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Miramar Resources Limited (ASX:M2R, “Miramar” or “the Company”) provides an update on exploration at the Company’s 100%-owned Whaleshark Project, in the Ashburton region of WA, where Miramar is exploring for Iron Oxide Copper Gold (IOCG) mineralisation beneath the Northern Carnarvon Basin.
- Bedrock copper sulphide mineralisation confirmed by XRF and assays
- Anomalous assay results up to 0.2% Cu and 0.11g/t Au
- Geochemical vectors towards potential IOCG mineralisation
- Further drilling planned following completion of heritage survey
Diamond drilling results
The Company has recently received assays from the initial 3-hole diamond drilling programme which was co-funded under the Western Australian government’s Exploration Incentive Scheme (EIS).
The initial drilling targeted a gravity anomaly within the Whaleshark granite crosscut by a 4 km long NW- trending structure.
The gravity anomaly sits beneath MMI soil anomalism and strongly anomalous “interface” aircore results up to 435ppm copper (Cu), 889ppm cobalt (Co), 16ppm molybdenum (Mo), 0.16g/t gold (Au) and 7.7g/t silver (Ag).
WSDD001 targeted the southern half of the gravity anomaly, whilst WSDD002 and WSDD003 targeted the NW-trending structure (Figure 1).
Drilling intersected biotite-rich granodiorite which did not explain the gravity anomaly. As such, the Company will model recently collected specific gravity data before retesting the gravity anomaly.
Fine-grained sulphides, including chalcopyrite, were observed throughout two of the three holes. The presence of chalcopyrite was confirmed with handheld XRF at the time of logging and returned spot readings up to 1.2% Cu from the thin shear observed in WSDD002 (Figure 2).
Multi-element assays subsequently confirmed the presence of copper and anomalous Au, Ag, Mo, Lanthanum (La), Cerium (Ce) and Tungsten (W) throughout the Whaleshark granodiorite including:
- WSDD001 – 1m @ 0.10g/t Au (119-120m) and 1m @ 31.4ppm Mo and 1022ppm W (433-434m)
- WSDD002 – 0.4m @ 0.2% Cu and 1.07ppm Ag (231.5 – 231.9m)
- WSDD003 – 1m @ 0.11g/t Au (134-135m)
Summary cross sections of each hole are attached.
Miramar’s Executive Chairman, Mr Allan Kelly, said the Company continued to be encouraged by the results from Whaleshark.
“Since commencing exploration at Whaleshark, we have narrowed the target down from a very large MMI surface geochemical anomaly, outlined aircore copper, gold and silver anomalism and intersected bedrock copper sulphide mineralisation in the first diamond drilling programme,” Mr Kelly said.
“Given the positive indicators seen at Whaleshark so far, including copper mineralisation and anomalous IOCG pathfinders within the Whaleshark granodiorite, we believe we are in the right area,” he added.
“Whaleshark is an exciting project with potential to discover Western Australia’s first IOCG deposit. We are looking for a large deposit here, and there is plenty of room to find one. Each phase of our exploration is helping bring us closer to that potential discovery,” Mr Kelly said.
Figure 1. Whaleshark Project 2VD magnetic image showing diamond holes in relation to MMI, aircore, and gravity anomalies and potential magnetite alteration.
Figure 2. XRF copper readings from WSDD002 showing “background” copper content for granodiorite (dashed red line). (Note: readings were routinely taken every meter, with additional targeted readings taken where sulphide mineralisation was observed.)
Geochemical Vectors
Examination of the multi-element XRF and assay data from this programme has highlighted geochemical vectors that could be useful for further exploration for IOCG mineralisation at Whaleshark.
Published data from the Prominent Hill and Carrapateena IOCG deposits in South Australia showed that monazite grains related to IOCG mineralisation have high La and Ce concentrations, and correspondingly low Y and Th concentrations, when compared to “background” samples.
This diagnostic high La and Ce geochemical signature has also been observed in analysis of cover sediments over the Prominent Hill deposit (Figure 3).
