Tablke 1: Measured Flux Rates

Category Cat. HCN Flux (ug/m2-min)

Description ID CTZ GQ RM Average Description

Ponds/Channels CC 0.62 4 0.62 Channel Pregnant Covered

CO 25.38 2 28.88 4 5.08 5 19.78 Open Preg Channel, Tank, or Pond

BP 222.96 6 1155.65 5 712.57 7 697.06 Open Barren Ponds and Solution

Tails TA 42.62 6 15.39 4 0.96 4 19.66 Tails, Aqueous Surface

TW 6.46 5 5.50 4 1.80 10 4.59 Tails, Wet Sediment

TD 1.55 2 2.50 2 0.35 1 1.47 Tails, Dry Sediment

Active Pads PSW 21.92 13 48.64 20 43.25 25 37.94 Active Pad, Wet Surface

Psprink 72.98 2 265.85 3 169.41 Active Pad, Sprinkler, Wet Surface

PD 2.45 3 7.05 5 4.68 7 4.73 Active Pad, Dry Surface

Inactive Pads PI 0.78 16 1.95 Inactive Pad

PI1 2.22 3 Inactive Pad 1 mo

PI3 4.52 4 Inactive Pad 3 mo

PI12 0.41 2 1.82 3 Inactive Pad 12 mo

Tanks TK 574.50 8 212.12 12 847.97 6 544.87 Tanks

Ice/Snow Psn 0.92 5 1.74 2 1.33 Pad, Snow Covered

Tsn 0.80 2 0.54 1 0.67 Tails, Snow Covered

Bice 7.69 1 7.69 Barren Solution, Frozen

TAice 0.62 1 2.53 4 1.57 Tails, Aqueous, Frozen

Table 2: Measured Mass Tansfer Coefficients

Category Cat. kG (m/s)

Description ID CTZ GQ RM Average Description

Ponds/Channels CC 5.33E-07 4 5.33E-07 Channel Pregnant Covered

CO 4.35E-06 2 1.94E-04 4 5.17E-06 5 6.78E-05 Open Preg Channel, Tank, or Pond

BP 3.91E-05 6 1.70E-04 5 9.70E-05 7 1.02E-04 Open Barren Ponds and Solution

Tails TA 6.35E-05 6 2.43E-05 4 1.26E-06 4 2.97E-05 Tails, Aqueous Surface

TW 9.62E-06 5 1.13E-05 3 1.04E-05 Tails, Wet Sediment

TD 2.29E-06 2 2.29E-06 Tails, Dry Sediment

Active Pads PSW 7.11E-06 13 7.34E-06 20 3.06E-06 25 5.84E-06 Active Pad, Wet Surface

Psprink 2.70E-05 2 4.37E-05 3 3.53E-05 Active Pad, Sprinkler, Wet Surface

PD 7.05E-07 3 2.48E-06 1 6.61E-07 5 1.28E-06 Active Pad, Dry Surface

Inactive Pads PI Inactive Pad

PI1 Inactive Pad 1 mo

PI3 Inactive Pad 3 mo

PI12 Inactive Pad 12 mo

Tanks TK 2.27E-04 4 3.64E-04 12 1.29E-04 6 2.40E-04 Tanks

Ice/Snow Psn 2.02E-07 2 1.17E-07 1 1.60E-07 Pad, Snow Covered

Tsn Tails, Snow Covered

Bice 1.40E-06 1 1.40E-06 Barren Solution, Frozen

TAice 9.17E-07 1 9.17E-07 Tails, Aqueous, Frozen

D R A F T 
ROUND MOUNTAIN HCN EMISSIONS 66 days w/ 0.5+ in. 18% snow Wind: 

2008 Surface Area and 2008 Solution Data 

Snow Cover Solution Parameters 

Adjustment Free CN- T kG o

Area Source Cat. Category Description Acres Acres pH g/m3 C pKa a0 H m/s o

South Ded Pad South Ded Pad PSW Active Pad, Wet Surface 2.28 1.87 snow 11.31 116.07 10.84 9.618 0.0199 0.00326 3.0

