2021-12-07_REVISION - M2012032 (25)

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(pH control&Zn suppressant),Zinc Sulfate (Zn suppressant), and Lime (pH adjustment)are introduced into the process in the ball mill. 4.2 Lead Circuit In the Pb conditioning tank,process water,Aerofloat 242,Aerophine 3418A, and MIBC are added to promote the flotation of Pb and Ag while depressing the Zn to prepare for the concentrate separation in the lead rougher flotation cell(1,320 gallons). The rougher flotation cell mixes air into the slurry with a rotor so that Pb adheres to the bubbles and floats to the surface. The rougher flotation cell feeds tailings from the bottom of the cell into Pb rougher scavenger flotation cells which consist of two sets of tanks (1,320 gallons each)with three rotors in each tank(these tanks will also have two products -a concentrate and tailings). The concentrate goes to the Pb cleaner flotation cell. The tails from rougher scavenger cells report to the Zn rougher feed. The concentrate comes off the top of the rougher flotation cell and is fed to the Pb cleaner flotation cell or Pb cleaner column determined by recovery/concentrate grade. The slurry then enters Pb cleaner flotation cells (unless bypassed to the Pb cleaner column)which consist of two banks that both have two tank cells (1st cell is 449 gallons, 2nd cell is 290 gallons). This step also creates two products—concentrate and tails. The concentrate reports to the Pb cleaner flotation columns. The tails from bank 41 tank 41 report to the bank 42 tank 41. Tails from bank 41 tank 42 goes to bank 42 tank 42. Tails from bank 42 tank 41 goes to bank 41 tank 42. Bank 42 tank 42 tails report to the Zn rougher conditioning tank. Concentrate from the Pb cleaner flotation cells reports to the Pb cleaner column(214 gallons). Like all other tanks in the circuit,the Pb cleaner column creates both a concentrate and a tail. The tail from the Pb cleaner column are pumped back into the Pb cleaner flotation tank cell 41. The concentrate from the Pb cleaner column reports to the Pb concentrate thickener. Process water and flocculant are added to the slurry at the Pb concentrate thickener. After the Pb concentrate thickener,material reports to the Pb concentrate filter feed tank(933 gallons). From the Pb concentrate filter feed tank,the concentrate is pumped to the Pb concentrate filter.Water removed from this step is sent to the filtrate water tank. The Pb concentrate is sent to a screw conveyor that feeds the bagging system. Once bagged the Pb concentrate is trucked off site to be sold. An SDS accompanies the bagged product to final delivery. Concentrate is sold to a third-party FOB mine warehouse. OSMI relinquishes possession of the concentrate once the bags are loaded for shipment. 4.3 Zinc Circuit The tails from the Pb circuit are sent to the Zn conditioning tanks (1064 gallons each)where lime from the recirculation circuit is added for a pH adjustment along with CuSO4, Oreprep, and xanthate to promote the flotation of zinc and to prepare for the concentrate separation in the Zn rougher flotation tank cell(1,320 gallons). The rougher flotation cell mixes air into the slurry with a blower so that Zn can adhere to the bubbles and float to the surface. A concentrate is collected off the top the Zn rougher flotation tank cell and sent to the Zn cleaner flotation cells. Tailings from the bottom of the Zn rougher flotation tank cell report to the Zn rougher scavenger flotation cells. The Zn rougher flotation cells consist of two banks (1,320 gallons each). The concentrate from the Zn rougher scavenger flotation cells reports to the Zn cleaner flotation cells along with the concentrate from the Zn rougher flotation tank cell. The Zn cleaner flotation cells consist of two banks (1,320 gallons each). Tailings from the Zn cleaner flotation cells report back to the Zn conditioning tank and the concentrate that is produced in this step goes to the Zn cleaner flotation column(214 gallon). The concentrate that is removed from the top of the Zn cleaner flotation column reports to the Zn concentrate thickener. The tailings that are produced by the Zn cleaner flotation column is sent back to the Zn cleaner flotation cell or the Zn conditioning tank, determined by recovery/concentrate grade. Revenue Mine Amendment 02 D-11 December 2021