### Source Emissions Testing Report Barrick Cortez, Inc.
Hydrogen Cyanide Emissions Electrowinning Cells #1 & #2

Cortez Mine Crescent Valley, Nevada

Report prepared for: Report prepared by: Mr. Brent Downey Barrick Cortez, Inc. Star Route HC 66 Box 1250 Crescent Valley, NV 89821 Matt McGregor Technical Writer

Test Dates: November 11 – 12, 2009
APT Project: BAR9395

# Table of Contents

1. Introduction ...................................

................................................... .. 1 2. Methods.....................................................

...................................... 1 3. Test Program Summary....................................

............................... 2
4. Test Method Details.......................................

.................................. 2
5. Results...............................................................

.......................... 3

Tables Table 1.1 : Testing Program Contact Personnel......

......................... 1 Table 3.1 : Sampling and Analytical Methods........

........................... 2 Table 5.1 : Test Results Summary, EW Cell #1.................

.......... 4 Table 5.2 : Test Results Summary, EW Cell #2.................

.......... 4
Appendices
Testing Parameters.................................

.................................... Appendix 1 Field Data..................

..................................................... ............... Appendix 2 Laboratory Data.........

........................................................... ......... Appendix 3 Calibration Data.................................................

............................ Appendix 4 Schematics...........................................................

........................ Appendix 5

### APT Project BAR9395 Test Report – Cortez Mine HCN Testing

page 1 1. Introduction
Air Pollution Testing, Inc. (APT) was contracted by Barrick Cortez, Inc. (Cortez) for source emissions test services conducted at the Cortez Min e facility located near Crescent Valley, Nevada.
The purpose of the emissions testing program was to quantify the emission levels of hydrogen cyanide (HCN) from two electrowinning (EW) cells (EW Cell #1 and EW Cell #2) currently in service at the facility.
Contact personnel are provided in Table 1.1 below.

Barrick Cortez, Inc. : Cortez Mine HCN Testing Emissions Testing Program Contact Personnel Name, Title Company, Address Phone, FAX, email
Mr. Brent Downey, Chief Environmental Engineer Barrick Cortez, Inc. Star Route HC 66 Box 1250 Crescent Valley, Nevada 89821 775-468-4547, 775-468-4496, bdowney@barrick.com

Mr. Frank Smith, Project Manager ALS Laboratory Group 960 W Levoy Drive Salt Lake City, Utah 84123 801-266-7700, 801-268-9992, frank.smith@alsenviro.com

Mr. Chris Keefe, Director of Operations Air Pollution Testing, Inc. 5530 Marshall Street Arvada, Colorado 80002 303-420-5949 ext. 24, 303-420-5920, ckeefe@airtest.net 

### Table 1.1: Emissions Testing Program Contact Perso nnel

2. Methods
The test program was conducted in accordance with t he following U.S. Environmental Protection Agency source emissions test methods ref erenced in 40 CFR Part 60, Appendix A

. Method 1 – Sample and Velocity Traverses for Stati onary Sources
Method 2 – Determination of Stack Gas Velocity and Volumetric Flow Rate
Method 3 – Gas Analysis for the Determination of D ry Molecular Weight

### APT Project BAR9395 Test Report – Cortez Mine HCN Testing

page 2 Method 4 – Determination of Moisture Content in St ack Gases
CTM-033 Draft Method XHCN – Sampling and Analysis for Hydrogen Cyanide Emissions from Stationary Sources
3. Test Program Summary
APT provided all necessary equipment and labor for the determination of all parameters detailed in Table 3.1 below. Integrated samples we re collected for off-site analysis to determine the HCN content of the stack gas.
At both EW cells, three 60-minute test runs were co nducted. Each EW cell is controlled with a carbon bed.

