• FY26 production guidance reduced to 1.40M-1.45M lbs U3O8 from previous 1.6M lbs
• Heavy rainfall and degraded road conditions disrupted Q3 FY26 production and infrastructure ramp-up
• Q4 FY26 production expected to be 356k-406k lbs U3O8

Boss Energy Limited has advised that FY26 production guidance at its Honeymoon Operation in South Australia has been reduced to between 1.40M lbs and 1.45M lbs U3O8 drummed, from previous guidance of 1.6M lbs U3O8 drummed. The company announced in March 2026 that heavy rain had impacted production for Q3 FY26 by restricting site access and limiting the delivery of reagents and other goods required for production and plant infrastructure ramp-up. At that time, Boss expected road access to recover sufficiently during March to support reagent deliveries and a strong Q4 FY26, therefore maintaining full-year production guidance. However, subsequent unexpected rainfall during March 2026, combined with the already degraded baseline condition of access roads, extended the disruption beyond this assumption. Production for Q3 FY26 was 203k lbs U3O8 drummed, below the previous guidance range of 240k lbs to 270k lbs U3O8 drummed. For Q4 FY26, Boss expects production of between 356k lbs and 406k lbs U3O8 drummed to achieve the revised full year guidance, below the previous guidance range of 490k lbs to 520k lbs U3O8 drummed. Despite the lower production guidance, Boss confirms it remains on track to deliver FY26 C1 cost guidance of $36-40/lb and an All In Sustaining Cost guidance of $60-64/lb, which were previously lowered from $41-45/lb and $64-70/lb, respectively. However, costs per pound are now expected to be at the upper end of the cost guidance range, including impacts of fuel-related increases passed through by reagent transport and air charter providers.

FY26 C1 cost guidance of $36-40/lb and All In Sustaining Cost guidance of $60-64/lb, with costs expected to be at the upper end of the range