The main contractor at the Bull Arm fabrication site has confirmed a worker died there on Sunday.

"The cause of death is believed to be from natural causes, and is being confirmed," Kiewit-Kvaerner Contractors said in a statement. 

The worker's name has not been released. 

A gravity-based production platform for the Hebron project is being built at Bull Arm, the Trinity Bay industrial site where much of the Hibernia platform was built in the mid-1990s.