Barrick Cortez, Inc. : Cortez Mine HCN Testing Sampling and Analytical Methods

Parameter Sampling Method Analytical Method Laboratory gas flow Methods 1, 2 draft gauge, thermocouple, pitot tube
O 2 , CO 2 Method 3 wet chemical (Orsat instrument)

H 2 O Method 4 gravimetric APT, on-site

HCN CTM-033 Ion specific electrode (ISE) ALS Laboratory Group, Salt Lake City, Utah 

### Table 3.1: Sampling and Analytical Methods Summary

4. Test Method Details
Stack gas flow rate, diluent (oxygen and carbon dio xide) and hydrogen cyanide (HCN) emissions were determined in accordance with EPA me thods 1 – 4 and CTM-033 Draft Method XHCN.
Each sampling period consisted of conducting a temp erature and differential pressure traverse of the stack with a K-type thermocouple an d an S-type pitot tube. Concurrently, a gas sample was extracted at an isokinetic flow rate for a sixty minute period. The gas passed through a nozzle, a heated glass probe, acro ss a heated glass fiber filter, through a series of 4 chilled glass impingers, and through a calibrated dry gas meter. Please see Appendix 5 – Schematics for a diagram of the conditional test method sampl ing train.

### APT Project BAR9395 Test Report – Cortez Mine HCN Testing

page 3 During each sampling run, a stack gas sample was co llected in a clean, leak-free Tedlar bag for subsequent diluent analysis using an Orsat instrument.
Prior to sampling, the first two impingers were see ded with 100 milliliters of 0.1N sodium hydroxide (NaOH). The third impinger was empty. Th e fourth impinger was seeded with 250 grams of dried silica gel.
The impingers were recovered along with NaOH rinses in a nalgene container for ion specific electrode (ISE) analysis.
As a QA/QC measure, a reagent blank plus a train bl ank at each stack were analyzed and HCN was not detected. Analysis was conducted by AL S Laboratory Group in Salt Lake City, Utah who have current AIHA certification for HCN analysis.

All of the above data were combined to calculate th e stack gas velocity and volumetric flow rate in units of feet per second (ft/sec), actual c ubic feet per minute (acfm), dry standard cubic feet per minute (dscfm), and pounds per hour (lb/hr). The stack gas HCN emissions were calculated in units of parts per million, dry volume basis (ppmvd) and pounds per hour (lb/hr).

5. Results
The results of the testing are presented in Tables 5.1 and 5.2. Any testing parameters not found in the tables may be found in Appendix 1 – Testing Parameters

. °F – temperature, measured in degrees Fahrenheit (° F)
dscfm – dry standard (68°F, 1 atmosphere) cubic fee t per minute

H 2 

### O (%vw) – stack gas water vapor content (wet volume percent)
lb/hr – pounds per hour
ppmvd – parts per million, dry volume basis

### APT Project BAR9395 Test Report – Cortez Mine HCN Testing

page 4 Barrick Cortez, Inc. – Cortez Mine HCN Testing Test Results Summary, EW Cell #1 (November 11 – 12, 2009) Run #1 Run #2 Run #3 Average
Date 11/11/09 11/12/09 11/12/09
Start Time 16:34 9:29 12:38 Stop Time 17:42 10:38 13:43 Sampling Time (minutes) 60 60 60 60 Stack Temp. (°F) 105 104 104 104 Stack Flow (dscfm) 1,663 1,670 1,664 1,666
H 2 O (%vw) 4.1 3.9 3.0 3.7
% isokinetic 102.7 100.8 101.6 101.7
Emissions Data HCN (ppmvd) 0.11 0.04 0.09 0.08 HCN (lb/hr) 0.0008 0.0003 0.0007 0.0006



### Table 5.1: Test Results Summary, EW Cell #1

Barrick Cortez, Inc. – Cortez Mine HCN Testing Test Results Summary, EW Cell #2 (November 12, 2009 ) Run #1 Run #2 Run #3 Average
Start Time 14:38 15:58 17:24 Stop Time 15:42 17:03 18:31 Sampling Time (minutes) 60 60 60 60 Stack Temp. (°F) 105 102 102 103 Stack Flow (dscfm) 1,583 1,671 1,636 1,630
H 2 O (%vw) 2.5 2.1 2.5 2.4
% isokinetic 102.4 99.6 98.5 100.2
Emissions Data HCN (ppmvd) 0.05 0.04 0.03 0.04 HCN (lb/hr) 0.0003 0.0002 0.0002 0.0003



### Table 5.2: Test Results Summary, EW Cell #2Barrick Cortez, Inc.

Cortez Mine Crescent Valley, NV EW Cell #1 11/11/09-11/12/09

CTM-033 Draft Method XHCN

Run # 1 2 3 Average

date 11/11/09 11/12/09 11/12/09 start time 16:34 9:29 12:38 stop time 17:42 10:38 13:43 sampling time (minutes) 60.0 60.0 60.0

