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4.1 Crushing <br /> Ore is transported by mine cars to the slusher tunnel (Coarse Ore Bin),which has the rail siding above the <br /> crushing gallery. The ore cars are side dumped to an approximate 400-ton coarse ore bin that sits directly <br /> above a plate feeder,which slowly delivers ore to the first conveyor to feed the primary jaw crusher. <br /> Material leaving the primary jaw crusher is approximately—2 1/2". Material is conveyed from the primary <br /> jaw crusher to a 3/4 inch screen. Oversize material from the screen is conveyed to a secondary jaw crusher <br /> and -3/4-inch fines are conveyed to the rod mill for first stage grinding. At both jaw crushers dust is <br /> suppressed using water sprays. The -3/4"materials from the screening and secondary crushing is <br /> delivered to the rod mill along with process water where the ore is ground to p80 of approximately 3/8- <br /> inch minus. <br /> Slurry discharge from the rod mill is delivered via slurry pumping to one of two locations. In the initial <br /> first months to a year of operation the slurry will report to the ball mill discharge tank which then reports <br /> to Derrick screens for sizing. Once final design and construction of two 12,690-gallon slurry retention <br /> tanks are finalized,the slurry will be pumped to those tanks,which will be located in the previously <br /> constructed fine ore bin. The two slurry storage tanks are currently being engineered and will not be in <br /> place when the mill is commissioned. The slurry storage tanks are for surge capacity and the mill can be <br /> started without them. The slurry tanks will be added to the circuit in 2022. A list of tanks described in this <br /> section can be found in Table D-2. <br /> Table D-2 List of Tanks in the Mill <br /> Tank Name Size(gallons) <br /> Slurry Storage Tanks 12,690 EA <br /> Lead Conditioning Tank 1064 <br /> PB Lead cleaner 1st flotation cell 449 <br /> PB Lead cleaner 2nd flotation cell 290 <br /> Lead cleaner column 214 <br /> Lead concentrate filter feed tank 933 <br /> Zinc conditioning tanks 1,064 ea <br /> Zinc Rougher Flotation Cell 1320 <br /> PB Rougher Flotation Cell 1320 <br /> zinc rougher scavenger flotation cells 1,320 EA <br /> Zinc cleaner flotation cells 1,320 Ea <br /> Zinc cleaner column 214 <br /> Zinc concentrate filter feed tank 1,728 <br /> Process water tank 1,800 <br /> Tailings filter feed tank 1,800 <br /> Processes from the rod mill downstream are wet. From the ball mill discharge tank or slurry storage tanks <br /> slurry is pumped to the 2 Derrick stack sizer screens,which size to p80 of-130 micron. These screens <br /> replaced the previously used hydro cyclone. Undersized material is sent to the Pb conditioning tank <br /> (1,064 gallons). Oversize material is circulated to the ball mill where it is ground and returned to the <br /> screens for sizing. The ball mill reduction takes place in a wet enclosed ball mill. Sodium metabisulfite <br /> Revenue Mine <br /> Amendment 02 D-10 <br /> December 2021 <br />