GDC1700004 Pathfinader 38 Drilling Completion Report

Abstract

This report describes the implementation, results and interpretation of a diamond drilling program conducted over the Pathfinder 38 anomaly, a coincident magnetic-gravity anomaly located on EL 24541. The program was granted co-funding from the Northern Territory Government as part of Round 17 Geophysics and Drilling Collaboration (2024). The Rover Project is located approximately 100km west-southwest of the Tennant Creek township comprising seven granted tenements that fall within aboriginal freehold lands of the Karlantijpa South Land Trust and Karlantijpa North Land Trust. The project area is considered prospective for copper and gold and base metals mineralisation associated with Iron Oxide Copper Gold (IOCG) mineralising systems. GDC1700004 Pathfinder 38 drilling program was designed to test a coincident magnetic-gravity anomaly for IOCG mineralisation. In addition, drilling extend the depth of known basement geology in the Pathfinder area to at least 500m and will cover an untested geological trend as interpreted from magnetic interpretation thereby improving the understanding of the Rover mineral field stratigraphy. The original proposal was to target Pathfinder 35, however additional information in the form of passive seismic ANT modelling and incorporating remanent magnetism into magnetic forward models indicated the magnetic source was too deep to be a viable exploration target. A variation request was made to change the target to the Pathfinder 38 anomaly and was granted on the 3rd of April 2025. The drill hole 25P38D001 was collared on the 22nd April and completed on the 1st May 2025 for 616.05m down hole. Alteration associated IOCG mineralisation was observed in the core recovered and copper enrichment was identified from laboratory analysis. Occurrence of chalcopyrite associated with breccia veining in the lower Montejinni Limestone where copper assays of up to 0.3% were recorded. This mineralisation style indicates that fluids have possibly re-mobilised primary copper mineralisation, possibly via re-activated structures within the basement. A zone of distal silica-hematite alteration was observed between 253m and 295m indicating further mineralisation may occur to the north of the drillhole. A zone of strong magnetite with pyrite, replacement of jasper in a parasitic fold between 395.35 and 396.2m (same structural setting as Rover 1 on a micro scale). Development of chlorite alteration with weakly disseminated magnetite and elevated copper up to 30 times background (max 770ppm) was observed between 580.9m and 612.35m down hole. The source of the magnetic anomaly has not been explained by the geology intersected. Further work on the target will involve follow-up down hole magnetic survey in conjunction with additional passive seismic surveys to constrain the magnetic source for future drill targeting.