D S stack diameter (inches) 15.0 15.0 15.0 15.0 √∆ P AVG average (delta P) 1⁄2 (" H 2 O) 1⁄2 0.479 0.481 0.476 0.479 C P pitot tube constant (unitless) 0.83 0.83 0.83 0.83 T S stack temp. (°F) 105 104 104 104 P bar barometric pressure (mbar) 837 833 833 834 P bar barometric pressure (" Hg) 24.72 24.60 24.60 24.64 Ps stack pressure (" H 2 O) -0.15 -0.15 -0.15 -0.15 Y d meter box Y d (unitless) 1.013 1.013 1.013 1.013 T m meter temp. (°F) 76 72 74 74 V m sample volume (ft 3 ) 48.523 47.667 48.083 48.091 ∆ H orifice setting delta H (" H 2 O) 1.6 1.6 1.5 1.6 V lc moisture (g) 36.1 33.9 26.4 32.1 O 2 %vd oxygen (%vd) 20.7 20.8 20.8 20.8 CO 2 %vd carbon dioxide (%vd) 0.0 0.0 0.0 0.0 inches nozzle diameter (inches) 0.297 0.297 0.297 0.297

Run # 1 2 3 Average micrograms mass HCN (ug) 140 54 120 105 grams mass HCN (g) 0.0001 0.0001 0.0001 0.0001

Run # 1 2 3 Average V mstd sample volume (dscf) 40.175 39.570 39.761 39.835

sample volume (dscm) 1.138 1.120 1.126 1.128 V wstd moisture volume (dscf) 1.699 1.596 1.243 1.513 B ws measured moisture content (%/100) 0.041 0.039 0.030 0.0 37

saturated moisture content (%/100) 0.091 0.089 0.089 0. 089 actual moisture content (%/100) 0.041 0.039 0.030 0.037 M D molecular weight (dry) 28.83 28.83 28.83 28.83 M A molecular weight (actual) 28.39 28.41 28.50 28.43 V S gas velocity (ft/sec) 30.5 30.7 30.3 30.5 F ACFM gas flow (acfm) 2,246 2,258 2,231 2,245 F DSCFM gas flow (dscfm) 1,663 1,670 1,664 1,666 lb/hr gas flow (lb/hr) 7,656 7,679 7,611 7,649 % % isokinetic 102.7 100.8 101.6 101.7

lb/hr HCN (lb/hr) 0.0008 0.0003 0.0007 0.0006 ppmvd HCN (ppmvd) 0.11 0.04 0.09 0.08 Field Reference Method Data

Laboratory Data

Reference Method CalculationsBarrick Cortez, Inc.

Cortez Mine Crescent Valley, NV EW Cell #2 11/12/2009

CTM-033 Draft Method XHCN

Run # 1 2 3 Average

start time 14:38 15:58 17:24 stop time 15:42 17:03 18:31 sampling time (minutes) 60.0 60.0 60.0

D S stack diameter (inches) 15.0 15.0 15.0 15.0 √∆ P AVG average (delta P) 1⁄2 (" H 2 O) 1⁄2 0.451 0.473 0.465 0.463 C P pitot tube constant (unitless) 0.83 0.83 0.83 0.83 T S stack temp. (°F) 105 102 102 103 P bar barometric pressure (mbar) 833 833 833 833 P bar barometric pressure (" Hg) 24.60 24.60 24.60 24.60 Ps stack pressure (" H 2 O) -0.15 -0.15 -0.15 -0.15 Y d meter box Y d (unitless) 1.013 1.013 1.013 1.013 T m meter temp. (°F) 77 75 76 76 V m sample volume (ft 3 ) 46.348 47.392 46.002 46.581 ∆ H orifice setting delta H (" H 2 O) 1.5 1.5 1.5 1.5 V lc moisture (g) 20.7 17.6 20.6 19.6 O 2 %vd oxygen (%vd) 20.6 20.7 20.8 20.7 CO 2 %vd carbon dioxide (%vd) 0.0 0.0 0.0 0.0 inches nozzle diameter (inches) 0.297 0.297 0.297 0.297

Run # 1 2 3 Average micrograms mass HCN (ug) 58 44 38 47 grams mass HCN (g) 0.00006 0.00004 0.00004 0.00005

