Tilden Mining Company

Table 1: Facility-wide Potential to Emit Calculations for NOx and SO2 (DRAFT)

SV EU EU_Desc Tput_Hr Tput_Hr_Note Tput_Ann Tput_Ann_Note Units Pollutant Unc lbs/hr Unc tons/yr PTE lbs/hr PTE tons/yr

SVP0051711 EU0064 EU-KILN1 (firing coal) 600 [101] 5,256,000 [103] LT pellets NOx 1.016 [104] 610 [112] 2,670.0 [114] [115] 610 [118] 2,670 [119]

SVP0051981 NA [101] 365 days/year SO2 28,800 [105] NA [111] 5,256.0 [113] [115] NA [118] 5,256 [119]

EU-KILN1 (firing natural gas) 600 [101] 5,256,000 [103] LT pellets NOx 4.4 [106] 2,640 [112] 11,563.2 [114] [115] 2,640 [118] 11,563 [119]

NA [101] 365 days/year SO2 28,800 [105] NA [111] 5,256.0 [113] [115] NA [118] 5,256 [119]

SVP0052131 EU0087 EU-KILN2 (firing coal) 600 [101] 5,256,000 [103] LT pellets NOx 1.016 [104] 610 [112] 2,670.0 [114] [115] 610 [118] 2,670 [119]

SVP0052431 EU0087 NA [101] 365 days/year SO2 28,800 [105] NA [111] 5,256.0 [113] [115] NA [118] 5,256 [119]

EU-KILN2 (firing natural gas) 600 [101] 5,256,000 [103] LT pellets NOx 4.4 [106] 2,640 [112] 11,563.2 [114] [115] 2,640 [118] 11,563 [119]

NA [101] 365 days/year SO2 28,800 [105] NA [111] 5,256.0 [113] [115] NA [118] 5,256 [119]

SVP0082951 EU0071 EU-OREDRYER1 (firing used oil) 0.47 [102] 4,088 [103] 1000 gallons NOx 55 [120] 25.7 [112] 112.4 [114] [115] 25.7 [118] 112.4 [119]

SVP0082951 EU0071 0.47 4,088 1000 gallons SO2 237.9 [120] 111.0 [112] 486.3 [114] [115] 111.0 [118] 486.27 [119]

SVP0082951 EU0071 EU-OREDRYER1 (firing natural gas) 0.069 [102] 601 [103] MM cf NOx 140 [120] 9.6 [112] 42.1 [114] [115] 9.6 [118] 42.1 [119]

SVP0082951 EU0071 0.069 601 MM cf SO2 0.6 [120] 0.04 [112] 0.2 [114] [115] 0.0 [118] 0.2 [119]

SVP0082851 EU0073 EU-OREDRYER2 (firing used oil) 0.83 [102] 7,300 [103] 1000 gallons NOx 55 [120] 45.8 [112] 200.8 [114] [115] 45.8 [118] 200.8 [119]

SVP0082861 EU0073 EU-OREDRYER2 (firing used oil) 0.83 7,300 1000 gallons SO2 237.9 [120] 198.3 [112] 868.3 [114] [115] 198.3 [118] 868.3 [119]

EU0073 EU-OREDRYER2 (firing natural gas) 0.123 [102] 1,074 [103] MM cf NOx 140 [120] 17.2 [112] 75.1 [114] [115] 17.2 [118] 75.1 [119]

EU0073 EU-OREDRYER2 (firing natural gas) 0.123 1,074 MM cf SO2 0.6 [120] 0.07 [112] 0.3 [114] [115] 0.1 [118] 0.3 [119]

SVBLR.STK.T1 EU0062 EU-BOILER1 (firing used oil) 1.5 [102] 13,140 [103] 1000 gallons NOx 47 [107] 70.5 [112] 308.8 [114] [115] 70.5 [118] 308.8 [119]

SVBLR.STK.T1 EU0062 EU-BOILER1 (firing used oil) 1.5000 13,140 1000 gallons SO2 235.5 [107] 353.3 [112] 1,547.2 [114] [115] 353.3 [118] 1,547.2 [119]

EU0062 EU-BOILER1 (firing natural gas) 0.221 [102] 1,932 [103] MM cf NOx 190 [116] 41.9 [112] 183.6 [114] [115] 41.9 [118] 183.6 [119]

EU0062 EU-BOILER1 (firing natural gas) 0.2206 1,932 MM cf SO2 0.6 [110] 0.13 [112] 0.6 [114] [115] 0.1 [118] 0.6 [119]

SVBLR.STK.T1 EU0063 EU-BOILER2 (firing used oil) 1.50 [102] 13,140 [103] 1000 gallons NOx 47 [107] 70.5 [112] 308.8 [114] [115] 70.5 [118] 308.8 [119]

SVBLR.STK.T1 EU0063 EU-BOILER2 (firing used oil) 1.50 [102] 13,140 [103] 1000 gallons SO2 213.0 [107] 319.5 [112] 1,399.4 [114] [115] 319.5 [118] 1,399.4 [119]

EU0062 EU-BOILER2 (firing natural gas) 0.221 [102] 1,932 [103] MM cf NOx 190 [116] 41.9 [112] 183.6 [114] [115] 41.9 [118] 183.6 [119]

EU0062 EU-BOILER1 (firing natural gas) 0.221 [102] 1,932 [103] MM cf SO2 0.6 [110] 0.13 [112] 0.6 [114] [115] 0.1 [118] 0.6 [119]

SVBLR.STK.T2 EU0072 EU-BOILER3 (firing used oil) 1.600 [102] 14,016 [103] 1000 gallons NOx 47 [107] 75.2 [112] 329.4 [114] [115] 75.2 [118] 329.4 [119]

