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Closure criteria
<br />Arequa Gulch VLF - Chemical Closure and Reclamation Costs
<br />AGVLF Rinsing and Chemical Closure Cost Estimate
<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 gaVcu.ft.) = 18,420,000,000 gallons.
<br />ana rwo waver rinses mcwaea in cosrs
<br />18- ArequaVLF
<br />Avg. circulation during rinse = 28,000 gpm
<br />Revised by MDE (12512) Lined up the headings; corrected cell refs;
<br />MDE (3 -7 -14) Increased peroxide cost; included inflation.
<br />Time to complete
<br />each rinse (18,420,000,000 gallons/ 28,000 gpm) = 457 days say 15.2 months
<br />CPI for 2009
<br />214.
<br />CPI for 2013
<br />232.96
<br />ited cost items
<br />Ratio=
<br />1.065859316
<br />Eauiomt
<br />Labor
<br />Materials
<br />Total
<br />15.2 48000
<br />$
<br />729,600 Materials
<br />Purchase make up water (assume 900 avg gpm for 15.2 months)@$48,000 /month
<br />$
<br />729,600 $
<br />729,600
<br />9 457
<br />300 $
<br />1,233,900 Labor
<br />Nine operator shifts 24 hours X 457 daysX$300 per shift
<br />$
<br />1,233,900
<br />$
<br />1,233,900
<br />2 457
<br />320 $
<br />292,480 Labor
<br />Two mechanics shifts/24 hours X 457 days X $320 pr shift
<br />$
<br />292,480 $
<br />6,135,571 $
<br />6,428,051
<br />15.2 403656
<br />$
<br />6,135,571 Malls = Power
<br />Pumping costs (power) current costs $403656/mo X 15.2 months
<br />$
<br />-
<br />15.2 15000
<br />$
<br />228,000 Equipment
<br />Pump maintenance and replacement per 15.2 months ($15,000 /mo)
<br />$ 228,000
<br />$
<br />228,000
<br />15.2 750
<br />$
<br />11,400 Equipment
<br />Backup generator maintenance per 15.2 months ($750 /mo)
<br />$ 11,400
<br />$
<br />11,400
<br />3 600
<br />15.2 $
<br />27,360 Equipment
<br />3 Support vehicles X $600 /mo X 15.2 months
<br />$ 27,360
<br />$
<br />304,800 $
<br />332,160
<br />1.27 240000
<br />$
<br />304,800 Materials
<br />Drip irrigation supplies cost $240,o00/yr X 1.27 yrs.
<br />$
<br />8,963,111
<br />Estimate per each pore volume rinse
<br />$
<br />-
<br />Subtotals = $ 266,760 $
<br />1,526,380 $
<br />7,169,971 $
<br />8,963,111
<br />$17,926,222
<br />Estimate for two pore volume rinses Rinse 2 Pore Volumes =
<br />$ 633,520$
<br />3,052,760 $
<br />14,338,842 $
<br />17,926,222
<br />Revised 20141nflated Cost for Rinsing =
<br />S 678,328 $
<br />3,314,868 $
<br />15,571,160 $
<br />18,465,356
<br />check $
<br />19,465,356
<br />inse, Evap. Peroxide Treatment
<br />Flow rate starts at 28,000
<br />gpm and ends at 0 gpm, no fresh water makeup,
<br />H2O2 additions during initial phase, followed by straight evaporation last 15 months, spray
<br />irrigation practices employed
<br />Time to complete rinse and treatments (18,420,000,000 gallons / 14,000 gpm average flow = 914 days say 30.5 months
<br />lted Cost Items
<br />Revised by MDE (12 -5 -12) Lined up the
<br />headings
<br />MDE (3 -7 -14) Increased peroxide cost; included inflation.
<br />Eauiomt
<br />Labor
<br />Materials
<br />Tote
<br />9 457 $
<br />300.00 $
<br />1,233,900 Labor
<br />Nine operators shifts / 24 hours X 457 days X $300 per shift (during peroxide additions)
<br />$
<br />1,233,900
<br />$
<br />1,233,900
<br />6 457 $
<br />320.00 $
<br />877,440 Labor
<br />Six mechanic shifts / 24 hours X 457 days X $320 per shift (during peroxide additions)
<br />$
<br />877,440
<br />$
<br />877,440
<br />3 457 $
<br />300.00 $
<br />411,300 Labor
<br />Three operator shifts/ 24 hours X 457 days X $300 per shift (during biological treatments)
<br />$
<br />411,300
<br />$
<br />411,300
<br />1 457 $
<br />320.00 $
<br />146,240 Labor
<br />One mechanic shift 24 hours X 457 days X $320 per shift (during biological treatments)
<br />$
<br />146,240 $
<br />6,161,000 $
<br />6,307,240
<br />30.5 202000
<br />$
<br />6,161,000 Matls = Power
<br />Pumping costs (power) 14,000 average gpm @ $202,000 /month for 30.5 months
<br />$
<br />-
<br />30.5 15000
<br />$
<br />457,500 Equipment
<br />Pump maintenance and replacement for 30.5 months ($15,000 /mo)
<br />$ 457,500
<br />$
<br />457,500
<br />30.5 750
<br />$
<br />22,875 Equipment
<br />Backup generator maintenance for 30.5 months ($750 /mo)
<br />$ 22,875
<br />$
<br />600,000 $
<br />622,875
<br />$
<br />600,000 Materials
<br />Spray irrigation system maintenance and parts (lump sum from GWG)
<br />$
<br />1,013,600 $
<br />1,013,600
<br />362000 $ 2.80 per
<br />gallon $
<br />1,013,600 Materials
<br />H2O2 costs (see attached memos) $2.80 / gal
<br />$
<br />10,923,855
<br />Subtotals =
<br />$ 480,375 $
<br />2,668,880 $
<br />7,774,6001
<br />W 10rA
<br />o Materials Sheet Tab 9
<br />$
<br />10,923,855
<br />Estimate for H2O= pore volume rinse over 30.5 months
<br />Escalation factor S
<br />11,861,770
<br />Revised 2014 Rinse 3, Evap and Peroxide Treatment =
<br />$ 521,620 $
<br />2,688,028 i
<br />8,442,121.84 S
<br />11,861,770
<br />CPI for 2009 214.54
<br />1.085859316 Escalation Factor
<br />CPI for 2013 232.
<br />11,861,770
<br />Estimate for H2O2 pore volume rinse over 30.5 months
<br />Total Eauiomt
<br />Total Labor
<br />Total Materials
<br />Grand Total
<br />Ratio = 1.085859
<br />Its
<br />29.787 997
<br />Revised 2014 Estimate for Total AGVLF Detoxification and Rinsinq =
<br />$ 1,100,947 $ 6,212,896 $
<br />24,013,282 $
<br />31,327,125
<br />3/21/2014
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