Run # 1 2 3 Average V mstd sample volume (dscf) 38.107 39.117 37.891 38.371

sample volume (dscm) 1.079 1.108 1.073 1.087 V wstd moisture volume (dscf) 0.974 0.828 0.970 0.924 B ws measured moisture content (%/100) 0.025 0.021 0.025 0.0 24

saturated moisture content (%/100) 0.092 0.082 0.083 0. 086 actual moisture content (%/100) 0.025 0.021 0.025 0.024 M D molecular weight (dry) 28.82 28.83 28.83 28.83 M A molecular weight (actual) 28.55 28.60 28.56 28.57 V S gas velocity (ft/sec) 28.7 30.0 29.5 29.4 F ACFM gas flow (acfm) 2,114 2,208 2,173 2,165 F DSCFM gas flow (dscfm) 1,583 1,671 1,636 1,630 lb/hr gas flow (lb/hr) 7,211 7,594 7,457 7,421 % % isokinetic 102.4 99.6 98.5 100.2

lb/hr HCN (lb/hr) 0.0003 0.0002 0.0002 0.0003 ppmvd HCN (ppmvd) 0.05 0.04 0.03 0.04 Field Reference Method Data

Laboratory Data

Reference Method CalculationsPage 1 of 3 Thu, 11/19/09 12:23 PM 

### ANALYTICAL REPORT

Paul Ottenstein Air Pollution Testing, Inc. 12421 W 49th Wheat Ridge, CO 80033 Phone: Fax:
E-mail: (303) 420-5949 (303) 420-5920 amongold@airtest.net Report Date November 19, 2009

Project Manager Frank Smith Workorder: 9320042 Purchase Order: Client Project ID: Air Pollution Testing 111609

BAR 9395

Analytical Results 11/11/2009 11/16/2009 9320042001 Sample ID: Lab ID: Media: Collected: Received: 1000 mL Nalgene EW #1 CONT. 3-TB Sampling Location: BAR 9395

Method:
Analyte ug/sample mg/m3 ppm NIOSH 7904 Mod. Analyzed: 11/18/2009 Sampling Parameter: Air Volume Not Provided
RL (ug/sample)

4.0 NA <4.0 NA Hydrogen Cyanide

11/11/2009 11/16/2009 9320042002 Sample ID: Lab ID: Media: Collected: Received: 1000 mL Nalgene EW #1 CONT. 3-1 Sampling Location: BAR 9395

Method:
Analyte ug/sample mg/m3 ppm NIOSH 7904 Mod. Analyzed: 11/18/2009 Sampling Parameter: Air Volume Not Provided
RL (ug/sample)

4.3 NA 140 NA Hydrogen Cyanide

11/12/2009 11/16/2009 9320042003 Sample ID: Lab ID: Media: Collected: Received: 1000 mL Nalgene EW #1 CONT. 3-2 Sampling Location: BAR 9395

Method:
Analyte ug/sample mg/m3 ppm NIOSH 7904 Mod. Analyzed: 11/18/2009 Sampling Parameter: Air Volume Not Provided
RL (ug/sample)

4.1 NA 54 NA Hydrogen Cyanide

11/12/2009 11/16/2009 9320042004 Sample ID: Lab ID: Media: Collected: Received: 1000 mL Nalgene EW #1 CONT. 3-3 Sampling Location: BAR 9395

Method:
Analyte ug/sample mg/m3 ppm NIOSH 7904 Mod. Analyzed: 11/18/2009 Sampling Parameter: Air Volume Not Provided
RL (ug/sample)

4.0 NA 120 NA Hydrogen Cyanide

IHREP-V9.7Page 2 of 3 Thu, 11/19/09 12:23 PM 

### ANALYTICAL REPORT

Project Manager Frank Smith Workorder: 9320042 Purchase Order: Client Project ID: Air Pollution Testing 111609

BAR 9395

Analytical Results 11/12/2009 11/16/2009 9320042005 Sample ID: Lab ID: Media: Collected: Received: 1000 mL Nalgene EW #2 CONT. 3-TB Sampling Location: BAR 9395

Method:
Analyte ug/sample mg/m3 ppm NIOSH 7904 Mod. Analyzed: 11/18/2009 Sampling Parameter: Air Volume Not Provided
RL (ug/sample)

