The Queensland Government could take legal action against Gold Coast theme park Dreamworld.

A safety report following last year's fatal ride malfunction, which led to the deaths of four people, has been completed.

But Queensland Industrial Relations Minister Grace Grace says the Workplace Health and Safety report will not be publicly released.

“The report has now been handed over to the WHSQ prosecutions unit to determine the legal consequences of the investigation and the next course of action,” Ms Grace said.

“That process is expected to take several months.

“Given the possibility of pending legal action, the investigation report cannot be released at this time.”

Cindy Low, Kate Goodchild, her brother Luke Dorsett and his partner Roozbeh Araghi died on the Thunder River Rapids ride in October 2016.

In August this year, the Government said it intended to make “industrial manslaughter” an offence, after an earlier independent review into the incident.

At the time, Ms Grace could not confirm whether the legislation would be used in relation to the incident.

Visitor numbers remain down at Dreamworld, with a 30 per cent reduction in June compared to the same time in previous years.