Author: Dateline Resources Limited

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.

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.

The current JORC-2012 Mineral Resource for the Colosseum Gold deposit stands at 27.1 million tonnes @ 1.26 g/t Au for 1.1 million ounces of gold. Approximately 67% of this resource is classified as Measured and Indicated, with the remaining 33% classified as Inferred. The completed infill drilling program focused on upgrading the Inferred resource by increasing drill density in those areas and confirming grade continuity. The latest batch of results provides clear evidence that a significant portion of the previously Inferred material can be elevated to higher confidence categories, as the intercepted grades and thicknesses are consistent with the current mineral resource model.

In summary, the latest drill results from Colosseum are in line with expectations and confirm the robustness of the geological model. They substantiate the Company’s approach to upgrade the mineral resource classification, thereby increasing the proportion of gold ounces in the Measured and Indicated categories. This will provide a stronger foundation for mine development plans and improve the quality of the BFS.

Dateline will continue to update shareholders as additional assay results are received and as the JORC mineral resource update process progresses. The Company is confident that the ongoing drilling will add tangible value to the Colosseum Gold-REE Project by enhancing the mineral resource base and de-risking the path to production.

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
a.rowell@dtraux.com
www.datelineresources.com.au

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

About Dateline Resources Limited

Dateline Resources Limited (ASX:DTR)(OTCQB:DTREF)(FSE:YE1.F) 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 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.

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

BFS Drill Program Nearly Complete –

Release is correcting the image provided for Figure 2

SAN BERNARDINO, CALIFORNIA / ACCESS Newswire / October 27, 2025 / Dateline Resources Limited (ASX:DTR)(OTCQB:DTREF)(FSE:YE1) (Dateline or the Company) is pleased to provide an update on the drilling activities underway at its 100%-owned Colosseum Gold-REE Project in California, USA.

Three drill rigs are currently operating on site, one diamond rig and two reverse circulation (RC) rigs and until recently, the program was supported by an additional sonic rig that has now completed its tailings stability work and has been demobilised.

The current drilling phase is focused on compact infill, extensional, geotechnical, and tailings stability holes as part of the Bankable Feasibility Study (BFS). The broader program will shortly transition to testing several newly defined, high-priority gold and rare earth targets identified from recent geophysical and geochemical work across the Colosseum system.

Highlights

• BFS Drilling: The compact BFS drill program of 32 holes for 4,257 metres (13,968 feet) is 67% complete with an estimated end date of November 7, 2025.

• Stockpile Drilling: Approximately 1Mt of historical stockpiles grading ~1 g/t Au will be RC drilled to confirm grade continuity and support inclusion in the mine plan, potentially adding already mined ~30,000oz of gold to the feasibility inventory.

• Tailings Stability Drilling: A sonic drilling program over the existing tailings storage facility was completed, confirming the foundation is stable and suitable for additional lifts as part of the planned development.

• Exploration Targets: The major phase of the drilling campaign will focus on newly defined gold and rare earth targets, with both programs to be drilled concurrently. Drilling will begin on the high-priority gold breccia pipe targets (Targets 1, 5 and 6) alongside the 2200N REE target, the first of three defined anomalies to be tested.

Dateline’s Managing Director, Stephen Baghdadi, commented:“Having multiple rigs on site has allowed us to accelerate the program so we can focus our efforts sooner on the new gold and rare earth targets. With over 1,400 samples already at the lab, we look forward to reporting the results as they become available and are analysed.

“Our geology team is eager to commence drilling the new gold and REE targets in early November.”

BFS Drill Program Status

Infill and Extensional Program

The Scoping Study outlined 16.6 Mt of ore, with 81% classified as Measured and Indicated and the remaining 19% as Inferred. The current drill program is designed to infill these Inferred areas and support upgrades to Indicated or Measured categories, providing greater confidence in mine scheduling and production planning.

The infill component comprises 32 holes for 4,257 metres (13,968 feet) and is now 67% complete. Samples from the completed holes have been dispatched to ALS Reno for analysis.