At Whaleshark, the aircore and diamond drilling results show similar distributions of La and Ce values from both XRF and multi-element analysis, with the highest La and Ce results in the diamond drilling coming from WSDD003 (Figure 4) suggesting a geochemical vector towards potential IOCG mineralisation in the northwest, where a large magnetic anomaly is seen.
The highest copper values observed in WSDD003 are associated with very coarse-grained magnetite confirmed by elevated magnetic susceptibility readings.
Combined, these two observations indicate that the large magnetic anomaly at the northwestern end of the structure could represent magnetite alteration associated with IOCG mineralisation.
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M2R:AU
Ultra-High Grade Naturally Occurring Antimony at Alturas Project with Assays up to 69.98% Sb
Highlights
- Rock chip samples from the Alturas Antimony project in British Columbia, Canada, have returned outstanding ultra-high grade Antimony assays, including:
- 69.98% Sb – sample ALT24-PS-R003
- 67.96% Sb – sample ALT24-JL-R004
- 49.98% Sb – sample ALT24-JL-R005
- 47.97% Sb – sample ALT24-JL-R002
- 45.55% Sb – sample ALT24-JL-R003
- 44.45% Sb – sample ALT24-PS-R002
- 37.39% Sb – sample ALT24-PS-R004
- 28.81% Sb – sample ALT24-PS-R005
- 20.89% Sb – sample ALT24-JL-R009
- 20.17% Sb – sample ALT24-PS-R001
- 18.01% Sb – sample ALT24-JL-R007
- 16.77% Sb – sample ALT24-JL-R010
- 14.75% Sb – sample ALT24-JL-R001
- 12.42% Sb – sample ALT24-PS-R006
Pure Stibnite, Antimony Ore contains 71.4% Sb
- Additional ground totaling 3.3 km2 has been strategically staked to the east and west of the property, offering further potential to expand the mineralised footprint.
- 105 tonnes of Antimony ore, averaging 57.20% Sb has been historically sold from the Alps- Alturas Antimony Mine on this property.
- Since the execution of the option agreement for the Alturas project, the price for Antimony has reached US$36,000 per metric ton as of October 25, 2024, from approximately US$24,000 per metric ton at the time of acquisition. This significant price increase has been driven by supply constraints arising from new export controls on antimony announced by China in September 2024.
- Malachite stained rock chip from copper-bearing boulder field returned up to 0.96% Cu, offering potential for copper mineralisation beneath the surface.
- Drilling underway at Brazilian REE projects with assay results pending.
Equinox Resources Managing Director, Zac Komur commented:
We are thrilled to announce our latest exceptional exploration results, revealing extraordinary antimony assays that highlight the immense potential of the Alturas Project. Rock chip samples have returned grades as high as 69.98% antimony (Sb), establishing some of the world's highest reported natural stibnite (Sb2S3) grades. Considering that pure stibnite contains 71.4% antimony, these findings confirm Alturas as a truly unique and valuable asset.
By strategically expanding our footprint with additional claims to the east and west, we are positioned to explore beyond the known mineralisation. The discovered copper zone, with rock chips grading at 0.96% Cu, along with an extensive shear system, further solidifies Alturas as an outstanding opportunity. This project offers us a rare chance to unlock substantial value by systematically exploring an underexplored, ultra-high-grade asset in a mining-friendly jurisdiction.
We’re also continuing drilling at our Mata da Corda Titanium and Campo Grande Rare Earth Projects in Brazil, with assays pending.”
Reconnaissance Sampling
In September 2024, Equinox Resources conducted a maiden reconnaissance sampling campaign at the Alturas Antimony Project to evaluate the potential for high-grade antimony and associated polymetallic mineralisation along the extensive shear zone. The objectives of the reconnaissance campaign were to map and sample key structures by focusing on the 1.5 km shear zone, identified as the main mineralising structure, and to assess antimony concentrations in rock chip samples across newly identified dilation zones and extensions.
