Mining services player WestStar Industrial is about to announce the biggest contract win so far for its engineering business.

The company (ASX:WSI) went into a trading halt on Monday ahead of news of a “material contract award” to subsidiary SIMPEC.

Stockhead understands it is the largest contract ever awarded to the newly created SIMPEC, worth close to $10m.

The contract is for work on a Western Australian project.

The news follows another significant contract win with mining giant Rio Tinto (ASX:RIO).

WestStar shares rallied last week on news that SIMPEC had won a $4m contract for Rio’s West Angelas iron ore mine in the Pilbara.

This prompted an “aware” query letter from the ASX over the way in which it announced the major contract win.

WestStar has requested a halt until the start of trading on Wednesday.