PD Active Pad, Dry Surface 85.30 69.87 snow 7.8PI3 Inactive Pad 3 mo 0.00 0.00 snow 7.5

South Ded Pad Channels CO Open Preg Channel, Tank, or Pond 0.35 0.35 11.56 62.17 10.84 9.618 0.0114 0.00326 5.1

CC Channel Pregnant Covered 0.09 0.09 11.56 62.17 10.84 9.618 0.0114 0.00326 5.3

South Ded Pad Side Slopes-drips PSW Active Pad, Wet Surface 0.00 0.00 snow 11.31 116.07 10.84 9.618 0.0199 0.00326 3.0

PD Active Pad, Dry Surface 0.00 0.00 snow 7.8PI12 Inactive Pad 12 mo 81.56 66.81 snow 3.0

South Ded Pad Pond CO Open Preg Channel, Tank, or Pond 0.001 0.001 11.56 62.17 10.84 9.618 0.0114 0.00326 5.1

Active Surface Subtotal 88.01

West Ded Pad West Ded Pad Phases 1-5 PSW Active Pad, Wet Surface 3.10 2.54 snow 10.29 111.67 10.84 9.618 0.1757 0.00326 3.0

PD Active Pad, Dry Surface 151.67 124.25 snow 7.8PI3 Inactive Pad 3 mo 0.00 0.00 snow 7.5

West Ded Pad Channels---97.3% buried CO Open Preg Channel, Tank, or Pond 0.01 0.01 10.10 21.26 10.84 9.618 0.2472 0.00326 5.1

CC Channel Pregnant Covered 0.42 0.42 10.10 21.26 10.84 9.618 0.2472 0.00326 5.3

West Ded Pad Side Slopes-drips PSW Active Pad, Wet Surface 3.17 2.59 snow 10.29 111.67 10.84 9.618 0.1757 0.00326 3.0

PD Active Pad, Dry Surface 155.10 127.06 snow 7.8

PI12 Inactive Pad 12 mo 0.00 0.00 snow 3.0

West Ded Pad P1 Pond---WDPadPh2 Feed CC Channel Pregnant Covered 0.003 0.003 10.25 109.12 10.84 9.618 0.1885 0.00326 5.3

West Ded Pad P2 Pond---WestDedReturn CO Open Preg Channel, Tank, or Pond 0.003 0.003 10.10 21.26 10.84 9.618 0.2472 0.00326 5.1West Ded Pad P3 Pond---WDPadPh3&4Feed CC Channel Pregnant Covered 0.003 0.003 10.26 104.03 10.84 9.618 0.1850 0.00326 5.3

Active Surface Subtotal 313.47

Reusable Pad Reusable Pad (South ADR Data) PSW Active Pad, Wet Surface 2.14 1.75 snow 10.26 130.03 12.28 9.581 0.1730 0.00344 3.0

PD Active Pad, Dry Surface 47.66 39.04 snow 7.8PI3 Inactive Pad 3 mo 2.07 1.70 snow 7.5

Reusable Pad Channels (SADR data) CO Open Preg Channel, Tank, or Pond 0.36 0.36 10.17 98.64 12.28 9.581 0.2052 0.00344 5.1

Active Surface Subtotal 50.16

ADR SADR Barren Pond BP Open Barren Ponds and Solution 0.003 0.003 10.26 130.03 12.28 9.581 0.1730 0.00344 9.7

Active Surface Subtotal 0.003

Mill Leach Tank 1 TK Tanks 0.011 0.01 10.22 359.00 24.80 9.255 0.0978 0.00541 1.2

Mill Leach Tank 2 TK Tanks 0.011 0.01 10.22 359.00 24.80 9.255 0.0978 0.00541 1.2

