Announcement PDF Link RIU Good Oil Presentation 16 September 2026 ASX:BAS BASS OIL LIMITED AN EMERGING AUSTRALIAN OIL & GAS PRODUCER RIU Good Oil - September 2026 2 DISCLAIMER This document is confidential and may not be reproduced, redistributed or passed on, directly or indirectly. This document is neither a prospectus nor an offer to subscribe for Shares. The purpose of this presentation is to provide general information about Bass Oil Ltd (“Bass” or the “Company”). This presentation is current as at 1 September 2026 (unless otherwise stated herein) and the information contained in it is in a summary form and does not purport to be complete. The information in this presentation remains subject to change without notice. It is not recommended that any person makes any investment decision in relation to the Company based solely on this presentation. This presentation does not necessarily contain all information which maybe material to the making of a decision in relation to the Company. Any investor should make their own independent assessment and determination as to the Company’s prospects prior to making any investment decision and should not rely on the information in this presentation for that purpose. This presentation does not involve or imply a recommendation or a statement of opinion in respect of whether to buy, sell or hold securities in the Company. The securities issued by the Company are considered speculative and there is no guarantee that they will make a return on the capital invested, that dividends will be paid on the shares or that there will be an increase in the value of the shares in the future. This presentation is not, and does not constitute, an offer to sell, or the solicitation, invitation or recommendation of an offer to buy, any securities in any jurisdiction, including the United States, and neither this presentation, nor any of the information contained herein, shall form the basis of any contract or commitment. The information in the presentation does not constitute an advertisement for an offer or proposed offer of securities and does not constitute a representation that an offering will occur. No person is authorised to give information or make any representation that an offering will occur. Any securities of Bass have not been, and will not be, registered under the U.S. Securities Act or the securities laws of any state or other jurisdiction of the United States and, if there is an offer of securities, may not be offered or sold in the United States except in transactions exempt from or not subject to, the registration requirements of the U.S. Securities Act and any other applicable securities laws. This presentation is presented for informational purposes only. It is not intended to be, and is not, a prospectus, product disclosure statement, offering memorandum or private placement memorandum for the purpose of Chapter 6D of the Corporations Act 2001. Except for statutory liability which cannot be excluded, the Company, its officers, employees and advisers expressly disclaim any responsibility for, and make no representations or warranty for, the accuracy or completeness of the material contained in this presentation and exclude all liability whatsoever (including in negligence) for any loss or damage which may be suffered by any person as a consequence of any information in this presentation or any error or omission there from. The Company accepts no responsibility to update any person regarding any inaccuracy, omission or change in information in this presentation or any other information made available to a person nor any obligation to furnish the person with any further information. This presentation contains “forward-looking statements” and comments about future events, including statements about Bass’s expectations about the performance of its business. Forward-looking statements may include words such as “anticipate”, “believe”, “expect”, “project”, “forecast”, “estimate”, “out-look”, “upside”, “likely”, “intend”, “should”, “could”, “may”, “target”, “plan”, and other similar expressions. Indications of, and guidance on, future earnings and financial position and performance are also forward-looking statements. Forward-looking statements, opinions and estimates provided in this presentation are based on assumptions and contingencies which are subject to change without notice. Forward-looking statements including projections, guidance on future earnings and estimates are provided as a general guide only and should not be relied upon as an indication, prediction or guarantee of future performance. Actual results may differ materially from those expressed