Yancoal's tier-one assets drove continued transformational growth.
For the six months to December, production from the underground longwall operations was 27% higher.
New Hope's share of coal produced at Bengalla for the three months to January 2019 was 1.5Mt.
Coronado booked an additional 82Mt of reserves at Curragh.
BHP said it expected to lower its unit costs to about $57/t.
Contractor grown revenue for the first half 51% on the prior corresponding period.
Revenue for the six months to December increased by 79.1% to $148.2 million.
Ashton and Austar produced a total of 100,000t of saleable tonnes during the December quarter.
Australian coking coal production of 7.5Mt was 23% higher than in 2017.
The company is executing its plan to increase Blair Athol coal sales up to 3Mtpa in two stages.
Rotowaro transitioned to an owner-operator site during November.
Metallurgical coal production increased 2% for the first half of the financial year to 21Mt.
The Moolarben longwall continues to maintain high productivity rates.
Yancoal would continue to improve operational synergies adjacency benefits.
Pilbara iron ore production up 2% year on year and bauxite production remaining strong.
Full-year production guidance in the 11.8Mt-12.2Mt ROM coal range from Maules Creek was reaffirmed.
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