Mill Leach Tank 3 TK Tanks 0.011 0.01 10.22 359.00 24.80 9.255 0.0978 0.00541 1.2

Mill CIL Tank 1 TK Tanks 0.011 0.01 10.22 359.00 24.80 9.255 0.0978 0.00541 1.2

Mill CIL Tank 2 TK Tanks 0.011 0.01 10.22 359.00 24.80 9.255 0.0978 0.00541 1.2

Mill CIL Tank 3 TK Tanks 0.011 0.01 10.22 359.00 24.80 9.255 0.0978 0.00541 1.2

Mill CIL Tank 4 TK Tanks 0.011 0.01 10.22 359.00 24.80 9.255 0.0978 0.00541 1.2

Mill CIL Tank 5 TK Tanks 0.011 0.01 10.22 359.00 24.80 9.255 0.0978 0.00541 1.2

Mill CIL Tank 6 TK Tanks 0.011 0.01 10.22 359.00 24.80 9.255 0.0978 0.00541 1.2

Mill South Ded Pad CIC tanks (indoor) CO Open Preg Channel, Tank, or Pond 0.050 0.05 11.56 62.17 10.84 9.618 0.0114 0.00326 5.1

Mill West Ded Pad CIC tanks (indoor) CO Open Preg Channel, Tank, or Pond 0.050 0.05 10.10 21.26 10.84 9.618 0.2472 0.00326 5.1Mill Reusable Ded Pad CIC tanks (indoor) CO Open Preg Channel, Tank, or Pond 0.050 0.05 10.17 98.64 12.28 9.581 0.2052 0.00344 5.1Tails Tailings Impoundment TA Tails, Aqueous Surface 13.39 13.39 8.15 5.00 4.72 9.777 0.9772 0.00261 1.2

TW Tails, Wet Sediment 38.52 31.56 snow 2.9

TD Tails, Dry Sediment 154.09 126.23 snow 5.8

Active Surface Subtotal 51.91

Snow and Ice Adjustments Psn Pad, Snow Covered 96.57 snow 2.9

Tsn Tails, Snow Covered 34.83 snow 8.9

Snow Covered Surface Subtotal 131.4

TOTAL AREA 741.54 741.54 

D R A F T 
GOLD QUARRY HCN EMISSIONS 26% snow Wind: 

2008 Surface Area and 2008 Solution Data 20.8% ice 

Snow Cover Solution Parameters 

Adjustment Free CN- T kG o

Area Source Cat. Category Description Acres Acres pH g/m3 C pKa a0 H m/s o

SAL Property Property Leach Pad PSW Active Pad, Wet Surface 13.11 9.66 snow 9.35 42.11 16.50 9.471 0.5691 0.00400 7.3

PD Active Pad, Dry Surface 14.96 11.02 snow 1.1PI1 Inactive Pad 1 mo 40.08 29.53 snow 3.7PI12 Inactive Pad 12 mo 154.92 114.15 snow 6.8

P Leach Pad Preg. Pond CO Open Preg Channel, Tank, or Pond 2.18 2.182 8.71 1.48 16.70 9.466 0.8507 0.00403 1.9PLP Solution Transfer Channel CO Open Preg Channel, Tank, or Pond 0.31 0.312 8.71 1.48 16.70 9.466 0.8507 0.00403 1.9Barren Solution Handling (ponding) BP Open Barren Ponds and Solution 0.09 0.073 ice 9.42 42.11 16.50 9.471 0.5293 0.00400 1.7

Active Surface Subtotal 30.66

SAL Non-PropertNon-Property Leach Pad PSW Active Pad, Wet Surface 15.15 11.16 snow 9.35 42.11 16.50 9.471 0.5691 0.00400 7.3

PD Active Pad, Dry Surface 17.46 12.87 snow 1.1

PI1 Inactive Pad 1 mo 45.63 33.62 snow 3.7PI12 Inactive Pad 12 mo 180.40 132.92 snow 6.8