or implied in such statements and these differences maybe material. The forward-looking statements in this presentation involve known and unknown risks and other factors, many of which are beyond the control of, or unknown to, Bass, its directors, officers and employees, and may involve significant elements of subjective judgement and assumptions as to future events which may or may not be correct. Such forward looking statements are based on information available to Bass as at the date of this presentation. Recipients are cautioned not to place undue reliance on forward looking statements and except as required by law or regulation, Bass assumes no liability to update these forward-looking statements. Such statements speak only as of the date hereof, and Bass has no obligation to update or revise any such statements to reflect any change in events, conditions or circumstances on which any such statement is based. No representation or warranty, express or implied, is made by the Company that the matters stated in this presentation will be achieved or prove to be correct. Recipients of this presentation must make their own investigations and inquiries regarding all assumptions, risks, uncertainties and contingencies which may affect the future operations of the Company or the Company’s securities. The Company does not purport to give financial or investment advice. No account has been taken of the objectives, financial situation or needs of any recipient of this document. Recipients of this document should carefully consider whether the securities issued by the Company are an appropriate investment for them in light of their personal circumstances, including their financial and taxation position. Resources and Reserves Statement Cautionary Statement The estimated quantities of petroleum that may potentially be recovered by the application of a future development project(s) relate to undiscovered accumulations. These estimates have both a risk of discovery and a risk of development. Further exploration appraisal and evaluation is required to determine the existence of a significant quantity of potentially recoverable hydrocarbons. Qualified Petroleum Reserves and Resources Evaluator Statement The information contained in this report regarding the Bass Oil Limited reserves and contingent resources is based on and fairly represents information and supporting documentation reviewed by Mr Giustino Guglielmo who is an employee of Bass Oil Limited and holds a Bachelor of Engineering (Mech). He is a member of the Society of Petroleum Engineers (SPE) and a Fellow of the Institution of Engineers Australia (FIEAust) and as such is qualified in accordance with ASX listing rule 5.4.1 and has consented to the inclusion of this information in the form and context in which it appears. Important Notice RIU Good Oil - September 2026 3 COMPANY OVERVIEW ➢ Bass - an ASX listed energy company with:- ➢ Oil production - Cooper Basin & Indonesia ➢ Growth from a number of oil & gas development projects ➢ Attractive exploration targets ➢ Recent Indonesian well finds new oil – to significantly increase production & revenue ➢ Entering East Coast Gas Market (ECGM) by end 2026 via Vanessa Gas field ➢ Vanessa to accelerate appraisal of deep coal gas resource in PEL 182 ➢ Development of the Kiwi rich gas field - ‘company making’ medium term growth potential Poised for growth - expanding oil and gas production at a time of sustained high prices RIU Good Oil - September 2026 4 FINANCIAL SNAPSHOT ASX Code BAS Shares (Ordinary) 367,005,947 Share Price $0.066 Market Capitalisation A$24.2m Enterprise Value A$21.0m Net Cash (30 Jun 2026) A$3.2m Total No. Shareholders 2,174 Snapshot Share Price 12-Month Chart Company is committed to becoming a profitable mid-tier oil and gas producer Ownership Summary 10.1% 7.5% 82.4% Board & Management Retail Corporate - 10.0m 20.0m 30.0m 40.0m 50.0m - $0.04 $0.08 $0.12 Sep-25 Nov-25 Jan-26 Mar-26 May-26 Jul-26 Volume Share Price RIU Good Oil - September 2026 5 DIRECTORS The company has an experienced team with a proven track record Laura Reed Non-executive Director MBA, BBus (Accounting) & FCPA • +35 years of financial experience in the energy sector • Former Chairperson of Spark Infrastructure Group, Non- Executive Director of ATCO Australia & Canadian Utilities Limited • Previous roles include Chief Financial Officer, Chief Executive Officer & Managing Director Hector M Gordon Chairman, Non-executive Director BSci (Hons) • +45 years of experience in upstream petroleum industry • Former Executive Director & CEO Beach Energy, Non-Executive Director Cooper Energy • Previous employers include Santos