Announcement PDF New Acquisitions Presentation October 2025 ANTIMONY AND GOLD - IDAHO • NEIGHBOURING PERPETUA’S STIBNITE MINE & RESOLUTION MINERALS’ HORSE HEAVEN PROJECT • PAST PRODUCING MINES ANTIMONY - WASHINGTON • PAST PRODUCING ANTIMONY, GOLD AND SILVER MINES 1 Pinnacle Minerals Investor Presentation October 2025 • NEIGHBOURING PERPETUA’S STIBNITE MINE AND RESOLUTION MINERALS’ HORSE HEAVEN PROJECT • PAST PRODUCING MINES ANTIMONY AND GOLD - IDAHO • PAST PRODUCING ANTIMONY, GOLD AND SILVER MINES ANTIMONY - WASHINGTON 2 Pinnacle Minerals Investor Presentation October 2025 DISCLAIMER AND FORWARD-LOOKING STATEMENT This presentation been prepared by Pinnacle Minerals Limited (Company). This presentation is not an offer, invitation, solicitation or other recommendation with respect to the subscription for, purchase or sale of any securities in the Company. This presentation has been made available for information purposes only and does not constitute a prospectus, short form prospectus, profile statement or offer information statement nor does it constitute investment or financial product advice (nor taxation, accounting or legal advice) and it is not intended to be used as a basis for making an investment decision. This presentation is provided expressly on the basis that you will carry out your own independent inquiries into the matters contained in the presentation and make your own independent decisions about the affairs, financial position or prospects of the Company. The Company reserves the right to update, amend or supplement the information at any time in its absolute discretion (without incurring any obligation to do so). To the maximum extent permitted by law neither the Company, nor its related bodies corporate, officers, their advisers, agents and employees accept any responsibility or liability to any person or entity as to the accuracy, completeness or reasonableness of the information, statements, opinions or matters (express or implied) arising out of, contained in or derived from this presentation or provided in connection with it, or any omission from this presentation, nor as to the attainability of any estimates, forecasts or projections set out in this presentation. Any such responsibility or liability is, to the maximum extent permitted by law, expressly disclaimed and excluded. Nothing in this material should be construed as either an offer to sell or a solicitation of an offer to buy or sell securities in the United States or any other jurisdiction where it would be illegal. It does not include all available information and should not be used in isolation as a basis to invest in the Company. This presentation has been made available for information purposes only and does not constitute a prospectus, short form. This presentation may contain forward- looking statements. These statements relate to the Company’s expectations, beliefs, intentions or strategies regarding the future. These statements can be identified by the use of words like “anticipate”, “believe”, “intend”, “estimate”, “expect”, “may”, “plan”, “project”, “will”, “should”, “seek” and similar words or expressions containing same. These forward-looking statements reflect the Company’s views and assumptions with respect to future events as of the date of this release and are subject to a variety of unpredictable risks, uncertainties, and other unknowns. Actual and future results and trends could differ materially from those set forth in such statements due to various factors, many of which are beyond our ability to control or predict. These include, but are not limited to, risks or uncertainties associated with the acquisition and divestment of projects (including risks associated with completing due diligence and, if favourable results are obtained, proceeding with the acquisition of the Gamma Project), joint venture and other contractual risks, metal prices, exploration, development and operating risks, competition, production risks, sovereign risks, regulatory risks including environmental regulation and liability and potential title disputes, availability and terms of capital and general economic and business conditions. Given these uncertainties, no one should place undue reliance on any forward-looking statements attributable to the disclose the Exploration Results in accordance with the JORC Company, or any of its affiliates or persons acting on its behalf. Subject to any continuing obligations under applicable law, the Company disclaims any obligation or undertaking to disseminate any updates or revisions to any forward-looking statements in this presentation. . 