NP Leach Pad Preg. Ponds CO Open Preg Channel, Tank, or Pond 2.76 2.76 8.71 1.48 16.70 9.466 0.8507 0.00403 1.9

Barren Solution Handling (ponding) BP Open Barren Ponds and Solution 0.11 0.09 ice 9.42 42.11 16.50 9.471 0.5293 0.00400 1.7

Active Surface Subtotal 35.48

CIC Carbon Xfer Screens for Leach CO Open Preg Channel, Tank, or Pond 0.004 0.004 8.71 1.48 16.70 9.466 0.8507 0.00403 1.9

CIC Tanks for Leach Operations CO Open Preg Channel, Tank, or Pond 0.043 0.043 8.71 1.48 16.70 9.466 0.8507 0.00403 1.9

Active Surface Subtotal 0.046

Mills 5 and 6 CIL Tanks for Mill 5 Circuit TK Tanks 0.29 0.29 10.52 61.75 15.83 9.488 0.0851 0.00391 3.6

CIC Tanks for Mill 5 Circuit TK Tanks 0.02 0.02 10.52 61.75 15.83 9.488 0.0851 0.00391 3.6

Tails Screen for Mill 5 Circuit TK Tanks 0.01 0.01 10.52 61.75 15.83 9.488 0.0851 0.00391 3.6

Mill 5 Thickener Tank TA Tails, Aqueous Surface 0.22 0.22 8.55 0.59 13.20 9.557 0.9113 0.00355 2.4Surge Tanks for Mill 5 Circuit TA Tails, Aqueous Surface 0.09 0.09 8.55 0.59 13.20 9.557 0.9113 0.00355 2.4Flotation Thickener Tank(s) TA Tails, Aqueous Surface 0.07 0.07 8.55 0.59 13.20 9.557 0.9113 0.00355 2.4CIL Tanks for Mill 6 Circuit TK Tanks 0.23 0.23 10.11 70.59 51.25 8.568 0.0279 0.01414 3.6CIP Tanks for Mill 6 Circuit TK Tanks 0.01 0.01 10.11 70.59 51.25 8.568 0.0279 0.01414 3.6Mill 6 Thickener Tank TA Tails, Aqueous Surface 0.13 0.13 9.10 0.59 24.98 9.251 0.5869 0.00545 2.4Mill 6 Quench Tanks TA Tails, Aqueous Surface 0.06 0.06 9.10 0.59 24.98 9.251 0.5869 0.00545 2.4Mill 6 Neutralization TA Tails, Aqueous Surface 0.05 0.05 9.10 0.59 24.98 9.251 0.5869 0.00545 2.4Mill 6 Quench Pond TA Tails, Aqueous Surface 1.08 1.08 9.10 0.59 24.98 9.251 0.5869 0.00545 2.4Spray Area (Quench Pond) TA Tails, Aqueous Surface 1.72 1.72 9.10 0.59 24.98 9.251 0.5869 0.00545 2.4

Tails Mills 5/6 Tailings Pond TA Tails, Aqueous Surface 77.52 61.37 ice 8.55 0.59 13.20 9.557 0.9104 0.00355 2.4

Mills 5/6 Tailings Pond Wet Beach TW Tails, Wet Sediment 273.60 201.60 snow 8.75 1.40 21.18 9.349 0.7976 0.00475 1.1

Mills 5/6 Tailings Pond Dry Beach TD Tails, Dry Sediment 104.88 77.28 snow 4.1

Active Surface Subtotal 351.12

Snow and Ice Adjustments Psn Pad, Snow Covered 126.76 snow 1.5

Tsn Tails, Snow Covered 99.60 snow 1.3

TAice Tails, Aqueous, Frozen 16.15 ice 4.2

Bice Barren Solution, Frozen 0.04 ice 1.2

Snow/Ice Covered Surface Subtotal 242.6

TOTAL AREA 947.18 947.18 

D R A F T 
CORTEZ HCN EMISSIONS 66 days w/ 0.5+ in. 18% snow Wind: 

