The company admitted the first quarter 2017 figure was affected by adverse weather in New South Wales.
Production of coking coal in the March quarter of 1.6Mt was in line with Q1 2017.
Total coal production for the company of 30.7Mt was also in line with Q1 2017, reflecting a stronger contribution from the Australian thermal portfolio but offset by weather-related reductions at Prodeco in South Africa.
"Production [at Prodeco] of 3 million tonnes was 1.2 million tonnes or 29% lower than Q1 2017, reflecting the impact on truck productivities during unusually heavy rainfall," it said.
"Quarterly production for the remainder of the year is expected to be at simil...