Figure 1: Location diagram of rock chip and soil samples taken with mapped shear zone identified
Figure 2: Assay results concentrated across the shear zone (Sb grades greater than 1%)
Project Overview
The Alturas Antimony Project is located in the Slocan Mining Division of British Columbia, Canada, approximately 15 kilometers northeast of New Denver. The project area is situated within a favorable geological setting, featuring a 1.5 km shear zone with polymetallic potential, including antimony, copper, and silver. The tenements cover the historic Alps-Alturas mine, an Antimony mine which operated between 1916 and 1926 selling ultra-high grade Antimony, averaging 57.2% Sb and up to 59.50% Sb. On 10 September 2024, Equinox Resources entered into a 12-month option to acquire 100% interest in all three tenements.
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Woomera Completes Maiden Drilling Program at Bronze Fox Copper-Gold Porphyry Project
- Woomera’s first drill programme at the Bronze Fox Project in Mongolia has been completed.
- 16 Diamond drill holes were completed for a total of 2516m.
- Drilling largely focussed on shallow infill and extension drilling with a single deeper hole (F109/916.4m) testing a coincident geophysical/structural target.
- The target porphyry was intersected in all holes with assays due late December/early January.
- Woomera can earn an 80% interest in the Bronze Fox Project by spending US$4m on exploration (with an election to acquire 100%).
Assays for the program are expected to be available in late December 2024 or early January 2025. Woomera can earn an 80% interest in the Bronze Fox Project from Kincora Copper Limited (ASX: KCC) by expenditure of US$4m and has to the right to acquire a 100% interest.
Figure 1: Drilling at Bronze Fox
Figure 2: Field work at Bronze Fox
BRONZE FOX PROJECT
The Bronze Fox Project covers 175km2 and is located in the Southern Gobi porphyry belt of southern Mongolia, approximately 450km south of the capital Ulaanbaatar. It represents an opportunity to secure a 100% interest in an underexplored world-class porphyry copper project with genuine Tier-1 potential. Drilling by Kincora totalling 46,625 metres of Reverse Circulation and Diamond Core drilling has defined three shallow, large porphyry complexes, providing genuine new discovery potential, resource delineation and early-stage exploration plays.
The Bronze Fox Project contains the West Kasulu Inferred Mineral Resource of 194.1Mt at 0.26% Copper Equivalent (CuEq), at a 0.2% CuEq cut-off to a depth of approximately 325m below surface and an Exploration Target of between 100Mt and 300Mt at 0.25 to 0.35% CuEq.20221
The Bronze Fox Project is located proximal to several world class mineral deposits including Oyu Tolgoi, Kharmagtai, Tsagaan Suvarga and Tavan Tolgoi (see Figure 3).
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Kurundi Main Assay Results Tennant Creek
- TTRC098: 9m @ 1.62g/t Au from 49m including 1m @ 12.75g/t Au from 53m.
Other high-grade results include:
- TTRC103: 3m @ 8.3g/t Au from 35m including 1m @ 16.25/t Au from 36m at the central main zone.
- TTRC092: 5m @ 2.14g/t Au from 38m including 1m @ 6.39g/t Au from 40m at the central main zone.
- TTRC110: 2m @ 5.11g/t Au from 44m including 1m @ 6.33g/t Au from 45m at the northern workings
Also, a possible new style of mineralisation on a porphyry-basalt contact, footwall to the central main mineralized zone has been identified (requires further investigation - see Central Target Area section below) with an intersection of:
- TTRC103: 2m @ 10.93g/t Au from 51m including 1m @ 20.75g/t Au from 51m.
All intersections are stated as down hole widths which are close to true width for the Kurundi Main structure. A second phase of drilling has commenced to test the new southern high-grade zone and continue exploring the other Kurundi Main targets.
Figure 1: Kurundi Main Prospect 2024 drilling (blue dots) with best new results (yellow labels). 2022 drilling shown as black dots.
A total of 28 RC holes for 1,986m have been completed (results listed in Table 2) testing 3 main targets: (1) northern and southern extensions of the Kurundi structure up to 1km from the central main workings, (2) testing the plunge of the central high-grade shoot intersected in 2022 drilling, (3) testing mineralisation deeper under the central main workings.