November 3, 2009 Surface Area and 2008 Solution Parameters 

Snow Cover Solution Parameters C

Adjustment Free CN- T kG o

Area Source Cat. Category Description Acres Acres pH g/m3 C pKa a0 H m/s o

Area 28 & Tails Area 28 Pad PSW Active Pad, Wet Surface 27.68 22.67 snow 10.00 62.11 14.50 9.523 0.2501 0.00372 7.1Impoundment PD Active Pad, Dry Surface 17.96 14.71 snow 4.0

PI Inactive Pad 104.41 85.53 snow 1.3

Area 28 Barren Pond BP Open Barren Ponds and Solution 0.0001 0.0001 10.00 7.70 11.30 9.606 0.2877 0.00332 3.9Area 28 Pregnant Pond CO Open Preg Channel, Tank, or Pond 0.002 0.002 10.00 7.70 11.30 9.606 0.2877 0.00332 4.3Area 28 CIC Tanks CO Open Preg Channel, Tank, or Pond 0.113 0.113 10.50 55.74 16.80 9.463 0.0841 0.00405 4.3Tailings Impoundment TA Tails, Aqueous Surface 15.63 12.80 snow 10.40 10.17 15.00 9.510 0.1141 0.00379 6.3

TW Tails, Wet Sediment 29.95 24.53 snow 1.0TD Tails, Dry Sediment 179.33 146.90 snow 2.5

Active Surface Subtotal 91.34

Area 30 Area 30 Pad PSW Active Pad, Wet Surface 105.37 86.32 snow 10.10 65.56 14.50 9.523 0.2094 0.00372 7.1

PD Active Pad, Dry Surface 117.43 96.20 snow 4.0PI Inactive Pad 235.40 192.83 snow 1.3

Area 30 Barren Pond BP Open Barren Ponds and Solution 0.0002 0.0002 10.08 9.82 11.30 9.606 0.2514 0.00332 3.9Area 30 Pregnant Pond CO Open Preg Channel, Tank, or Pond 0.001 0.001 10.08 9.82 11.30 9.606 0.2514 0.00332 4.3Area 30 CIC Tanks CO Open Preg Channel, Tank, or Pond 0.019 0.019 10.50 55.74 16.80 9.463 0.0841 0.00405 4.3

Active Surface Subtotal 222.82

Mill Surge Tank TA Tails, Aqueous Surface 0.037 0.037 9.90 10.30 0.00 9.900 0.5000 0.00220 6.3

Reclaim Water Tank TA Tails, Aqueous Surface 0.014 0.014 9.90 10.30 0.00 9.900 0.5000 0.00220 6.3Mixer Tank TK Tanks 0.014 0.014 11.00 166.00 24.20 9.271 0.0183 0.00530 2.2Thickener Tank TK Tanks 0.076 0.076 11.00 166.00 24.20 9.271 0.0183 0.00530 2.2CIL Tank 1 TK Tanks 0.057 0.057 11.00 166.00 24.20 9.271 0.0183 0.00530 2.2CIL Tank 2 TK Tanks 0.057 0.057 11.00 166.00 24.20 9.271 0.0183 0.00530 2.2CIL Tank 3 TK Tanks 0.057 0.057 11.00 166.00 24.20 9.271 0.0183 0.00530 2.2CIL Tank 4 TK Tanks 0.057 0.057 11.00 166.00 24.20 9.271 0.0183 0.00530 2.2CIL Tank 5 TK Tanks 0.057 0.057 10.50 72.00 24.20 9.271 0.0557 0.00530 2.2CIL Tank 6 TK Tanks 0.057 0.057 10.50 72.00 24.20 9.271 0.0557 0.00530 2.2CIL Tank 7 TK Tanks 0.057 0.057 10.50 72.00 24.20 9.271 0.0557 0.00530 2.2CIL Tank 8 TK Tanks 0.057 0.057 10.50 72.00 24.20 9.271 0.0557 0.00530 2.2Clarifier TK Tanks 0.076 0.076 10.35 65.00 21.67 9.337 0.0884 0.00483 2.2Clarifier TK Tanks 0.076 0.076 10.35 65.00 21.67 9.337 0.0884 0.00483 2.2Mill CIC TK Tanks 0.004 0.004 10.50 178.00 16.80 9.463 0.0841 0.00405 2.2

