Construction officially “started” last month when the blade casting factory was hailed by Business Secretary Vince Cable as part of the Government’s economic growth plans.

But the engineering giant declined to reveal the name of the winning contractor until now with Bam finally confirmed as the builder.

Bam regional director James Wimpenny told the Yorkshire Post: “Rolls-Royce is investing significant money.

“It’s great we are involved in it. It is good for the area and it is good for the region.

“It is one of the first significant private sector investments in some time.”

Bam is also tendering for another larger factory on the site.

A Bam spokesman said: “It’s very significant for us because we have not got a pre-existing relationship with Rolls-Royce.

“It gives us an opportunity to impress them.

“It is not just this job for us – it’s an opportunity to show Rolls-Royce what Bam can do as a contractor.”

The new facility will manufacture high technology single crystal turbine blades for large civil aero engines and will create 150 jobs.

The Advanced Blade Casting Facility is expected to produce its first blades in late 2014, with the facility capable of manufacturing 100,000 blades per year when fully operational.

Bam will oversee construction and fit-out of the blade factory which will have a total development value of £80m.