Technical Memorandum

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1 Technical Memorandum To: Kathy Arnold From: David Levy Tucson Office 3031 West Ina Road Tucson, AZ Tel Fax Company: Rosemont Copper Company Date: January 26, 2010 Re: Rosemont Site Surface Soils Geochemistry Doc #: 030/ CC: David Krizek, P.E. (Tetra Tech) 1.0 Introduction This technical memorandum presents an assessment of the potential for leaching of pollutants from surface soils from seepage generated from the Dry Stack Tailings Facility or Waste Rock Storage Area associated with the proposed Rosemont Copper Project (Project). It is provided in response to the Arizona Department of Environmental Quality (ADEQ) Initial Hydrology Review Letter dated October 8, 2009, which identified 13 Technical Deficiencies requiring a response necessary to complete the review of the Rosemont Aquifer Protection Permit Application (Tetra Tech, 2009a). This technical memorandum directly responds to Technical Deficiency Item 8b 1 in the letter, which is provided in Attachment 1. The data used in this analysis includes baseline chemical analyses for 27 soil samples collected from nine (9) locations, ranging in depth from the surface (0 to 6 inches) down to a depth of 60 inches. The sample locations lie within or at the boundary of the estimated footprint for the Dry Stack Tailings Facility or Waste Rock Storage Area. Additionally, three (3) soil samples were derived from the alluvium and colluvium which overlie the Gila Conglomerate. These samples were tested using the U.S. EPA Method 1312 Synthetic Precipitation Leach Procedure (SPLP) to examine the potential for pollutant release from the native site soils (USEPA, 1986). 2.0 Bulk Soil Chemical and Physical Properties The nine (9) locations from which surface and subsurface samples were collected are shown on the Project site topsoil resource inventory map (Figure 1). The soils were primarily formed in alluvium or colluvium which overlies the Gila Conglomerate. The soil samples were analyzed for bulk soil chemical and physical properties, including texture (percent sand, silt, clay), nutrient content (organic matter, nitrogen, phosphorus), cation exchange capacity (CEC), and acid-base potential (ABP). Saturation paste extracts were also evaluated for ph, electrical conductivity (EC), and sodium adsorption ratio (SAR). The analytical laboratory reports for these analyses are provided in Attachment 2. In summary, the soils are mainly coarse-textured and exhibit chemical characteristics which are predominantly acid-neutralizing, as indicated by mostly positive or only slightly negative ABP values (average ABP = 76.2 T CaCO 3 /kt). The ABP range (-1.6 to 170 T CaCO 3 /kt) indicates an absence of significant mineralization in the soils which presumably should also contain low reactive metals concentrations. The nutrient and organic matter content of the soils are typical of shallow alluvial soils formed in an arid environment, and the values for ph, EC, and SAR indicate that the soils are classified as normal with respect to their salinity status (Brady, 1990). 1 Technical Deficiency Item 8b Submit the results of studies and modeling efforts to address the following components of the hydrologic study required in rule: R18-9-A202(A)(8)(b)(viii) An assessment of potential of the discharge to cause the leaching of pollutants from surface soils or vadose materials.

2 3.0 Soil Leaching Characteristics As a component of the Rosemont baseline geochemical characterization, three (3) soil samples were extracted using the SPLP to evaluate the potential for leaching of pollutants from the soils (Figure 1). Two (2) of the samples ( and AR ) were collected from the southeast portion of the proposed Open Pit footprint and consisted of alluvium and colluvium with similar characteristics to soils found within the proposed Waste Rock Storage Area footprint. A third sample (UAGH-GILA-01) was collected from the northeast portion of the proposed Waste Rock Storage Area. The analytical laboratory reports for this analysis are provided in Attachment 3. The results of the SPLP extractions are given in Table 1. One (1) of the samples ( ) contained naturally-occurring mercury which exceeded the AWQS standard of mg/l in the SPLP extract. Two (2) samples ( and AR ) contained naturally-occurring arsenic above the proposed AWQS of 0.01 mg/l in the SPLP extract; however, one (1) sample ( ) was below and one (1) sample (AR ) was above the current AWQS standard of 0.05 mg/l. Neither mercury nor arsenic were above the AWQS standard in the SPLP extract from the third sample (UAGH-GILA-01). The SPLP ph values also exceeded the upper AWQS standard (ph = 9.0) in the two (2) samples ( and AR ) reported. The remaining extractable metals concentrations were low, with beryllium, cadmium, chromium, copper, nickel, selenium, silver, thallium, and zinc present only at or below the reported detection limit concentrations (Table 1). Table 1. SPLP results (mg/l) for Rosemont Soil Samples Parameter Sample ID AR UAGH-GILA-01 AWQS Standard 1 Aluminum Antimony < < Arsenic Barium < Beryllium <0.002 <0.002 < Cadmium <0.002 <0.002 < Calcium Chloride < Chromium <0.006 <0.006 < Copper <0.01 < Fluoride Iron < Lead < < Magnesium Manganese 0.04 < Mercury < < Molybdenum 0.02 < Nickel <0.01 <0.01 < ph not reported 5 9 Potassium < Selenium <0.04 <0.04 < Silver <0.005 <0.005 < Sodium Sulfate Thallium <0.001 <0.001 < Uranium < not measured Zinc 0.01 < < Arizona Administrative Code Aquifer Water Quality Standard for drinking water protected use. 2 Shaded value exceeds Standard value. 3 The proposed AWQS for arsenic is 0.01 mg/l. The current AWQS for arsenic is 0.05 mg/l. 2

