Workers at the General Motors assembly plant, also known as the CAMI plant, in Ingersoll, Ont., have reached a tentative contract settlement with the automaker. 

The new collective agreement covers approximately 2,700 production and skilled trade workers at the plant. Details won't be released until the deal is ratified. A ratification meeting is set to take place Sunday in London, Ont., with results expected in the evening.

Local bargaining committee chair Mike Van Boekel said he's "extremely confident" that the proposed four-year deal will be approved by union members. The current contract was set to expire Monday.

Unifor, the union representing Canada's auto workers, signed a master agreement with General Motors in 2012 covering more than 5,500 workers in three facilities across Ontario. Union members at the CAMI plant, however, were not included in the agreement. 

An early round of contract talks began in February, but Unifor said more negotiations were needed to reach a deal. 

Workers at the CAMI plant manufacture the Chevrolet Equinox and GMC Terrain vehicles.

With files from The Canadian Press