NI 43-101 Technical Report Macraes Gold Mine Otago, New Zealand
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DocuSign Envelope ID: 804F60A5-0483-497F-B83F-4A01188AADB3 NI 43-101 Technical Report Macraes Gold Mine Otago, New Zealand Effective Date: June 30, 2020 Report Date: September 25, 2020 Report Prepared for OceanaGold Corporation Level 14 / 357 Collins Street Melbourne, Victoria 3000 Australia Report Prepared by: OceanaGold (New Zealand) Limited Golden Point Road RD3 Macraes Flat 9483 East Otago New Zealand Signed by Qualified Persons: Peter Edwards MSc (Hons) Geology, MAIG, MAusIMM (OceanaGold Senior Project Geologist, Macraes) Sean Doyle, BSc (Hons) Geology MAIG, MAusIMM CP (Geo) (OceanaGold Principal Resource Geologist, Macraes)Project Number: v01 Pieter Doelman, BEng (Hons) Mining, MAusIMM CP (Min) (OceanaGold Technical Services & Projects Manager) Tom Cooney, BEng (Hons) Mining, MMan Mining, MAusIMM CP (Min) (OceanaGold General Manager Studies & Project Development) David Carr, BEng (Hons) Metallurgical, MAusIMM CP (Met) Metallurgy (OceanaGold Chief Metallurgist) Reviewed by: Jonathan Moore, BSc (Hons) Geology, MAusIMM CP (Geo), (OceanaGold Chief Geologist) Matthew Hine, BEng (Hons) Mining OceanaGold General Manager Macraes Philip Jones BAppSc (Hons) Geology, MAIG (OceanaGold Exploration & Geology Manager, Macraes) DocuSign Envelope ID: 804F60A5-0483-497F-B83F-4A01188AADB3 OceanaGold (New Zealand) Limited NI 43-101 Technical Report – Macraes Gold Mine 2 TECHNICAL REPORT CERTIFICATION The effective date of this Technical Report and sign off is September 25, 2020 Peter Edwards Date: September 25, 2020 Sean Doyle Date: September 25, 2020 Pieter Doelman Date: September 25, 2020 Tom Cooney Date: September 25, 2020 David Carr Date: September 25, 2020 September 2020 DocuSign Envelope ID: 804F60A5-0483-497F-B83F-4A01188AADB3 OceanaGold (New Zealand) Limited NI 43-101 Technical Report – Macraes Gold Mine 3 Forward-Looking Information This report contains forward-looking statements. All statements, other than statements of historical fact regarding OceanaGold Corporation or Macraes Operations, are forward- looking statements. The words "believe", "expect", "anticipate", "contemplate", "target", "plan", "intend", "project", "continue", "budget", "estimate", "potential", "may", "will", "can", "could" and similar expressions identify forward-looking statements. In particular, this report contains forward-looking statements with respect to cash flow forecasts, projected capital, operating and exploration expenditure, targeted cost reductions, mine life and production rates, potential mineralisation and metal or mineral recoveries, and information pertaining to potential improvements to financial and operating performance and mine life at the Macraes Operations that may result from. All forward-looking statements in this report are necessarily based on opinions and estimates made as of the date such statements are made and are subject to important risk factors and uncertainties, many of which cannot be controlled or predicted. Material assumptions regarding forward-looking statements are discussed in this report, where applicable. In addition to such assumptions, the forward-looking statements are inherently subject to significant business, economic and competitive uncertainties, and contingencies. Known and unknown factors could cause actual results to differ materially from those projected in the forward-looking statements. Such factors include, but are not limited to: fluctuations in the spot and forward price of commodities (including gold, diesel fuel, natural gas and electricity); the speculative nature of mineral exploration and development; changes in mineral production performance, exploitation and exploration successes; risks associated with the fact that the Macraes Operations is still in the early stages of evaluation and additional engineering and other analysis is required to fully assess their impact; diminishing quantities or grades of reserves; increased costs, delays, suspensions, and technical challenges associated with the construction of capital projects; operating or technical difficulties in connection with mining or development activities, including disruptions in the maintenance or provision of required infrastructure and information technology systems; damage to OceanaGold Corporation’s or Macraes Operations reputation due to the actual or perceived occurrence of any number of events, including negative publicity with respect to the handling of environmental matters or dealings with community groups, whether true or not; risk of loss due to acts of war, terrorism, sabotage and civil disturbances; uncertainty whether the Macraes Operation’s will meet OceanaGold Corporation's capital allocation objectives; the impact of global liquidity and credit availability on the timing of cash flows and the values of assets and liabilities based on projected future cash flows; the impact of inflation; fluctuations in the currency markets; changes in interest rates; changes in national and local government legislation, taxation, controls or regulations and/or changes in the administration of laws, policies and practices, expropriation or nationalisation of property and political or economic developments in Canada; failure to comply with environmental and health and safety laws and regulations; timing of receipt of, or failure to comply with, necessary permits and approvals; litigation; contests over title to properties or over access to water, power and other required infrastructure; increased costs and physical risks including extreme weather events and resource shortages, related to climate change; and availability and increased costs associated with mining inputs and labour. In addition, there are risks and hazards associated with the business of mineral exploration, development, and mining, including environmental hazards, industrial accidents, unusual or unexpected formations, pressures, cave-ins, flooding and gold bullion, copper cathode or gold or copper concentrate losses (and the risk of inadequate insurance, or inability to obtain insurance, to cover these risks). Many of these uncertainties and contingencies can affect OceanaGold Corporation’s actual results and could cause actual results to differ materially from those expressed or implied in any forward- looking statements made by, or on behalf of, OceanaGold Corporation. All of the forward-looking statements made in this report are qualified by these cautionary statements and OceanaGold Corporation and the Qualified Persons who September 2020 DocuSign Envelope ID: 804F60A5-0483-497F-B83F-4A01188AADB3 OceanaGold (New Zealand) Limited NI 43-101 Technical Report – Macraes Gold Mine 4 authored this report undertake no obligation to update publicly or otherwise revise any forward‐looking statements whether as a result of new information or future events or otherwise, except as may be required by law. September 2020 DocuSign Envelope ID: 804F60A5-0483-497F-B83F-4A01188AADB3 OceanaGold (New Zealand) Limited NI 43-101 Technical Report – Macraes Gold Mine 5 Table of Contents 1 Summary ............................................................................................................. 19 1.1 Overview ........................................................................................................................................... 19 1.2 Property Description and Ownership ................................................................................................ 19 1.3 Geology and Mineralisation .............................................................................................................. 20 1.4 Drilling and Sampling ........................................................................................................................ 21 1.5 Exploration ........................................................................................................................................ 22 1.6 Mineral Processing and Metallurgical Testing .................................................................................. 22 1.7 Mineral Resource Estimate ............................................................................................................... 23 1.8 Development and Operations ........................................................................................................... 25 1.9 Mineral Reserve Estimate ................................................................................................................. 26 1.10 Mining Methods ................................................................................................................................. 27 1.11 Infrastructure ..................................................................................................................................... 29 1.12 Environmental Studies and Permitting .............................................................................................. 29 1.13 Capital and Operating Costs ............................................................................................................. 30 1.14 Economic Analysis ............................................................................................................................ 32 1.14.1 Assumptions .......................................................................................................................... 32 1.14.2 Cash Flow Analysis ............................................................................................................... 33 1.15 Conclusions ......................................................................................................................................