Marquee Resources Refines West Spargoville Lithium Drilling Targets

Marquee Resources Refines West Spargoville Lithium Targets Ahead of Drill Redesign

Marquee Resources (ASX:MQR) has completed a targeted ground-truthing and rock-chip sampling program at its West Spargoville Project (WSP) in Western Australia, submitting 49 rock-chip samples to ALS laboratory for analysis. The Marquee Resources West Spargoville lithium drilling update has delivered a refined structural interpretation of the project's stacked pegmatite system, identifying a potential mismatch between historical drilling orientation and the geometry of the lithium-bearing structures now interpreted.

The work builds on an extensive exploration history at West Spargoville rather than starting from scratch. The project already carries previously reported rock-chip assays up to 3.01% Li₂O, spodumene identified in 10 individual pegmatites, and a swarm of more than 40 fertile pegmatites mapped across the tenure. The 2026 program was designed to sharpen the three-dimensional geometry of that system to inform a better-targeted drill campaign.

A Project With History, and a Thesis Built on It

West Spargoville sits in the Widgiemooltha area of the Southern Yilgarn region, an established lithium address in Western Australia that neighbours or includes projects such as Mt Marion, Bald Hill, Buldania and Pioneer Dome. The project covers approximately 80 km² and is held under a joint venture structure with Mineral Resources Limited (ASX:MIN), with Marquee holding a 75% interest in the lithium rights and MIN retaining the remaining 25%.

According to the announcement, the scale of exploration completed to date at WSP is considerable:

This history matters in context. Marquee is not speculating on an untested concept but reassessing a known lithium system using a refined geological model to determine whether prior drilling was positioned to properly test it.

The Central Issue: Drilling Oblique to the Target

The key finding from the 2026 fieldwork relates to structural geometry. The mapped pegmatites within an approximately 1.5 km by 1.5 km target area consistently strike northeast-southwest and are interpreted to dip steeply to the northwest. When assessed against the historical reverse circulation (RC) drilling program, the company noted a material mismatch: historical RC holes within the target were predominantly drilled toward the east, a direction oblique to both the strike and dip of the pegmatite system now interpreted.

In practical terms, drilling at an angle that runs across rather than perpendicular to a steeply dipping pegmatite can result in holes cutting through only the edge of a body, or missing stacked bodies entirely. Marquee's view, as outlined in the announcement, is that this orientation mismatch may have caused several lithium-prospective pegmatite trends, including those associated with anomalous surface geochemistry, to be incompletely tested.

"The key point from this work is that the historical drilling does not, in our view, definitively test the lithium potential at West Spargoville. We have a substantial existing dataset, previously reported spodumene-bearing pegmatites and rock-chip assays up to 3.01% Li₂O, and a refined structural model indicating that much of the historical RC drilling was oblique to the pegmatite geometry now interpreted. That gives us a clear technical basis to revisit the highest-priority trends with better-oriented drilling."

— Charles Thomas, Executive Chairman and Managing Director, Marquee Resources

Several anomalous surface occurrences, including rock-chip samples returning above 1% Li₂O, remain unreconciled with the historical subsurface drilling data. These include a peak result of 3.01% Li₂O (sample 24WS0010), 2.76% Li₂O (sample 24WS0017), and 2.36% Li₂O (sample 24WS0004), all previously reported in April 2024. The 2026 program directly targets the disconnect between these surface expressions and what the historical drill holes captured.

Understanding Drill Orientation: Why Does Angle Matter in Pegmatite Exploration?

One concept relevant to investors following this story is the relationship between drill orientation and pegmatite geometry. Pegmatites are coarse-grained igneous rocks that commonly host lithium minerals such as spodumene, and are typically tabular or sheet-like bodies. They have a defined strike (the compass direction along which the body extends horizontally) and a dip (the angle at which the body descends into the ground).

To properly test a pegmatite, a drill hole needs to intersect it at a sufficient angle, ideally close to perpendicular to the body's dip. When a hole runs roughly parallel to a pegmatite's dip direction, or cuts across it obliquely, it may:

• Pass through only a thin slice of the body, understating its true thickness
• Miss stacked or adjacent bodies running in a different orientation
• Return short or weak intercepts that do not represent the actual mineralised system

At West Spargoville, the pegmatites are interpreted to dip steeply to the northwest, while historical holes were predominantly drilled toward the east — a direction that runs at an angle to the bodies rather than across them. Redesigning drill holes to intersect the northwest-dipping bodies more directly is the technical fix Marquee is now pursuing.

