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Processes from the rod mill downstream are wet. From the ball mill discharge tank or slurry <br /> storage tanks slurry is pumped to the 2 Derrick stack sizer screens,which size to p80 of-130 <br /> micron. These screens replaced the previously used hydro cyclone. Undersized material is sent to <br /> the Pb conditioning tank(1,064 gallons). Oversize material is circulated to the ball mill where it <br /> is ground and returned to the screens for sizing. The ball mill reduction takes place in a wet <br /> enclosed ball mill. Sodium metabisulfite (pH control & Zn suppressant),Zinc Sulfate (Zn <br /> suppressant), and Lime (pH adjustment) are introduced into the process in the ball mill. <br /> 3.8 Lead Circuit <br /> In the Pb conditioning tank, process water,Aerofloat 242,Aerophine 3418A, and MIBC are <br /> added to promote the flotation of Pb and Ag while depressing the Zn to prepare for the <br /> concentrate separation in the lead rougher flotation cell (1,320 gallons). The rougher flotation <br /> cell mixes air into the slurry with a rotor so that Pb adheres to the bubbles and floats to the <br /> surface. The rougher flotation cell feeds tailings from the bottom of the cell into Pb rougher <br /> scavenger flotation cells,which consist of two sets of tanks (1,320 gallons each)with three rotors <br /> in each tank(these tanks will also have two products - a concentrate and tailings). The <br /> concentrate goes to the Pb cleaner flotation cell. The tails from rougher scavenger cells report to <br /> the Zn rougher feed. The concentrate comes off the top of the rougher flotation cell and is fed to <br /> the Pb cleaner flotation cell or Pb cleaner column determined by recovery/concentrate grade. <br /> The slurry then enters Pb cleaner flotation cells (unless bypassed to the Pb cleaner column) <br /> which consist of two banks that both have two tank cells (1st cell is 449 gallons, 2nd cell is 290 <br /> gallons). This step also creates two products—concentrate and tails. The concentrate reports to <br /> the Pb cleaner flotation columns. The tails from bank 91 tank 91 report to the bank 92 tank 91. <br /> Tails from bank 91 tank 92 goes to bank 92 tank 92. Tails from bank 92 tank 91 goes to bank 91 <br /> tank#2. Bank 92 tank 92 tails report to the Zn rougher conditioning tank. Concentrate from the <br /> Pb cleaner flotation cells reports to the Pb cleaner column (214 gallons). Like all other tanks in <br /> the circuit, the Pb cleaner column creates both a concentrate and a tail. The tails from the Pb <br /> cleaner column are pumped back into the Pb cleaner flotation tank cell 91. The concentrate from <br /> the Pb cleaner column reports to the Pb concentrate thickener. Process water and flocculant are <br /> added to the slurry at the Pb concentrate thickener. <br /> After the Pb concentrate thickener,material reports to the Pb concentrate filter feed tank (933 <br /> gallons). From the Pb concentrate filter feed tank, the concentrate is pumped to the Pb <br /> concentrate filter. Water removed from this step is sent to the filtrate water tank. The Pb <br /> concentrate is sent to a screw conveyor that feeds the bagging system. Once bagged the Pb <br /> concentrate is trucked off site to be sold. An SDS accompanies the bagged product to final <br /> delivery. Concentrate is sold to a third-party FOB mine warehouse. OSMI relinquishes <br /> possession of the concentrate once the bags are loaded for shipment. <br /> Revenue Mine <br /> Amendment 02 D-13 <br /> Updated August 2022 <br />