3 4.0 Conclusions The SPLP is designed to simulate the release of constituents from soils when subjected to natural precipitation, and uses an acidic extraction solution composed of nitric and sulfuric acid (ph = 5.0). The SPLP solution is therefore a more potentially-aggressive extraction compared to actual tailings fluid or waste rock seepage which might interact with soils at the Project site. The Rosemont tailings and waste rock are non-acidic by nature, as previously demonstrated by the near-neutral ph conditions associated with their leaching characteristics (Tetra Tech, 2007; Tetra Tech, 2009b). Regardless, arsenic and mercury, which are naturally-occurring in the soils, are sometimes present in laboratory extractions designed to simulate natural precipitation. Soils located in the vicinity of the proposed Open Pit have the potential to release higher concentrations of certain constituents (e.g., arsenic, iron, and sulfate), when compared to soils from the proposed Dry Stack Tailings Facility and Waste Rock Storage Area, due to natural mineralization present in the pit area. However, under actual field conditions, the leachate will be subject to additional natural dilution, dispersion, and attenuation processes, and therefore, it is unlikely that seepage from the Rosemont tailings or waste rock facilities will cause additional significant release of pollutants from Project site soils. REFERENCES Brady, N.C. (1990). The Nature and Properties of Soils. Macmillan Publishing Company, New York. 621 pp. Tetra Tech. (2007). Baseline Geochemical Characterization, Revision 1. Prepared for Augusta Resource Corporation. Report dated September Tetra Tech, Inc. (2009a). Aquifer Protection Permit Application. Prepared for Rosemont Copper Company. Report dated February Tetra Tech, Inc. (2009b). Tailings Geochemistry. Technical Memorandum from Mark Williamson (Tetra Tech, Inc.) to Jamie Sturgess (Rosemont Copper). Dated March 18, U.S. Environmental Protection Agency (USEPA) (1986). Test methods for Evaluating Solid Wastes. 3rd Edition. SW-846. U.S. Environmental Protection Agency, Office of Solid Waste and Emergency Response, Washington, D.C. 3

4 FIGURE

6 ATTACHMENT 1 ADEQ INITIAL HYDROLOGY REVIEW LETTER

13 ATTACHMENT 2 ANALYTICAL LABORATORY REPORTS FOR SOIL CHEMICAL AND PHYSICAL PROPERTIES

59 ATTACHMENT 3 ANALYTICAL LABORATORY REPORTS FOR SPLP SOIL EXTRACTION

60 One Government Gulch - PO Box 929 Kellogg ID (208) Fax (208) Tetra Tech EM, Inc. (Tucson) 3031 West Ina Road Tucson, AZ Project Name: Rosemont Work Order: W9F0593 Reported: 09-Jul-09 15:27 ANALYTICAL REPORT FOR SAMPLES Sample ID Laboratory ID Matrix Date Sampled Sampled By Date Received W9F Soil 22-Jun-09 12:00 JJ AR W9F Soil 22-Jun-09 12:00 JJ 24-Jun Jun-2009 Solid samples are analyzed on an as-received, wet-weight basis, unless otherwise requested. Sample preparation is defined by the client as per their Data Quality Objectives. This report supercedes any previous reports for this Work Order. The complete report includes pages for each sample, a full QC report, and a notes section. The results presented in this report relate only to the samples, and meet all requirements of the NELAC Standards unless otherwise noted. SVL holds the following certifications: AZ:0538, CA:2080, CO:ID00019, FL(NELAC):E87993, ID:ID00019 & ID00965 (Microbiology), NV:ID A, WA:1268, WY:ID00019 Work order Report Page 1 of 11

61 One Government Gulch - PO Box 929 Kellogg ID (208) Fax (208) Tetra Tech EM, Inc. (Tucson) 3031 West Ina Road Tucson, AZ Project Name: Rosemont Work Order: W9F0593 Reported: 09-Jul-09 15:27 Method Client Sample ID: Sampled: 22-Jun-09 12:00 Received: 24-Jun-09 SVL Sample ID: W9F (Soil) Sample Report Page 1 of 2 Sampled By: JJ Analyte Result Units RL MDL Dilution Batch Analyst Analyzed Notes Acid/Base Accounting & Sulfur Forms Modified Sobek ABA 4.0 TCaCO3/kT 0.3 N/A KC 07/06/09 13:30 Modified Sobek AGP 0.5 TCaCO3/kT 0.3 N/A KC 07/01/09 14:30 Modified Sobek ANP 4.5 TCaCO3/kT W KC 07/06/09 13:30 Modified Sobek Non-extractable Sulfur 0.02 % 0.01 W KC 07/01/09 14:30 Modified Sobek Non-Sulfate Sulfur 0.04 % 0.01 W KC 07/01/09 14:30 Modified Sobek Pyritic Sulfur 0.02 % 0.01 N/A KC 07/01/09 14:30 Modified Sobek Sulfate Sulfur 0.04 % 0.01 N/A KC 07/01/09 14:30 Modified Sobek Total Sulfur 0.08 % 0.01 W KC 07/01/09 14:30 Meteoric Water Mobility Extraction Parameters ASTM E Extraction Fluid ph 5.87 ph Units W ESB 07/01/09 14:30 ASTM E Extraction Time 24.0 Hrs W ESB 07/01/09 14:30 ASTM E Extraction Type Rotation W ESB 07/01/09 14:30 ASTM E Feed Moisture % W ESB 07/01/09 14:30 ASTM E Final Fluid ph 8.50 ph Units W ESB 07/01/09 14:30 ASTM E Retained Moisture 0.00 % W ESB 07/01/09 14:30 ASTM E Sample Weight 5000 g W ESB 07/01/09 14:30 Meteoric Water Mobility Leachates (Metals by 200 Series) EPA Aluminum mg/l Extract W DG 07/02/09 12:09 EPA Barium mg/l Extract W DG 07/02/09 12:11 EPA Beryllium < mg/l Extract W DG 07/02/09 12:09 EPA Cadmium < mg/l Extract W DG 07/02/09 12:11 EPA Calcium 20.0 mg/l Extract W DG 07/02/09 12:09 EPA Chromium < mg/l Extract W DG 07/02/09 12:11 EPA Copper < mg/l Extract W DG 07/02/09 12:11 EPA Iron mg/l Extract W DG 07/02/09 12:09 EPA Lead < mg/l Extract W DG 07/02/09 12:11 EPA Magnesium 3.62 mg/l Extract W DG 07/02/09 12:09 EPA Manganese mg/l Extract W DG 07/02/09 12:09 EPA Molybdenum mg/l Extract W DG 07/02/09 12:11 EPA Nickel < mg/l Extract W DG 07/02/09 12:11 EPA Potassium 17.8 mg/l Extract W DG 07/02/09 12:09 EPA Selenium < mg/l Extract W DG 07/02/09 12:11 EPA Silver < mg/l Extract W DG 07/02/09 12:11 EPA Sodium 24.7 mg/l Extract W DG 07/02/09 12:09 EPA Zinc < mg/l Extract W DG 07/02/09 12:11 EPA Antimony mg/l Extract W KWH 07/08/09 11:48 EPA Arsenic mg/l Extract W KWH 07/08/09 11:48 EPA Thallium < mg/l Extract W KWH 07/08/09 11:48 EPA Uranium mg/l Extract W KWH 07/08/09 11:48 EPA Mercury mg/l Extract W JAA 07/06/09 12:55 Meteoric Water Mobility Leachates (Classical) SM 2540C Total Diss. Solids 240 mg/l Extract W AGF 07/01/09 15:15 SM 4500 H B ph C ph Units W DKS 07/02/09 10:21 Meteoric Water Mobility Leachates (Anions) EPA Chloride 1.88 mg/l Extract W EML 07/07/09 21:47 EPA Fluoride mg/l Extract W EML 07/07/09 21:47 EPA Sulfate as SO mg/l Extract W EML 07/07/09 21:47 SPLP Extraction Parameters ASTM E Final Fluid ph 9.26 ph Units W ESB 07/02/09 14:00 SVL holds the following certifications: AZ:0538, CA:2080, CO:ID00019, FL(NELAC):E87993, ID:ID00019 & ID00965 (Microbiology), NV:ID A, WA:1268, WY:ID00019 Work order Report Page 2 of 11

