Colosseum’s Gold Resource Could Grow Significantly as New Targets and Depths Emerge

Expanding the Gold Footprint at Colosseum

Dateline Resources Limited (ASX, DTR) has announced a significant expansion of its exploration potential at the Colosseum Gold-Rare Earth Element (REE) Project in California. Leveraging a recently completed 3D magneto-telluric (MT) survey integrated with detailed gravity data, the company has delineated six new high-priority breccia pipe targets that mirror the geophysical characteristics of the known gold-bearing structures underpinning the existing 1.1 million ounce JORC-compliant resource.

Geophysical Signatures Confirm Prospectivity

The new targets exhibit coincident gravity lows and low resistivity anomalies; hallmarks of the mineralised breccia pipes already defined at Colosseum. This consistency in geophysical response bolsters confidence that these anomalies represent extensions of the same style of mineralisation, significantly enhancing the project's exploration upside. Notably, four of the six new targets are comparable in size or larger than the known breccia pipes, suggesting substantial potential for resource growth.

Depth Extensions Signal Further Opportunity

Beyond surface targets, the MT survey reveals that the existing breccia pipes remain open at depth, extending at least 300 metres below the deepest historical drilling. Given that over 1.4 million ounces of gold have been defined within the upper 250 metres of these pipes, this vertical extension could translate into a meaningful increase in contained gold ounces if mineralisation persists at depth.

Strategic Drilling Program to Test Targets

Dateline plans to commence systematic drilling from September, deploying two rigs to simultaneously test the new breccia pipe targets and extend known mineralisation at depth. This dual approach aims to accelerate resource growth while advancing rare earth element exploration activities in parallel. The integration of multiple datasets; including pending geochemical results and a forthcoming 3D inversion model using ModEM software; will refine targeting and enhance the efficiency of the drill program.

Robust Project Economics Underpin Confidence

The Colosseum Project boasts strong economics, with a reported net present value of US$550 million and an internal rate of return of 61%, based on a gold price of US$2,900 per ounce. Situated less than 10 kilometres from the Mountain Pass Rare Earth mine, the project also holds promising rare earth element potential, adding a valuable dimension to its long-term outlook.

Dateline’s Managing Director, Stephen Baghdadi, emphasised the significance of the integrated geophysical and geochemical approach, stating that the new targets and depth extensions could substantially increase the gold endowment at Colosseum. With drilling imminent, the market will be watching closely for assay results that could reshape the project’s resource profile.