Limited, AGL Petroleum, TMOC Resources, Esso Australia & Delhi Petroleum Pty Ltd Tino Guglielmo Managing Director BEng (Mech), FIEAust, MSPE & MAICD • +40 years of technical, managerial & senior executive experience in Australia & internationally • Previous CEO & Managing Director of Stuart Petroleum Ltd and Ambassador Oil & Gas • Former employers include Santos Limited, Delhi Petroleum Limited & NYSE listed Schlumberger Corp RIU Good Oil - September 2026 6 BUNIAN 6 – A PLATFORM FOR GROWTH ➢ Bunian 6 intersected high quality oil pay in the TRM3 and K1 reservoirs as expected ➢ The well also discovered oil in a new zone ➢ The high quality M sand ➢ Produced 1280 barrels of oil per day on test ➢ The well has been completed and will be brought on line after testing ➢ The static and dynamic reservoir models will be updated to inform the field reserves ➢ The Bunian well adds weight to a significant westerly field extension Exceeds Expectations – Delivers Production, Revenue and Reserves Growth TRM3 K1 M RIU Good Oil - September 2026 7 VANESSA ACQUISITION – ENTRY INTO GAS MARKET Please refer to ASX Announcement, 1“Significant Gas Resource Identified in PEL 182” and 2“PEL182 Geomechanical Study Results” released 16 November 2022 and 16 September 2024 respectively for further information and page 2 - Cautionary Statement ➢ Includes processing facility & pipeline connection to the Cooper Basin network ➢ Gas sales into the ECGM - by late 2026 ➢ Upside - from fracking conventional, tight & coal gas pay ➢ Deep coals at Vanessa, have an assessed prospective resource (2U) of 568 BCF of gas with 22.7 million barrels of condensate1,2 ➢ Next steps; ➢ Recommission facility ➢ Commence gas sales ➢ Well and frack designs to exploit gas resource ➢ Santos appraising coal resource potential in adjacent acreage PEL-182 Deep Coal Gas field map Gas/liquids separator in place at Vanessa facility An existing gas field with near-term production and long-term growth RIU Good Oil - September 2026 8 KIWI FIELD | HIGH VALUE TRIASSIC GAS Map of Bass’ Kiwi Gas Field – Northern Cooper Basin Triassic Gas & Oil Play Please refer to ASX Announcements, “2025 Reserves and Contingent Resources” , “Kiwi 1 Extended Production Test (EPT) Update” and “Kiwi-1 Demonstrates Strong Initial Results from EPT”, released 26 March 2026, 26 September 2023 and 27 August 2024 respectively for further information ➢ Kiwi gas liquids rich and low CO2 ➢ Production test yielded 4.1 million cu-ft/day gas & 988 barrels of condensate per day2 ➢ Screening economics yield ATAX NPV of $20+ million ➢ Kiwi alone is 1+ million boe Contingent Resource (2C), more than double Bass’ booked reserves ➢ SA Government awards Bass $3.5 million grant to cornerstone pipeline project ➢ Kiwi – a new play being pursued by Triassic gas study currently underway Bass holds entire Basement Terrace hosting Callamurra Gas Play RIU Good Oil - September 2026 9 TRIASSIC GAS STUDY (Cont’d) 2026 Reprocessed Seismic – A huge improvement in data quality 2017 Data 2026 Data Repro Area Gas sand event is resolved and truncation is imaged Kiwi-1 Keleary-1 Kiwi-1 Keleary-1 Kiwi-1 Keleary-1 Faults are better imaged RIU Good Oil - September 2026 10 TRIASSIC GAS STUDY (Cont’d) Seismic Better Defines Basement Architecture, Depositional Model & Traps ➢ Kiwi is on a Basement Terrace between the Deramookoo Platform & the Arrabury Trough ➢ Triassic & Permian sediments abut the Platform - few wells drilled on the Terrace ➢ Kiwi gas sand deposited by rivers flowing east across the Basement Platform toward the floodplain in the Trough ➢ Additional anticlinal structural traps identified ➢ Fault &/or Stratigraphic traps possible - allowing for larger traps ➢ Geochem study results favor Permian coal as gas source Floodplain Axial Channel System Deramookoo Basement Platform Depositional Model Basal Callamurra Distributive Fluvial Systems Kiwi-1 Callamurra Gas Sand Horizon Deramookoo Basement Platform RIU Good Oil - September 2026 11 OUTLOOK Accelerating Oil Production ➢ Bunian 6 well result to boost production & revenue Gas Sales from Vanessa ➢ Vanessa enables for first gas sales into the EGCM ➢ Recommissioning project underway ➢ Enables fast-track appraisal of the deep coal gas project in PEL 182 Kiwi Field Development has Follow-up ➢ Triassic gas study uncovering multiple follow up opportunities ➢ Engineering FEED studies progressing well ➢ Funding options to accelerate the development under review Increasing cash flows - portfolio contains multiple high potential oil and gas assets Gas flare at Kiwi-1 wellsite Tino Guglielmo – Managing Director tino.guglielmo@bassoil.com.au +61 3 9927 3000 www.bassoil.com.au