Laserfiche WebLink
3.9 Zinc Circuit <br /> The tails from the Pb circuit are sent to the Zn conditioning tanks (1064 gallons each)where lime <br /> from the recirculation circuit is added for a pH adjustment along with CuSO4, Oreprep, and <br /> xanthate to promote the flotation of zinc and to prepare for the concentrate separation in the Zn <br /> rougher flotation tank cell (1,320 gallons). The rougher flotation cell mixes air into the slurry <br /> with a blower so that Zn can adhere to the bubbles and float to the surface. A concentrate is <br /> collected off the top the Zn rougher flotation tank cell and sent to the Zn cleaner flotation cells. <br /> Tailings from the bottom of the Zn rougher flotation tank cell report to the Zn rougher scavenger <br /> flotation cells. The Zn rougher flotation cells consist of two banks (1,320 gallons each). The <br /> concentrate from the Zn rougher scavenger flotation cells reports to the Zn cleaner flotation cells <br /> along with the concentrate from the Zn rougher flotation tank cell. <br /> The Zn cleaner flotation cells consist of two banks (1,320 gallons each). Tailings from the Zn <br /> cleaner flotation cells report back to the Zn conditioning tank and the concentrate that is <br /> produced in this step goes to the Zn cleaner flotation column (214 gallon). The concentrate that <br /> is removed from the top of the Zn cleaner flotation column reports to the Zn concentrate <br /> thickener. The tailings that are produced by the Zn cleaner flotation column is sent back to the <br /> Zn cleaner flotation cell or the Zn conditioning tank, determined by recovery/concentrate grade. <br /> Following the Zn concentrate thickener, the concentrate goes to the Zn concentrate filter feed <br /> tank(1,728 gallons). The concentrate is then pumped into the Zn concentrate filter to remove <br /> excess water. Water is either sent to the Zn concentrate thickener or the filtrate water tank <br /> depending on recovery/concentrate grade. The Zn concentrate cake created by the filter is then <br /> sent to a screw conveyor which feeds the Zn concentrate bagging system where the concentrate <br /> is placed in a super sack and transported off site for sale. An SDS accompanies the bagged <br /> product to final delivery. Offtake is sold to a third-party FOB mine warehouse. OSMI <br /> relinquishes possession of the product once the bags are loaded for shipment. <br /> 3.10 Tailings <br /> Tailings from the Zn rougher scavenger flotation cells report to the tails filter feed tank or the <br /> tails thickener depending on the water content of the slurry. If additional water needs to be <br /> removed the tails will go to the tailings thickener. Currently the tailings thickener tank is not <br /> housed within a building. OSMI is proposing to construct a Tailings Thickener super structure to <br /> cover the tank and secondary containment to protect the facility from the elements. The proposed <br /> footprint of the super structure aligns with the concrete walls that make up the secondary <br /> containment. Therefore, no new disturbance is planned as part of the construction. The building <br /> will be constructed of steel beams and corrugated metal siding to match the other buildings at the <br /> site and to withstand snowpack and winds. Preliminary designs and building dimensions are <br /> provided as Attachment 3. Stamped drawings for construction will be provided in advance of <br /> construction. The tailings can be recirculated through the tailings thickener if needed before <br /> 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 <br /> the tailings and the filter cake is allowed to drop down into two concrete floor bays,where a <br /> front-end loader loads the filter cake out for permanent placement in the Revenue or Atlas <br /> Revenue Mine <br /> Amendment 02 D-14 <br /> Updated August 2022 <br />