62 One Government Gulch - PO Box 929 Kellogg ID (208) Fax (208) Tetra Tech EM, Inc. (Tucson) 3031 West Ina Road Tucson, AZ Project Name: Rosemont Work Order: W9F0593 Reported: 09-Jul-09 15:27 Method Client Sample ID: Sampled: 22-Jun-09 12:00 Received: 24-Jun-09 SVL Sample ID: W9F (Soil) Sample Report Page 2 of 2 Sampled By: JJ Analyte Result Units RL MDL Dilution Batch Analyst Analyzed Notes SPLP Leachates (Metals) EPA 6010B Aluminum 0.7 mg/l Extract W DT 07/07/09 12:12 EPA 6010B Barium 0.01 mg/l Extract W DT 07/07/09 12:14 EPA 6010B Beryllium < mg/l Extract W DT 07/07/09 12:12 EPA 6010B Cadmium < mg/l Extract W DT 07/07/09 12:14 EPA 6010B Calcium 4.8 mg/l Extract W DT 07/07/09 12:12 EPA 6010B Chromium < mg/l Extract W DT 07/07/09 12:14 EPA 6010B Copper < 0.01 mg/l Extract W DT 07/07/09 12:13 EPA 6010B Iron 0.4 mg/l Extract W DT 07/07/09 12:12 EPA 6010B Lead mg/l Extract W DT 07/07/09 12:14 EPA 6010B Magnesium 0.8 mg/l Extract W DT 07/07/09 12:12 EPA 6010B Manganese 0.04 mg/l Extract W DT 07/07/09 12:12 EPA 6010B Molybdenum 0.02 mg/l Extract W DT 07/07/09 12:14 EPA 6010B Nickel < 0.01 mg/l Extract W DT 07/07/09 12:14 EPA 6010B Potassium 2.50 mg/l Extract W DT 07/07/09 12:12 EPA 6010B Selenium < mg/l Extract W DT 07/07/09 12:14 EPA 6010B Silver < mg/l Extract W DT 07/07/09 12:13 EPA 6010B Sodium 6.1 mg/l Extract W DT 07/07/09 12:12 EPA 6010B Zinc 0.01 mg/l Extract W DT 07/07/09 12:14 EPA 6020 Antimony < mg/l Extract W KWH 07/09/09 12:51 EPA 6020 Arsenic mg/l Extract W KWH 07/09/09 12:51 EPA 6020 Thallium < mg/l Extract W KWH 07/09/09 12:51 EPA 6020 Uranium < mg/l Extract W KWH 07/09/09 12:51 EPA 7470A Mercury mg/l Extract W JAA 07/06/09 14:24 D2 SPLP Leachates (Classical) SM 2540 C Total Diss. Solids 41 mg/l Extract W AGF 07/06/09 12:25 SM 4500 H B ph C ph Units W DKS 07/06/09 11:29 SPLP Leachates (Anions) EPA Chloride mg/l Extract W EML 07/07/09 17:43 EPA Fluoride mg/l Extract W EML 07/07/09 17:43 EPA Sulfate as SO mg/l Extract W EML 07/07/09 17:43 This data has been reviewed for accuracy and has been authorized for release by the Laboratory Director or designee. John Kern Laboratory Director SVL holds the following certifications: AZ:0538, CA:2080, CO:ID00019, FL(NELAC):E87993, ID:ID00019 & ID00965 (Microbiology), NV:ID A, WA:1268, WY:ID00019 Work order Report Page 3 of 11

