There are reports of more safety issues at Gina Rinehart's Roy Hill project.

While the $10 billion iron ore mine is nearing completion, word has surfaced that a worker slipped through a loose section of grid mesh on a walkway during a late night shift on Sunday.

The employee of a subcontractor brought in by head contractor Samsung C&T sustained minor injuries, according to a Roy Hill spokesperson, after an incident “involving a loose piece of grid mesh”.

“Samsung and its subcontractors have taken proactive measures across the entire operations to ensure a repeat incident of this nature does not occur again,” the spokesperson said.

“Samsung C&T and its contractor are currently completing an investigation into the incident.”

Reports say the incident interrupted work at some sections of the project.

The WA Department of Mines and Petroleum says it was made aware of the incident early on Monday morning, and will now liaise with the company.

Roy Hill - which is 70 per cent-owned by Gina Rinehart's Hancock Prospecting - has been hit by a string of safety incidents, leading to some strong media attention.

The Department of Mines and Petroleum issued 11 “improvement” notices in the 2015 financial year, while nine severe “prohibition” notices were also handed down to the Roy Hill project.

Another prohibition notice came this year after a man cage crashed into scaffolding while being lowered by a crane.

Roy Hill chief executive Barry Fitzgerald has attempted to defend the safety record, claiming it was “more so a media profile priority”, than a dodgy history.

The 55 million tonne-a-year iron ore project is expected to start running in October.