Mill CIC Mill CIC TK Tanks 0 004. 0.004 10.50 178.00 16.80 9.463 0.0841 0.00405 2.2

10 50 178 00 16 80 9 463 0 0841 0 00405 2 2

Mill CIC TK Tanks 0.004 0.004 10.50 178.00 16.80 9.463 0.0841 0.00405 2.2

Mill CIC TK Tanks 0.004 0.004 10.50 178.00 16.80 9.463 0.0841 0.00405 2.2

Mill CIC TK Tanks 0.004 0.004 10.50 178.00 16.80 9.463 0.0841 0.00405 2.2

Av

Snow and Ice Adjustments Psn Pad, Snow Covered 109.98 snow 2.2

Tsn Tails, Snow Covered 40.67 snow 1.1

Snow Covered Surface Subtotal 150.7

TOTAL AREA 834.06 834.06 

D R A F T 
GOLDSTRIKE HCN EMISSIONS 93 days w/ 0.5+ in. 25% snow Wind: m/s 

2009 Surface Area and 2009 Solution Data 3.07 

Snow Cover Solution Parameters Overall

Adjustment Free CN- T kG or Flux 

Area Source Cat. Category Description Acres Acres pH g/m3 C pKa a0 H m/s or g/m2-s Fa*F

Tails North Tailings Impoundment TA Tails, Aqueous Surface 253 188.54 snow 8.60 1.10 9.41 9.655 0.9191 0.00310 1.57E-05 0.41 

TW Tails, Wet Sediment 162 120.72 snow 8.60 1.10 9.41 9.655 0.9191 0.00310 1.02E-05 0.41 

TD Tails, Dry Sediment 117 87.19 snow 2.33E-08 1.00 

Active Surface Subtotal 415.00

Inactive Tails AA Tailings Impoundment (inactive) TA Tails, Aqueous Surface 47 35.02 snow 8.37 0.012 9.41 9.655 0.9513 0.00310 1.57E-05 0.46 

TW Tails, Wet Sediment 14 10.43 snow 8.37 0.012 9.41 9.655 0.9513 0.00310 1.02E-05 0.46 

TD Tails, Dry Sediment 0 0.00 snow 2.33E-08 1.00 

Active Surface Subtotal 61.00

Roaster CIL Tank 1 TK Tanks 0.042 0.042 9.28 70.44 42.20 8.803 0.2521 0.01018 2.51E-04 0.69 

CIL Tank 2 TK Tanks 0.042 0.042 9.20 57.88 42.20 8.803 0.2870 0.01018 2.51E-04 0.69 

CIL Tank 3 TK Tanks 0.042 0.042 9.12 48.93 42.20 8.803 0.3247 0.01018 2.51E-04 0.69 

CIL Tank 4 TK Tanks 0.042 0.042 9.12 40.83 42.20 8.803 0.3247 0.01018 2.51E-04 0.69 

CIL Tank 5 TK Tanks 0.042 0.042 9.00 36.27 42.20 8.803 0.3861 0.01018 2.51E-04 0.69 

CIL Tank 6 TK Tanks 0.042 0.042 9.00 31.44 42.20 8.803 0.3861 0.01018 2.51E-04 0.69 

CN Destruct. Tank (Roaster) TK Tanks 0.042 0.042 9.00 31.44 42.20 8.803 0.3861 0.01018 2.51E-04 0.69 

Wet Mill CIL Train A Tank 0 TK Tanks 0.042 0.042 9.86 82.31 42.65 8.791 0.0792 0.01034 2.51E-04 0.69 

