Sales of produced coal increased 15.6%, closing out a strong year across all sites.

The company said it remained confident of continuing the high performance from its operations in all conditions in the March quarter.

"These results were supported by multiple new production records being achieved," it said.

"This represents a final result of above guidance saleable production for 2023, notwithstanding robust closing inventory positions."

RoM coal produced in the December quarter came to 4.8Mt while the full-year 2023 figure was 18.4Mt.  

Stanmore chief executive Marcelo Matos said saleable production for the quarter remained strong with coal sales benefitting from extra logistics capacity the company bought recently and an improvement in rail network and haulage performance in the Bowen Basin.

"The company has ended the quarter with healthy levels of product and RoM stockpiles which should also support 1Q 2024 sales performance," he said.

"The saleable production results for the year are a testament to the consistency and resilience of our operations, especially considering weather events experienced throughout the year and challenges associated with the rail network and haulage performance in the first half of 2023."

Matos said Stanmore was well positioned to benefit from ongoing supportive market conditions, with potential upside should a relativity mean reversion occur in 2024 for its pulverised coal injection products.

"Pricing for metallurgical coals remained strong through the quarter, with continued tight balance for supply of prime materials, whilst prices for non-prime materials remained stable," he said.

Matos said the company also reported four non-severe recordable injuries and one serious recordable injury during the quarter.