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 1 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: 2815489 31-Dec-2021 11-Jan-2022 87181 70057893 Reduced suite Kristin Gillard SPv1 Sample Type: Aqueous Sample Name: Lab Number: 1838748 30-Dec-2021 2:00 pm 1838749 30-Dec-2021 2:00 pm 2815489.1 2815489.2 2815489.3 1838750 30-Dec-2021 2:00 pm Individual Tests g/m3 < 0.00008 < 0.00008 < 0.00008 - - Dissolved Mercury Heavy metals, dissolved, trace As,Cd,Cr,Cu,Ni,Pb,Zn g/m3 0.057 0.153 1.20 - - Dissolved Arsenic g/m3 0.0064 0.0049 0.055 - - Dissolved Cadmium g/m3 0.006 0.151 0.078 - - Dissolved Chromium g/m3 1.76 1.14 7.2 - - Dissolved Copper g/m3 0.0014 < 0.0010 0.0083 - - Dissolved Lead g/m3 0.70 0.099 1.02 - - Dissolved Nickel g/m3 2.6 5.0 31 - - 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 1-3 Heavy metals, dissolved, trace As,Cd,Cr,Cu,Ni,Pb,Zn 0.45µm Filtration, ICP-MS, trace level. APHA 3125 B 23rd ed. 2017. 0.00005 - 0.0010 g/m3 1-3 Dissolved Mercury 0.45µm filtration, bromine oxidation followed by atomic fluorescence. US EPA Method 245.7, Feb 2005. 0.00008 g/m3 Ara Heron BSc (Tech) Client Services Manager - Environmental These samples were collected by yourselves (or your agent) and analysed as received at the laboratory. Testing was completed between 06-Jan-2022 and 10-Jan-2022. For completion dates of individual analyses please contact the laboratory. Samples are held at the laboratory after reporting for a length of time based on the stability of the samples and analytes being tested (considering any preservation used), and the storage space available. Once the storage period is completed, the samples are discarded unless otherwise agreed with the customer. Extended storage times may incur additional charges. This certificate of analysis must not be reproduced, except in full, without the written consent of the signatory.
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