63 One Government Gulch - PO Box 929 Kellogg ID (208) Fax (208) Tetra Tech EM, Inc. (Tucson) 3031 West Ina Road Tucson, AZ Project Name: Rosemont Work Order: W9F0593 Reported: 09-Jul-09 15:27 Method Client Sample ID: AR Sampled: 22-Jun-09 12:00 Received: 24-Jun-09 SVL Sample ID: W9F (Soil) Sample Report Page 1 of 2 Sampled By: JJ Analyte Result Units RL MDL Dilution Batch Analyst Analyzed Notes Acid/Base Accounting & Sulfur Forms Modified Sobek ABA 17.4 TCaCO3/kT 0.3 N/A KC 07/06/09 13:30 Modified Sobek AGP < 0.3 TCaCO3/kT 0.3 N/A KC 07/01/09 14:30 Modified Sobek ANP 17.4 TCaCO3/kT W KC 07/06/09 13:30 Modified Sobek Non-extractable Sulfur < 0.01 % 0.01 W KC 07/01/09 14:30 Modified Sobek Non-Sulfate Sulfur < 0.01 % 0.01 W KC 07/01/09 14:30 Modified Sobek Pyritic Sulfur < 0.01 % 0.01 N/A KC 07/01/09 14:30 Modified Sobek Sulfate Sulfur < 0.01 % 0.01 N/A KC 07/01/09 14:30 Modified Sobek Total Sulfur < 0.01 % 0.01 W KC 07/01/09 14:30 Meteoric Water Mobility Extraction Parameters ASTM E Extraction Fluid ph 5.87 ph Units W ESB 07/01/09 14:30 ASTM E Extraction Time 24.0 Hrs W ESB 07/01/09 14:30 ASTM E Extraction Type Rotation W ESB 07/01/09 14:30 ASTM E Feed Moisture 2.93 % W ESB 07/01/09 14:30 ASTM E Final Fluid ph 8.53 ph Units W ESB 07/01/09 14:30 ASTM E Retained Moisture 0.00 % W ESB 07/01/09 14:30 ASTM E Sample Weight 5000 g W ESB 07/01/09 14:30 Meteoric Water Mobility Leachates (Metals by 200 Series) EPA Aluminum mg/l Extract W DG 07/02/09 12:27 EPA Barium mg/l Extract W DG 07/02/09 12:28 EPA Beryllium < mg/l Extract W DG 07/02/09 12:27 EPA Cadmium < mg/l Extract W DG 07/02/09 12:28 EPA Calcium 16.8 mg/l Extract W DG 07/02/09 12:27 EPA Chromium < mg/l Extract W DG 07/02/09 12:28 EPA Copper < mg/l Extract W DG 07/02/09 12:28 EPA Iron < mg/l Extract W DG 07/02/09 12:27 EPA Lead mg/l Extract W DG 07/02/09 12:28 EPA Magnesium 3.69 mg/l Extract W DG 07/02/09 12:27 EPA Manganese < mg/l Extract W DG 07/02/09 12:27 EPA Molybdenum mg/l Extract W DG 07/02/09 12:28 EPA Nickel < mg/l Extract W DG 07/02/09 12:28 EPA Potassium 5.79 mg/l Extract W DG 07/02/09 12:27 EPA Selenium < mg/l Extract W DG 07/02/09 12:28 EPA Silver < mg/l Extract W DG 07/02/09 12:28 EPA Sodium 22.3 mg/l Extract W DG 07/02/09 12:27 EPA Zinc < mg/l Extract W DG 07/02/09 12:28 EPA Antimony mg/l Extract W KWH 07/08/09 11:52 EPA Arsenic mg/l Extract W KWH 07/08/09 11:52 EPA Thallium < mg/l Extract W KWH 07/08/09 11:52 EPA Uranium mg/l Extract W KWH 07/08/09 11:52 EPA Mercury < mg/l Extract W JAA 07/06/09 13:03 Meteoric Water Mobility Leachates (Classical) SM 2540C Total Diss. Solids 180 mg/l Extract W AGF 07/01/09 15:15 SM 4500 H B ph C ph Units W DKS 07/02/09 10:27 Meteoric Water Mobility Leachates (Anions) EPA Chloride 1.28 mg/l Extract W EML 07/07/09 22:08 EPA Fluoride 1.48 mg/l Extract W EML 07/07/09 22:08 EPA Sulfate as SO mg/l Extract W EML 07/07/09 22:08 SPLP Extraction Parameters ASTM E Final Fluid ph 9.24 ph Units W ESB 07/02/09 14:00 SVL holds the following certifications: AZ:0538, CA:2080, CO:ID00019, FL(NELAC):E87993, ID:ID00019 & ID00965 (Microbiology), NV:ID A, WA:1268, WY:ID00019 Work order Report Page 4 of 11

One Government Gulch - PO Box 929 Kellogg ID 83837-0929 (208) 784-1258 Fax (208) 783-0891 Tetra Tech EM, Inc.

Sample ID: W9F0593-02 (Soil) Sample Report Page 2 of 2 Sampled By: JJ Analyte Result Units RL MDL Dilution Batch Analyst Analyzed Notes SPLP Leachates (Metals) EPA 6010B Aluminum 0.4 mg/l Extract 0.

002 mg/l Extract 0.002 0.0005 W928001 DT 07/07/09 12:29 EPA 6010B Calcium 4.9 mg/l Extract 0.04 0.02 W928001 DT 07/07/09 12:27 EPA 6010B Chromium < 0.006 mg/l Extract 0.006 0.