Stockpile Drilling

When Dateline acquired the Colosseum Project in 2021, it inherited an existing ore stockpile left on site following the suspension of operations in 1993. Historical mine records indicate the stockpile contains approximately 1Mt grading 1.0 g/t Au for an estimated 30,000 ounces of gold.

To date, Dateline’s work has focused on expanding the in-situ Mineral Resource, and the stockpile has not yet been drilled or included in the current mine plan. The Company now intends to complete reverse-circulation (RC) drilling to confirm the tonnes and grade of this material, enabling it to be incorporated into the development schedule.

This mined stockpile has the potential to be processed during the commissioning phase of the operation, providing an early source of mill feed, accelerating gold production, and enhancing overall project economics.

Tailings Stability Drilling

Dateline plans to reutilise the existing tailings storage facility (TSF) at Colosseum as part of the proposed mine development. The design involves filter pressing the tailings prior to deposition, allowing the material to be stacked dry on top of the existing facility. This approach enables water recirculation, significantly reducing overall water consumption and supporting construction of additional TSF lifts.

To confirm the suitability of this approach, a program of sonic drilling was completed across the TSF site. The recovered core was reviewed by the Company’s hydrogeological consultants, who have provided their findings to the BFS team. Results confirmed the foundation stability and suitability of the existing TSF for future use as a dry-stack tailings and waste rock facility.

New Target Drilling

The BFS drilling programs were prioritised for completion ahead of the new target testing, as they form part of the critical path for the Colosseum development timeline. With these programs now nearing completion, the focus is shifting to the next phase of drilling-testing the newly defined gold and rare earth element (REE) targets.

Dateline has ranked several high-priority targets for initial assessment, with Gold Targets 1, 5 and 6 and REE Target 2200N to be drilled first as part of the expanded exploration campaign.

This ASX announcement has been authorised for release by the Board of Dateline Resources Limited.

For more information, please contact:

Stephen Baghdadi Managing Director +61 2 9375 2353 www.datelineresources.com.au

Andrew Rowell Corporate & Investor Relations Manager +61 400 466 226 a.rowell@dtraux.com

Follow Dateline on socials:		@Dateline_DTR @dateline_resources 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 NPV_6.5 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 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.

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 behaviour 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

BFS Drill Program Nearly Complete –

SAN BERNARDINO, CALIFORNIA / ACCESS Newswire / October 27, 2025 / Dateline Resources Limited (ASX:DTR)(OTCQB:DTREF)(FSE:YE1) (Dateline or the Company) is pleased to provide an update on the drilling activities underway at its 100%-owned Colosseum Gold-REE Project in California, USA.

Three drill rigs are currently operating on site, one diamond rig and two reverse circulation (RC) rigs and until recently, the program was supported by an additional sonic rig that has now completed its tailings stability work and has been demobilised.

The current drilling phase is focused on compact infill, extensional, geotechnical, and tailings stability holes as part of the Bankable Feasibility Study (BFS). The broader program will shortly transition to testing several newly defined, high-priority gold and rare earth targets identified from recent geophysical and geochemical work across the Colosseum system.

Highlights

• BFS Drilling: The compact BFS drill program of 32 holes for 4,257 metres (13,968 feet) is 67% complete with an estimated end date of November 7, 2025.

• Stockpile Drilling: Approximately 1Mt of historical stockpiles grading ~1 g/t Au will be RC drilled to confirm grade continuity and support inclusion in the mine plan, potentially adding already mined ~30,000oz of gold to the feasibility inventory.

• Tailings Stability Drilling: A sonic drilling program over the existing tailings storage facility was completed, confirming the foundation is stable and suitable for additional lifts as part of the planned development.

• Exploration Targets: The major phase of the drilling campaign will focus on newly defined gold and rare earth targets, with both programs to be drilled concurrently. Drilling will begin on the high-priority gold breccia pipe targets (Targets 1, 5 and 6) alongside the 2200N REE target, the first of three defined anomalies to be tested.

Dateline’s Managing Director, Stephen Baghdadi, commented:“Having multiple rigs on site has allowed us to accelerate the program so we can focus our efforts sooner on the new gold and rare earth targets. With over 1,400 samples already at the lab, we look forward to reporting the results as they become available and are analysed.

