South32 said its annual aluminium production exceeded its prior guidance across its operations.
Aluminium production for the recent financial year exceeded guidance by1%, while alumina output was in line with guidance.
South32 said earlier this month it had signed a binding agreement to sell aluminium assets to Alcoa for approximately $5.6 billion.
The transaction is expected to be completed in the second half of 2027.
In a quarterly report note on Monday, it said Worsley alumina production was flat 3.7 million tonnes for financial 2026.
Output for the fourth quarter was up 0.7% to 943,000 tonnes year-on-year from 936,000 tonnes, and was up 6.4% from 886,000 tonnes in the third quarter.
Brazil alumina production rose 5.3% to 1.4 million tonnes annually from 1.3 million tonnes.
Production for the fourth quarter was 5.3% higher on-year at 351,000 tonnes from 334,000 tonnes, but was unchanged quarter-on-quarter.
Brazil aluminium production rose 4.3% to 144,000 tonnes for all of financial 2026 from 138,000 tonnes in financial 2025, as the smelter ramped-up all three potlines.
But output for the fourth quarter was down 2.6% to 37,000 tonnes year-on-year and down 12% from 33,000 tonnes quarter-on-quarter.
Hillside aluminium production was down 0.1% annually to 717,000 tonnes from 718,000 tonnes.
For the fourth quarter, production fell 1.1% to 179,000 tonnes year-on-year from 181,000 tonnes, but rose 1.7% from 176,000 tonnes quarter-on-quarter.
"We continued to deliver strong operating results, exceeding group production guidance for FY26," South32 Chief Executive Officer Matt Daley said.
"On 1 July, we announced a step change for South32, with the sale of our aluminium value chain business to Alcoa.
"Once complete, this sale will unlock value for shareholders and reposition South32 as a leading upstream base metals focused company."
