Annual Cost CE Tons Contr.$/ton Incr CE

#1 Cansolv 17,323,399 $ 0.985 20036 864.62 $ #2 Acid Plant 33,578,725 $ 0.96 19527 1,719.57 $ -31965.6 #3 Caustic Scrubber 16,643,002 $ 0.9 18307 909.11 $ 393.523On Secondary Hooding

Capital Cost 85,000,000 $ provided by ASARCO Annualized Cap Cost 8,023,399 $ Operating Cost 9,300,000 $ used high end of estiamte Total Annual Cost 17,323,399 $

SO2 Controlled 20036tpy based on 98.5% CE

Cost of control 864.62 $ dollars per tonOn Secondary Hooding

Capital Cost 28,000,000 $ provided by ASARCO Annualized Cap Cost 2,643,002 $ Operating Cost 14,000,000 $ used high end of estiamte Sludge Disposal 7,000,000 $ If toxic waste 21,000,000 $ Total Annual Cost 23,643,002 $

SO2 Controlled 18307tpy based on 95% CE

Cost of control 1,291.48 $ dollars per tonOn Secondary Hooding

Capital Cost 28,000,000 $ provided by ASARCO Annualized Cap Cost 2,643,002 $ Operating Cost 14,000,000 $ used high end of estiamte Sludge Disposal

- $ Assumes sludge mass is 5 times SO2 controlled plus acid plant PM, at $60/ton 14,000,000 $ Total Annual Cost 16,643,002 $

SO2 Controlled 18307tpy based on 95% CE

Cost of control 909.11 $ dollars per tonAssumes sludge mass is 5 times SO2 controlled plus acid plant PM, at $60/tonFor Secondary hood based on 2012 Test numbers

Q 311,287scfm @ 70 F (upsized 50%) % SO2 0.23145Second lowest value from 2012 secondary hood source test, converted from ppm to percentage

ln cost 2.541893588from 1984 OAQPS report of NSPS P, page 8-13 cost $12.70millions of 1981 dollars CPI Mult 2.57from Bureau of Labor Statistics CPI Calculator (http://www.bls.gov/data/inflation_calculator.htm) Multiplier 2.5to be somewhat conservative 163,242,593.67 $ 2013 dollars (doubled based on MECS estimate)

Annualized Cost 15,408,946.02 $ 2013 dollars Catalyst Cost 1,842,242.62 $ Cost of changeout every 2 years, 100% Cs catalyst in 1 and 4 Preheater energy cost 16,327,536.25 $ Doubled based on MECS letter requiring colling and reheating Annual Variable Cost 18,169,778.86 $ Total annual cost 33,578,724.88 $
Emissions Reduction (tons) 19527assumed reduction of 96% (provided by MECS) from highest two of past five years in secondary system

Cost of control 1,719.57 $ dollars per tonSecond lowest value from 2012 secondary hood source test, converted from ppm to percentage
from 1984 OAQPS report of NSPS P, page 8-13
from Bureau of Labor Statistics CPI Calculator (http://www.bls.gov/data/inflation_calculator.htm)
2013 dollars (doubled based on MECS estimate)

Cost of changeout every 2 years, 100% Cs catalyst in 1 and 4 Doubled based on MECS letter requiring colling and reheating

assumed reduction of 96% (provided by MECS) from highest two of past five years in secondary systemSO2 (tpy)

Acid Plant 2nd Hood Furnace vent Fugitives Anode 2011 541 18290 1127 563 36.6 2010 509 20476 1344 1223 38.0 2009 731 20206 1091 1074 33.3 2008 1174 17738 1014 1195 37.1 2007 894 16628 1024 1181 36.7 Baseline 1034 20341 1209 37.5
PM10 (tpy)

Acid Plant 2nd Hood Furnace vent Fugitives Anode 2011 30.6 46.5 12.7 9.9 64.1 2010 49.5 110.5 13.2 11.3 69.9 2009 26.0 29.2 11.6 9.9 62.2 2008 45.6 35.4 12.9 9.7 69.6 2007 27.3 85.4 12.8 9.0 64.0 Baseline 36 70 11 69.8Data from 2012 CEMS, Secondfary Hood, and Furnace Vent Test by EEMC