“Our geology team is eager to commence drilling the new gold and REE targets in early November.”

BFS Drill Program Status

Infill and Extensional Program

The Scoping Study outlined 16.6 Mt of ore, with 81% classified as Measured and Indicated and the remaining 19% as Inferred. The current drill program is designed to infill these Inferred areas and support upgrades to Indicated or Measured categories, providing greater confidence in mine scheduling and production planning.

The infill component comprises 32 holes for 4,257 metres (13,968 feet) and is now 67% complete. Samples from the completed holes have been dispatched to ALS Reno for analysis.

Stockpile Drilling

When Dateline acquired the Colosseum Project in 2021, it inherited an existing ore stockpile left on site following the suspension of operations in 1993. Historical mine records indicate the stockpile contains approximately 1Mt grading 1.0 g/t Au for an estimated 30,000 ounces of gold.

To date, Dateline’s work has focused on expanding the in-situ Mineral Resource, and the stockpile has not yet been drilled or included in the current mine plan. The Company now intends to complete reverse-circulation (RC) drilling to confirm the tonnes and grade of this material, enabling it to be incorporated into the development schedule.

This mined stockpile has the potential to be processed during the commissioning phase of the operation, providing an early source of mill feed, accelerating gold production, and enhancing overall project economics.

Tailings Stability Drilling

Dateline plans to reutilise the existing tailings storage facility (TSF) at Colosseum as part of the proposed mine development. The design involves filter pressing the tailings prior to deposition, allowing the material to be stacked dry on top of the existing facility. This approach enables water recirculation, significantly reducing overall water consumption and supporting construction of additional TSF lifts.

To confirm the suitability of this approach, a program of sonic drilling was completed across the TSF site. The recovered core was reviewed by the Company’s hydrogeological consultants, who have provided their findings to the BFS team. Results confirmed the foundation stability and suitability of the existing TSF for future use as a dry-stack tailings and waste rock facility.

New Target Drilling

The BFS drilling programs were prioritised for completion ahead of the new target testing, as they form part of the critical path for the Colosseum development timeline. With these programs now nearing completion, the focus is shifting to the next phase of drilling-testing the newly defined gold and rare earth element (REE) targets.

Dateline has ranked several high-priority targets for initial assessment, with Gold Targets 1, 5 and 6 and REE Target 2200N to be drilled first as part of the expanded exploration campaign.

This ASX announcement has been authorised for release by the Board of Dateline Resources Limited.

For more information, please contact:

Stephen Baghdadi Managing Director +61 2 9375 2353 www.datelineresources.com.au

Andrew Rowell Corporate & Investor Relations Manager +61 400 466 226 a.rowell@dtraux.com

Follow Dateline on socials:		@Dateline_DTR @dateline_resources 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 NPV_6.5 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 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.

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 behaviour 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

Ranking of Targets Advances Colosseum Gold-REE Project

SAN BERNARDINO, CA / ACCESS Newswire / October 20, 2025 / Dateline Resources Limited (ASX:DTR)(OTCQB:DTREF)(FSE:YE1) (Dateline or the Company) is pleased to announce the completion of an independent geophysical assessment of the Colosseum Project in California, which has refined the ranking of six previously identified breccia pipe gold targets¹. The review, conducted by Dr. Kate Selway (Vox Geophysics), integrated a 3D magneto-telluric (MT) survey with detailed gravity data to evaluate each target’s resistivity and density anomalies. All six targets exhibit the coincident low-density (gravity low) and low-resistivity signatures characteristic of the known gold-bearing breccia pipes at Colosseum. Based on the strength, depth extent, and clarity of these geophysical anomalies, the targets have been ranked to guide upcoming drilling, with Target 1 emerging as the most robust prospect.

¹ASX Announcement 19 August 2025 – Six new gold breccia pipe targets art Colosseum

Highlights

• Target 1 – Highest Ranked Anomaly:Located just to the west of the current breccia pipes, Target 1 was identified as the strongest gold target due to a well-defined coincident gravity low and low-resistivity anomaly extending several hundred metres deep. Dr. Selway described Target 1 as “the most robust target” of the six.

