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L <br />t <br /> <br /> <br />L <br />1 <br />in 16 segments with a month of neautralization efforts per segment. <br />Cyanide concentrations in the heap will be significantly less than <br />concentrations in the working pond solutions. based on the water <br />balance calculations presented in Appendix G, approximately 3 pond <br />volumes will be used in continuous rinsing of the heap. For costs <br />calculations an average concentration of 50 ppm free cyanide was <br />assumed for the first rinsing, 10 ppm for the second rinsing and 2 <br />ppm for the third rinsing. <br />First Rinsing <br />50 ppm = 0.1 lbs/ton <br />0.1 lbs cyanide/ton water x 33,360 tons water = 3,336 lbs cyanide <br />' 3 x 3,336 lbs cyanide = 10,008 lbs hydrogen peroxide required <br />10,008 lbs hydrogen peroxide x 1 barrel/500 lbs x 1 barrel/50% <br />strength = 40 barrels <br />40 barrels/rinsing x 5240/barrel = 59,600 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br />Second Rinsing <br />10 ppm = 0.02 lbs/ton <br />0.02 lbs cyanide/ton water x 33,360 tons water = 667 lbs cyanide <br />3 x 667 lbs cyanide = 2,001 lbs hydrogen peroxide required <br />2,001 lbs hydrogen peroxide x 1 barrel/500 lbs x 1 barrel/50% <br />strength = 8 barrels <br />8 barrels/rinsing x 5240/barrel = $1,920 <br />Third Rinsing <br />2 ppm = .004 lbs/ton <br />0.004 lbs cyanide/ton water x 33,360 tons water = 134 lbs cyanide <br />134 lbs cyanide x 3 = 402 lbs hydrogen peroxide required <br />402 lbs hydrogen peroxide x 1 barrel/500 lbs x 1 barrel/50% <br />strength = 1.6 barrels, round to 2 barrels <br />2 barrels/rinsing x 5240/barrel = $480 <br />L-9 <br />(Revised 4/20/89) <br />(Revised 3/14/89) <br /> <br />