Laserfiche WebLink
The Meadville Mill M 1990-057 <br /> EXHIBIT C—MILL PLAN <br /> Page 4-5 <br /> • RoM will first go through a trommel where fines will be washed and sent <br /> directly to the ball mill circuit. Coarse material will report to the crusher. <br /> • The trommel/crusher will operate 8-hours per day during day shift. This will <br /> also mitigate noise during nighttime hours. <br /> Trommel and crusher circuit equipment performance criteria are shown in Table 4-2. <br /> TABLE 4-2: TROMMEL& CRUSHER PERFORMANCE CRITERIA <br /> Equipment Performance Value Unit <br /> Trommel <br /> Operating Time 8 hr/day <br /> 54.3 dstph <br /> Residue Time 5 min <br /> Pulp Density 30% - <br /> Primary Crusher <br /> Feed 27.2 stph <br /> F80 50 mm <br /> P80 18 mm <br /> Screen Aperture 18 mm <br /> Secondary Crusher <br /> Feed 13.6 stph <br /> F80 18 mm <br /> P80 12.5 mm <br /> GRINDING CIRCUIT <br /> Since the trommel/crusher will only operate 8-hrs/day, an operating philosophy was <br /> developed for steady state plant operation. This results in the ball mill processing <br /> 13.58stph fines and 5stph coarse material during the 8-hours of trommel/crusher <br /> operation and 11.95stph coarse material only during the remaining 16 operating <br /> hours. <br /> The thickener will stabilize the operation, providing a steady 20stph feed to the leach <br /> circuit. <br /> Trommel and crusher circuit equipment performance criteria are shown in Table 4-3. <br />