• Target 5 – Extensive Anomaly:Target 5 features the most extensive conductive (low-resistivity) zone (

• Target 6 – Strong “Bullseye” Anomaly:Target 6 is a distinct 300m x 300m “bullseye” anomaly with a coincident surface gravity low and underlying resistivity low. Both signals show excellent continuity to ~700m depth. Dr. Selway noted the density and resistivity anomalies at 6 are closely co-located, enhancing confidence in this target’s prospectivity.

• Targets 2, 3, and 4:Collectively exhibit encouraging geophysical anomalies (coincident gravity lows and low-resistivity zones) indicative of potential breccia pipe systems, making them promising targets for further exploration.

• Data-Driven Exploration:The prioritisation by Dr. Selway reinforces Dateline’s exploration model by focusing on targets with the clearest coincident geophysical anomalies. All six targets will be further refined with the planned IP survey. This systematic approach is aimed at maximizing discovery success and expanding Colosseum’s 1.1 Moz gold mineral resource base.

Dateline’s Managing Director, Mr. Stephen Baghdadi, welcomed the independent findings, stating:“It is extremely encouraging to have targets ranked by someone of Dr. Selway’s calibre. This independent review not only boosts our confidence in the targets’ geological significance but also helps sharpen our drill prioritisation. As we close out the current infill drilling that is required for our feasibility study, we will immediately focus on the highest-ranking anomalies in the upcoming drill program, aiming to unlock Colosseum’s greater gold potential and continue building value for our shareholders.”

Geophysical Target Assessment and Ranking

Target 1 – West of South Pit (Top Rank):Approximately 250m by 250m in area, Target 1 lies west of the South Pit and is characterized by a strong overlapping gravity low and MT resistivity low. The geology in this area is interpreted to be dominated by felsite intrusives. Dr. Selway’s review highlighted a pronounced low-density anomaly situated between two low-resistivity zones (each “the most robust target.”

Target 5 – Southwestern Anomaly (High Rank):Target 5 is one of the largest and most intriguing targets defined by the survey. Spanning roughly 500m by 300m in the southwestern part of the tenement, Target 5 is marked by a broad gravity low coincident with a substantial low-resistivity anomaly. Notably, Target 5’s resistivity low is the most extensive in the entire survey area, persisting from near surface to the maximum modelled depth of approximately 900m. Dr. Selway reported a clear co-location of the density and resistivity anomalies at Target 5, with resistivity values below 500 Ω·m – a strong conductive signature that could indicate alteration and mineralisation. This large vertical continuity suggests an extensive breccia pipe or a related structural zone. Target 5 stands out as a compelling target due to the strength and size of its coincident anomalies. It ranks among the top priorities for drilling, as confirming a mineralised system at Target 5 could significantly expand the scale of the Colosseum project’s gold endowment. The planned drilling program will aim to test the core of this deep conductive zone.

Target 6 – Strong “Bullseye” (High Rank):Target 6 is a distinct circular anomaly (~300m by 300m) located south of the existing mineral resource area. It presents as a classic “bullseye” geophysical target, with a well-defined gravity low at surface directly above a low-resistivity MT anomaly. Both the density and resistivity lows at Target 6 show strong continuity down to roughly 700m depth, indicating substantial vertical extent. Dr. Selway’s analysis highlighted that Target 6’s gravity and resistivity anomalies are more closely co-located (overlapping in space) compared to some other targets. This tight overlap of low-density and low-resistivity signals is exactly the geophysical signature expected of a breccia pipe-hosted gold system, increasing confidence in Target 6’s prospectivity. Given its favourable “bullseye” signature and significant depth potential, Target 6 will be a key candidate for early drill testing. Success at Target 6 would reinforce the interpretation that multiple pipe-like structures remain undiscovered within 1.5 km of the known Colosseum orebodies.

Other Targets

Targets 2, 3 and 4 are deemed to be secondary targets to be followed up after drilling the higher ranked targets.

Target 2 – East of North Pit:Target 2 is a gravity low anomaly directly east of the North Pit, occurring over a zone of extremely low resistivity. In fact, the MT response at Targets 2 and 3 includes the lowest resistivity values recorded in the survey. This suggests a highly conductive zone at depth potentially linking Targets 2 and 3.