SVBLR.STK.T1 EU0062 EU-BOILER1 (firing used oil) 1.600 14,016 [103] 1000 gallons SO2 235.5 [107] 376.8 [112] 1,650.4 [114] [115] 376.8 [118] 1,650.4 [119]

EU0062 EU-BOILER3 (firing natural gas) 0.235 [102] 2,061 [103] MM cf NOx 190 [116] 44.7 [112] 195.8 [114] [115] 44.7 [118] 195.8 [119]

EU0062 EU-BOILER1 (firing natural gas) 0.235 [102] 2,061 [103] MM cf SO2 0.6 [110] 0.1 [112] 0.6 [114] [115] 0.1 [118] 0.6 [119]

Total NOx: 1,477.3 6,470.6 1,477.3 6,470.6

Total SO2: 1,049.7 15,109.6 1,049.7 15,109.6

Notes:

[101] Maximum hourly throughput = Design capacity of emission unit:

Kiln 1 Indurating Furnace 600 LT pellets/hr 590 MM Btu/hr

Kiln 2 Indurating Furnace 600 LT pellets/hr 590 MM Btu/hr

Note that although Kilns 1 and 2 can also fire used oil, the highest NOx emissions are from natural gas and coal respectively so calculations on used oil are not provided.

[102] Maximum hourly throughput = Design Heat input of emission unit (MM Btu/hr), converted to fuel units (1000 gallons/hr or MM cf/hr) using the following heat contents: 

Used oil (assumed residual oil) 150 MM Btu/1000 gals (from AP-42, May 2010, Table 1.3-2 footnote d)

Natural gas 1,020 MM Btu/MM cf (from AP-42, July 1998, Table 1.4-1 footnote a)

70 MM Btu/hr heat input (EU-OREDRYER1)

125 MM Btu/hr heat input (EU-OREDRYER2)

225 MM Btu/hr heat input (EU-BOILERS1-2) Each

240 MM Btu/hr heat input (EU-BOILER3)

[103] Maximum annual throughput = Maximum hourly throughput x 8,760 hrs/yr.

[104] Emission factor based upon stack test data from May 2004. 

[105] Permit limit specified in ROP MI-ROP-B4885-2008a, issued 8/19/2010, pages and 33. 

[106] Emission factor based upon stack test data from January 2012, which is 2270 lb NOx/hr at 515 LT/hr equals 4.4 lb NOx/LT.

[107] AP-42, May 2010, Table 1.3-1 for Boilers firing #6 residual oil, normal firing. Sulfur content of fuel is assumed to be no greater than 1.50 wt.% based upon ROP limitation for used oil.

Note that AP-42, May 2010, Table 1.3-1 for Boilers >100 MM Btu/hr has slightly lower factor for NOx than boilers < 100 MM Btu/hr but the same factor is conservatively used for both Ore Dryers.

[108] AP-42, July 1998, Table 1.4-1 for Small Boilers < 100 MM Btu/hr uncontrolled

[109] AP-42, July 1998, Table 1.4-1 for Large Wall-fired boilers > 100 MM Btu/hr, uncontrolled (Pre-NSPS).

[110] AP-42, July 1998, Table 1.4-2.

[111] NA - The permit limit in the ROP provides a limit of 28,800 pounds per day. 

[112] Maximum Uncontrolled Emissions (lbs/hr) = Maximum Hourly Throughput (units/hr) x Uncontrolled Emission Factor (lbs/unit).

Control Efficiency

(lbs/hr) (tons/yr)

Stack ID Emission Unit Throughput Pollutant Emission Factor Maximum Uncontrolled Emissions

(Units/hr) (Units/yr)

AQD 

Emission 

Unit ID

Description Maximum Units

Maximum Controlled Emissions

(lbs/Unit) (%) (lbs/hr) (tons/yr)

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Tilden Mining Company

Table 1: Facility-wide Potential to Emit Calculations for NOx and SO2 (DRAFT)

SV EU EU_Desc Tput_Hr Tput_Hr_Note Tput_Ann Tput_Ann_Note Units Pollutant Unc lbs/hr Unc tons/yr PTE lbs/hr PTE tons/yr

Control Efficiency

(lbs/hr) (tons/yr)

Stack ID Emission Unit Throughput Pollutant Emission Factor Maximum Uncontrolled Emissions

(Units/hr) (Units/yr)

AQD 

Emission 

Unit ID

Description Maximum Units

Maximum Controlled Emissions

(lbs/Unit) (%) (lbs/hr) (tons/yr)

[113] Maximum Uncontrolled Emissions (tons/yr) = Daily Emissions (lb/day) x 365 days/year / 2,000 (lbs/ton)

[114] Maximum Uncontrolled Emissions (tons/yr) = Maximum Annual Throughput (units/yr) x Uncontrolled Emission Factor (lbs/unit) / 2,000 (lbs/ton).

[115] No Air Pollution Control Devices (APCDs) are used in this process for these pollutants. 

[116] AP-42, July 1998, Table 1.4-1 for Large Wall-fired boilers > 100 MM Btu/hr, uncontrolled (Post -NSPS).

[117] Maximum Controlled Emissions (lbs/hr) = Maximum Hourly Throughput (units/hr) x Controlled Emission Factor (lbs/unit).

[118] Maximum Controlled Emissions (lbs/hr) = Maximum Uncontrolled Emissions (lbs/hr) x ((100-Control Eff.)/100).

[119] Maximum Controlled Emissions (tons/yr) = Maximum Uncontrolled Emissions (tons/yr) x ((100-Control Eff.)/100).

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