Slide 1: The Challenge of Challenging Geological Times in the South East of South Australia
THE CHALLENGE OF CHALLENGING GEOLOGICAL TIMES IN THE SOUTH EAST OF SOUTH AUSTRALIA For personal use only Peter Rolley 26 November 2021 1
Slide 2: Exploration in the South East Overview
Exploration in the South East Overview For personal use only • Focused on copper – gold • Objective 1 is a new Cu system near Kanmantoo • Objective 2 is a Tier One new discovery in the South East • Seven tenements covering 6,125 km2 • 100% owned by HGO • Engaging with local communities and landowner
Slide 3: Working Together at all Times
Exploration in the South East Working Together at all Times For personal use only 3
Slide 4: Data Collection
Exploration in the South East Data Collection For personal use only • Infill regional Ground Gravity Gravity lines • Infill Passive Seismic for Depth to Basement • Whole Rock and multi-element geochemistry from Historic core holes • Cu Isotope data from multiple veins • Petrology of altered volcanic
Slide 5: Age Data Collection
Exploration in the South East – Age Data Collection (Challenging a view of geologic time?) For personal use only ■ 500 – 490 Ma – Epigenetic Cu-Ag veins & breccias at Kanmantoo – Syn Orogen ■ ????? - Epigenetic Au-Bi & Au-As overprinting Cu-Ag veins at Kanmantoo ■ 483.1 Ma – Cu mineralised Potassic
Slide 6: Many Different Mineralising Events and Ages?
Exploration in the South East – Age Data Collection Many Different Mineralising Events and Ages? For personal use only Pyrite LA – Core is High temp Ni-Co-Se => Followed by Pb => Bi, Cu, W Lower temperature more acidic Credits to; A. A.Chapman and CODES for pyrite LA B. Dr. L.McGee for Cu Isotope Un
Slide 7: Data Processing
Exploration in the South East Data Processing For personal use only • Re-imaged regional Airborne magnetics • 3D regional model of Depth to Basement (DTB) • Imaged regional Gravity • Inversion of regional gravity • Imaged regional Residual Gravity using new DTB surface • Inversion of regional Residu
Slide 8: Basement Interpretation
Exploration in the South East Basement Interpretation For personal use only • Re-interpreted basement geology • Re-interpreted basement structural architecture • Interpreted geophysical targets • (Consultation with two separate geophysicists!) • Overlay geochemical/petrologic indexes • Heritage Cons
Slide 9: Arc Driven Cu-Au-Mo?
Exploration in the South East Arc Driven Cu-Au-Mo? For personal use only • If we take a “view” of the porphyry opportunity within Sth Aust based on • Boninite occurrence (subduction zone – Prof J.Foden) • Porphyry fractionation indexes (Loucks, Wells, et al) • Cu-Mo porphyry occurrences (Anabama, Be
Slide 10: Paterson Province Style?
Exploration in the South East – Paterson Province Style? For personal use only • If we take a different view of the south-east tectonics, with • Local high Buchan Type metamorphism • Biotite dominant meta-sediment hosts • Fe sulphides with Chalcopyrite, Bi, Ag, W • Vein, breccia and skarn textures •
Slide 11: A Problem of Timing! Porphyry Cu-Au Geochemical Targets
Exploration in the South East a problem of Timing! Porphyry Cu-Au Geochemical Targets For personal use only • As a result of the geophysical and geochemical interpretation we now have a total of • >70 targets The targets include syn and post Delamerian mineralising events and include Porphyry target
Slide 12: A Problem of Timing! Porphyry Arc Geophysical Targets
Exploration in the South East a problem of Timing! Porphyry Arc Geophysical Targets For personal use only • As a result of the geophysical and geochemical interpretation we now have a total of • >70 targets The targets include syn and post Delamerian mineralising events and include Porphyry targets
Slide 13: A Problem of Timing! Intrusive Related Cu-Au Geochemical Targets
Exploration in the South East a problem of Timing! Intrusive Related Cu-Au Geochemical Targets For personal use only • As a result of the geophysical and geochemical interpretation we now have a total of • >70 targets The targets include syn and post Delamerian mineralising events and include Porphy
Slide 14: A Problem of Timing! Intrusive Related Cu-Au Geophysical Targets
Exploration in the South East a problem of Timing! Intrusive Related Cu-Au Geophysical Targets For personal use only • As a result of the geophysical and geochemical interpretation we now have a total of • >70 targets The targets include syn and post Delamerian mineralising events and include Porphy
Slide 15: No problem with Timing of Cu-Au at Stella
Exploration in the South East No problem with Timing of Cu-Au at Stella For personal use only Directly adjacent to Kanmantoo Mining Lease and processing plant Multiple Au-Cu zones in first Stella hole, including a high-grade gold interval within 82.35m alteration zone in a syn-Delamerian vein brecci
Slide 16: Yes, there is a problem with Timing at Stella!
