RUC has been engaged by Newmont under a head contract to complete certain construction works for the Tanami Gold Mine Expansion 2, shaft lining, equipment and headframe construction project.
GR will be responsible for the construction and commissioning of the temporary and permanent works associated with the surface infrastructure.
The company expects the contract to generate revenue of A$68 million between now and April 2023.
"GR Engineering is pleased to have executed this first subcontractor agreement with RUC and we look forward to working with RUC to deliver safe and successful outcomes for Newmont and on other future projects," GR managing director Geoff Jones said.
"GR Engineering continues to build its pipeline of work for FY22 and FY23."
GR shares dropped 1% to $1.485. The stock hit a 52-week high of $1.645 last month.