A WorkSafe New Zealand spokeswoman said it was notified of an incident which took place on Moutohorā Island last week. While she confirmed it had opened an investigation, it was unable to make any further comment, she said.
Trustpower TECT Rescue Helicopter airlifted the injured person to Tauranga Hospital which pilot Liam Brettkelly said was a straightforward rescue.
"He just fell off a walking track and landed on rocks below, about seven metres we think.
"We had to winch him out, using the winch from the helicopter. We were only out there for maybe an hour."
The Department of Conservation, which administers Moutohorā Island and its tracks, is also investigating the fatal fall.
Senior community ranger Mike Jones confirmed all tour operations on the island have been suspended until further notice while investigations were ongoing