3 Pinnacle Minerals Investor Presentation October 2025 COMPETENT PERSONS AND COMPLIANCE STATEMENT The information in this presentation that relates to exploration results is based on, and fairly represents, information and supporting documentation compiled by Mr William Witham, who is a Member of the Australasian Institute of Geoscientists (MAIG). Mr Witham is the Executive Chairman of Pinnacle Minerals Limited and has sufficient experience relevant to the style of mineralisation and type of deposit under consideration and to the activity being undertaken to qualify as a Competent Person as defined in the 2012 Edition of the JORC Code. Mr Witham consents to the inclusion in this presentation of the matters based on his information in the form and context in which it appears. The exploration results referenced in this announcement relate to historical drilling and trenching completed before the introduction of the JORC Code (2012). While the Company considers the data to be of sufficient geological quality to support an exploration targeting program, it does not satisfy the requirements of the JORC Code (2012) due to the absence of verifiable QAQC protocols, including a lack of information on sample duplicates, blanks, standards, and assay laboratory procedures. The Competent Person has not done sufficient work to disclose the Exploration Results in accordance with the JORC Code 2012. Investors are cautioned that the historical results are qualitative and indicative in nature only. The Company is not treating these results as reporting in accordance with the JORC Code (2012), and accordingly, they should not be relied upon as representing Mineral Resources or Ore Reserves. Further work, including confirmatory drilling and modern sampling programs, is required to verify the reliability and relevance of the historical data. Further evaluation and exploration work may reduce confidence in the exploration results when reported under the JORC Code 2012. Notwithstanding the above, nothing has come to the Company's attention that raises questions about the accuracy or reliability of the historical results. However, the Company has not independently validated the historical results and therefore does not report, adopt, or endorse those results. The information in this announcement relates to historical exploration results that have been released on the ASX in the Pinnacle Minerals Limited ASX announcement dated 14 October 2025. Pinnacle Minerals confirms that it is not aware of any new information or data that materially affects the information included in the original market announcements and that, all material assumptions and technical parameters underpinning the estimates continue to apply and have not materially changed. The Company confirms that the form and context in which the Competent Person’s finding is presented have not been materially modified from the original market announcements. 4 Pinnacle Minerals Investor Presentation October 2025 DEAL SUMMARY . Pinnacle Minerals Limited (ASX: PIM, or the Company) is pleased to announce it has executed a binding sale agreement to acquire Idaho Antimony Corporation the owner of eight antimony, gold and silver projects in two highly-prospective and well-established mining regions in the Pacific Northwest USA. For further details, please see ASX announcement dated 15 October 2025. 5 Pinnacle Minerals Investor Presentation October 2025 PPTA.NAS A$3bn market cap RML.ASX A$108m mkt cap EIGHT PROJECTS IN THE PACKAGE Idaho, USA Idaho Antimony Corp controls a total of 208 USFS claims (16.87 km2 license area) in Idaho, covering and surrounding historic antimony & gold mines and workings neighbouring Perpetua Resources’ $3 billion Stibnite Mine. This portfolio includes: Gold 1 Thunder Mountain Gold Project Antimony 2 Smith Creek Antimony Project 3 Routson Antimony Project 4 Logan Creek Antimony Project 5 Silver Cliff Antimony Project 6 Big Creek Antimony Project Washington, USA Antimony 7 Antimony Queen Project Gold & Silver 8 Justice Mine Project 6 Pinnacle Minerals Investor Presentation October 2025 IDAHO - MINING HUB Ranked 7th best mining jurisdiction in the USA (Fraser Institute) Excellent infrastructure and strong state support for mining SPEED Act (2025) to streamline permitting and project development Idaho Antimony Corp controls a portfolio of assets in a historic and mining-friendly jurisdiction IDAHO ANTIMONY CORP RML.ASX AUD$108m market cap PPTA.NAS A$4.24 bn market cap 7 Pinnacle Minerals Investor Presentation October 2025 PPTA.NAS (A$3bn MC) RML.ASX A$108m MC STRATEGIC LOCATION – BETWEEN TWO MAJOR MINES Projects are located between Perpetua Resources’ (Mkt Cap AUD $4.24bn) Stibnite Mine and Resolution Minerals’ (Mkt Cap A$80m) Horse Heaven Project Positioned within the same structural