Workers have announced they will carry out strike action at New castle' Port Waratah Coal Services tonight.
Four hour work stoppages will start at 11pm tonight, and will stake place every night for the next week.
Maritime Union of Australia national assistant secretary Ian Bray explained that although PWCS and the union are close to an agreement "there remain a few unresolved issues that the workers consider important enough not to walk away from and, as a result, the workers are taking this protected industrial action".
“We emphasise again, however, that we seek to reach agreement on those unresolved matters because we, like PWCS, would welcome a return to getting on with the business of shipping coal to PWCS clients.”
Earlier this month workers held two day strikes, after failing to reach an agreement over ten months of long running disputes.