Central Target Area:
Drilling has confirmed a southerly plunge to the central main high grade gold mineralisation identified in 2022 drilling with TTRC0103 and TTRC092 intersecting high grade gold mineralisation (Figure 2). Also, TTRC103 intersected an unexpected high grade gold zone of mineralisation footwall to the central main zone, on the contact between the basalt host rock and a porphyry intrusive unit (cross section in Figure 3). Due to the lack of structure and alteration being visible in the drill chips the result was initially perceived as a sampling error (2 composite samples from this interval returned anomalous results). However, re-assaying of the pulps followed by resampling at 1m intervals confirmed the presence of gold mineralization and eliminated possible sampling and laboratory errors. This possible new style of mineralisation will be investigated thoroughly with reinterpretation, drill hole relogging, multi element analysis, petrography and drilling to understand possible orientations, further targeting and to eliminate the possibility of down hole contamination of samples during the drilling of TTRC103.
In the Central Target Area KRR’s previous 2022 drilling only tested to a vertical depth of 40m. Four new holes have now been drilled to test a vertical depth of 65m. All holes intersected strong structure, alteration and veining confirming the continuation of the central target zone at depth. TTRC105 intersected a broad zone of veining and alteration and returned 10m @ 0.32g/t Au including 1m @ 0.98g/t Au from 68m with mineralisation open at depth and to the south, shown in the long projection below (Figure 2). The presence of strong veining and shearing at depth across the strike of the central zone is very encouraging for further, deeper drilling.
Figure 2: Long projection of the Central Main Kurundi mineralized zone beneath the central workings area. View is perpendicular to the main vein which dips approximately 35o towards 215o. New results shown in yellow boxes, 2022 results shown in grey boxes, light purple box is for the footwall intersection.
TTRC112 was drilled to test a resistivity anomaly identified by 2023 DDIP survey (KRR ASX: 28 June 2024) however no cause for the resistivity anomaly was identified.
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Exploration Program Commences at Virka
Key Highlights
- Historic data review identifies three areas for immediate field investigation
- Initial mapping and reconnaissance sampling underway
- Historic drill core located for relogging, and where possible, sampling:
- Evidence for both significant width and grade mineralisation at the Virka project from drilling which included 1,2
- 9 m at 1,087 ppm U3O8 from 24.5 m in drill hole 81-003
- within 17 m at 707ppm U3O8 from 23 metres depth
- Evidence for both significant width and grade mineralisation at the Virka project from drilling which included 1,2
- No modern systematic exploration undertaken with last significant exploration in 1980’s highlighting district scale potential
Initial work will focus on the assessment of three areas identified through reviewing historic reports. Limited exploration work was documented, but recorded anomalous base metals, silver and uranium. Exploration work at Virka focussed on North-NorthEast orientated structural features, which were interpreted to be a suitable structural conduit for potential mineralisation.
Basin’s Managing Director, Pete Moorhouse, commented:
“The team at Basin are extremely excited to commence work on the recently announced Scandinavian uranium and green energy metals portfolio. Initial review of the available historical data on the Virka project has provided areas for immediate groundwork. We know that the system is prospective for a variety of metals, with the historical drilling indicating favourable thickness of uranium mineralisation.
The team has commenced work immediately at Virka, conscious of the upcoming winter season. Initial work will focus on getting boots on the ground to assess rock outcrops and trace boulder trains. We will move to historic drill core review and additional literature compilation once the weather prohibits further ground activities.”
Virka Project Background 3
The Virka project is strategically positioned in the heart of the Arjeplog-Arvidsjaur shear-hosted uranium district in Sweden, and approximately 37 km southeast of Boliden’s (STO:BOL) Laisvall Pb-Zn-Ag former mine.
Figure 1: Virka initial work locations
Previous drilling activities conducted in the 1980’s across all licenses targeted uranium mineralisation, with diamond drillholes gamma probed and in rare occasions sampled for geochemical analysis3. Additionally, historical regional geological mapping and boulder tracing records unveiled several surface anomalisms in lead, zinc, silver and gold associated with fault structures. Research indicates that these anomalies have not been adequately followed up with results not verified to JORC Code (2012), however using this data and Basin’s interpretations, three areas have been prioritised for immediate field reconnaissance (Figure 1). This program has commenced with the review of these anomalous features that were historically reported in the project area.
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