Workers at GrainCorp's Port of Newcastle export operations have walked off the job, staging rolling strike actions as wage negotiations breakdown with the agribusiness giant.

Employees at the ports silos have rejected an offer they say falls below the minimum wage increase in July, as GrainCorp seeks to negotiate a new enterprise agreement with workers at its Newcastle facility.

A spokesperson for GrainCorp, which has exported about 1.2 million tonnes of produce from the Port of Newcastle this year, according to union estimate, reiterated their earlier response to the workers' strike on Tuesday , saying "we are continuing discussions with full transparency".

But the Newcastle branch president of the Maritime Union of Australia, one of two unions leading the strike, says he has had no

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