64 One Government Gulch - PO Box 929 Kellogg ID (208) Fax (208) Tetra Tech EM, Inc. (Tucson) 3031 West Ina Road Tucson, AZ Project Name: Rosemont Work Order: W9F0593 Reported: 09-Jul-09 15:27 Method Client Sample ID: AR Sampled: 22-Jun-09 12:00 Received: 24-Jun-09 SVL Sample ID: W9F (Soil) Sample Report Page 2 of 2 Sampled By: JJ Analyte Result Units RL MDL Dilution Batch Analyst Analyzed Notes SPLP Leachates (Metals) EPA 6010B Aluminum 0.4 mg/l Extract W DT 07/07/09 12:28 EPA 6010B Barium mg/l Extract W DT 07/07/09 12:29 EPA 6010B Beryllium < mg/l Extract W DT 07/07/09 12:28 EPA 6010B Cadmium < mg/l Extract W DT 07/07/09 12:29 EPA 6010B Calcium 4.9 mg/l Extract W DT 07/07/09 12:27 EPA 6010B Chromium < mg/l Extract W DT 07/07/09 12:29 EPA 6010B Copper < 0.01 mg/l Extract W DT 07/07/09 12:29 EPA 6010B Iron 0.3 mg/l Extract W DT 07/07/09 12:28 EPA 6010B Lead < mg/l Extract W DT 07/07/09 12:29 EPA 6010B Magnesium 1.1 mg/l Extract W DT 07/07/09 12:28 EPA 6010B Manganese < mg/l Extract W DT 07/07/09 12:28 EPA 6010B Molybdenum < mg/l Extract W DT 07/07/09 12:29 EPA 6010B Nickel < 0.01 mg/l Extract W DT 07/07/09 12:29 EPA 6010B Potassium 1.76 mg/l Extract W DT 07/07/09 12:27 EPA 6010B Selenium < mg/l Extract W DT 07/07/09 12:29 EPA 6010B Silver < mg/l Extract W DT 07/07/09 12:29 EPA 6010B Sodium 8.4 mg/l Extract W DT 07/07/09 12:27 EPA 6010B Zinc < 0.01 mg/l Extract W DT 07/07/09 12:29 EPA 6020 Antimony < mg/l Extract W KWH 07/09/09 12:53 EPA 6020 Arsenic mg/l Extract W KWH 07/09/09 12:53 EPA 6020 Thallium < mg/l Extract W KWH 07/09/09 12:53 EPA 6020 Uranium < mg/l Extract W KWH 07/09/09 12:53 EPA 7470A Mercury < mg/l Extract W JAA 07/06/09 13:13 SPLP Leachates (Classical) SM 2540 C Total Diss. Solids 43 mg/l Extract W AGF 07/06/09 12:25 SM 4500 H B ph C ph Units W DKS 07/06/09 11:34 SPLP Leachates (Anions) EPA Chloride mg/l Extract W EML 07/07/09 18:12 EPA Fluoride mg/l Extract W EML 07/07/09 18:12 This data has been reviewed for accuracy and has been authorized for release by the Laboratory Director or designee. John Kern Laboratory Director SVL holds the following certifications: AZ:0538, CA:2080, CO:ID00019, FL(NELAC):E87993, ID:ID00019 & ID00965 (Microbiology), NV:ID A, WA:1268, WY:ID00019 Work order Report Page 5 of 11

65 One Government Gulch - PO Box 929 Kellogg ID (208) Fax (208) Tetra Tech EM, Inc. (Tucson) 3031 West Ina Road Tucson, AZ Project Name: Rosemont Work Order: W9F0593 Reported: 09-Jul-09 15:27 Quality Control - BLANK Data Method Analyte Units Result MDL MRL Batch ID Analyzed Notes Acid/Base Accounting & Sulfur Forms Modified Sobek ANP TCaCO3/kT < W Jul-09 Modified Sobek Non-Sulfate Sulfur % < W Jul-09 Modified Sobek Total Sulfur % < W Jul-09 Modified Sobek Non-extractable Sulfur % < W Jul-09 Meteoric Water Mobility Leachates (Metals by 200 Series) EPA Aluminum mg/l Extract < W Jul-09 EPA Barium mg/l Extract < W Jul-09 EPA Beryllium mg/l Extract < W Jul-09 EPA Cadmium mg/l Extract < W Jul-09 EPA Calcium mg/l Extract < W Jul-09 EPA Chromium mg/l Extract < W Jul-09 EPA Copper mg/l Extract < W Jul-09 EPA Iron mg/l Extract < W Jul-09 EPA Lead mg/l Extract < W Jul-09 EPA Magnesium mg/l Extract < W Jul-09 EPA Manganese mg/l Extract < W Jul-09 EPA Molybdenum mg/l Extract < W Jul-09 EPA Nickel mg/l Extract < W Jul-09 EPA Potassium mg/l Extract < W Jul-09 EPA Selenium mg/l Extract < W Jul-09 EPA Silver mg/l Extract < W Jul-09 EPA Sodium mg/l Extract < W Jul-09 EPA Zinc mg/l Extract < W Jul-09 EPA Antimony mg/l Extract < W Jul-09 EPA Arsenic mg/l Extract < W Jul-09 EPA Thallium mg/l Extract < W Jul-09 EPA Uranium mg/l Extract < W Jul-09 EPA Mercury mg/l Extract < W Jul-09 Meteoric Water Mobility Leachates (Anions) EPA Fluoride mg/l Extract < W Jul-09 EPA Chloride mg/l Extract < W Jul-09 EPA Sulfate as SO4 mg/l Extract < W Jul-09 SPLP Leachates (Metals) EPA 6010B Aluminum mg/l Extract < W Jul-09 EPA 6010B Barium mg/l Extract < W Jul-09 EPA 6010B Beryllium mg/l Extract < W Jul-09 EPA 6010B Cadmium mg/l Extract < W Jul-09 EPA 6010B Calcium mg/l Extract < W Jul-09 B7 EPA 6010B Chromium mg/l Extract < W Jul-09 EPA 6010B Copper mg/l Extract < W Jul-09 EPA 6010B Iron mg/l Extract < W Jul-09 EPA 6010B Lead mg/l Extract < W Jul-09 EPA 6010B Magnesium mg/l Extract < W Jul-09 EPA 6010B Manganese mg/l Extract < W Jul-09 EPA 6010B Molybdenum mg/l Extract < W Jul-09 EPA 6010B Nickel mg/l Extract < W Jul-09 EPA 6010B Potassium mg/l Extract < W Jul-09 EPA 6010B Selenium mg/l Extract < W Jul-09 EPA 6010B Silver mg/l Extract < W Jul-09 EPA 6010B Sodium mg/l Extract < W Jul-09 EPA 6010B Zinc mg/l Extract < W Jul-09 EPA 6020 Antimony mg/l Extract < W Jul-09 EPA 6020 Arsenic mg/l Extract < W Jul-09 SVL holds the following certifications: AZ:0538, CA:2080, CO:ID00019, FL(NELAC):E87993, ID:ID00019 & ID00965 (Microbiology), NV:ID A, WA:1268, WY:ID00019 Work order Report Page 6 of 11

