The company will provide engineering, procurement and construction management services for the approximately $200m infrastructure component of the mine.
According to AECOM, the expansion is expected to extend mining at the site for another 26 years.
The company joins Xstrata Coal and Downer EDI in an alliance to deliver the expansion project.
Run of mine production at the four-million-ton-per-year, open-cut mine will be increased to 12 million tons per year and feature an open-cut pit, an augmented raw-coal system, expanded coal processing plant and product coal system, refurbished and expanded mine industrial area and associated new civil infrastructure, AECOM said.
Xstrata Coal is due to begin exporting shipments of thermal and semi-soft coking coal next year.
