausted. <br /> Presently, the majority of underground ore comes from <br /> the Storke Level. The 600 Level, located 300 feet below Storke, <br /> supplies the balance of underground ore. As the Storke Level ore <br /> is gradually exhausted, the 600 Level will supply a greater <br /> proportion until about 1984 when it will be the sole underground <br /> ore producer. A third underground level, the 900 Level is pro- <br /> posed to come into production during the mid-1990 ' s. The Ceresco <br /> Level was mined during the 1960 ' s. It may be reopened during the <br /> late 1980 ' s. <br /> Most underground equipment is powered by electricity or <br /> compressed air. However, present plans call for an increased use <br /> 2-9 <br />