Sky Metals advances Tallebung with strong economics and a larger drilling runway

Tallebung clears the PFS hurdle

Sky Metals Limited (ASX:SKY) has given investors a sizeable economic case for its Tallebung tin-tungsten-silver project in New South Wales, with a pre-tax net present value of approximately A$438 million and a 69% internal rate of return under its base-case assumptions. The study envisages a 3 million-tonne-a-year open-cut operation producing an average of 2,040 tonnes of tin, 31,700 metric tonne units of tungsten trioxide and 315,000 ounces of silver annually over an initial 7.3-year mine life.

The proposed operation requires A$138.8 million in pre-production capital and, according to the company, would repay that investment in less than 17 months. Its all-in sustaining cost is estimated at US$5,653 per tonne of tin produced, net of co-products, using assumed prices of US$45,000 a tonne for tin, US$1,500 per metric tonne unit for tungsten trioxide and US$50 a gram for silver. The earlier Tallebung PFS had set out the same development framework, while this quarterly report places it alongside the resource growth and approvals work now required to advance the project.

Resource growth is central to the mine-life case

The PFS uses only 66% of Tallebung’s global Mineral Resource Estimate, leaving the study with a defined initial mine plan but a potentially larger resource base behind it. The updated estimate totals 32.7Mt at 0.16% tin equivalent, containing 36.8kt of tin, 1.14 million metric tonne units of tungsten trioxide and 9.94Moz of silver at a US$20-per-tonne net smelter return cut-off.

Most importantly for the development timetable, 19.9Mt sits in the Inferred category and was excluded from the PFS. Sky Metals has restarted drilling to convert parts of that material into Measured and Indicated Resources and to test extensions to the existing envelope. The deposit remains open in all directions, but any longer mine life or additional value from that material still depends on successful drilling, estimation and eventual inclusion in a revised study.

New drilling and approvals set the next tests

A new programme of more than 150 reverse-circulation holes is now targeting resource growth and development optionality. Early results include 17 metres at 0.70% tin, 0.03% tungsten trioxide and 14.8 grams per tonne silver from 26 metres in hole TBD022, including four metres at 2.44% tin. Other reported intersections included 29 metres at 0.31% tin in TBRC471 and a one-metre interval grading 5.45% tungsten trioxide in TBRC468. The company also reported coarse wolframite in two diamond holes, with assays pending, while the July Tallebung drilling results had identified mineralisation beyond the resource estimate.

Sky is also preparing to drill the Theirman Mines Prospect, about 20 kilometres from Tallebung, after surface sampling returned up to 7.44% tungsten trioxide across more than 500 metres of prospective strike. That work could add another exploration angle to the project, but surface sampling is not a resource estimate and the prospect has yet to be tested by drilling.

The development pathway is moving in parallel. The environmental impact statement has commenced within the NSW State Significant Development process, with mining approval targeted for late 2027 and first production for mid-2028. Sky intends to select a Definitive Feasibility Study consultant, continue optimisation and bulk-sample metallurgical work, and progress financing and offtake discussions ahead of a targeted final investment decision during 2027.

At 30 September, the company held A$14.5 million in cash and cash equivalents after spending A$2.258 million on exploration during the quarter. That balance supports the immediate drilling, study and approvals programme, but the proposed development still carries a capital requirement materially larger than the cash currently on hand. The next stage will therefore test not just whether Tallebung can grow, but whether its economics can survive the transition from PFS assumptions to a financeable project.