Exploration in the South East Yes, there is a problem with Timing at Stella! For personal use only But what are the albite-carbonate- pyrrhotite/pyrite veins with Cu-Au doing? Totally x-cut all Delamerian fabrics and un- deformed Directly resulting in albitisation and carbonate alteration of the hos
Slide 17: A problem of Timing at Kanappa!
Exploration in the South East a problem of Timing at Kanappa! For personal use only • Diamond drilling intersected an undeformed monzonite • Age dating has dated titanite at 487-478 Ma • With disseminated pyrrhotite throughout • Chalcopyrite pyrite carbonate quartz veins • Skarn mineralisation in ad
Slide 18: A problem of Timing at Sherlock!
Exploration in the South East a problem of Timing at Sherlock! For personal use only • Diamond drilling intersected 11% Cu at Sherlock1 • Veins syn-dominant foliation or x-cut Delamerian foliation • Alteration and veining is post-metamorphic • Felsic albite-quartz intrusives x-cut by pyrite-chalco-p
Slide 19: A problem of Timing at Tolmer!
Exploration in the South East a problem of Timing at Tolmer! For personal use only • Diamond drilling intersected a monzodiorite • Intrusive is undeformed but age unknown (mapped as EOd25 by GSSA i.e. post Delamerian) • Altered by K-spar potassic alteration • Cross-cut by epidote veins containing py
Slide 20: A problem of Timing for Gold!
Exploration in the South East a problem of Timing for Gold! For personal use only • One Diamond hole at Cadzow intersected a highly altered and gossanous basalt in contact with an alkali-syenite, both undeformed • Strong sericite and carbonate alteration and veining • Magmatics show strong Cu Porphy
Slide 21: In Conclusion
Hillgrove is driving forward the geologic foundations for the discovery of a new Tier 1 Cu-Au deposit in the South East For personal use only In Conclusion The Macquarie Arc Porphyry Cu-Au systems started during the Cambrian in eastern South Australia, Western Vic & Western NSW. HGO’s tenements cove
Slide 22: Driving forward the geologic foundations for a new Tier 1 Cu-Au deposit
Hillgrove is driving forward the geologic foundations for the discovery of a new Tier 1 Cu-Au deposit in the South East For personal use only The lack of work by explorers and research over the past 30 years has resulted in many unknowns about this Cambro-Ordovician Cu-Au mineralised belt. However,
Slide 23: With Thanks
Exploration in the South East For personal use only WITH THANKS ■ David, Keryn, Dale & Mark at the Tonsley Core Library ■ Stacey, Tom, Wolfgang at the GSSA ■ Roger Taylor - petrology ■ Jayson and John at Resource Potentials ■ The great team at Hillgrove incl Caitlin, Aidan, Brett, Darren, Henry, Joh
Slide 24: Disclaimer
Exploration in the South East For personal use only Disclaimer No representation or warranty is or will be made by any person (including Hillgrove Resources Limited ACN 004 297 116 (“Hillgrove”, “HGO”, or the “Company”) and its officers, directors, employees, advisers and agents) in relation to the
Slide 25: Past ASX releases
Exploration in the South East For personal use only Past ASX releases Date ASX Release 2004-11-23 Quarterly Report - Kanappa Results 2005-02-09 Quarterly Report -Mt Rhine Results 2006-12-14 Mt Rhine Channel Results 2017-05-25 High grade Copper Gold at Kanappa 2017-10-20 Kanappa Soil geochemistry 201