In what is becoming a regular event at the country's largest open cut coal mine more jobs have been cut - this time in the mine's supply department with 25-30 positions believed to have been lost.

Although unable to confirm any specifics a representative from the company confirmed a review of all functions within BHP Billiton’s Coal business is underway.

"All business organisational changes as a result of the review will be completed by the end of June 2015.  For each function, the implications will be different," the representative says.

News of the review reached Mount Arthur Coal on Monday the same day BHP Billiton Chief Executive Officer, Andrew Mackenzie, addressed investors in Sydney.

He spoke about what the future holds for the company and the proposed demerger.

"For BHP Billiton’s Coal business, the move will see our portfolio become 40 per cent smaller in annual production terms, managed operations drop from 19 to 12 and geographic spread decrease," he said.

 "As a result of this change, Coal will streamline its organisational design to better serve our core portfolio."

"This means we will further simplify our management structure, reduce duplication and aggregate functional support; leverage our common systems and processes to deliver continual improvement, and; move a greater proportion of high volume, routine work through shared service centres."

We were informed of the review yesterday and at this stage we are not sure what functional roles will be affected at our site but some managers may have already discussed this with their teams, the representative said.

Earlier this month the company announced 150 workers will be made redundant by the end of February 2015 as a part of an ongoing internal review.

At the time the company's energy coal asset president, Peter Sharpe said it was part of the global miner's ongoing review to reduce operating costs and ensure the long-term sustainability of the business.

He said market conditions continue to be difficult because of low coal prices. 

Since July 315 job losses have been announced at Mt Arthur thereby reducing the workforce to approximately 1,500 workers.