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<br /> <br /> <br />Estimation of fugitive dust from the ore piles adjacent to the ore :porter. <br />Referring to the equations given in Figure 3.2-4 by the Colorado <br />APCD, 1977, for load-in, load-out, stockpile maintenance and <br />stockpile wind erosion, the silt content term is zero due to the <br />fact that all ore is washed after crushing and before being <br />sorted. Therefore, the emission factor equation goes to zero. <br />Estimation of fugitive dust from the haul road due to ore haulage to ore <br />shipping pad. <br />A. Assumptions: <br />1. Gravel road silt content: l00 <br />2. Average vehicle speed: 10 m.p.h. <br />3. Average vehicle weight: 25 tons <br />4. Number of dry days per year: 215 days <br />EF = 5.9 S S W 0.8 d lb. x <br />12 30 3 365 VMT (0.5) (Colo. APCD, 1977) <br />_ (5.9) (0.83) (0.333) (5.5) (0.75) lb/VMT x (0.5) <br />• = 3.3 lb/VMT <br />Annual average haulage = 3430 tons x tri x 12 months <br />Month 18 tons yr. <br />x 7.6 Miles <br />trip <br />= 17380 vehicle miles travelled (VMT) <br />Yr. <br />Q = 3.3 lb/UMT x (17380 VMT) <br />Yr. <br />= 28.7 tons - non-ore bearing particulate <br />yr. <br />• <br />3-5 <br />