Secondary Hood Test Date 9/10/2012

Time SO2 ppmvd %H2O ADCFM T (F) SDCFM 09:23-09:43 3,066.1 3.22 214,478 131 192,341 09:55-10:16 2,108.5 4.32 233,759 137 207,525 10:35-10:56 2,629.3 3.06 230,391 162 196,314 11:13-11:34 5,309.8 4.52 228,332 169 192,394 11:47-12:08 2,966.2 3.28 233,163 192 189,534 12:20-12:41 5,208.0 3.78 225,362 193 182,912 13:01-13:22 2,754.6 3.25 228,867 203 182,956 13:38-13:59 2,708.5 3.07 228,577 196 184,673 14:08-14:29 2,314.5 2.56 226,900 192 184,443 14:42-15:03 5,779.8 4.08 250,330 196 202,248

Max 5,779.8 4.52 250,330 203 207,525 Average 3,484.5 3.51 230,016 177 191,534 Min 2,108.5 2.56 214,478 131 182,912 Design Value 2,314.5 3.51 250,330 177.10 207,525

Acid Plant Test Date 9/13/2012

Time SO2 ppmvd %H2O ADCFM T (F) SDCFM 07:52-08:22 58.9 0.64 111711 309 76,992 08:38-09:08 52.5 2.16 152872 303 106,189 09:16-09:46 67.1 1.08 174800 300 121,900 10:01-10:31 61.5 0.61 159667 302 111,054 10:40:11:10 144.3<0.5 158662 309 109,351 11:20-11:50 189.8<0.5 168804 320 114,700 12:00-12:30 186.3 0.61 161851 338 107,495 12:41-13:11 106.9<0.5 153669 350 100,549 13:21-13:51 256.6<0.5 186298 349 122,049 14:01-14:31 150.7<0.5 182830 360 118,171

Max 256.6 2.16 186,298 360 122,049 Average 127.5 1.02 161,116 324 108,845 Min 52.5 0.61 111,711 300 76,992Catalyst Volume Cost K-Cat Cs-Cat
Existing Acid Plant Cost (standard Cat) Pass Loading (L) Capacity (L) Loading (L) Capacity (L)

1 70,700 105,980 $289,870.00 $434,518.00 2 84,900 120,180 $348,090.00 $492,738.00 3 84,900 120,180 $348,090.00 $492,738.00 4 113,200 148,480 $464,120.00 $608,768.00 $1,450,170.00 $2,028,762.00 Annual Cost $725,085.00 delta

New Acid Plant Volume mult. 1.76scfm secondary/scfm primary Cost (standard Cat) Pass Loading (L) Capacity (L) Loading (L) Capacity (L)

1 124,410 186,493 $510,082.88 $764,619.29 2 149,398 211,480 $612,532.34 $867,068.75 3 149,398 211,480 $612,532.34 $867,068.75 4 199,198 261,280 $816,709.79 $1,071,246.19 $2,551,857.35 $3,570,002.97 Annual Cost $1,275,928.67from 2011 Sales Proposal

$4.10per liter $7.60per liter
Cost (Cs-Cat in 1 and 4) Loading (L) Capacity (L) $537,320.00 $805,448.00 $348,090.00 $492,738.00 $348,090.00 $492,738.00 $860,320.00 $1,128,448.00 $2,093,820.00 $2,919,372.00 $1,046,910.00 $321,825.00

Cost (Cs-Cat in 1 and 4) Loading (L) Capacity (L) $945,519.48 $1,417,343.07 $612,532.34 $867,068.75 $612,532.34 $867,068.75 $1,513,901.07 $1,985,724.65 $3,684,485.23 $5,137,205.21 $1,842,242.62Specific Heat of Air 1J/(g-K)

Specific Heat of Air 0.2388Btu/(lb-R) Desity air @ 70F 0.07429lb/ft^3 avg Flow in secondary 191,534scfm avg mass flow in secondary 14229.07lb/min avg Temp in secondary 177.10F Temp needed in catalyst 735F delta T 558F or R Energy finput required 113.78MMBtu/hr Assuming 80% heat transfer eff. 142.23MMBtu/hr @ 80% efficiency heat conversion Energy content of natural gas 1050MMBtu/MMscf Natural gas needed per hour 0.135MMscf/hr Potential annual natural gas requirement 1186.59MMscf/yr Cost of natural gas $6.88 per 1000 scf Hourly natural gas cost $931.94 potential annual natural gas cost $8,163,768.12

Nox emission factor 50lb/MMscf Potential Annual NOx emissions 29.66tpyMMBtu/hr @ 80% efficiency heat conversion0.000948Btu/J

453.59g/lb 0.555556K/Rinterest rate 0.07

n 20years CRF 0.094393