Kingsgate Consolidated Restores Chatree to Full 4.6 mtpa Capacity After 47-Day Mill Fix
Key Takeaways
- Ball Mill 1 at Chatree has returned to full nameplate capacity of 2.3 mtpa after a 47-day shutdown, restoring Plant 1 to normal operations.
- During the shutdown, Chatree maintained an annualised throughput rate of 4.3 mtpa — 87% of combined nameplate capacity — demonstrating strong operational management through a major mill overhaul.
- A 7-day non-destructive testing run at full capacity confirmed no changes to thermo-mechanical cracks on the journal surface before Ball Mill 1 was returned to service.
- Kingsgate has ordered a new discharge end mill head with a 34-week lead time, expected to arrive in Q4 FY2027 and be installed during a scheduled Plant 1 maintenance shutdown to reduce future disruption risk.
- An updated FY27 guidance statement accounting for the throughput impact of the 47-day shutdown will be released by end of September 2026.
Chatree gold mine back at full capacity after 47-day Ball Mill 1 shutdown
Kingsgate Consolidated has confirmed that Plant 1 at its Chatree Gold Mine has returned to its nameplate capacity of 2.3 mtpa following the successful restoration and restart of Ball Mill 1. The recovery closes out a 47-day shutdown period, during which the mine continued operating at an annualised throughput rate of 4.3 mtpa, equivalent to 87% of combined nameplate capacity.
That figure matters. Maintaining throughput at 87% while undertaking a major mill overhaul points to a well-managed operational response rather than a straightforward stoppage.
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What the remediation works involved
The restoration of Ball Mill 1 required a structured sequence of works targeting the trunnion bearing system, which supports the rotating drum of the mill. The works completed during the shutdown included:
- Removal of the trunnion bearings
- Full overhaul of trunnion hydraulic lubrication units
- Refurbishment and linishing of the trunnion journals
- Full replacement of both trunnion bearings
Seven-day test run confirms stability
Before returning Ball Mill 1 to normal operations, the team ran the mill at full capacity for 7 days as part of non-destructive testing (NDT). NDT is an inspection method that assesses the condition of equipment without dismantling it, in this case testing for possible expansion or changes to remaining thermo-mechanical cracks on the journal surface.
The outcome was clear: no changes were identified. The operating team continues to monitor the situation.
Jamie Gibson, CEO and Managing Director
“The immediate workaround and subsequent resumption of full nameplate processing capacity within 47 days after a major Ball Mill incident is a testament to the operating team’s hard work. It highlights the operational and technical capabilities we have continued to build within the business since the restart of the Chatree gold mine. This is an important milestone as we return to full production rates.”
Understanding ball mill operations at a gold mine — why this matters to investors
A ball mill is a large rotating cylinder filled with steel balls that grinds crushed ore into fine particles. That grinding step is essential in gold processing because it breaks the rock down to a size where gold can be chemically separated and recovered. Without it, ore cannot be processed into saleable metal.
Nameplate capacity is the maximum throughput a plant is designed to sustain under normal operating conditions. For Chatree, Plant 1 carries a nameplate capacity of 2.3 mtpa.
With Plant 1 back at 2.3 mtpa, Chatree is positioned to operate at its full combined capacity.
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What comes next — proactive upgrade and FY27 guidance update
New mill head ordered as a proactive risk mitigation step
To reduce the risk of a repeat disruption, Kingsgate has ordered a new discharge end mill head, including fasteners and guards, as a forward-looking capital investment. The key details are summarised below.
| Item | Detail | Timeline |
|---|---|---|
| New discharge end mill head | Including fasteners and guards | Lead time approximately 34 weeks |
| Anticipated arrival | Q4 FY2027 | — |
| Installation | To be incorporated into regular Plant 1 maintenance shutdown schedule | Duration and throughput impact subject to final planning |
Installation will require a temporary shutdown of Ball Mill 1. The company intends to fold the installation into Plant 1’s regular maintenance schedule to minimise any further disruption, though the precise duration and any throughput impact remain subject to final planning.
FY27 guidance update expected by end of September
Kingsgate is currently assessing the impact of reduced Plant 1 throughput during the 47-day shutdown period. The company expects to provide an updated FY27 guidance statement to the market by the end of September 2026.
Rather than leaving investors without a timeframe, Kingsgate has proactively committed to a disclosure schedule. That transparency is worth noting: you know when to expect the revised numbers, and you know the operational disruption has already been resolved before the guidance update arrives.
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