IMC saleable production increased 9% to 7.6 million tonnes in 2020-21.
The court was one of a number of options the company was pursuing in relation the project.
The regulator alleges the company failed in its duty to ensure the health and safety of workers.
NSW government not granting South32 a meeting over Dendrobium.
Consortium includes South32, Epiroc, Sandvik and OZ Minerals.
Major project capital expenditure for the Dendrobium extension increased by $16 million in H1 FY21.
He said he would be seeking urgent legal advice.
South32 sought planning approval to extend Dendrobium longwall mine's life until the end of 2048.
Its representatives were also critical of the timeframe allowed for analysis of the proposal.
Appin continued to benefit from the return to a three-longwall configuration.
Mining at Dendrobium has taken place for many years without any significant impacts.
The Russell Vale approval had significant implications for the Dendrobium extension project.