4.0 NA <4.0 NA Hydrogen Cyanide

11/12/2009 11/16/2009 9320042006 Sample ID: Lab ID: Media: Collected: Received: 1000 mL Nalgene EW #2 CONT. 3-1 Sampling Location: BAR 9395

Method:
Analyte ug/sample mg/m3 ppm NIOSH 7904 Mod. Analyzed: 11/18/2009 Sampling Parameter: Air Volume Not Provided
RL (ug/sample)

4.0 NA 58 NA Hydrogen Cyanide

11/12/2009 11/16/2009 9320042007 Sample ID: Lab ID: Media: Collected: Received: 1000 mL Nalgene EW #2 CONT. 3-2 Sampling Location: BAR 9395

Method:
Analyte ug/sample mg/m3 ppm NIOSH 7904 Mod. Analyzed: 11/18/2009 Sampling Parameter: Air Volume Not Provided
RL (ug/sample)

4.2 NA 44 NA Hydrogen Cyanide

11/12/2009 11/16/2009 9320042008 Sample ID: Lab ID: Media: Collected: Received: 1000 mL Nalgene EW #2 CONT. 3-3 Sampling Location: BAR 9395

Method:
Analyte ug/sample mg/m3 ppm NIOSH 7904 Mod. Analyzed: 11/18/2009 Sampling Parameter: Air Volume Not Provided
RL (ug/sample)

4.1 NA 38 NA Hydrogen Cyanide

11/11/2009 11/16/2009 9320042009 Sample ID: Lab ID: Media: Collected: Received: 1000 mL Nalgene .1N REAGENT-RB Sampling Location: BAR 9395

Method:
Analyte ug/sample mg/m3 ppm NIOSH 7904 Mod. Analyzed: 11/18/2009 Sampling Parameter: Air Volume Not Provided
RL (ug/sample)

1.0 NA <1.0 NA Hydrogen Cyanide Workorder Comments

9320042 Impinger volumes are as follows: 9320042001 = 399mL ; 9320042002 = 425mL; 9320042003 =

411mL; 9320042004 = 395mL; 9320042005 = 397mL; 9320 042006 = 396mL; 9320042007 = 421mL; 9320042008 = 407mL; 9320042009 = 100mL.

IHREP-V9.7Page 3 of 3 Thu, 11/19/09 12:23 PM 

### ANALYTICAL REPORT

Project Manager Frank Smith Workorder: 9320042 Purchase Order: Client Project ID: Air Pollution Testing 111609

BAR 9395

Report Authorization

Method: NIOSH 7904 Mod.

Sarah E. Adamson Rosemary Hanks Analyst Peer Review

LOD = Limit of Detection = MDL = Method Detection L imit, A statistical estimate of method/media/instru ment sensitivity. LOQ = Limit of Quantitation = RL = Reporting Limit, A verified value of method/media/instrument sensit ivity. ND = Not Detected, Testing result not detected abov e the LOD or LOQ. ** No result could be reported, see sample comments for details. < This testing result is less than the numerical va lue. ( ) This testing result is between the LOD and LOQ and has higher analytical uncertainty than values a t or above the LOQ. Definitions

The results provided in this report relate only to the items tested. Samples were received in acceptable condition unles s otherwise noted. Samples have not been blank corrected unless otherw ise noted. This test report shall not be reproduced, except in full, without written approval of ALS Laboratory G roup. General Lab Comments

ALS Laboratory Group is accredited by AIHA for spec ific fields of testing as documented in its current scope of accreditation (ID#101574) which is available on request by contac ting your project manager or view on the internet a t http://www.aiha.org. The quality systems implemented in the laboratory apply to all methods performed by ALS Laboratory Group r egardless of this current scope of accreditation which does not include perfo rmance based methods, modified methods, and methods applied to matrices not listed in the methods.
ALS DataChem provides professional analytical servi ces for all samples submitted. ALS Laboratory Grou p is not in a position to interpret the data and assumes no responsibility fo r the quality of the samples submitted.

Phone: (801) 266-7700 Email: lab@datachem.com Web: www.datachem.com Laboratory Contact Information ALS Laboratory Group (formerly DataChem Laboratorie s, Inc.) 960 W Levoy Drive Salt Lake City, Utah 84123

IHREP-V9.7