corridor – high potential for new antimony-gold systems Shares geological characteristics and mineralization style with Stibnite 8 Pinnacle Minerals Investor Presentation October 2025 IDAHO PROJECT PORTFOLIO Lightning Peak open pit (inside Pinnacle Minerals Limited's claims) Idaho Antimony Corp controls 208 USFS claims covering 16.9 km² across six key projects: 1 Thunder Mountain Gold 2 Smith Creek Project 3 Routson Project 4 Logan Creek Project 5 Silver Cliff Lode Project 6 Big Creek Project 9 Pinnacle Minerals Investor Presentation October 2025 6 5 4 3 2 1 IDAHO PROJECT PORTFOLIO Idaho Antimony Corp controls 208 USFS claims covering 16.9 km² across six key projects: Lightning Peak open pit (inside Idaho Antimony Corp claims) Thunder Mountain Gold Project Routson Project Smith Creek Project Big Creek Project Logan Creek Project Silver Cliff Lode Project 10 Pinnacle Minerals Investor Presentation October 2025 THUNDER MOUNTAIN GOLD PROJECT – OVERVIEW Historic production district with multiple past- producing mines Significant potential for mine restart and resource expansion Includes the Lightning Peak open pit (former Coeur d’Alene operation) Produced over 100,000 oz Au between 1986–1992* *From historical public records of the Idaho Geological Survey www.idahogeology/pub/Digital_Databases 11 Pinnacle Minerals Investor Presentation October 2025 HISTORIC PRODUCTION Year Crude ore (tons) Gold (ounces) Silver (ounces) 1902 3,162 711.63 394 1903 4,123 1,030.00 1904 8,636 3,939.00 2,239 1905 10,464 3,171.48 2,092 1906 11,786 3,069.95 2,126 1907 8,920 1,784.73 1,248 1911 732 207.86 122 1916 a 102.52 67 1918 a 211.19 139 1919 a 93.45 57 47,823 14,341.81 8,484 Thunder Mountain – Historic Production Dewey and Sunnyside mines Dewey Mine: (Adjacent to PIM’s claims) Lightning Peak Open Pit (Within PIM’s claims) Panoramic view of the Thunder Mountain mines. Historical productions based on : Idaho Bureau of Mines/USGS report: https://www.idahogeology.org/Uploads/Data/MineDocs/CH0069_027.pdf - pp 38. 12 Pinnacle Minerals Investor Presentation October 2025 2 3 5 4 1 2025 SPRING FIELD CAMPAIGN – THUNDER MOUNTAIN 1 2 3 4 5 Completed Spring 2025 Confirmed presence of historic workings and mineralization across project area Supports planned geological and environmental assessments 13 Pinnacle Minerals Investor Presentation October 2025 LIGHTNING PEAK OPEN PIT MINE RESTART POTENTIAL Lightning Peak open pit (Inside Pinnacle Minerals claims) The Lightning Peak Open Pit Mine is located within Pinnacle Minerals and was part of Coeur d'Alene Mines Corporation’s heap-leach gold operation In 1989, the mine produced 17,315 oz of gold and 22,744 oz of silver from 583,751 tons of ore In 1990, mining focused entirely on Lightning Peak, yielding an estimated 25,000 oz of gold and 30,000 oz of silver The proposed pit was projected to produce around 1 million tons of ore, with an estimated reserve of 70,000 oz of gold Grades were strong and comparable to the nearby Sunnyside Mine, averaging 0.07 to 1.0 oz per ton Historical productions based on : Idaho Bureau of Mines/USGS report: https://www.idahogeology.org/Uploads/Data/MineDocs/CH0069_027.pdf - pp 38. 14 Pinnacle Minerals Investor Presentation October 2025 Werdenhoff Small-scaled Gold Operation PROJECT – SMITH CREEK PROJECT Northernmost Idaho target with historic antimony occurrences. Structural contact zones between gneiss and phyllite enhance potential. 2.1 km² license area. 15 Pinnacle Minerals Investor Presentation October 2025 Big Creek Airstrip PROJECT – ROUTSON PROJECT Idaho Antimony 2025 Field Visit Historic mining workings from the project 4.9 km² license area. Contains historic Green Spider and Routson prospects. Adjacent to Big Creek Airstrip Hosts marble and calc-silicate metasiltites with metamorphosed volcanic sequences. 16 Pinnacle Minerals Investor Presentation October 2025 PROJECT – LOGAN CREEK Underlain by porphyritic granite to granodiorite along Johnson Creek Shear 1.5 km² license area located 7.5 km SW of Routson. Historical antimony occurrences reported 17 Pinnacle Minerals Investor Presentation October 2025 PROJECT – SILVER CLIFF LODE 1 km² license area located ~14 km west of Perpetua, 6kms south of Yellow Pine Historic samples up to 4.2% Sb Hosted in muscovite-biotite granite to granodiorite 18 Pinnacle Minerals Investor Presentation October 2025 PROJECT – BIG CREEK PROJECT Thunder Mountain Big Creek Stibnite Gold Project 3.5 km² license area. Geological analogue to Perpetua’s Stibnite Gold Project. Roof Pendants Present Strong potential for antimony-gold mineralization in similar structural setting. 