R J Hill Laboratories Limited 28 Duke Street Frankton 3204 Private Bag 3205 Hamilton 3240 New Zealand 0508 HILL LAB (44 555 22) +64 7 858 2000 [email protected] www.hill-laboratories.com T T E W This Laboratory is accredited by International Accreditation New Zealand (IANZ), which represents New Zealand in the International Laboratory Accreditation Cooperation (ILAC). Through the ILAC Mutual Recognition Arrangement (ILAC-MRA) this accreditation is internationally recognised. The tests reported herein have been performed in accordance with the terms of accreditation, with the exception of tests marked * or any comments and interpretations, which are not accredited. Certificate of Analysis Page 1 of 2 Client: Contact: Mark Burroughs C/- Oceana Gold (New Zealand) Limited PO Box 190 Waihi 3610 Oceana Gold (New Zealand) Limited Lab No: Date Received: Date Reported: Quote No: Order No: Client Reference: Submitted By: 2873486 16-Feb-2022 23-Feb-2022 85959 70057893 Extended suite Mark Burroughs SPv1 Sample Type: Aqueous Sample Name: Lab Number: 1839334 15-Feb-2022 10:30 am 1839335 15-Feb-2022 11:10 am 2873486.1 2873486.2 2873486.3 1839336 15-Feb-2022 12:00 pm Individual Tests pH Units 1.9 2.1 2.3 - - pH g/m3 as CaCO3 2,900 5,100 2,800 - - Acidity (pH 3.7) g/m3 as CaCO3 < 1.0 < 1.0 < 1.0 - - Total Alkalinity mS/m 688 844 937 - - Electrical Conductivity (EC) g/m3 95 440 370 - - Dissolved Aluminium g/m3 0.0036 0.013 0.004 - - Dissolved Antimony g/m3 < 0.005 < 0.005 0.009 - - Dissolved Barium g/m3 21 350 440 - - Dissolved Calcium g/m3 0.21 1.52 2.7 - - Dissolved Cobalt g/m3 960 1,990 1,390 - - Dissolved Iron g/m3 11.1 144 480 - - Dissolved Magnesium g/m3 3.5 60 16.0 - - Dissolved Manganese g/m3 < 0.00015 < 0.0003 < 0.00015 - - Dissolved Mercury g/m3 0.0157 0.016 0.016 - - Dissolved Molybdenum g/m3 1.5 < 0.5 48 - - Dissolved Potassium g/m3 0.011 0.020 0.018 - - Dissolved Selenium g/m3 < 0.0005 0.0035 < 0.0010 - - Dissolved Silver g/m3 1.58 2.1 18.7 - - Dissolved Sodium g/m3 0.045 0.156 2.5 - - Dissolved Strontium g/m3 0.0155 0.095 0.197 - - Dissolved Uranium g/m3 0.109 0.73 0.76 - - Dissolved Vanadium g/m3 3,400 9,500 10,200 - - Sulphate Heavy metals, dissolved, trace As,Cd,Cr,Cu,Ni,Pb,Zn g/m3 35 83 31 - - Dissolved Arsenic g/m3 0.0033 0.026 0.0164 - - Dissolved Cadmium g/m3 0.22 0.59 0.36 - - Dissolved Chromium g/m3 0.94 3.5 13.9 - - Dissolved Copper g/m3 < 0.0005 0.0010 < 0.0010 - - Dissolved Lead g/m3 0.064 0.53 1.88 - - Dissolved Nickel g/m3 5.1 31 8.1 - - Dissolved Zinc The following table(s) gives a brief description of the methods used to conduct the analyses for this job. The detection limits given below are those attainable in a relatively simple matrix. Detection limits may be higher for individual samples should insufficient sample be available, or if the matrix requires that dilutions be performed during analysis. A detection limit range indicates the lowest and highest detection limits in the associated suite of analytes. A full listing of compounds and detection limits are available from the laboratory upon request. Unless otherwise indicated, analyses were performed at Hill Laboratories, 28 Duke Street, Frankton, Hamilton 3204. Summary of Methods Sample Type: Aqueous Test Method Description Default Detection Limit Sample No
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