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• Recalculation of the VLF Rinsins>I and Chemit~psure Cost Estimate •
<br />Closure criteria
<br />Based upon Golder/Smith Williams design the completed 412 million ton pad (Phases 1-5) will result in 285.2 million cy of ore
<br />At average density of 110 pounds per cu.ft. the average porosity is 32%
<br />Total volume of voids (285.2 X 0.32) = 91.2 million cu. yds in one pore volume.
<br />Total gallons required per one pore volume rinse (91.2 million cu.yds.X 27 cu. ft./cu. yd X 7.48 gaUcu.ft.) =18,420,000,000 gallons.
<br />Detail for calculating First and Second Rinse Costs
<br />Avg. circulation during rinse = 28,000 gpm
<br />Time to complete each rinse (18,420,000,000 gallons/ 28,000 gpm) = 457 days sav 15.2 months
<br />Associated cost items
<br /> Eaui°mt Labor tdatertals
<br />15.2 48000 $729,600 Purchase make up water (assume 900 avg gpm for 15.2 months)(a)$48,000/month $729,600 $
<br />9 457 300 $1,233,900 Nine operator shifts /24 hours X 457 daysX$300 per shill $1,233,900 $
<br />2 457 320 $292,480 Two mechanics shiftsl24 hours X 457 days X $320 pr shift $2s2,a6o $
<br />15.2 403656 $6,135,571 Pumping costs (power) current costs $403656/mo X 15.2 months $6,135,571 $
<br />15.2 15000 $228,000 Pump maintenance and replacement per 15.2 months ($15,000/mo) $228,000 $
<br />15.2 750 $11,400 Backup generator maintenance per 15.2 months ($750/mo) St t,aoo $
<br />3 600 15.2 $27,360 3 Support vehiGes X $B00/mo X 15.2 months $27,360 $
<br />1.27 240000 $304,800 Drip irrigation supplies cost $240,000tyr X 1.27 yrs. 530a,60o $
<br />$8,963,111 Estimate per each pore volume rinse $
<br />Subtotals = $ 266,760 $ 1,526,380 $ 7,169,971 $
<br />$17,926,222 Estimate for two sore volume rinses Two Pore Volumes = s 533,szo s 3,os2,7so f 14,33s,>a~
<br />""~
<br /> Check = $ 17,926,222 ~~~
<br />Third Rinse. Evag. Peroxide Treatment
<br />Flow rate starts at 28,000 gpm and ends at 0 gpm, no fresh water makeup, H2O2 additions during initial phase, followed by sVaight evaporation last 15 months, spray irrigation
<br />practices employed
<br />Time to complete rinse and treatments (18,420,000,000 gallons / 14,000 gpm average flow = 914 days sav 30.5 months
<br />Associated Cost Items
<br />9 457 300 $1,233,900 Nine operators shifts ! 24 hours X 457 days X $300 per shift (during peroxide additions)
<br />6 457 320 $877,440 Six mechanic shifts / 24 hours X 457 days X $320 per shift (during peroxide additions)
<br />3 457 300 $411,300 Three operator shahs/ 24 hours X 457 days X $300 per shift (during bioogicel treatments)
<br />1 457 320 $146,240 One mechanic shift /24 hours X 457 days X $320 per shift (during biological Vestments)
<br />30.5 202000 $6,161,000 Pumping costs (power) 14,000 average gpm Q $202,000/month for 30.5 months
<br />30.5 15000 $457,500 Pump maintenance and replacement for 30.5 months ($15,o001mo)
<br />30.5 750 $22,875 Backup generator maintenance for 30.5 months ($750/mo)
<br /> $600,000 Spray IMgation system maintenance and parts (lump sum from GWG)
<br />362000 2.49 $901,380 H2OZ costs (see attached memos) $2.49 gal X 382,000 galbns
<br />$10,811,635 Estimate for H=Or pore volume rinse_over 30.5 months
<br />Total of 5 years to complete
<br />$28 737,857 Estimate for Total VLF Detoziflcation and Rinsing
<br />Eouioml Labor Materials
<br /> $1,233,900 $
<br /> 5877,440 $
<br /> $411,300 $
<br /> $146,240 $
<br /> $6,161,000 $
<br />$457,500 $
<br />$22,975 $
<br /> $600,000 $
<br /> $901,380 $
<br />$ 480,375 $ 2,668,880 $ 7,662,380 $
<br />Check $ 10,811,635
<br />Total
<br />729,600
<br />1,233,900
<br />292,480
<br />6,135,571
<br />228,000
<br />11,aoo
<br />27,360
<br />3oa,6oo
<br />8,963,111
<br />17,92622
<br />Total
<br />1,233,900
<br />877,440
<br />411,300
<br />146,240
<br />6,161,000
<br />457,500
<br />22,875
<br />600,000
<br />901,380
<br />10,811,635
<br />E°ui°mt Labor ~A,iteriais T I
<br />-D f 1,013,895 f 5,721,840 f 22,002,322 f 28,737,857
<br />Prepared by Goodrtch, Lupo, and Campbell (2-4-08)
<br />Equipment, labor, Materials Breakdown by Ellis (3-2-08)
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