Octava Minerals Ltd. · ASX:OCT
Octava Minerals — Corporate Update (September 2026)
18 slides from Octava Minerals's corporate update, Sep 28, 2026
Slide 1: West Sierra Grande High-Grade Fluorspar Project
WEST SIERRA GRANDE HIGH-GRADE FLUORSPAR PROJECT ASX: OCT WEST SIERRA GRANDE HIGH-GRADE FLUORSPAR PROJECT Rio Negro Province, Argentina | District-Scale Fluorspar Opportunity A consolidated 400 km² district scale fluorspar project containing multiple historical high-grade 4 Historic grades 400 km² fl
Slide 2: Important notice and Disclaimer
Important notice and Disclaimer The information contained in this document (“Document”) has been prepared by Octava Minerals Limited (referred to as “Octava” or “the Company”). The purpose of this Document is to provide background information to assist readers in obtaining a general understanding of
Slide 3: Project Highlights
Project Highlights Project Highlights Why West Sierra Grande? District-Scale Position Historical Mining Pedigree Significant Discovery Upside 400 km² land package 4 district mines Untested Targets A consolidated fluorspar district covering Historic mines Navidad 65, Viareggio, Victor, Multiple fluor
Slide 4: Why Argentina?
Why Argentina? With its pro-market policies, Argentina is attracting large investments Investment Regime (RIGI): The introduction of competitive economic incentives and lifted currency controls to unlock billions in investments The Threshold The Guarantee Currency Freedom Import Tariffs $200M USD 30
Slide 5: Project Location
Project Location West Sierra Grande Fluorspar Project Argentina – 400km2 in proven Fluorspar discovery region Located 17km west of the town of Sierra Grande (pop. over 8000), Year-round road within the Rio Negro Province, access Argentina West Sierra Grande Fluorspar Project Close to deep water expo
Slide 6: Four Historic Fluorspar Mines
Four Historic Fluorspar Mines Four Historic Fluorspar Mines West Sierra Grande Fluorspar Project 4 HISTORICAL MINES • Navidad 65 Mine • Viareggio Mine • Victor Mine • Escondida Mine HISTORICAL MINING PEDIGREE Historical fluorspar mining activity commenced in the Sierra Grande region in the early 196
Slide 7: Navidad 65 Mine
Navidad 65 Mine Navidad 65 Mine Historical fluorspar system1 and potential resource opportunity Navidad 65 was one of the principal fluorspar mines within the district and forms an important component of the broader Navidad–Viareggio exploration focus. GEOLOGICAL SETTING The deposit is hosted within
Slide 8: Viareggio Mine
Viareggio Mine Viareggio Mine Brecciated fluorspar vein system1 and potential resource opportunity Viareggio hosts a brecciated fluorspar vein system and forms a parallel structure within the broader Navidad–Viareggio fluorspar system. GEOLOGICAL SETTING The deposit comprises a brecciated fluorite-b
Slide 9: Victor Mine
Victor Mine Victor Mine Emerging discovery opportunity1 Victor represents a fluorspar target with significant potential within the West Sierra Grande Fluorspar District. HISTORICAL DEVELOPMENT1 • Approximately 35 metres shaft development • Approximately 100 metres underground gallery • Historical pr
Slide 10: Escondida Mine
Escondida Mine Escondida Mine Emerging discovery opportunity1 Escondida represents a separate, parallel fluorspar occurrence within the district and provides an important opportunity for new discovery. With limited historical work, it remains largely underexplored by modern standards. HISTORICAL WOR
Slide 11: District Scale Fluorspar Potential
District Scale fluorspar Potential District Scale fluorspar Potential Multiple pathways to growth One of the strongest aspects of the West Sierra Grande project is that future value creation is not dependent upon a single deposit or exploration target. Multiple historical producing assets provide in
Slide 12: Summary
Summary Summary West Sierra Grande Fluorspar District The Sierra Grande fluorspar district is one of the most important fluorspar-producing regions in Argentina and contains numerous vein-type deposits. West Sierra Grande represents a rare district-scale fluorspar opportunity with a historical minin
Slide 13: What is Fluorspar
What is Fluorspar Fluorspar is the common name for the mineral fluorite or calcium fluoride, CaF2. It is the main mineralogical source of fluorine. Fluorspar is an essential strategic, critical mineral used in advanced manufacturing supply chains. Global market for fluorspar is estimated to be ~8Mtp
Slide 14: Essential Uses of Fluorspar
Essential Uses of Fluorspar Fluorspar is an essential strategic, critical mineral used in advanced manufacturing supply chains. Hydrofluoric acid production: Acid grade fluorspar is AI semi-conductor chip etching: Fluorspar is converted into reacted with sulfuric acid to produce hydrofluoric acid, t
Slide 15: Next steps – 12 months
Next steps – 12 months Applying modern exploration techniques to a known historic fluorspar producing region • Completion of due diligence process • Detailed satellite data interpretation • Geological and structural mapping • Magnetic geophysical survey • Compile structural settings targets for empl
Slide 16: Corporate Snapshot
CORPORATE SNAPSHOT Shares on Issue and Market Capitalisation (30 June 2026) Shares on Issue (ASX:OCT) 119,515,720 Mr Clayton Dodd - Non-Executive Chairman A Chartered Accountant with more than 40 years’ experience in finance Share Price (at 23 September 2026) A$0.02 and the resources sector in Austr
Slide 17: Important Information – Historical Data
Important Information – Historical Data Important Information – Historical Exploration Results This announcement refers to historical fluorspar grades, vein dimensions, depths of historical workings and historical production for the West Sierra Grande Fluorspar Project and the surrounding Sierra Gra
Slide 18: Competent Person Statement
Competent Person Statement The information in this announcement that relates to the Historical Results and exploration information for the West Sierra Grande Fluorspar Project is based on, and fairly represents, information and supporting documentation reviewed by Mr Bevan Wakelam, a Competent Perso