CIL Train A Tank 1 TK Tanks 0.042 0.042 9.86 82.31 42.65 8.791 0.0792 0.01034 2.51E-04 0.69 

CIL Train A Tank 2 TK Tanks 0.042 0.042 9.86 82.31 42.65 8.791 0.0792 0.01034 2.51E-04 0.69 

CIL Train A Tank 3 TK Tanks 0.020 0.020 9.86 82.31 42.65 8.791 0.0792 0.01034 2.51E-04 0.71 

CIL Train A Tank 4 TK Tanks 0.020 0.020 9.67 44.88 42.65 8.791 0.1178 0.01034 2.51E-04 0.71 

CIL Train A Tank 5 TK Tanks 0.020 0.020 9.67 44.88 42.65 8.791 0.1178 0.01034 2.51E-04 0.71 

CIL Train A Tank 6 TK Tanks 0.020 0.020 9.67 44.88 42.65 8.791 0.1178 0.01034 2.51E-04 0.71 

CIL Train A Tank 7 TK Tanks 0.042 0.042 9.67 44.88 42.65 8.791 0.1178 0.01034 2.51E-04 0.69 

CIL Train B Tank 0 TK Tanks 0.042 0.042 9.87 80.87 59.76 8.346 0.0292 0.01926 2.51E-04 0.69 

CIL Train B Tank 1 TK Tanks 0.042 0.042 9.87 80.87 59.76 8.346 0.0292 0.01926 2.51E-04 0.69 

CIL Train B Tank 2 TK Tanks 0.042 0.042 9.87 80.87 59.76 8.346 0.0292 0.01926 2.51E-04 0.69 

CIL Train B Tank 3 TK Tanks 0.020 0.020 9.87 80.87 59.76 8.346 0.0292 0.01926 2.51E-04 0.71 

CIL Train B Tank 4 TK Tanks 0.020 0.020 9.72 51.46 59.76 8.346 0.0408 0.01926 2.51E-04 0.71 

CIL Train B Tank 5 TK Tanks 0.020 0.020 9.72 51.46 59.76 8.346 0.0408 0.01926 2.51E-04 0.71 

CIL Train B Tank 6 TK Tanks 0.020 0.020 9.72 51.46 59.76 8.346 0.0408 0.01926 2.51E-04 0.71 

CIL Train B Tank 7 TK Tanks 0.042 0.042 9.72 51.46 59.76 8.346 0.0408 0.01926 2.51E-04 0.69 

CN Destruct. Tank (Autoclave) TK Tanks 0.042 0.042 9.69 48.17 51.20 8.569 0.0701 0.01411 2.51E-04 0.69 

Snow and Ice Adjustments Tsn Tails, Snow Covered 151.09 snow 1.17E-08 1.00 

Snow Covered Surface Subtotal 151.1

TOTAL AREA 593.82 593.82 
TWIN CREEKS HCN EMISSIONS 79 days w/ 0.5+ in. 22% snow Wind: m/s 

2008 Surface Area and 2008 Solution Data 1.54 

Snow Cover Solution Parameters Overall

Adjustment Free CN- T kG or Flux 

Area Source Cat. Category Description Acres Acres pH g/m3 C pKa a0 H m/s or g/m2-s Fa*F

Tailings Sage / Juniper Tailings Impoundment TA Tails, Aqueous Surface 227.53 227.53 7.95 0.45 14.50 9.523 0.9740 0.00372 1.57E-05 0.41 

TW Tails, Wet Sediment 110.98 86.96 snow 7.98 1.23 19.25 9.400 0.9633 0.00442 1.02E-05 0.41 

TD Tails, Dry Sediment 258.96 202.91 snow 2.33E-08 1.00 

Active Surface Subtotal 338.51

Leach Pad Sonoma Leach Pad PSW Active Pad, Wet Surface 3.16 2.48 snow 9.28 102.85 9.00 9.666 0.7086 0.00305 5.00E-06 0.45 

