Dateline Resources Reveals Significant Colosseum Gold-REE Survey Insights
Dateline Resources (OTCQB:DTREF) has announced significant findings from a magnetotelluric (MT) geophysical survey at its 100%-owned Colosseum Gold-REE Project in California. The survey, completed on June 29, 2025, with 167 stations across a 200-meter line spacing, revealed geophysical signatures remarkably similar to the world-class Mountain Pass rare earth element deposit located 10 km south.
The survey identified a high-resistivity anomaly on Line 2200N, coinciding with REE-bearing fenite dykes and trachyte dykes. The project's geophysical profile mirrors Mountain Pass's characteristic anomalies: a relative gravity high, relative magnetic low, and moderate resistivity (70-120 Ω·m).
Concurrent geochemical sampling is 75% complete, with 916 of 1,200 samples collected. Initial assays from ALS Global Laboratories have confirmed anomalous REE concentrations, including cerium, lanthanum, and yttrium. The company expects to complete sampling by mid-July 2025, with full results anticipated later that month.
Dateline Resources (OTCQB:DTREF) ha annunciato risultati significativi da un'indagine geofisica magnetotellurica (MT) presso il suo progetto Colosseum Gold-REE in California, di proprietà al 100%. Il sondaggio, completato il 29 giugno 2025 con 167 stazioni su una griglia di 200 metri, ha rivelato segnali geofisici molto simili al giacimento di terre rare di classe mondiale Mountain Pass, situato a 10 km a sud.
L'indagine ha individuato un anomalia ad alta resistività sulla Linea 2200N, in corrispondenza di dossi fenitici ricchi di terre rare e di dossi trachitici. Il profilo geofisico del progetto rispecchia le anomalie caratteristiche di Mountain Pass: un picco relativo di gravità, un minimo magnetico relativo e una resistività moderata (70-120 Ω·m).
Il campionamento geochimico parallelo è completato al 75%, con 916 campioni raccolti su 1.200 previsti. Le prime analisi dei laboratori ALS Global hanno confermato concentrazioni anomale di terre rare, inclusi cerio, lantanio e ittrio. L'azienda prevede di terminare il campionamento entro metà luglio 2025, con i risultati completi attesi per la fine del mese.
Dateline Resources (OTCQB:DTREF) ha anunciado hallazgos significativos de una encuesta geofísica magnetotelúrica (MT) en su proyecto Colosseum Gold-REE en California, del que posee el 100%. La encuesta, completada el 29 de junio de 2025 con 167 estaciones distribuidas cada 200 metros, reveló firmas geofísicas notablemente similares al depósito de elementos de tierras raras de clase mundial Mountain Pass, ubicado a 10 km al sur.
La encuesta identificó una anomalía de alta resistividad en la Línea 2200N, coincidiendo con diques feníticos portadores de tierras raras y diques traquíticos. El perfil geofísico del proyecto refleja las características de Mountain Pass: un alto relativo de gravedad, un bajo relativo magnético y una resistividad moderada (70-120 Ω·m).
El muestreo geoquímico concurrente está completo en un 75%, con 916 de 1,200 muestras recolectadas. Los análisis iniciales del laboratorio ALS Global han confirmado concentraciones anómalas de tierras raras, incluyendo cerio, lantano y itrio. La compañía espera completar el muestreo para mediados de julio de 2025, con resultados completos previstos para finales de ese mes.
Dateline Resources (OTCQB:DTREF)는 캘리포니아에 위치한 100% 소유의 Colosseum Gold-REE 프로젝트에서 실시한 자기텔루릭(MT) 지구물리 조사에서 중요한 발견을 발표했습니다. 2025년 6월 29일에 완료된 이 조사는 200미터 간격으로 167개 측정 지점을 포함했으며, 10km 남쪽에 위치한 세계적 수준의 Mountain Pass 희토류 광상과 매우 유사한 지구물리적 신호를 밝혀냈습니다.
조사는 REE 함유 페나이트 다이크와 트라키트 다이크가 일치하는 2200N 라인에서 고저항성 이상 현상을 확인했습니다. 이 프로젝트의 지구물리 프로필은 Mountain Pass의 특징적인 이상 현상인 상대 중력 고점, 상대 자기 저점 및 중간 저항성(70-120 Ω·m)을 반영합니다.
동시에 진행 중인 지구화학 샘플링은 75% 완료되었으며, 1,200개 중 916개의 샘플이 수집되었습니다. ALS 글로벌 연구소의 초기 분석 결과는 세륨, 란탄, 이트륨 등 희토류 원소의 이상 농도를 확인했습니다. 회사는 2025년 7월 중순까지 샘플링을 완료하고, 그 달 말에 전체 결과를 발표할 예정입니다.
