When they do return to work, they will likely see a fall in wages and conditions.

It comes as the national president of the CFMEU - the union the represents the terminal workers - called on PKCT to cease work in the wake of Thursday's truck accident where a driver lost his leg.

The lockout is the latest in a series starting on February 27.

Workers were due to return on Monday but now they will remain outside the gates until April 2.

The last time the coal terminal employees worked a shift was January 18; taking in this latest lockout that will be 74 days off the job.

The lockout also extends beyond the March 29 expiry date of the workers' current enterprise agreement.

After that date workers will fall back to the award, which was not as generous as the EA.

According to a notice from PKCT general manager Kurt Baumgart to the employees the lockout comes after "the company has reviewed the level of disruptions to the operations of protected industrial action".

READ MORE: Behind the drama at the coal terminal

Meanwhile, CFMEU national president Tony Maher called on the terminal to stop loading coal due to safety concerns.

"We urge the PKCT management team to cease operations until a thorough risk assessment has been conducted, with assistance from union health and safety representatives," Mr Maher said.

A PKCT spokeswoman said "operations not associated with road receival have resumed".

"PKCT's primary focus remains on the injured man and ensuring he and his family receive the necessary support and care."

She said PKCT "is working closely with SafeWork NSW and it has also instigated a separate external investigation into the incident".