Glossary of Key Terms

• Spodumene: A lithium-bearing mineral that is a primary ore mineral in hard-rock lithium pegmatites
• LCT pegmatite: A lithium-caesium-tantalum pegmatite, a class of rare-element pegmatite commonly hosting economic lithium mineralisation
• Li₂O: Lithium oxide, the standard unit for expressing lithium content in exploration and resource reporting
• RC drilling: Reverse circulation drilling, a method commonly used in Australian lithium exploration in which crushed rock chips are returned to surface using compressed air
• Strike: The horizontal compass direction along which a geological feature extends
• Dip: The angle at which a geological feature descends below horizontal
• DGPS: Differential Global Positioning System, a high-accuracy GPS method used to record precise sample and drill hole locations

What the 2026 Field Program Involved

The completed program was deliberately targeted rather than broad in scope. Marquee personnel collected 49 rock-chip samples (labelled 26WS0001 through 26WS0049), with locations recorded by DGPS in MGA94 Zone 51. Samples were taken from a range of geological settings across the target area, including:

• Fresh and weathered pegmatite outcrop, subcrop and float
• Ferruginous saprolite and lag positions
• Rubbly hillslope subcrop and boulder/tor-style exposures
• Selected mafic contact and structural positions

This variety of sample types reflects an effort to ground-truth key exposures and understand the contact relationships between pegmatite bodies and surrounding host rocks — information that feeds directly into the three-dimensional model used to design the next drill program.

All 49 samples were delivered to ALS on 27 July 2026 and are being analysed under the following suite:

No new assay results are reported in this announcement. Laboratory analysis is in progress, with results to be reviewed through the company's quality assurance and quality control (QAQC) process before release.

What Comes Next: A Sequenced Path to Drilling

According to the announcement, the roadmap from here follows a defined sequence:

1. Receive and validate laboratory results through completion of QAQC review of all 49 assay certificates from ALS
2. Database integration of validated lithium, pathfinder-element, whole-rock and gold data into the existing WSP exploration database
3. 3D model update refreshing the geological interpretation using the new geochemistry, completed ground-truthing, historical drilling data and available geophysical datasets
4. Target re-ranking of the stacked pegmatite trends based on the integrated dataset
5. Drill redesign of RC sections to intersect the northeast-southwest-striking, steep northwest-dipping pegmatites at more appropriate orientations
6. Re-oriented RC campaign, subject to assay results, interpretation and approvals, of approximately 2,000 m focused on the highest-priority pegmatite positions

The Investment Case: Why Does This Reassessment Carry Weight?

Marquee's position at West Spargoville is built on a documented technical foundation rather than a conceptual regional play. The project has years of surface mineralisation data, substantial drilling history, and a joint venture partner in Mineral Resources Limited, which holds a 25% interest in the lithium rights. Furthermore, the Marquee Resources West Spargoville lithium drilling update provides a clear structural rationale for why previous results may not have adequately tested the system.

Documented Surface Anomalism

Documented surface lithium anomalism with unexplained drill results. Multiple rock-chip samples above 1% Li₂O, including a peak of 3.01% Li₂O, remain unreconciled with historical RC drilling. This gap forms the central technical argument for re-testing the target area.

A Refined Structural Model

A refined structural model that changes the exploration approach. The identification of northeast-southwest-striking, steeply northwest-dipping pegmatites, together with the recognition that historical drilling was oblique to this geometry, provides a specific technical basis for redesigning the drill program.

A Substantial Existing Dataset

A substantial existing dataset. With over 47,000 m of combined aircore and RC drilling, thousands of geochemical samples, detailed aeromagnetics, gravity surveys and 3D modelling already in hand, the incremental cost of reaching the next drill decision is relatively contained.

Southern Yilgarn Address

Southern Yilgarn address. West Spargoville sits within a recognised lithium province in Western Australia that includes producing and advanced lithium projects, supporting the presence of LCT pegmatite systems in the regional geological setting.

Joint Venture With Mineral Resources Limited

Joint venture with Mineral Resources Limited. Marquee holds the majority interest and operates the project, with Mineral Resources retaining a 25% interest in the lithium rights.

Why West Spargoville Warrants Continued Attention

The situation combines documented surface lithium grades, a structural explanation for why prior drilling may have underperformed, and a defined plan to address it. Marquee's approach involves changing the drilling design based on new geological information rather than repeating the historical program.

The next material event is receipt of the 49 rock-chip assays from ALS. Should those results confirm and extend the lithium anomalism already documented at surface, they would support a re-oriented drill program targeting positions the historical drilling did not adequately test. The approximately 2,000 m program contemplated by the company would represent a meaningful test of a structurally interpreted system, though there can be no assurance that follow-up drilling will define economic mineralisation.

Consequently, the Marquee Resources West Spargoville lithium drilling update positions the project at a pivotal juncture, with incoming assay results set to determine whether a re-oriented RC campaign proceeds.

Key Takeaway

Marquee Resources has outlined a technical case that West Spargoville's lithium potential may not have been adequately tested by historical drilling, and has set out a sequenced path to address it. With 49 rock-chip samples at the laboratory and a re-oriented ~2,000 m RC program planned subject to results, the project is approaching near-term catalysts that could inform how the market assesses this asset. Investors with an interest in Western Australian hard-rock lithium exploration may wish to monitor the incoming assay results and any subsequent drill program announcement.

Want to Know More About Marquee Resources' West Spargoville Project?

With 49 rock-chip samples at the laboratory, a refined structural model, and a re-oriented ~2,000 m RC drill program planned subject to results, Marquee Resources (ASX:MQR) is approaching a series of near-term catalysts at West Spargoville that could materially shape how the market values this asset. Investors looking to understand the full scope of the project, the technical case behind the drill redesign, and what's next for the company can find further information by visiting www.marqueeresources.com.au.