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Following the Zn concentrate thickener,the concentrate goes to the Zn concentrate filter feed tank(1,728 <br /> gallons). The concentrate is then pumped into the Zn concentrate filter to remove excess water.Water is <br /> either sent to the Zn concentrate thickener or the filtrate water tank depending on recovery/concentrate <br /> grade. The Zn concentrate cake created by the filter is then sent to a screw conveyor which feeds the Zn <br /> concentrate bagging system where the concentrate is placed in a super sack and transported off site for <br /> sale. An SDS accompanies the bagged product to final delivery. Offtake is sold to a third-party FOB <br /> mine warehouse. OSMI relinquishes possession of the product once the bags are loaded for shipment. <br /> 4.4 Tailings <br /> Tailings from the Zn rougher scavenger flotation cells report to the tails filter feed tank or the tails <br /> thickener depending on the water content of the slurry. If additional water needs to be removed the tails <br /> will go to the tailings thickener. The tailings can be recirculated through the tailings thickener if need be <br /> before being sent on to the tailings filter feed tank(18,000 gallons). <br /> The tailings filter feed tank reports to the tailings filter presses. Here the water is squeezed out of the <br /> tailings and the filter cake is allowed to drop down into two concrete floor bays,where a front-end loader <br /> loads the filter cake out for permanent placement in the Revenue or Atlas tailings storage facilities <br /> (TSFs). The tailings from the filer presses will be approximately 13-20%moisture,which is appropriate <br /> for good compaction in either of the two permanent TSFs in the permit area. Tails will be compacted with <br /> a percentage of waste rock in accordance with OSMI's tailings management plan. <br /> The water removed from the tailings is recycled back into the process water circuit to be used in the mill <br /> process. The mill will start without a water treatment facility. After the mill process has been refined <br /> during commissioning and actual water chemistry is known,then a zero-discharge mill water conditioning <br /> facility will be installed in the mill. <br /> 5 SURFACE FACILITIES <br /> Surface facilities used to support underground operations are shown on Maps C-la and C-lb. Minor <br /> changes may be made to the proposed layouts during construction; however, construction activities <br /> including earthmoving activities are confined to the affected lands boundary. The majority of material <br /> excavated underground will be processed in the mill,but approximately 20%will be hauled out of the <br /> mine portal as waste rock to be stored in the waste embankment or crushed and sold as road base. <br /> A list of facilities on the surface includes: <br /> • 2 Tailings Storage Facilities (Revenue TSF and Atlas TSF) <br /> • Temporary waste rock stockpile area <br /> • Topsoil stockpile area <br /> • Passive Water Treatment System -Mine Water Pond, Pond 42, and Pond#3 <br /> • Avalanche protection buffers and cribbing <br /> • 2 Mine Equipment Storage Warehouses <br /> • Mine offices (Administrative Building) on 6"concrete foundation <br /> • Mine access road(compacted gravel) <br /> • Compressor Building on 6"concrete foundation <br /> • Solid waste storage bins (for trash). <br /> • 3 Ventilation shafts (2 of 3 are proposed and none connected to the main surface facility area) <br /> • 2 power poles <br /> Revenue Mine <br /> Amendment 02 D-12 <br /> December 2021 <br />