Highlights
- This first-ever drillhole at Target T55 (EL9746), Byrock Project, achieved a key objective — confirming the presence of a porphyry intrusive system beneath cover in a Company interpreted NW extension of the Macquarie Arc, NSW
- The calc-alkalic porphyry intrusion intersected at T55 includes zones of strong, pervasive propylitic alteration consistent with outer zones of a Cu-Au porphyry system
- Co-funded drilling grant awarded by the NSW Government covered 40% of costs
- Drill testing of six Cu-Au targets by neighbours Inflection Resources is planned for early 2026 on adjacent ground to the T55 Target
- Follow-up drilling at the Byrock Project is being planned after the positive results of recent aircore drilling on the Byrock Project Pipe Targets, and these T55 results
Location map showing Altitudes Pipe Targets, T55 Target and tenements relative to Inflection Resources
A critical objective of last year’s integrated exploration air-core and diamond core drilling was to determine whether the Company’s interpreted NW extension of the Macquarie Arc continues beneath cover at the Byrock Project. The results at the Pipe Targets and now the T55 Target provide supporting evidence of the NW extension of the Macquarie Arc interpretation. The project is now progressing to the next stage of the Earn-in agreement.
If confirmed with deeper drilling this year, the presence of economic Cu-Au porphyry mineral systems in the Company interpreted NW extension of the Macquarie Arc, would be very significant for Altitude Minerals and NSW.
Drilling Geology Detail
Drilling intersected transported cover with the mud rotary method, then intersected an intermediate igneous (intrusive) rock, which was drilled with diamond core drilling. At the top of the crystalline basement (beneath the cover), the intermediate intrusion contained abundant biotite and included common rafts of metasediments and abundant quartz clasts and veins, with common pyrite along the contacts and disseminated throughout the intrusive. At 305m, multiple 2-10cm-wide, molybdenite-bearing syenite dykes were intersected, associated with intense, pervasive propylitic alteration of the surrounding monzodiorite intrusive. From 350m, sodic-calcic alteration became dominant, indicating zonation toward distal alteration and the hole was ended at 419.1m.
Previous explorers recognised the Cu-Au potential of this tenure; however, Target T55 was never drill-tested. The exploration undertaken by Altitude in 2025, including geophysics and drilling, is the first field-based exploration work of any kind on this tenement.
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EP02: Copper Gold Porphyry
In the latest episode of the Altitude Minerals Podcast, Managing Director Duncan Chessell is in conversation with world-leading geochemist and in-house porphyry expert Professor Bruce Schaefer to explore these elusive and valuable mineral systems, which account for roughly three-quarters of the world’s copper and a fifth of its gold.
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Drill permit issued and drilling rig contracted for 2,300m RC program to test three highest priority Pipe Targets