Hyperion Brownsfields Diamond Drilling R18 EL 9250

Abstract

Two HQ diamond drill holes (HYDD25001 and HYDD25002), totalling 602.8m, were completed at the Hyperion Gold Deposit on EL 9250 as part of the Round 18 Northern Territory Government Resourcing the Territory collaborative program. The program was designed to test down-dip and along-strike extensions of mineralisation within the Seuss and Tethys lodes, improve geological confidence in the structural and stratigraphic framework of the deposit, and address key knowledge gaps underpinning future resource growth. Drilling successfully intersected mineralisation within the Seuss Lode, including 42.5m @ 1.2g/t Au from 60m (ETW 27.5m) and 4m @ 2.7g/t Au from 50m in HYDD25001, confirming continuity of the structurally controlled mineralised corridor. A narrower intersection of 0.55m @ 1.4g/t Au was returned from 323.6m in HYDD25002 within the Tethys structural position. While down-dip extensions of highgrade Tethys mineralisation were not strongly developed in these holes, anomalous gold associated with quartz-pyrite-arsenopyrite veining confirms the persistence of the mineralised system at depth. Diamond core provided high-quality oriented structural, lithological and alteration data, significantly improving understanding of the relationship between Mount Charles Formation dolerite, interflow sediments and structurally focused quartz-carbonate veining. Mineralisation is interpreted as structurally controlled, associated with multi-phase brittle deformation and repeated hydrothermal fluid ingress within the Suplejack structural corridor. Sulphide assemblages are dominated by disseminated pyrite with local arsenopyrite, spatially associated with increased vein density and sericite-carbonate alteration. Downhole wireline logging (gamma, density, acoustic and optical televiewer) successfully characterised vein orientation, structural geometry and lithological contrasts, providing a cost-effective dataset to refine the geological model. Integration of structural measurements, lithogeochemistry and geophysical responses will enhance targeting efficiency and guide future infill and extensional drilling aimed at upgrading and expanding the existing Hyperion Mineral Resource. Overall, the program achieved its primary objective of improving geological confidence in the Hyperion mineralised system and provides a strong technical foundation for deeper targeting and potential resource growth within the Tanami North Project.