66 One Government Gulch - PO Box 929 Kellogg ID (208) Fax (208) Tetra Tech EM, Inc. (Tucson) 3031 West Ina Road Tucson, AZ Project Name: Rosemont Work Order: W9F0593 Reported: 09-Jul-09 15:27 Quality Control - BLANK Data (Continued) Method Analyte Units Result MDL MRL Batch ID Analyzed Notes SPLP Leachates (Metals) (Continued) EPA 6020 Thallium mg/l Extract < W Jul-09 EPA 6020 Uranium mg/l Extract < W Jul-09 EPA 7470A Mercury mg/l Extract < W Jul-09 SPLP Leachates (Anions) EPA Fluoride mg/l Extract < W Jul-09 EPA Chloride mg/l Extract < W Jul-09 EPA Sulfate as SO4 mg/l Extract < W Jul-09 Quality Control - LABORATORY CONTROL SAMPLE Data LCS LCS % Acceptance Method Analyte Units Result True Rec. Limits Batch ID Analyzed Notes Acid/Base Accounting & Sulfur Forms Modified Sobek ANP TCaCO3/kT Modified Sobek Total Sulfur % W W Jul Jul-09 Meteoric Water Mobility Leachates (Metals by 200 Series) EPA Aluminum mg/l Extract EPA Barium mg/l Extract EPA Beryllium mg/l Extract EPA Cadmium mg/l Extract EPA Calcium mg/l Extract EPA Chromium mg/l Extract EPA Copper mg/l Extract EPA Iron mg/l Extract EPA Lead mg/l Extract EPA Magnesium mg/l Extract EPA Manganese mg/l Extract EPA Molybdenum mg/l Extract EPA Nickel mg/l Extract EPA Potassium mg/l Extract EPA Selenium mg/l Extract EPA Silver mg/l Extract EPA Sodium mg/l Extract EPA Zinc mg/l Extract EPA Antimony mg/l Extract EPA Arsenic mg/l Extract EPA Thallium mg/l Extract EPA Uranium mg/l Extract EPA Mercury mg/l Extract W W W W W W W W W W W W W W W W W W W W W W W Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul-09 Meteoric Water Mobility Leachates (Anions) EPA Fluoride mg/l Extract EPA Chloride mg/l Extract EPA Sulfate as SO4 mg/l Extract W W W Jul Jul Jul-09 SPLP Leachates (Metals) EPA 6010B Aluminum EPA 6010B Barium EPA 6010B Beryllium EPA 6010B Cadmium EPA 6010B Calcium EPA 6010B Chromium EPA 6010B Copper mg/l Extract mg/l Extract mg/l Extract mg/l Extract mg/l Extract mg/l Extract mg/l Extract W W W W W W W Jul Jul Jul Jul Jul Jul Jul-09 SVL holds the following certifications: AZ:0538, CA:2080, CO:ID00019, FL(NELAC):E87993, ID:ID00019 & ID00965 (Microbiology), NV:ID A, WA:1268, WY:ID00019 Work order Report Page 7 of 11