PD Active Pad, Dry Surface 3.87 3.03 snow 7.86E-08 0.45 

PI Inactive Pad 223.25 174.93 snow 1.95E-08 1.00 

Izzenhood Leach Pad PSW Active Pad, Wet Surface 14.63 11.46 snow 9.84 116.00 9.00 9.666 0.4012 0.00305 5.00E-06 0.45 

PD Active Pad, Dry Surface 17.88 14.01 snow 7.86E-08 0.45 

PI Inactive Pad 188.01 147.32 snow 1.95E-08 1.00 

Osgood Leach Pad PSW Active Pad, Wet Surface 10.60 8.31 snow 9.84 116.00 9.00 9.666 0.4012 0.00305 5.00E-06 0.45 

PD Active Pad, Dry Surface 12.96 10.15 snow 7.86E-08 0.45 

PI Inactive Pad 161.98 126.92 snow 1.95E-08 1.00 

North Pregnant Pond CO Open Preg Channel, Tank, or Pond 0.416 0.42 9.21 1.62 9.00 9.666 0.7408 0.00305 1.87E-05 0.45 

South Pregnant Pond CO Open Preg Channel, Tank, or Pond 1.135 1.14 6.93 0.02 9.00 9.666 0.9982 0.00305 1.87E-05 0.45 

South Barren Pond CO Open Preg Channel, Tank, or Pond 1.135 1.14 9.57 0.02 9.00 9.666 0.5550 0.00305 1.87E-05 0.45 

N5 Pregnant Pond CO Open Preg Channel, Tank, or Pond 0.046 0.05 8.08 0.00 9.00 9.666 0.9747 0.00305 1.87E-05 0.45 

N5 Intermediate Pond CO Open Preg Channel, Tank, or Pond 1.033 1.03 9.28 0.00 9.00 9.666 0.7086 0.00305 1.87E-05 0.45 

North Intermediate Pond CO Open Preg Channel, Tank, or Pond 1.033 1.03 9.28 33.20 9.00 9.666 0.7086 0.00305 1.87E-05 0.45 

South Intermediate Pond CO Open Preg Channel, Tank, or Pond 1.033 1.03 9.49 33.20 9.00 9.666 0.5999 0.00305 1.87E-05 0.45 

North Area Carbon Screen CO Open Preg Channel, Tank, or Pond 0.001 0.00 9.20 2.32 9.00 9.666 0.7452 0.00305 1.87E-05 0.45 

South Area Carbon Screen CO Open Preg Channel, Tank, or Pond 0.0004 0.00 7.70 0.02 9.00 9.666 0.9893 0.00305 1.87E-05 0.45 

North Area CIC Tanks CO Open Preg Channel, Tank, or Pond 0.013 0.01 9.21 2.45 9.00 9.666 0.7408 0.00305 1.87E-05 0.45 

South Area CIC Tanks CO Open Preg Channel, Tank, or Pond 0.006 0.01 7.73 0.02 9.00 9.666 0.9885 0.00305 1.87E-05 0.45 

Active Surface Subtotal 68.95

Mills Thickener Tank TK Tanks 0.721 0.721 9.47 0.45 40.60 8.844 0.1915 0.00960 2.51E-04 0.58 

Juniper/Sage CIL Tanks TK Tanks 0.341 0.341 9.47 58.00 40.60 8.844 0.1915 0.00960 2.51E-04 0.60 

Juniper/Sage Tails Screen TK Tanks 0.003 0.003 7.90 2.41 24.00 9.276 0.9596 0.00526 2.51E-04 0.78 

Snow and Ice Adjustments Tsn Tails, Snow Covered 80.07 snow 1.17E-08 1.00 

Psn Pad, Snow Covered 137.73 snow 1.84E-08 1.00 

Snow Covered Surface Subtotal 217.8

TOTAL AREA 1240.73 1240.73