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: 2778761 25-Nov-2021 06-Dec-2021 85959 70051933 Extended suite Rebecca Hillyard SPv1 Sample Type: Aqueous Sample Name: Lab Number: 1838178 24-Nov-2021 1838179 24-Nov-2021 2778761.1 2778761.2 2778761.3 1838180 24-Nov-2021 Individual Tests pH Units 4.1 4.7 7.3 - - pH g/m3 as CaCO3 < 1.0 < 1.0 - - - Acidity (pH 3.7) g/m3 as CaCO3 < 1.0 < 1.0 - - - Total Alkalinity mS/m 216 240 2.5 - - Electrical Conductivity (EC) g/m3 196 70 0.008 - - Dissolved Aluminium g/m3 < 0.0004 < 0.0004 < 0.0002 - - Dissolved Antimony g/m3 0.021 0.026 < 0.005 - - Dissolved Barium g/m3 86 162 1.24 - - Dissolved Calcium g/m3 1.05 1.84 < 0.0002 - - Dissolved Cobalt g/m3 122 26 < 0.02 - - Dissolved Iron g/m3 52 144 0.44 - - Dissolved Magnesium g/m3 11.1 39 0.0060 - - Dissolved Manganese g/m3 < 0.00008 < 0.00008 0.00039 - - Dissolved Mercury g/m3 < 0.0004 < 0.0004 < 0.0002 - - Dissolved Molybdenum g/m3 58 110 1.10 - - Dissolved Potassium g/m3 0.013 0.023 < 0.0010 - - Dissolved Selenium g/m3 < 0.0002 < 0.0002 < 0.00010 - - Dissolved Silver g/m3 45 57 2.1 - - Dissolved Sodium g/m3 0.72 1.06 0.0033 - - Dissolved Strontium g/m3 0.088 0.042 < 0.00002 - - Dissolved Uranium g/m3 0.006 0.002 < 0.0010 - - Dissolved Vanadium g/m3 1,640 1,540 < 5 - - Sulphate Heavy metals, dissolved, trace As,Cd,Cr,Cu,Ni,Pb,Zn g/m3 0.21 0.40 0.0045 - - Dissolved Arsenic g/m3 0.0154 0.029 < 0.00005 - - Dissolved Cadmium g/m3 0.29 0.061 0.0014 - - Dissolved Chromium g/m3 3.4 1.95 0.0086 - - Dissolved Copper g/m3 0.0016 0.0028 < 0.00010 - - Dissolved Lead g/m3 0.34 0.64 < 0.0005 - - Dissolved Nickel g/m3 16.4 16.9 0.027 - - 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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