Target 3 – East of North Pit:Adjacent to Target 2, Target 3 covers part of the same broad low-resistivity zone and spans roughly 200-300m in extent. Together, Targets 2 and 3 appear as distinct gravity lows sitting above a shared conductive zone, possibly indicating they are connected at depth. The MT anomaly at Target 3 is also relatively low in and coincides with a gravity low. Dr. Selway observed that at Target 3, the two anomalies are adjacent rather than perfectly co-located. This spatial offset means the density low and resistivity low do not overlap entirely, which could imply a more complex geology. Despite this, Target 3’s sizeable low-resistivity area (the most pronounced in the survey, shared with Target 2) makes it a plausible breccia pipe candidate. Both Target 2 and Target 3 will benefit from further validation. Drilling at Target 3 will likely be considered after the top targets, or in conjunction with Target 2, to test the potential of this conductive zone to host gold mineralisation.

Target 4 – South of South Pit:Target 4 is an elongate, northwest-trending anomaly (~400m by 300m) situated south of the South Pit. It exhibits a coincident gravity low and resistivity low signature that is strongest near surface but appears to dissipate around 200m depth. This shallower geophysical expression suggested Target 4 might represent a relatively shallow breccia pipe.

Path Forward

With two rigs already drilling on site, and a third rig being set up to commence drilling, Dateline is now planning to systematically test the highest-ranked gold targets alongside the project’s rare earth element (REE) targets. The top ranked gold and REE targets are slated for initial drillholes, aimed at intercepting the interpreted structures at depth. Other targets will likely be addressed at a later stage. This phased strategy balances immediate high-impact exploration with prudent risk management.

The Company remains positive that the refined targeting and prioritisation will translate into new discoveries and mineral resource growth. Further updates will be provided as drilling progresses and additional data become available.

This ASX announcement has been authorised for release by the Board of Dateline Resources Limited.

For more information, please contact:

Stephen Baghdadi Managing Director +61 2 9375 2353 www.datelineresources.com.au

Andrew Rowell Corporate & Investor Relations Manager +61 400 466 226 a.rowell@dtraux.com

Follow Dateline on socials:		@Dateline_DTR @dateline_resources 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 NPV_6.5 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 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.

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 behaviour 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.

View the original press release on ACCESS Newswire

Strengthening Domestic Critical Mineral Supply

SAN BERNARDINO, CALIFORNIA / ACCESS Newswire / September 24, 2025 / Dateline Resources Limited (ASX:DTR)(OTCQB:DTREF)(FSE:YE1) is pleased to announce that second ModEM 3D magneto-telluric (MT) inversion result has also confirmed the high-priority REE drill target on line 2200N at its 100%-owned Colosseum Gold-REE Project, California. This target was originally identified in August using Viridien’s RLM-3D inversion model. The latest modelling, an independent inversion by Dr. Kate Selway of Vox Geophysics using the open-source ModEM code, produced a very similar 3D resistivity model, validating the earlier interpretation.

Highlights

• ModEM Model Review: A second 3D MT inversion model has confirmed the high priority 2200N REE target, located just north of the historical gold open pits.

• Model Consistency: The RLM-3D and new ModEM inversions produced resistivity models with very similar features, providing strong cross-validation of the target.

• Deep, Coincident Anomaly: In both models, a resistive region extends to at least ~1,000 m depth below the surface, spatially coincident with outcropping REE bearing fenite dykes (consistent with an REE bearing carbonatite source).

• Upcoming Drilling:Majors Drilling will mobilise additional rigs in coming weeks to expedite testing of this high-priority REE drill target.

• Parallel Validation Underway for Gold Targets: A second-party review is in progress to validate the six new gold breccia pipe targets identified in August 2025, strengthening confidence ahead of drill testing.

In both models, a prominent resistive anomaly is observed on line 2200N, extending from ~1,000 m depth up to surface and coincident with surface fenite dykes. Notably, this resistive body’s alignment with fenite (an alteration typically haloing carbonatite intrusions) is consistent with a carbonatite source, indicating carbonatite-hosted potential for REE mineralisation at depth

Dateline’s Managing Director, Stephen Baghdadi, commented:

“This new modelling, conducted by two highly skilled groups, using different analysis software and inversion modelling methods have both confirmed the exciting 2200N rare earth target, we look forward to drill testing our new REE and gold targets and adding further value for shareholders.”

