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through a Knelson gravity concentrator for recovery of any dense heavy minerals. The material <br />which comes out of the Knelson will be sent through a flash flotation cell to recovery any sulfide <br />minerals which are liberated but coarser than 150 mesh. The flash flotation tailings will be sent <br />back to the ball mill for further closed circuit grinding. <br />Flotation Circuit <br />The flotation circuit will take the cyclone oversize (80 percent passing 150 mesh) and send it into a <br />conditioning tank which has a retention time of 8 minutes. The conditioning tank will blend the <br />material with necessary chemicals before sending it to rougher flotation. The rougher flotation will <br />take the material from the conditioning take and remove the sulfide minerals. The rougher float <br />cells will be 100 cubic feet each and a bank of 8 cells will be utilized with each having a retention <br />time of approximately 1 minute. The tailings from the rougher flotation will be sent to the <br />scavenger flotation conditioner tank. The product from the scavenger condition tank will be sent to <br />the scavenger cells which will attempt to recover any remaining desired sulfide minerals to the <br />concentrate for blending with the rougher concentrates. The scavenger flotation will also have 8 <br />cells of 100 cubic feet each with approximately 1 minute retention times. The tailings from the <br />scavenger cells will be the final tailings. The blended concentrates from the flash flotation, rougher <br />flotation and the scavenger flotation will be sent to bulk concentrate grinding prior to cleaner <br />flotation. The re -grind of the bulk concentrate will help to ensure complete liberation of the sulfide <br />minerals from the undesired minerals. The product from the re -grind will be sent to a bulk <br />concentrate conditioner tank. The product from the conditioner will be sent to smaller, 18 cubic <br />foot cleaner flotation cells. The concentrate from the cleaner cells will be sent to the sulfide <br />mineral separation conditioner tank while the tailings from the cleaner flotation will be returned to <br />the rougher flotation conditioner tank. The product from the sulfide mineral separation conditioner <br />tank will be sent into a first bank of 15 cubic foot cells which will separate the sphalerite from the <br />other sulfide minerals. The sphalerite contains all of the zinc in the process and will produce a final <br />sellable zinc concentrate. After the sphalerite separation the remaining sulfide materials can either <br />be sold or further processed for separation of the galena and the tetrahedrite. For separation of the <br />minerals the material will be sent to a second sulfide mineral separation conditioner tank. The <br />product from the conditioner tank will be sent to a second bank of 15 cubic foot cells for flotation <br />Revenue Mine August 2012 T -24 <br />