Sky Metals has unveiled a significant Mineral Resource Estimate upgrade for its Tallebung project, lifting tin and tungsten inventories substantially and introducing a maiden silver resource. This positions Tallebung as a large-scale, shallow open-pit opportunity with promising metallurgical and development prospects.
- 32.7Mt resource with 36.8kt tin and 1.14M mtu tungsten
- Maiden silver resource of 9.94Moz added
- Resource exceeds previous exploration target limits
- Low-strip open-pit development supported by ore sorting
- Further resource growth expected from ongoing drilling
Resource Upgrade Surpasses Expectations
Sky Metals Limited (ASX:SKY) has delivered a major upgrade to its Tallebung Tin-Silver-Tungsten Project in New South Wales, reporting a Mineral Resource Estimate (MRE) of 32.7 million tonnes at 0.16% Tin Equivalent. This translates into 36,800 tonnes of contained tin, 1.14 million metric tonne units (mtu) of tungsten trioxide, and a maiden silver resource of 9.94 million ounces. The new MRE comfortably exceeds the upper limit of the company’s previous exploration target, marking a significant milestone as the project transitions from exploration to development.
The scale and grade uplift are notable: tin content increased by 58% overall and more than doubled in the measured and indicated categories, while tungsten more than doubled. The introduction of a silver resource adds a fresh revenue stream that could materially enhance project economics in the upcoming Pre-Feasibility Study (PFS).
Shallow, Large-Scale Open Pit Potential
The resource remains open in all directions, with ongoing drilling returning encouraging broad, shallow, and high-grade intercepts beyond the current MRE boundary. Recent drill results have identified a new zone of tin-tungsten-silver mineralisation along the north-eastern margin, not yet included in the updated resource, hinting at further expansion potential.
The deposit’s near-surface nature supports a low-strip ratio open-pit mining scenario, leveraging proven ore sorting technology and conventional gravity processing to produce saleable concentrates of tin, tungsten, and silver. Metallurgical testwork, including TOMRA ore sorting, has demonstrated over 10-fold grade upgrades and potential to reduce mass for processing by at least 75%, significantly lowering capital and operating costs.
This metallurgical advantage is critical; gravity concentration testwork has confirmed the ability to produce a +60% tin concentrate cost-effectively, with separate tungsten and silver products also achievable. Such favourable metallurgy underpins a simple, low-cost flowsheet that enhances the project's economic robustness.
Robust Technical Foundation and Pathway to Development
The updated MRE is based on an extensive dataset of 471 drill holes totaling over 64,500 metres, including 356 holes drilled by Sky Metals since 2023. Independent geological consultants Manna Hill Geoconsulting applied advanced Localised Multiple Indicator Kriging (LMIK) techniques to handle the deposit’s complex, polymetallic mineralisation and high-grade variability, delivering a resource classification spanning measured, indicated, and inferred categories.
Mining assumptions for the MRE include conventional open-pit methods with detailed geotechnical inputs and operating costs estimated at A$19.58 per tonne. The NSR cut-off grade of US$20 per tonne incorporates conservative commodity prices and recovery factors, reflecting the multi-commodity nature of the deposit.
Environmental and regulatory progress continues apace, with the project advancing through the NSW State Significant Development approval pathway and the Environmental Impact Statement underway. The PFS is expected imminently, promising further clarity on project economics and capital requirements.
CEO Highlights Transition to Development
Sky Metals’ Managing Director Oliver Davies emphasised the significance of the resource upgrade, noting that the expanded tin and tungsten inventory, combined with the maiden silver resource, positions Tallebung as one of Australia’s most significant emerging tin-tungsten-silver projects. He highlighted the ongoing drilling success and the imminent completion of the PFS as key steps in moving from exploration to development backed by a large, well-defined resource and proven metallurgy.
With further drilling planned to infill and extend the resource, and strong metallurgical credentials underpinning a low-cost processing approach, Tallebung is shaping up as a compelling open-pit development opportunity in a critical metals space.
Bottom Line?
The Tallebung upgrade sets a robust foundation, but the upcoming Pre-Feasibility Study will be crucial to translating resource scale and metallurgy into economic viability.
Questions in the middle?
- How will the maiden silver resource impact overall project economics in the PFS?
- What is the timeline and likelihood of further resource expansion beyond the current MRE?
- How might evolving commodity prices for tin, tungsten, and silver affect project feasibility?