FY26 capex
Björkdal FY26 AISC guidance includes a significant amount of sustaining capital, which
will provide multi-year benefits, including increased capital development in order
to access new ore, new water management infrastructure, tailings dam construction
and a major fleet replacement programme that falls into the new financial year. In
the meantime, exploration expenditure will include in-fill and extensional drilling
in the North Zone, Eastern Extension, Storheden and Norrberget to build high-grade
inventory and support future mining studies. Once these initiatives are completed,
AISC is expected to return to more normal levels in FY27.
Growth capital expenditures at Tomingley in FY26 include realignment and associated
site services’ infrastructure on the Newell Highway. In order to commence open-cut
mining at San Antonio, the Newell Highway will need to be relocated c 1km to the west
of its existing corridor. This is a substantial body of work that has been through
several design iterations over a number of years to receive full approval from Transport
for NSW. The ore from the open-cut operations will then be added to underground mine
production at Roswell. Construction of the diversion has now commenced, with work
expected to be completed in H1 CY27, after which open-cut mining at San Antonio will
commence. In the meantime, exploration has been targeting reserve and resource growth
at Caloma 2, Roswell, Wyoming and Macleans.
At Costerfield, the predominant growth expenditure will be on exploration, focusing
on near-mine and regional drilling at the True Blue, Sub KC, Brunswick South and Kendall
zones to support further extensions of the mine life and potential processing expansion.
FY26 production
The main source of ore to the plant at Tomingley is now Roswell and, while only a
small portion of the overall ore reserve has been mined, initial grade reconciliations
from the deposit are reported to be performing well. At the same time, the flotation
and fine grind circuit and the paste plant are now in steady-state operation, having
rectified the problem of high rates of wear that caused ore to be ground to 14 microns
instead of 12 microns in Q1 and resulted in sub-optimal metallurgical recovery.
At Costerfield, production will be derived from the Youle zone in FY26, which is planned
to produce at higher antimony grades, and the Shepherd zone, which is predominantly
gold. Work continues to prioritise operational consistency across all aspects of the
operation and trials will occur in Q3 to determine the potential benefits of pre-crushing
ore feed to further improve throughput, crusher downtime and blend control, with the
continuous optimisation of blending and recovery continuing to be a focus.
Mill throughput at Björkdal in Q226 was slightly lower than in Q1, primarily owing
to mill linings not wearing at the anticipated rate, which limited the maximum allowable
mill load. In mitigation, the completion and commissioning of a new return water system
from the mine has had a positive impact on flotation performance to date, with the
more stable water temperature compared with river-sourced water enhancing process
stability and contributing to improved recoveries. This new water redundancy also
reduces the mill’s vulnerability to seasonal fluctuations in river conditions. At
Björkdal, production in FY26 will be derived from the Main zone, Lake zone and three
levels in the lower Aurora zone.
In the light of its guidance, we have formulated quarterly forecasts for each of Alkane’s
three operating mines for the remainder of the financial year, as follows (including
actual numbers to December 2025):