American Marconi Wireless News - Rare Earth Targets Refined as IP, MT, Radiometric and Geological Data Converge at Colosseum Project

Highlights

• Elevated chargeability zoneshave been identified in preliminary IP results at both shallow and deeper levels.

• Spatially coincidentIP chargeability anomalies with magneto telluric (MT) conductivity features and a regional USGS radiometric thorium signature, indicating convergence of multiple independent geophysical datasets.

• Potential link to fault structures - Geological mapping has identified a north west trending regional fault zone coincident with these geophysical anomalies

• IP data are currently being interpretedby Mitre Geophysics and will be integrated with existing MT and radiometric datasets to refine gold and rare earth element (REE) drill targets.

• Drill planningwill prioritize areas of geophysical convergence as part of an expanded, deeper drilling program.

Dateline's Managing Director, Stephen Baghdadi, commented:

"The data supports the theory of a large mineral system with deep structural and sulfide-hosted features that may reflect mineralizing plumbing beyond near-surface ore zones."

Exploration Update - Geophysical Integration and Target Refinement

During the December quarter, Dateline completed a five-line induced polarization (IP) survey across the Colosseum Project area using a pole-dipole configuration and 100 m dipole spacing, totaling approximately 13 line-kilometers. The IP survey was designed to identify chargeable responses potentially associated with sulfide development and deeper structural features previously interpreted from MT data and regional radiometric datasets. There are two northern lines targeting the known gold and fenite mineralisation and three southern lines targeting conductivity features interpreted from MT inversion.

Preliminary assessment of the 2D inversion of IP data on the southern three lines has identified zones of elevated chargeability at both shallow and deeper levels. Infill gravity and aeromagnetic surveys have been commissioned to help further refine these targets.

Figure 1: IP survey lines with preliminary shallow and deep anomalies shown with magneto-telluric conductivity high anomalies and USGS radiometric (Th) survey image

Importantly, these deeper IP chargeability anomalies show spatial coincidence with deep MT conductivity features, a regional radiometric trend defined by USGS thorium data and a mapped fault zone. This convergence of mapped geology and independent geophysical datasets is considered technically encouraging and suggests the presence of structurally controlled, altered and potentially sulfide-bearing zones at depth. Published studies confirm the Sulphide Queen carbonatite that is being mined at the nearby Mountain Pass REE mine, hosts chargeable sulfide minerals including pyrite, chalcopyrite, tetrahedrite and copper sulfides, providing a relevant analogue when considering the possible sources of chargeability within the Colosseum system.

Integrated interpretation indicates the Colosseum mineral system may comprise multiple near-surface features that potentially link into broader, more continuous features at depth.

The IP dataset is currently undergoing detailed inversion and interpretation by Mitre Geophysics and will be integrated with existing MT and radiometric data to further refine drill targeting across both gold- and REE-focused structural corridors. Drill planning will prioritize areas where multiple geophysical datasets converge, with the objective of developing a focused and well-constrained drilling program.

Further updates will be provided as interpretation progresses and drilling results become available.

This press release has been authorized for release by the Board of Dateline Resources Limited.

For more information, please contact:

Stephen Baghdadi
Managing Director
+61 2 9375 2353

Andrew Rowell
Corporate & Investor Relations Manager
+61 400 466 226
[email protected]
www.datelineresources.com.au

Follow Dateline on socials:
X - @Dateline_DTR
Truth Social - @dateline_resources
LinkedIn - dateline-resources
YouTube - @dateline.resources

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. On 6 June 2024, the Company announced to the ASX that the Colosseum Gold mine has a JORC-2012 compliant Mineral Resource estimate of 27.1Mt @ 1.26g/t Au for 1.1Moz. Of the total Mineral Resource, 455koz @ 1.47/t Au (41%) are classified as Measured, 281koz @1.21g/t Au (26%) as Indicated and 364koz @ 1.10g/t Au (33%) as Inferred.

On 23 May 2025, Dateline announced that updated economics for the Colosseum Gold Project generated an NPV6.5 of US$550 million and an IRR of 61% using a gold price of US$2,900/oz.

The Colosseum is located less than 10km north of the Mountain Pass Rare Earth mine. Planning has commenced on drill testing the REE potential at Colosseum.

Dateline also owns 100% of the high-grade Argos Strontium Project, also located in San Bernardino County, California. Argos is reportedly the largest strontium deposit in the U.S. with previous celestite production grading 95%+ SrSO₄.

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.

Competent Person Statement

Sample preparation and any exploration information in this announcement is based upon work reviewed by Mr. Greg Hall who is a Chartered Professional of the Australasian Institute of Mining and Metallurgy (CP-IMM). Mr. Hall has sufficient experience that is relevant to the style of mineralization and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the 2012 Edition of the "Australasian Code for Reporting Exploration Results, Mineral Resources and Ore Reserves" (JORC Code). Mr. Hall is a Non-Executive Director of Dateline Resources Limited and consents to the inclusion in the report of the matters based on this information in the form and context in which it appears.

Company Confirmations

The Company confirms it is not aware of any new information or data that materially affects the information included in the announcements dated 23 October 2024 with regard to the Colosseum MRE and 23 May 2025 with regard to Colosseum Project Economics. Similarly, the Company confirms that all material assumptions and technical parameters underpinning the estimates and the forecast financial information referred to in those previous announcements continue to apply and have not materially changed.

SOURCE: Dateline Resources Limited

View the original press release on ACCESS Newswire

O.Johnson--AMWN