19 Pinnacle Minerals Investor Presentation October 2025 WASHINGTON ANTIMONY +Au +Ag PROJECTS Projects: Antimony Queen Project Justice Mine Project Location: North-central Okanogan County Washington and Cascade Range Historic production of antimony (Sb), gold (Au), and silver (Ag) 20 Pinnacle Minerals Investor Presentation October 2025 ANTIMONY QUEEN PROJECT Area: 1,235 acres (~5 km²) in Okanogan County Historic production since 1906 ~1,000 tons stibnite ore & several hundred tons antimony oxide Recent Work: 2025 LiDAR analysis confirmed historic adits and mine workings Historical productions based on : CES, 2004 Site inspection, Antimony Queen Mine: Unpublished USFS report, Contract #10181-1-D007, 20 p. plus tables, figures and appendices. 21 Pinnacle Minerals Investor Presentation October 2025 JUSTICE MINE PROJECT Area: 63 acres (0.25 km²) Located in Monte Cristo district, active 1889–1907 Two Mine area 78 miles from Seattle Historical productions based on : Fritz E. Wolff, Donald T. McKay, Jr., and David K. Norman, 2003. "In active and Abandoned Mine Lands— Mystery and Justice Mines,, Monte Cristo Mining District, Snohomish County, WashingtonWashington Division of Geology and Earth Resources Open File Report 2003-7 Combined production (Justice + Golden Cord): ~34,000 tons; early Rockefeller syndicate backing 22 Pinnacle Minerals Investor Presentation October 2025 CAPITAL STRUCTURE Indicative Capital Structure Shares Options TOTAL Current issued capital Securities to be issued under the Placement Securities to be issued as Consideration (plus Facilitation Fee*) 111,829,132 37,500,000 51,718,750* 64,760,800 18,750,000 29,218,750* 201,047,882 112,229,550 *Facilitation Fee is 6,718,750 shares and 6,718,750 options 23 Pinnacle Minerals Investor Presentation October 2025 BOARD OF DIRECTORS William (Bill) Witham Executive Chairman BSc (Hons) Geology UWA MAIG • Bill Witham is an experienced Executive Director skilled in corporate finance, government relations and mineral exploration in Australia, Africa and South America. • Bill has strong technical experience in airborne geophysics, structural geology, focusing primarily on lithium, uranium and gold. • Bill was the founding director and the executive and technical management of Electrostate Limited. Electrostate developed the Yinnietharra Lithium Project in WA which was sold to Delta Lithium Limited (ASX:DLI) for a circa $25 million vendor consideration in September 2022. • Bill has held senior executive roles across the Australian and African resources sector for 35 years both in exploration and advocacy. Bill was CEO of the Australia - Africa Minerals and Energy Group (AAMEG) from 2018 to 2022 and with the Chamber of Minerals & Energy WA from 2013 to 2016. Lincoln Liu Non-Executive Director BBus, MCom, MBA • For over a decade. Lincoln has worked in Australian equities including stockbroking, research and investment banking. Lincoln has experience in IPO's, Placements, Private Equity and M&A. • Industry expertise in the resources sector and has worked extensively with growth companies including battery metals explorers and developers. • Co-founder of a Sydney-based Corporate advisory firm. • Holds a Master of Commerce (Finance) from UNSW & and MBA from USYD. Stephen Ross Non-Executive Director BSc (Geology) FFin MAusIMM MAICD • Stephen Ross is a geologist, independent consultant and public company director who has been involved in the international minerals industry in technical, business development and corporate positions for 30 years. • He is a member of the Australasian Institute of Mining and Metallurgy, a member of the Australian Institute of Company Directors and a Fellow of the Financial Services Institute of Australasia. Stephen is currently the Managing Director of Desert Metals Limited, Chairman of Power Minerals Limited and a non-executive director of Pinnacle Minerals Limited Jay Stephenson Company Secretary MBA, CA, FCPA, FGIA, FCIS, CPA (Canada), CMA (Canada), MAICD • Jay Stephenson has been involved in business development for over 30 years including approximately 26 years as Director. Chief Financial Officer and Company Secretary for various listed and unlisted entities in resources, manufacturing, information technology, wine, hotels and property. • Jay has been involved in business acquisitions, mergers, initial public offerings, capital raisings, business restructuring as well managing all areas of finance for companies. 24 Pinnacle Minerals Investor Presentation October 2025 CONTACT PINNACLE MINERALS LTD +61 417 097 172 admin@pinnacleminerals.com.au william.witham@pinnacleminerals.com.au abbey@janemorganmanagement.com.au www.pinnacleminerals.com.au 25 Pinnacle Minerals Investor Presentation October 2025 THANK YOU 26 Pinnacle Minerals Investor Presentation October 2025