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The Leadville Mill M 1990-057 <br /> EXHIBIT C—MILL PLAN <br /> Page 4-14 <br /> Ore will be geochemically characterized, and ore metal values will be evaluated prior <br /> to processing. Ore seller information and the characteristics of the ore as outlined in <br /> Section 4.6 will be determined prior to receiving or processing ore. <br /> The plant is anticipated to operate at a rate of 8tph ore throughput using 3-8 hour <br /> shifts per day for a 20-shift cycle with the 21st shift reserved for maintenance. W+4 <br /> additional dewntime and epeFatienal delays,the mill will epeFate at 160tpd OF 5614PY, <br /> 4.2.6 DUST CONTROL <br /> Dust control within the Mill buildings will be accomplished utilizing a 4,000cfm UAS <br /> Dust Hawg horizontal cartridge dust collector. Dust will be managed in the crushing <br /> plant by use of a ducted exhaust air system which will draw air and dust down through <br /> the crusher and transfer points. Pollutants from the screening, primary and secondary <br /> crushing circuits, conveyance systems, and fine ore storage operations will be limited <br /> to fugitive particulate matter. Negative pressure ventilation will direct venting to the <br /> dust collector to control the flow of fugitive particulate matter during screening and <br /> crushing operations. <br /> The unit is estimated to operate at air velocities of 3,500-4,500fpm based on demand <br /> and manual control dampers at each collection point. The dust collector is rated at <br /> 4,000cfm and upgradable to 6,000cfm. The dust control unit is designed to capture <br /> 28.2tpy crushed ore fugitive particulate matter and an additional 0.4tpy reagent <br /> fugitive particulate matter for a combined 165lb/day at a 99.8% at 0.5µm published <br /> design efficiency. The captured dust will be pulse-cleaned off the filters in the dirty air <br /> plenum and collected in drums and returned to the material flow in the grinding circuit. <br />