A WorkSafe investigation is underway after a cargo worker died after reportedly falling during a shift at his Mount Maunganui workplace.

St John paramedics were called to ISO Mount Maunganui on Tasman Quay about 2.30am on Saturday, August 16.

Photo: File.

Western Bay of Plenty territory manager Ross Clarke confirmed to Sunlive that two ambulance crews were sent to the premises and one transported a man to Tauranga Hospital in a serious condition.

A caller to SunLive said the worker was wearing a hard hat but suffered head injuries in a fall onsite.

He is understood to have died at Tauranga Hospital on August 22.

A WorkSafe spokesperson says the organisation was notified of the incident at IOS Mount Maunganui on August 16.

He confirmed an incident resulted in the man's death but could not comment further as an investigation is underway.

It is unknown how long the investigation will take but there is a statutory six month period where charges can be laid.

A Port of Tauranga spokesperson told SunLive the port is aware of the incident but will not be commenting as it is under investigation.

ISO Mount Maunganui is one of New Zealand's largest nationwide waterfront cargo logistics companies.

Ports nationwide include Marsden Pt; Auckland; Tauranga; Gisborne; Napier; Wellington; Nelson; Picton; Dunedin; and Timaru.

Calls made to ISO are yet to be returned.