2024-06-10_REVISION - M2012032 - Laserfiche WebLink

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m N XC m 3. PROCESS DESCRIPTION Material is to be blended from both the Camp Bird Mine and Revenue Mine. The feed ore, in a range of-40 mesh to -6 inches, is fed into an electrically driven jaw crusher at a rate of 10 tons per hour and crushed to nominally minus s/. inches or less. Discharge from the jaw crusher is hopper fed into an electrically driven 15 horsepower Roll Mill disc grinder(the "Roll Mill"). Discharge from Roll Mill is 80% passing at-80 mesh. Material over- 80 mesh is recirculated back through the Roll Mill until a-80 mesh screen size is achieved. Roll Mill discharge is fed into an electrically driven to a 40 horsepower, 5'x 8' Patterson Ball Mill (the "Ball Mill"). Process water and ground material are simultaneously introduced into the Ball Mill at a rate of 5.7 USGPM, creating a slurry of 66 percent concentration based on the weight of the process water and material. Material is further processed to nominally-140 mesh, discharging from the Ball Mill and fed to a conditioning tank for dilution down to nominal percent by weight. The purpose of a conditioning tank is to reduce slurry concentration from 66 percent solids by weight down to nominally 14 percent to 22 percent solids by weight with the introduction of additional water to accomplish the desired dilution. The tank has a capacity of 1000 US gallons and will be slightly elevated to allow bottom discharge to the wet shaker table. The material of construction shall be high-density Polyethylene,fitted with an electrically driven top-mount mixing style agitator to maintain precise slurry concentrations. Bottom discharge piping shall include a manual direct read flow meter for flow control across the wet shaker table. Discharge from the conditioning tank shall feed material to a series of Deister 6-RH-SA Wet, Shaker Tables, 2 '/z horsepower ("Shaker Tables"). This provision ensures laminar flow across Shaker Tables, dramatically affecting recovery efficiencies of dissimilar metals and mineral species in a standard flow stream. Segregated and collected material discharged from Shaker Tables shall be recovered in multiple receptacles, i.e., non-metallic barrels, for content analysis. Wet material shall be pumped as slurry into an 800-millimeter Micronics Filter Press ("Filter Press")for moisture removal,and that liquid,discharge,and material shall be analyzed for mineral and metal content. The moisture content of filter cake is anticipated to be less than 12 percent. The recovery metals shall be dried and loaded into 'super-sacks,' and discharge water from the Filter Press shall be recycled to the water circuit. Process water is initially provided as free-flowing water through portal channel. Water from the channel is pumped into the circuit and as the water flows the circuit will be discharged back into the portal channel. Water in the portal channel is handled within the current permitted water management and no change is required. The proposed process does not alter the current portal flow process. Water quality data from the circuit has been tested in a closed loop bench study with the data reported in Section 5"Water Analysis".Actual process circuit diagram is available in Section 4"Process Flow Diagram". Section 3a Shut Off Capability: 4 1900 MAIN ST, UNIT 1 I PO BOX 1030 I OURAY CO 81427