SAN BERNARDINO, CA - Dateline Resources Limited (ASX: DTR) (OTCQB: DTREF) (FSE: YE1) (Dateline or the Company) is pleased to announce two new broad gold intersections from drill testing of the northeast extension at the North Pit at Colosseum.
The Colosseum Gold-REE Project is located in San Bernardino County, California, with the gold Bankable Feasibility Study recently completed.
Drillhole CM26-42 was drilled further to the northeast than previous holes, extending the mineralized zone further to the north and at depth. Drillhole CM25-41 was extended from 149.6m to 437m following positive results in 2025, increasing the mineralized zone by a further 140m downhole.
Highlights
North Pit NE Extension Confirmed: Drilling has intersected broad zones of mineralisation outside the mineral resource, increasing the potential of the bulk mining underground target: CM25-41 - 287.3m @ 1.05g/t Au from 0m, including 17.7m @ 6.13g/t Au from 19.2m
CM26-42 - 214m @ 1.06g/t Au from 0m, including 87.9m @ 1.59g/t Au from 12.2m
Mineralisation Extends Beyond Mineral Resource Envelope: The new drilling extends several hundred metres beyond the Mineral Resource envelope, demonstrating upside potential.
Additional Drill Rig to Continue Gold Drilling: Two rigs are targeting rare earth mineralisation at Colosseum via an expanded 18 hole program with a third, Company-owned rig, being recommissioned to allow gold extensions to be tested in parallel.
REE Samples at Assay Lab: To date, nearly 3,000 metres of rare earth focused diamond drilling has been completed, with holes drilled to up to 745m below surface.
High Density Rocks Correlate with Gravity Anomalies: Specific gravity (SG) analysis of REE drilling indicates high SG readings of greater than 2.8g/cm3, in line with density readings from Mountain Pass carbonatites and well above the 2.65g/cm3 in the breccia pipes.
Dateline's Managing Director, Stephen Baghdadi, commented: 'Gold mineralization at the Colosseum North Pit continues to extend to the northeast and these latest drill intersections again highlight the robust nature of the deposit.
'These broad gold intersections highlight the potential for the definition of an underground deposit at Colosseum that could be exploited following the completion of open pit mining.
'Based on the positive indications so far, the rare earth drilling program has now been expanded to 18 holes. The high-density rocks are an encouraging indicator that we are on the right track.'
Colosseum North Pit NE Gold Extensions
Drilling in late 2025 identified a zone in the North Pit at Colosseum demonstrating broad zones of consistent gold mineralization. Previous intercepts in the area included 149.65m @ 1.39g/t Au in CM25-41, 295.64m @ 1.04g/t Au in RC25-035 and 105.15m @ 1.24g/t Au in RC25-037.
As CM25-41 ended in mineralization, it was subsequently re-entered and extended to 437 metres. The mineralized zone was extended by a further 140 metres to 287.3 metres. The overall intersection is 287.3m @ 1.05g/t Au, with a high-grade component of 17.7m @ 6.13g/t Au.
CM26-42 was designed to follow up on the 2025 successes to the northeast of the North Pit and to define the true extents of the breccia pipe. It was designed at 47 degrees true north at a dip of -45 degrees. The hole defined the breccia pipe host lithology out to 292 metres down hole.
CM26-42 results were recently returned showing 214m @ 1.06g/t Au of continuous mineralization, including a higher-grade component of 87.9m @ 1.59g/t Au. Mineralization in the NE Extension remains open at depth and further drilling to define the extents of the breccia pipe and gold mineralization is ongoing.
Contact:
Stephen Baghdadi
Tel: +61 2 9375 2353
Andrew Rowell
Tel: +61 400 466 226
Email: a.rowell@dtraux.com
Web: www.datelineresources.com.au
About Dateline Resources Limited
Dateline Resources Limited (ASX:DTR)(OTCQB:DTREF)(FSE:YE1) is an Australian company focused on mining and exploration in North America. The Company owns 100% of the Colosseum Gold-REE Project in California.
The Colosseum Gold Mine is located in the Walker Lane Trend in East San Bernardino County, California and is located 10km north of Mountain Pass rare earth mine. Drill testing the REE potential at Colosseum has commenced.
On 11 May 2026, Dateline announced that the BFS economics for the Colosseum Gold Project generated a pre-tax NPV5 of US$785 million and a pre-tax IRR of 49.5% using a gold price of US$4,200/oz.
Dateline has also acquired the high-grade Argos Strontium Project, also located in San Bernadino County, California. Argos is reportedly the largest strontium deposit in the U.S. with previous celestite production grading 95%+ SrSO4.
In March 2026, Dateline consolidated the Music Valley Heavy Rare Earth Project in Riverside and San Bernardino Counties, California. The region has known HREE mineralisation from USGS rock chip sampling, however it has not been subjected to modern exploration techniques.
Forward-Looking Statements
This announcement may contain 'forward-looking statements' concerning Dateline Resources that are subject to risks and uncertainties. Generally, the words 'will', 'may', 'should', 'continue', 'believes', 'expects', 'intends', 'anticipates' or similar expressions identify forward-looking statements. These forward-looking statements involve risks and uncertainties that could cause actual results to differ materially from those expressed in the forward-looking statements. Many of these risks and uncertainties relate to factors that are beyond Dateline Resources' ability to control or estimate precisely, such as future market conditions, changes in regulatory environment and the behavior of other market participants. Dateline Resources cannot give any assurance that such forward-looking statements will prove to have been correct. The reader is cautioned not to place undue reliance on these forward-looking statements. Dateline Resources assumes no obligation and does not undertake any obligation to update or revise publicly any of the forward-looking statements set out herein, whether as a result of new information, future events or otherwise, except to the extent legally required.
(C) 2026 Electronic News Publishing, source ENP Newswire