Final Report for Viva Resources Pty. Ltd. 2025 NTGS Geophysics and Drilling Collaboration Funding Alligator River Project

Abstract

Viva Resources Pty Ltd (100% subsidiary of Deep Yellow Ltd) explores for unconformity-style uranium mineralisation in the Wellington Range (EL 5893), King River (EL 25064 and EL 25065), and Waidaboonar (EL 24017 and EL 27059) tenements in Arnhem Land. Exploration activities surrounding the Condor prospect area have been dormant since 2016. Viva Resources applied to the NTGS for funding from Round 18 of its Geophysics and Drilling Collaborations Program to complete a reflection seismic survey within the prospect area. On June 3 2025, Viva Resources was notified that funding of up to $100,000 had been granted to complete a seismic survey and data processing at the Condor prospect. The acquisition of 4 lines of reflection seismic, totalling 24.9km, started on October 6 and finished on October 12. Following the acquisition of the data, the processing workflow was finalised with a final report in March 2026. This seismic survey aimed to map the topography of the Cretaceous cover sequence above the basement lithologies of the Archean Nanambu Complex and Paleoproterozoic Cahill Formation. Further goals include identifying faults within the basement lithologies and the contact between the Archean and the overlying Proterozoic. The Condor prospect's geological setting is similar to that of the world-class Ranger and Jabiluka deposits, which represent high-tonnage, unconformity-related uranium deposits. These deposits are hosted by strongly sheared metasedimentary rocks, including graphitic pelite, calcsilicate, marble, and magnetite-bearing pelite, all of which are part of the Paleoproterozoic Cahill Formation. These deposits have a strong spatial correlation with the Neoarchean/Paleoproterozoic contact (i.e., uranium mineralisation typically occurs within 2 km of that contact). Crosscutting faults play an important role in focusing fluid flow and mixing, resulting in structural compartmentalisation and favouring uranium mineralisation. Key outcomes of the seismic survey are: Very high-quality data with low noise levels; Ability to map details within the search space for unconformity-related uranium deposits of ca 1.5km (vertical); Detailed mapping of the interphase between basement lithologies and the Cretaceous cover; Ability to interpret crosscutting faults. Data from this survey will support the interpretation of potential field data and drilling results to identify drill targets in future drilling programs.