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 3 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: 2773857 20-Nov-2021 29-Nov-2021 85959 70056476 Extended suite Mark Burroughs SUPv1 Sample Type: Aqueous 1838000 19-Nov-2021 1838001 19-Nov-2021 1838002 19-Nov-2021 Sample Name: Lab Number: 2773857.1 2773857.2 2773857.3 Individual Tests pH Units 6.2 ± 0.2 4.2 ± 0.2 4.1 ± 0.2 - pH g/m3 as CaCO3 < 1.0 < 1.0 < 1.0 - Acidity (pH 3.7) g/m3 as CaCO3 4.30 ± 0.69 < 1.0 ± 0.67 < 1.0 ± 0.67 - Total Alkalinity mS/m 1.8 ± 0.1 141.8 ± 2.9 352.6 ± 7.1 - Electrical Conductivity (EC) g/m3 0.0088 ± 0.0022 104.7 ± 8.3 234 ± 19 - Dissolved Aluminium g/m3 < 0.0002 ± 0.00014 < 0.002 ± 0.00033 < 0.002 ± 0.00033 - Dissolved Antimony g/m3 < 0.005 ± 0.00025 0.01560 ± 0.00073 0.0931 ± 0.0044 - Dissolved Barium g/m3 1.019 ± 0.072 52.5 ± 3.3 530 ± 34 - Dissolved Calcium g/m3 < 0.0002 ± 0.00014 0.590 ± 0.024 6.35 ± 0.25 - Dissolved Cobalt g/m3 < 0.02 ± 0.014 71.2 ± 4.9 91.4 ± 6.3 - Dissolved Iron g/m3 0.240 ± 0.021 32.1 ± 2.2 483 ± 33 - Dissolved Magnesium g/m3 0.00155 ± 0.00036 6.83 ± 0.59 137 ± 12 - Dissolved Manganese g/m3 < 0.00008 ± 0.000054 < 0.00008 ± 0.000054 < 0.00008 ± 0.000054 - Dissolved Mercury g/m3 < 0.0002 ± 0.00014 < 0.002 ± 0.00035 < 0.002 ± 0.00035 - Dissolved Molybdenum g/m3 0.650 ± 0.058 30.8 ± 2.3 376 ± 28 - Dissolved Potassium g/m3 < 0.0010 ± 0.00067 < 0.010 ± 0.0012 0.0858 ± 0.0078 - Dissolved Selenium g/m3 < 0.00010 ± 0.000067 < 0.0010 ± 0.00064 < 0.0010 ± 0.00064 - Dissolved Silver g/m3 1.40 ± 0.15 28.6 ± 3.1 184 ± 20 - Dissolved Sodium g/m3 0.00271 ± 0.00036 0.438 ± 0.023 3.81 ± 0.20 - Dissolved Strontium g/m3 < 0.00002 ± 0.000014 0.0458 ± 0.0052 0.136 ± 0.016 - Dissolved Uranium g/m3 < 0.0010 ± 0.00067 < 0.010 ± 0.0015 < 0.010 ± 0.0015 - Dissolved Vanadium g/m3 < 5 ± 0.46 943 ± 57 2,550 ± 160 - Sulphate Heavy metals, dissolved, trace As,Cd,Cr,Cu,Ni,Pb,Zn g/m3 0.0164 ± 0.0012 0.1625 ± 0.0091 0.426 ± 0.024 - Dissolved Arsenic g/m3 < 0.00005 ± 0.000034 0.0088 ± 0.0013 0.106 ± 0.016 - Dissolved Cadmium g/m3 0.00352 ± 0.00043 0.168 ± 0.013 0.0534 ± 0.0042 - Dissolved Chromium g/m3 0.00643 ± 0.00068 1.69 ± 0.16 6.01 ± 0.55 - Dissolved Copper g/m3 < 0.00010 ± 0.000067 0.00128 ± 0.00012 0.01321 ± 0.00092 - Dissolved Lead g/m3 < 0.0005 ± 0.00034 0.2040 ± 0.0072 2.242 ± 0.079 - Dissolved Nickel g/m3 0.0529 ± 0.0050 9.38 ± 0.88 59.5 ± 5.6 - Dissolved Zinc The reported uncertainty is an expanded uncertainty with a level of confidence of approximately 95 percent (i.e. two standard deviations, calculated using a coverage factor of 2). Reported uncertainties are calculated from the performance of typical matrices, and do not include variation due to sampling. For further information on uncertainty of measurement at Hill Laboratories, refer to the technical note on our website: www.hill-laboratories.com/files/Intro_To_UOM.pdf, or contact the laboratory.
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