Magneto-Telluric Inversion Modelling

The MT survey data (167 stations on 14 lines) were reprocessed by Vox Geophysics using the ModEM inversion algorithm to generate a fresh 3D resistivity model for the Colosseum Project.

Figure 3: Plan view of Colosseum claim boundary showing MT survey lines and REE bearing fenite outcrops in black diamonds.

Dr. Selway, a globally recognized expert in magneto-telluric data analysis with over 20 years of experience, holds a PhD in MT methodologies and has conducted fieldwork across diverse regions, including Antarctica, Greenland, East Africa, Australia, and the United States. Her extensive academic background includes roles at prestigious institutions such as the University of Adelaide, Yale University, Lamont-Doherty Earth Observatory, and the University of Oslo, complemented by contributions to high-profile geophysical publications.

Dr Kate Selway, Managing Director of Vox Geophysics, noted: “The two independent RLM-3D and ModEM approaches, with independent data analysis and different inversion codes, have produced resistivity models with very similar features. This cross-validation between the two independent approaches provides confidence that features consistently imaged in both models are robust and reliable.”

This independent model closely mirrors the original RLM-3D model, confirming all major resistive and conductive features. Crucially, the east-west Line 2200N anomaly – previously highlighted as a zone of REE potential – appears virtually identical in both models. In each case, a broad high-resistivity zone (hundreds of metres across) rises from at least ~1 km depth to the near-surface, directly beneath outcrops of fenite dykes. The duplication of this feature by two independent inversion codes greatly reinforces confidence in its geologic significance. The spatial coincidence of a deep-seated resistive body with surface fenite alteration is a signature characteristic of carbonatite-centred REE systems, suggesting that the 2200N anomaly may represent a carbonatite intrusive source for REE mineralisation. This interpretation aligns with other geophysical evidence at Colosseum, where the 2200N target area also shows a gravity high and magnetic low pattern analogous to the nearby Mountain Pass carbonatite REE deposit (~10 km south).

Next Steps: Drilling and Exploration Strategy

Drill Testing: Dateline plans to commence drill testing of the new rare earth target on line 2200N (along with several new gold targets) in the upcoming December quarter. Diamond drilling is already underway at Colosseum, focused on infill and extensional holes in the existing gold mineral resource as part of a Bankable Feasibility Study (BFS). Drill rigs are being mobilised to site through September-October to accelerate the exploration program and fast-track the testing of newly defined targets. The 2200N anomaly, now supported by two independent 3D models and surface geological indicators, is regarded as a high-priority REE drill target and will be a key focus of the upcoming campaign.

Importantly, the area of the 2200N anomaly has seen no historical drilling. Past exploration at Colosseum was largely gold-focused and concentrated around the known breccia pipe gold outcrops, leaving the REE potential of the broader system underexplored. The newly defined 2200N target therefore represents a potential fresh discovery.

Broader Exploration Strategy: The validation of this REE target is in keeping with Dateline’s dual-track strategy at Colosseum of advancing the known gold deposit toward development while unlocking new value in the project’s rare earth and additional potential gold bearing breccia pipe targets. The Company’s rigorous approach to data collection, now bolstered by the latest 3D MT results, is designed to de-risk drill targeting and maximize the chance of discovery. Dateline’s technical team will incorporate the ModEM model insights into final drill planning for the REE targets.

MT Gold Target Review: In addition to the REE inversion validation, Dateline has initiated a secondary review of the gold-focused MT model. This review aims to independently validate the six high-priority breccia pipe targets announced in August 2025. Results from this validation will be disclosed to the market when completed and integrated into the final drill targeting model as Dateline prepares to test both gold and REE targets in the current campaign.

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
a.rowell@dtraux.com
www.datelineresources.com.au

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About Dateline Resources Limited

Dateline Resources Limited (ASX:DTR)(OTCQB:DTREF)(FSE:YE1.F) 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 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.

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