1980-07-11_REVISION - M1977493 (8)

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Table 7. 3-2 provides the habitat acreages that will be displaced by mining operations within each of the experienced periodic and prolonged pertubations due to historical- mining activities and their associated mining town activities extending back to the late 1800 ' s Such pertubations and their residual effects and recent human activities in the area have prohibited, discouraged and altered wildlife utilization. It is probable that present levels of human activity and noise will prevail during the planned life of the mine and discourage full utili- zation of periphery lands by big game . Small mammals and bird populations, particularly those of non-game species , do not appear to be adversely affected relative to adjacent habitat. As vegetation becomes established by the final years of the mining and reclamation operations, the affected acreages will naturally provide alternate habitat types for small mammals, birds and other smaller animals. 7.4 AIR Air Emissions The primary contaminate in the air stream of plant ventilation systems is dust. Ventilation systems which carry a dust load requiring control are equipped with wet-type scrubbers. Of the wet-type scrubbers, the water-bath type N&W Roto-Clone and the centrifugal type UW-4 Ducon are prevalent. Another contaminate collected by a plant ventilation system is cement dust at the surface Batch Plant. In this case a baghouse dry collector is in use to provide an efficient and reliable means of dust removal . During normal operations , the concentrate is dried in an indirect drier (Holo-Flite) with emissions control provided by a Ducon wet centrifugal scrubber . A multi-hearth drier is available for standby service and emissions" control include the sequence of a Ducon dry cyclone , a Ducon wet centrifugal scrubber, a HEAF (High Energy Air Filter with fiber-glass media) , an oil mist stilling chamber and mist eliminator. 7-9