CSR Sugar Mills Group executive general manager, Mark Day, says it is too early to determine when full production would resume at the mill.

"We are investigating solutions which will enable us to resume crushing as soon as possible," he said.

"However, we will, firstly, need to do a thorough investigation into today's incident to determine the cause."

Production ceased at Pioneer Mill this morning after a tank containing sugar juice and mud failed, causing damage to a neighbouring tank.

"One of our employees received a minor injury," Mr Day said.

"That person and two other employees were treated for shock and were taken to Ayr Hospital as a precautionary measure."

He said CSR Sugar was working with harvesting contractors and grower representative groups to organise for cane from the Pioneer milling area to be crushed at CSR's other Burdekin mills.

"We have made arrangements for harvested cane we already have at Pioneer Mill to be transported to Invicta, Kalamia and Inkerman mills to be crushed," he said.

"We are also working on a longer-term plan in relation to the crushing of Pioneer’s cane until the mill is operational again."

A total of about 80 employees and contractors were on site when the incident occurred.

"A full-site evacuation was activated and emergency services crews were called to the scene to assist our on-site emergency response team," Mr Day said.

Most employees were sent home after the evacuation was finalised, except for a team which assisted with the clean up.

CSR Sugar will make counselling available to all employees.

"We are assisting Division of Workplace Health and Safety officers with their investigation and conducting our own investigation," Mr Day said.

Contrary to early media reports, an explosion did not occur, he said.

"Our evacuation went extremely smoothly and everyone was accounted for quickly," he said.

"We thank the members of our on-site emergency response team and external emergency services crews for their assistance."