The contract, which MACA inherited through its purchase of Downer Mining's western division, is expected to generate A$200 million in revenue over a 36-month term.
That term begins in April.
MACA CEO Mike Sutton said the company was pleased to keep working with CITIC Pacific Mining at Sino Iron.
He said he valued the longstanding relationship MACA had with CPM at the "megaproject"
"The current CPM contract was novated from Downer to MACA following the acquisition of the Mining West business and it's pleasing to have now secured this three-year extension," he said.
MACA shares were 1% higher at $1.08.