67 One Government Gulch - PO Box 929 Kellogg ID (208) Fax (208) Tetra Tech EM, Inc. (Tucson) 3031 West Ina Road Tucson, AZ Project Name: Rosemont Work Order: W9F0593 Reported: 09-Jul-09 15:27 Quality Control - LABORATORY CONTROL SAMPLE Data (Continued) LCS LCS % Acceptance Method Analyte Units Result True Rec. Limits Batch ID Analyzed Notes SPLP Leachates (Metals) (Continued) EPA 6010B Iron mg/l Extract EPA 6010B Lead mg/l Extract EPA 6010B Magnesium mg/l Extract EPA 6010B Manganese mg/l Extract EPA 6010B Molybdenum mg/l Extract EPA 6010B Nickel mg/l Extract EPA 6010B Potassium mg/l Extract EPA 6010B Selenium mg/l Extract EPA 6010B Silver mg/l Extract EPA 6010B Sodium mg/l Extract EPA 6010B Zinc mg/l Extract EPA 6020 Antimony mg/l Extract EPA 6020 Arsenic mg/l Extract EPA 6020 Thallium mg/l Extract EPA 6020 Uranium mg/l Extract EPA 7470A Mercury mg/l Extract W W W W W W W W W W W W W W W W Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul-09 SPLP Leachates (Anions) EPA Fluoride EPA Chloride EPA Sulfate as SO4 mg/l Extract mg/l Extract mg/l Extract W W W Jul Jul Jul-09 Quality Control - DUPLICATE Data Method Analyte Units Duplicate Result Sample Result RPD RPD Limit Batch ID Analyzed Notes Acid/Base Accounting & Sulfur Forms Modified Sobek ANP TCaCO3/kT W Jul-09 Modified Sobek Non-Sulfate Sulfur % W Jul-09 Modified Sobek Total Sulfur % W Jul-09 Modified Sobek Non-extractable Sulfur % 0.01 <0.01 <RL 20 W Jul-09 Meteoric Water Mobility Leachates (Metals by 200 Series) EPA Aluminum mg/l Extract W Jul-09 EPA Barium mg/l Extract W Jul-09 EPA Beryllium mg/l Extract < < UDL 20 W Jul-09 EPA Cadmium mg/l Extract < < UDL 20 W Jul-09 EPA Calcium mg/l Extract W Jul-09 EPA Chromium mg/l Extract < < UDL 20 W Jul-09 EPA Copper mg/l Extract <0.010 <0.010 <RL 20 W Jul-09 EPA Iron mg/l Extract W Jul-09 EPA Lead mg/l Extract <0.008 <0.008 UDL 20 W Jul-09 EPA Magnesium mg/l Extract W Jul-09 EPA Manganese mg/l Extract W Jul-09 EPA Molybdenum mg/l Extract W Jul-09 EPA Nickel mg/l Extract <0.010 <0.010 UDL 20 W Jul-09 EPA Potassium mg/l Extract W Jul-09 EPA Selenium mg/l Extract <0.040 <0.040 UDL 20 W Jul-09 EPA Silver mg/l Extract < < UDL 20 W Jul-09 EPA Sodium mg/l Extract W Jul-09 EPA Zinc mg/l Extract < < UDL 20 W Jul-09 EPA Antimony mg/l Extract W Jul-09 EPA Arsenic mg/l Extract W Jul-09 R3 R2 R3 SVL holds the following certifications: AZ:0538, CA:2080, CO:ID00019, FL(NELAC):E87993, ID:ID00019 & ID00965 (Microbiology), NV:ID A, WA:1268, WY:ID00019 Work order Report Page 8 of 11

68 One Government Gulch - PO Box 929 Kellogg ID (208) Fax (208) Tetra Tech EM, Inc. (Tucson) 3031 West Ina Road Tucson, AZ Project Name: Rosemont Work Order: W9F0593 Reported: 09-Jul-09 15:27 Quality Control - DUPLICATE Data (Continued) Method Analyte Units Duplicate Result Sample Result RPD RPD Limit Batch ID Analyzed Notes Meteoric Water Mobility Leachates (Metals by 200 Series) (Continued) EPA Thallium mg/l Extract < < <RL 20 W Jul-09 EPA Uranium mg/l Extract W Jul-09 EPA Mercury mg/l Extract W Jul-09 Meteoric Water Mobility Leachates (Classical) SM 2540C Total Diss. Solids mg/l Extract W Jul-09 SM 4500 H B ph ph Units W Jul-09 Meteoric Water Mobility Leachates (Anions) EPA Fluoride mg/l Extract W Jul-09 EPA Chloride mg/l Extract W Jul-09 EPA Sulfate as SO4 mg/l Extract W Jul-09 SPLP Leachates (Classical) SM 2540 C Total Diss. Solids mg/l Extract W Jul-09 SM 4500 H B ph ph Units W Jul-09 SPLP Leachates (Anions) EPA Fluoride mg/l Extract W Jul-09 EPA Chloride mg/l Extract W Jul-09 EPA Sulfate as SO4 mg/l Extract W Jul-09 Quality Control - MATRIX SPIKE Data Method Analyte Units Spike Result Sample Result (R) Spike Level (S) % Rec. Acceptance Limits Batch ID Analyzed Notes Meteoric Water Mobility Leachates (Metals by 200 Series) EPA Aluminum mg/l Extract EPA Barium mg/l Extract EPA Beryllium mg/l Extract 1.09 < EPA Cadmium mg/l Extract 1.11 < EPA Calcium mg/l Extract EPA Chromium mg/l Extract 1.12 < EPA Copper mg/l Extract 1.17 < EPA Iron mg/l Extract EPA Lead mg/l Extract 1.16 < EPA Magnesium mg/l Extract EPA Manganese mg/l Extract EPA Molybdenum mg/l Extract EPA Nickel mg/l Extract 1.10 < EPA Potassium mg/l Extract EPA Selenium mg/l Extract 1.17 < EPA Silver mg/l Extract < EPA Sodium mg/l Extract EPA Zinc mg/l Extract 1.10 < EPA Antimony mg/l Extract EPA Arsenic mg/l Extract EPA Thallium mg/l Extract < EPA Uranium mg/l Extract EPA Mercury mg/l Extract W W W W W W W W W W W W W W W W W W W W W W W Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul Jul-09 Meteoric Water Mobility Leachates (Anions) EPA Fluoride mg/l Extract W Jul-09 EPA Chloride mg/l Extract W Jul-09 EPA Sulfate as SO4 mg/l Extract W Jul-09 M1 SVL holds the following certifications: AZ:0538, CA:2080, CO:ID00019, FL(NELAC):E87993, ID:ID00019 & ID00965 (Microbiology), NV:ID A, WA:1268, WY:ID00019 Work order Report Page 9 of 11

