From: "Barbanell, Melissa (Salt Lake City)" <mbarbanell@barrick.com> 

 

 To: Chuck French/RTP/USEPA/US@EPA 

 Cc: <klewis@airsci.com>, <matt.zietlow@goldcorp.com> 

 

 Date: 03/03/2010 08:07 PM 

 Subject: FW: Marigold HCN emissions 

Chuck, 

Attached please find the Marigold HCN emissions calculations. Please feel free to contact me if 

you have any questions. 

Thanks, 

Melissa 
MARIGOLD HCN EMISSIONS 51 days w/ 0.5+ in. 14% snow Wind: 

2009 Surface Area and 2009 Solution Parameters 

Snow Cover Solution Parameters Ove

Adjustment Free CN- T kG or 

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

Leach Pad Leach Pad PSW Active Pad, Wet Surface 45.00 38.71 snow 10.41 84.71 10.08 9.638 0.1433 0.00317 5.00

PD Active Pad, Dry Surface 45.00 38.71 snow 10.41 84.71 10.08 9.638 0.1433 0.00317 7.82

PI Inactive Pad 187.00 160.87 snow 1.95

Barren Ponds 1 and 2 BP Open Barren Ponds and Solution 2.2 2.2 10.41 84.71 10.08 9.638 0.1433 0.00317 8.37

Pregnant Ponds 1, 2 and 3 CO Open Preg Channel, Tank, or Pond 0.080 0.1 9.86 25.66 10.08 9.638 0.3763 0.00317 1.87

CIC Tanks (20) CO Open Preg Channel, Tank, or Pond 0.036 0.036 9.86 25.66 10.08 9.638 0.3763 0.00317 1.87

Active Surface Subtotal 92.32

Snow Adjustments Psn Pad, Snow Covered 38.70 snow 1.84

Snow Covered Surface Subtotal 38.7

TOTAL AREA 279.32 279.32 
Table 1: Measured Flux Rates

Cat. HCN Flux (ug/m2-min)

Category ID CTZ GQ RM Overall Category DescriptionPonds/Channels CC 0.62 4 0.62 Channel Pregnant Covered

CO 25.38 2 28.88 4 5.08 5 12.81 Open Preg Channel, Tank, or PondBP 222.96 6 1155.65 5 712.57 7 553.30 Open Barren Ponds and Solution

Tails TA 42.62 6 15.39 4 0.96 4 10.79 Tails, Aqueous Surface

TW 6.46 5 5.50 4 1.80 10 3.18 Tails, Wet SedimentTD 1.55 2 2.50 2 0.35 1 1.40 Tails, Dry Sediment

Active Pads PSW 21.92 13 48.64 20 43.25 25 38.67 Active Pad, Wet Surface

Psprink 72.98 2 265.85 3 158.51 Active Pad, Sprinkler, Wet SurfacePD 2.45 3 7.05 5 4.68 7 4.72 Active Pad, Dry Surface

Inactive Pads PI 0.78 16 1.17 Inactive Pad

PI1 2.22 3 Inactive Pad 1 moPI3 4.52 4 Inactive Pad 3 moPI12 0.41 2 1.82 3 Inactive Pad 12 mo

Tanks TK 574.50 8 212.12 12 847.97 6 396.83 TanksIce/Snow Psn 0.92 5 1.74 2 1.11 Pad, Snow Covered

Tsn 0.80 2 0.54 1 0.70 Tails, Snow CoveredBice 7.69 1 7.69 Barren Solution, FrozenTAice 0.62 1 2.53 4 1.90 Tails, Aqueous, Frozen

Table 2: Measured Mass Transfer Coefficients

Cat. kG (m/s)

Category ID CTZ GQ RM Overall Category DescriptionPonds/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 1.87E-05 Open Preg Channel, Tank, or PondBP 3.91E-05 6 1.70E-04 5 9.70E-05 7 8.37E-05 Open Barren Ponds and Solution

Tails TA 6.35E-05 6 2.43E-05 4 1.26E-06 4 1.57E-05 Tails, Aqueous Surface

TW 9.62E-06 5 1.13E-05 3 1.02E-05 Tails, Wet SedimentTD 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 5.00E-06 Active Pad, Wet Surface

Psprink 2.70E-05 2 4.37E-05 3 3.60E-05 Active Pad, Sprinkler, Wet SurfacePD 7.05E-07 3 2.48E-06 1 6.61E-07 5 7.82E-07 Active Pad, Dry Surface

Inactive Pads PI Inactive Pad

PI1 Inactive Pad 1 moPI3 Inactive Pad 3 moPI12 Inactive Pad 12 mo

Tanks TK 2.27E-04 4 3.64E-04 12 1.29E-04 6 2.51E-04 TanksIce/Snow Psn 2.02E-07 2 1.17E-07 1 1.69E-07 Pad, Snow Covered

Tsn Tails, Snow CoveredBice 1.40E-06 1 1.40E-06 Barren Solution, FrozenTAice 9.17E-07 1 9.17E-07 Tails, Aqueous, Frozen