Highlights

  • Infill drilling intersected broad gold intervals beneath the existing Colosseum open pit.
  • Assay results aligned with the current geological model and grade distribution.
  • Program aimed at upgrading Inferred resources to Measured and Indicated categories for BFS.

Dateline Resources Limited (ASX:DTR) has released amended results from its Bankable Feasibility Study (BFS) drilling program at the Colosseum Gold and Rare Earth Element Project in San Bernardino County, California. The amended announcement includes a plan view of drillhole locations and section layouts, along with a detailed table of results.

The drilling program focused on infill work within the existing open-pit resource area to assess mineralisation continuity at depth and to support a planned mineral resource upgrade under the JORC 2012 Code.

Key Intercepts and Assay Results
Recent reverse circulation and diamond drilling returned extended gold intersections beginning at surface. Hole RC25-020 intersected 85.34 metres grading 1.33 g/t Au from 0 metres, located beneath the current pit floor. Another hole, CM25-19, returned 61.26 metres at 1.18 g/t Au from surface, with assays pending for deeper sections of the hole.

According to the company, the reported grades and thicknesses are comparable to the average grade of the existing mineral resource. The intercepts indicate continuity of gold mineralisation below the mined pit area and within zones that previously had limited drill coverage.

Resource Upgrade Focus
The Colosseum Gold deposit currently hosts a JORC 2012-compliant Mineral Resource Estimate of 27.1 million tonnes at 1.26 g/t Au for 1.1 million ounces of gold. Approximately 67% of the resource is classified as Measured and Indicated, with the remaining portion in the Inferred category.

The completed infill drilling campaign targeted areas of Inferred mineralisation with wider drill spacing. Results from the latest batch of assays indicate grade consistency across broad intervals, which may support reclassification to higher-confidence resource categories during the upcoming resource update.

Implications for Feasibility Work
The expanded Measured and Indicated resource base is intended to be used in ongoing BFS activities, including mine design and economic assessments. The company noted that the drilling results fit within the existing geological model and confirm predicted mineralisation trends.

Figures released with the amended announcement illustrate drillhole positions relative to the open pit and modelled mineralised zones, showing extensions of gold mineralisation beneath the pit shell.

Share Price Snapshot
DTR was trading 7.01% higher at AUD 0.305 per share as of 28 November 2025.