Dateline Resources (OTCQB:DTREF) a annoncé des résultats significatifs issus d'une enquête géophysique magnétotellurique (MT) sur son projet Colosseum Gold-REE en Californie, dont il détient 100 %. L'enquête, achevée le 29 juin 2025 avec 167 stations espacées de 200 mètres, a révélé des signatures géophysiques remarquablement similaires à celles du gisement mondial de terres rares de Mountain Pass, situé à 10 km au sud.
L'enquête a identifié une anomalie à haute résistivité sur la ligne 2200N, coïncidant avec des dykes de fénite porteurs de terres rares et des dykes de trachyte. Le profil géophysique du projet reflète les anomalies caractéristiques de Mountain Pass : un pic relatif de gravité, un creux magnétique relatif et une résistivité modérée (70-120 Ω·m).
Le prélèvement géochimique concomitant est achevé à 75 %, avec 916 échantillons collectés sur 1 200. Les premiers dosages des laboratoires ALS Global ont confirmé des concentrations anormales en terres rares, notamment en cérium, lanthane et yttrium. La société prévoit de terminer le prélèvement d'ici la mi-juillet 2025, avec des résultats complets attendus plus tard dans le mois.
Dateline Resources (OTCQB:DTREF) hat bedeutende Ergebnisse einer magnetotellurischen (MT) geophysikalischen Untersuchung auf seinem zu 100 % gehörenden Colosseum Gold-REE-Projekt in Kalifornien bekannt gegeben. Die Untersuchung, die am 29. Juni 2025 mit 167 Stationen im Abstand von 200 Metern abgeschlossen wurde, zeigte geophysikalische Signaturen, die bemerkenswert denen des weltbekannten Mountain Pass Seltene-Erden-Lagers 10 km südlich ähneln.
Die Untersuchung identifizierte eine hochresistive Anomalie auf der Linie 2200N, die mit REE-haltigen Fenit-Dyken und Trachyt-Dyken übereinstimmt. Das geophysikalische Profil des Projekts spiegelt die charakteristischen Anomalien von Mountain Pass wider: ein relatives Schwerehoch, ein relatives Magnetiktief und eine moderate Resistivität (70-120 Ω·m).
Die gleichzeitige geochemische Probenahme ist zu 75 % abgeschlossen, mit 916 von 1.200 gesammelten Proben. Erste Analysen der ALS Global Laboratories bestätigten anomale REE-Konzentrationen, darunter Cer, Lanthan und Yttrium. Das Unternehmen erwartet, die Probenahme bis Mitte Juli 2025 abzuschließen, mit vollständigen Ergebnissen, die später im Monat erwartet werden.
- None.
- Full geochemical sampling results not yet available
- 3D modeling and final interpretations still pending completion
Geophysics Survey Reveals Striking Similarities to World-Class Mountain Pass Rare Earth Deposit;
Geochemical Anomalies Bolster Exploration Potential
SAN BERNARDINO, CA / ACCESS Newswire / July 1, 2025 / Dateline Resources Limited (ASX:DTR)(OTCQB:DTREF) ("Dateline" or "the Company") is thrilled to announce the successful completion of a comprehensive magnetotelluric (MT) geophysical survey at its
Key Findings
Successful MT Survey Completion: The MT survey concluded on schedule, with data collected using advanced 100m inline and 100m crossline electric field dipoles, paired with horizontal (x,y) magnetic field sensors at every other site and vertical (z) sensors at
25% of sites. Overnight recordings of 14-16 hours per station, supported by a remote reference site 30-40 km away, ensured high-quality data. Rigorous QA/QC checks, including preliminary 1D and 2D inversion models, have validated the dataset's integrity for upcoming 3D modelling.High-Resistivity Anomaly on Line 2200N: Preliminary 2D resistivity sections reveal an anomalous resistivity zone on survey line 2200N, extending from depth to the surface. This anomaly is precisely coincident with mapped REE-bearing fenite dykes and trachyte dykes, suggesting a resistive intrusive body or alteration zone potentially linked to carbonatite systems.
Mountain Pass Analogue: The geophysical profile at Colosseum mirrors the Mountain Pass deposit's characteristic trio of anomalies: a relative gravity high, a relative magnetic low, and moderate resistivity (70-120 Ω·m). Reprocessed 2023 and 2024 gravity survey data, combined with regional magnetic data, show a gravity high and magnetic low in the fenite-bearing zone, reinforcing the Mountain Pass-like signature indicative of carbonatite-hosted REE mineralization.
