FireFly drilling opens a new high-grade path at Green Bay

High-grade mineralisation moves beyond the current resource

FireFly Metals Ltd (ASX:FFM; TSX:FFM) has extended the high-grade core of its Green Bay Copper-Gold Project beyond the current Mineral Resource Estimate, with the new zones sitting laterally and up-dip, closer to the potential mine workings. The headline intersections were 16.4 metres at 9.2% copper equivalent in hole MUG26-173, 6.9 metres at 10.0% CuEq in MUG26-164 and 5.1 metres at 6.5% CuEq in MUG26-176.

That geometry is the important part of the announcement. FireFly said the extensions could add copper tonnes per vertical metre and potentially improve access to the mineralisation, although the economic effect remains subject to resource modelling, mine planning and feasibility work. The company’s existing Green Bay resource contains 60.2 million tonnes at 2.4% CuEq in Measured and Indicated categories, plus 23.5Mt at 2.5% CuEq in Inferred resources.

Infill drilling supplies stronger data for the feasibility study

Results inside the existing resource were similarly striking. Infill holes returned 9.8 metres at 14.2% CuEq, 15.5 metres at 12.4% CuEq, 6.8 metres at 11.0% CuEq and 10.2 metres at 8.1% CuEq, with the company saying the results are consistent with its estimates for the Inferred portions of the August 2026 MRE.

FireFly’s high-grade Ming Core Zone currently comprises 18.1Mt at 4.3% CuEq in Measured and Indicated resources and 7.0Mt at 4.4% CuEq in Inferred resources. The distinction between those categories matters: the company says only M&I material can be incorporated into a feasibility-study mine plan and economic analysis, or converted into Ore Reserves. The drilling is therefore doing two jobs at once: testing for more mineralisation and increasing confidence in material that could ultimately be scheduled for mining.

Broad Footwall Zone results added a different layer to the picture, including 83.8 metres at 2.8% CuEq in MUG26-124, with sub-intervals of 9.9 metres at 7.6% CuEq, 17.0 metres at 4.0% CuEq and 41.9 metres at 2.0% CuEq. Another hole returned 40.1 metres at 2.6% CuEq. These are not equivalent to the narrow, very high-grade VMS hits, but they point to substantial copper-bearing stringer mineralisation beneath the upper lenses.

The results now face the feasibility test

The new drilling will be incorporated into an updated MRE planned for the March quarter of 2027, alongside the Definitive Feasibility Study for the 1.8Mtpa base case. That work follows FireFly’s A$3 billion Green Bay PEA, which outlined an after-tax NPV of A$3.0bn for a 4.6Mtpa scenario, according to earlier company reporting. The present announcement does not change those PEA figures; it argues that the new, shallower mineralisation could influence the next mine plan and its economics.

Six underground rigs will continue infill and extension drilling at Ming, while three surface rigs pursue regional targets. Assays are pending from Mount Joy, where FireFly recently reported a 22.5-metre intersection at 2.5% CuEq, and the company expects a maiden Inferred MRE for the Main Mine prospect in Q1 2027. That regional program adds exploration upside, but it also means the next few months will produce a mix of resource-conversion data, new discovery assays and development milestones rather than one single project verdict.

Cash supports the next phase, but does not remove execution risk

FireFly reported approximately A$349.7m in cash and liquid investments on an unaudited basis at 30 September 2026. Early works have begun, including seasonal clearing, camp expansion, underground development and upgrades to electrical and wastewater infrastructure. The company says formal construction is targeted for around July 2027, subject to a final investment decision by the board, while it is also assessing project financing options including potential offtake prepayments.

The immediate test is whether the exceptional drill results translate into mineable tonnes in the updated MRE, then into Ore Reserves and a defensible DFS. High grades outside a resource boundary are valuable evidence, but they are not yet reserves, revenue or construction approval. FireFly has supplied the next catalyst clearly: the Q1 2027 resource update and feasibility study will determine how much of today’s geological promise can enter the actual mine plan.