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The mining operations within Revenue may bring new water into the mine, so Star Mine <br />Operations feels it is a best management practice to take steps to improve the mine water discharge <br />quality. Additionally, the mine water will be used in the mill operations, so cleaner mine water will <br />be beneficial to processing. <br />1.3 Mine Tailings and Waste Rock Disposal <br />a) Mill Tailings <br />As described in the mine plan, mill tailings from the underground mill are planned to be produced <br />at a rate of approximately 80,000 tons per year. The ore will consist of approximately 1 foot thick <br />of quartz vein host rock and approximately 3.5 feet of wall rock which allows room for men and <br />equipment. The quartz veins have 4 minerals of interest: <br />galena (PbS) <br />sphalerite (ZnS) <br />chalcopyrite (CuFeS2) <br />Tetrahedrite (Cu12Sb4S13) with a variant freibergite which has some silver (Ag) replacing <br />some of the copper. <br />The other minerals present in the vein (which make up most of the mass) are inert quartz and other <br />host materials. <br />It is expected that these minerals will comprise approximately 20 -40% of the vein material. The <br />wall rock around the veins is primarily andesite, which is a very fine granite, consisting of quartz, <br />feldspar, amphiboles, biotite and muscovite mica. Since the milling process will primarily extract <br />the sulfide minerals, the tailings will consist of quartz, feldspar, amphiboles, biotite and muscovite, <br />which are inert minerals. <br />This tailing material will be very fine in size, since it will be produced from ball milling and <br />flotation cells. Filters will be used to extract water from the tailings, and this water will be recycled <br />in the mill. The tailings will be delivered outside by a 24" wide or smaller rubber conveyor that will <br />Revenue Mine August 2012 T - <br />