GR Engineering Services (ASX:GNG) was appointed as the preferred contractor by Ora Banda Mining (ASX:OBM) for the engineering, procurement, and construction works for a 3-million-tonnes-per-annum process plant as part of the Davyhurst expansion project in Western Australia, according to a Monday Australian bourse filing.

The estimated contract value is AU$233 million, and an early works agreement has been executed, the filing said.

The company's shares were down nearly 1% in recent Monday trade, while Ora Banda Mining's shares were up about 2%.