DIAB Engineering awarded contract for crusher and supporting infrastructure maintenance at the new Iron Bridge magnetite mine.

The contract is valued at about A$30 million over three years with an optional two-year extension and is expected to begin in May.

At its peak, the contract will employ about 50 personnel.

RCR Mining Technologies has won a $34 million contract for the design and construction of a primary crushing facility for the Christmas Creek Hall Hub development project.

It comes after RCR successfully delivered the Hopper 10 crushing facility at Fortescue's Cloudbreak mine earlier last year.

RCR is partnering with another NRW subsidiary, Primero Group, which will provide engineering support and construction services.

NRW also announced that it had acquired Bunbury-based OFI Group Holdings for about $4 million.

The business specialises in industrial electrical engineering, automation, switchboard design and manufacture, instrumentation and design and construction across multiple sectors, including mining.

OFI is expected to generate $40 million of revenue next financial year.

"NRW continues to enhance its capabilities and opportunities within its METS division," Argonaut analyst Ian Christie said.

NRW shares were up 5.5% to $2.215 after reaching an eight-month low late last week.