Dateline Returns Wide Gold Intercepts at Colosseum

SAN BERNARDINO, CALIFORNIA / ACCESS Newswire / November 18, 2025 / Dateline Resources Limited (ASX:DTR)(OTCQB:DTREF)(FSE:YE1) is pleased to announce that recent drilling at its 100%-owned Colosseum Gold and Rare Earth Element (REE) Project in San Bernardino County, California has returned encouraging gold assay results that align with the Company's expectations and confirm the continuity of mineralisation within the existing open-pit mineral resource. These results strongly support the Company's strategy to convert Inferred Mineral Resources to the higher confidence Measured and Indicated categories, thereby upgrading the JORC-2012 mineral resource as part of the ongoing feasibility work.

Highlights

• Strong gold intercepts from infill drillingconfirm the continuity of mineralisation at depth:

  • RC25-020 returned 85.34m @ 1.33 g/t Au (beneath the existing pit) and,

  • CM25-19 returned 61.26m @ 1.18 g/t Au (partial result; remaining assays pending),

• Assays received in line with expectations and demonstrate consistent grades over broad intervals, supporting the geological model.

• Expanded M&I mineral resource to strengthen Feasibility Study: A larger high-confidence (M&I) resource base will underpin the Bankable Feasibility Study (BFS), enhancing mine design and economic robustness.

The standout drilling intercepts include 85.34 metres at 1.33 g/t Aufrom RC25-020, a reverse-circulation hole drilled beneath the current pit floor, and 61.26 metres at 1.18 g/t Aufrom CM25-19 (a diamond core hole for which assays are still pending beyond this interval). Hole RC25-020's long intercept of consistent gold grades indicates a continuation of the gold mineralisation below the mined pit, extending the known mineralised envelope at depth. Hole CM25-19, an infill hole targeting a previously sparsely drilled zone, has already delivered a substantial gold interval in its upper section.

The breadth and grade of these intersections are comparable to the deposit's average mineral resource grade, reinforcing confidence that the geological model is accurate and that gold mineralisation persists as predicted.

Foto: Accesswire

Figure 1: Cross-section of the Colosseum deposit illustrating the existing open pit outline and gold mineralized breccia pipe (blue modelled mineral resource zones). The approximate positions of key new drill intercepts (e.g., RC25-020 and CM25-19) are highlighted below the current pit. These results demonstrate the extension of gold mineralization at depth beneath the pit, supporting the planned upgrade of Inferred resources to higher-confidence categories.