Brookfield Multiplex has started work on the Roy Hill iron ore mine's non-processing infrastructure.
The work is valued at around $73 million.
It follows the contractor finishing its work on the $200 million accommodation village late last year.
According to Brookfield this new contract includes the design and construction of both a heavy and light vehicle workshop, washdown facilities, tyre change areas, and a lube farm.
It also includes services such as power wash and waste water treatment infrastructure and distribution, as well as administration buildings.
Brookfield's subsidiary Engineering and Infrastructure (E+I) will undertake the work over three states, with all buildings and facilities due to be completed early next year.
The NPI will be located ten kilometres from the mine's process plant, and close to its 2000 dwelling village.
It will be able to service a fleet of up to 142 pieces of equipment vehicles, and house around 250 staff.
Chris Palandri, Brookfield's WA managing director, described the NPI area as the "engine room" of the mine.
"The NPI is a critical component of the Roy Hill project. Because the mine is situated in such a remote region - about 100km from the nearest town - it’s imperative that provisions for the maintenance of vehicles and the administration and care of staff is readily available on site," Palandri said.
"The fleet service and repair facilities will ensure efficient transport of product and personnel across the mine, while the administration buildings will include training rooms, medical services and storage, to assist staff to safely complete their work.
"This is the second E+I contract for the Roy Hill project for Brookfield Multiplex, following the completion late last year of the mine accommodation village. We aim to exceed expectations and to ensure that the NPI facility will mirror the success of that project, which was delivered on time, on budget and of excellent standard.