69 One Government Gulch - PO Box 929 Kellogg ID (208) Fax (208) Tetra Tech EM, Inc. (Tucson) 3031 West Ina Road Tucson, AZ Project Name: Rosemont Work Order: W9F0593 Reported: 09-Jul-09 15:27 Quality Control - MATRIX SPIKE Data (Continued) Method Analyte Units Spike Result Sample Result (R) Spike Level (S) % Rec. Acceptance Limits Batch ID Analyzed Notes SPLP Leachates (Metals) EPA 6010B Aluminum mg/l Extract W Jul-09 EPA 6010B Barium mg/l Extract W Jul-09 EPA 6010B Beryllium mg/l Extract < W Jul-09 EPA 6010B Cadmium mg/l Extract < W Jul-09 EPA 6010B Calcium mg/l Extract W Jul-09 EPA 6010B Chromium mg/l Extract < W Jul-09 EPA 6010B Copper mg/l Extract 1.05 < W Jul-09 EPA 6010B Iron mg/l Extract W Jul-09 EPA 6010B Lead mg/l Extract W Jul-09 EPA 6010B Magnesium mg/l Extract W Jul-09 EPA 6010B Manganese mg/l Extract W Jul-09 EPA 6010B Molybdenum mg/l Extract W Jul-09 EPA 6010B Nickel mg/l Extract 0.95 < W Jul-09 EPA 6010B Potassium mg/l Extract W Jul-09 EPA 6010B Selenium mg/l Extract < W Jul-09 EPA 6010B Silver mg/l Extract < W Jul-09 EPA 6010B Sodium mg/l Extract W Jul-09 EPA 6010B Zinc mg/l Extract W Jul-09 EPA 6020 Antimony mg/l Extract < W Jul-09 EPA 6020 Arsenic mg/l Extract < W Jul-09 EPA 6020 Thallium mg/l Extract < W Jul-09 EPA 6020 Uranium mg/l Extract < W Jul-09 EPA 7470A Mercury mg/l Extract W Jul-09 D2,M3 SPLP Leachates (Anions) EPA Fluoride mg/l Extract W Jul-09 M1 EPA Chloride mg/l Extract W Jul-09 EPA Sulfate as SO4 mg/l Extract W Jul-09 Quality Control - MATRIX SPIKE DUPLICATE Data MSD Spike Spike RPD Method Analyte Units Result Result Level RPD Limit Batch ID Analyzed Notes SPLP Leachates (Metals) EPA 6010B Aluminum mg/l Extract W Jul-09 EPA 6010B Barium mg/l Extract W Jul-09 EPA 6010B Beryllium mg/l Extract W Jul-09 EPA 6010B Cadmium mg/l Extract W Jul-09 EPA 6010B Calcium mg/l Extract W Jul-09 EPA 6010B Chromium mg/l Extract W Jul-09 EPA 6010B Copper mg/l Extract W Jul-09 EPA 6010B Iron mg/l Extract W Jul-09 EPA 6010B Lead mg/l Extract W Jul-09 EPA 6010B Magnesium mg/l Extract W Jul-09 EPA 6010B Manganese mg/l Extract W Jul-09 EPA 6010B Molybdenum mg/l Extract W Jul-09 EPA 6010B Nickel mg/l Extract W Jul-09 EPA 6010B Potassium mg/l Extract W Jul-09 EPA 6010B Selenium mg/l Extract W Jul-09 EPA 6010B Silver mg/l Extract W Jul-09 EPA 6010B Sodium mg/l Extract W Jul-09 EPA 6010B Zinc mg/l Extract W Jul-09 EPA 6020 Antimony mg/l Extract W Jul-09 EPA 6020 Arsenic mg/l Extract W Jul-09 SVL holds the following certifications: AZ:0538, CA:2080, CO:ID00019, FL(NELAC):E87993, ID:ID00019 & ID00965 (Microbiology), NV:ID A, WA:1268, WY:ID00019 Work order Report Page 10 of 11

70 One Government Gulch - PO Box 929 Kellogg ID (208) Fax (208) Tetra Tech EM, Inc. (Tucson) 3031 West Ina Road Tucson, AZ Project Name: Rosemont Work Order: W9F0593 Reported: 09-Jul-09 15:27 Quality Control - MATRIX SPIKE DUPLICATE Data (Continued) MSD Spike Spike RPD Method Analyte Units Result Result Level RPD Limit Batch ID Analyzed Notes SPLP Leachates (Metals) (Continued) EPA 6020 Thallium mg/l Extract W Jul-09 EPA 6020 Uranium mg/l Extract W Jul-09 EPA 7470A Mercury mg/l Extract W Jul-09 D2,M3 Notes and Definitions B7 D2 M1 M3 R2 R3 LCS RPD UDL R > 4S <RL MRL MDL N/A Target analyte in method blank exceeded method QC limits, but concentrations in samples were at least 10x the blank concentration. Sample required dilution due to high concentration of target analyte. Matrix spike recovery was high, but the LCS recovery was acceptable. The spike recovery value is unusable since the analyte concentration in the sample is disproportionate to spike level. The LCS was acceptable. RPD/RSD exceeded the laboratory acceptance limit. There is no control limit for the RPD if the concentration in the sample is less than five times the reporting limit Laboratory Control Sample (Blank Spike) Relative Percent Difference A result is less than the detection limit % recovery not applicable, sample concentration more than four times greater than spike level A result is less than the reporting limit Method Reporting Limit Method Detection Limit Not Applicable SVL holds the following certifications: AZ:0538, CA:2080, CO:ID00019, FL(NELAC):E87993, ID:ID00019 & ID00965 (Microbiology), NV:ID A, WA:1268, WY:ID00019 Work order Report Page 11 of 11

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ATTACHMENT 9. Rosemont Tailing Geochemistry Sample Sources Tetra Tech, August 30, 2010

ATTACHMENT 9. Rosemont Tailing Geochemistry Sample Sources Tetra Tech, August 30, 2010 ADEQ-80 ATTACHMENT 9 Rosemont Tailing Geochemistry Sample Sources Tetra Tech, August 30, 2010 F:\Rosemont APP\August 2010 Response Letter\Sept 7 Tetra Tech-revised Response Letters\Final ADEQ Response