Geochemical Sampling Progress: As of June 30, 2025, 916 of approximately 1,200 soil and rock samples have been collected on a 60-meter spaced grid across the claim block, representing
75% completion. Initial assays from the first batch, processed by ALS Global Laboratories in Reno, Nevada, using aqua regia super trace ICP-MS analysis, have detected anomalous REE values, including cerium, lanthanum, and yttrium, above background levels. The program is on track for completion by mid-July, with full results expected later that month.
Detailed Survey Insights
The preliminary 2D resistivity section for line 2200N highlights a near-surface high-resistivity anomaly directly overlying fenite and trachyte dykes, which are exposed in the Colosseum pit walls and mapped north and east of the breccia pipes. This spatial correlation suggests a deep-seated resistive body, potentially a carbonatite intrusion, associated with REE mineralization. Across other survey lines, distinct resistivity contrasts indicate clay-rich alteration zones (low resistivity), possibly linked to gold-bearing breccia pipes, and higher-resistivity zones that may reflect unaltered intrusive or silicified areas. These findings align with Dateline's goal of imaging deep structures and alteration zones, with all preliminary sections under review by the technical team.
Mountain Pass Geophysical Benchmark
The Mountain Pass deposit, operated by MP Materials, provides a proven geophysical template for Colosseum. According to USGS studies (Peacock et al., 2021), Mountain Pass's carbonatite orebody exhibits a dense, non-magnetic core surrounded by moderately resistive host rocks. At Colosseum, the fenite-bearing zone on line 2200N corresponds with a gravity high from the 2024 survey, a magnetic low from regional datasets, and the observed intermediate resistivity. This trifecta of anomalies, consistent with carbonatite REE systems, positions Colosseum as a high-potential exploration target. The Company is integrating these findings with historical data to refine the exploration model.
Geochemical Sampling Update
The geochemical program, initiated in mid-June 2025, involves systematic sampling across the entire claim block, with crews collecting 0.5 kg of material per sample using GPS-guided 60-meter spacing. Samples are dried, crushed, split, and pulverized at ALS Global, with assays targeting gold, silver, REEs, and pathfinder elements. The initial results, showing REE anomalies, are a critical early indicator of mineralization. Once all 1,200 samples are assayed, Dateline will generate geochemical anomaly maps to identify multi-element clusters, integrating these with geophysical data to prioritize drill targets.
Next Steps
Dateline is transitioning to the data integration and target definition phase, with the following planned activities:
3D MT Inversion Modelling: A full 3D resistivity model will be developed using dual inversion approaches. A Colorado-based multi-physics team will employ a proprietary 3D inversion code, while a Perth, Australia, team will use the ModEM MT inversion software. This dual approach, expected to be completed in a few weeks, will cross-validate results and enhance subsurface imaging.
Geochemical Completion: The remaining 284 samples will be collected and assayed by mid-July, with comprehensive interpretation to follow. Anomaly maps for cerium, lanthanum, yttrium, and other REEs will guide target delineation.
Integrated Targeting and Drill Program: The 3D MT model, complete geochemical dataset, and reprocessed gravity/magnetic data will be layered to identify coincident anomalies. High-priority targets exhibiting the Mountain Pass-like signature (gravity high, magnetic low, intermediate resistivity) will be slated for drilling. The planned campaign will test both REE potential in the carbonatite target and remaining gold resources in the breccia pipes, with updates to follow upon target finalization.
About Dateline Resources Limited
Dateline Resources Limited (ASX: DTR, OTCQB: DTREF) is an Australian company focused on mining and exploration in North America. The Company owns
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 (
On 23 May 2025, Dateline announced that updated economics for the Colosseum Gold Project generated an NPV6.5 of US
The Colosseum is located less than 10km north of the Mountain Rare Earth mine. Planning has commenced on drill testing the REE potential at Colosseum.
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 quality 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.
Contact Information
Stephen Baghdadi
Managing Director
Dateline Resources Limited
+61 2 9375 2353
info@datelineresources.com.au
www.datelineresources.com.au
Andrew Rowell
White Noise Communications
+61 400 466 226
andrew@whitenoisecomms.com
Follow Dateline on X: @Dateline_DTR
Dateline Resources Limited
Level 29, 2 Chifley Square, Sydney,
NSW 2000, Australia
This press release is authorized for release by the Board of Dateline Resources Limited.
SOURCE: Dateline Resources Limited
View the original press release on ACCESS Newswire
FAQ
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