The spill was apparently just 73.5 litres of oil which was released from one of the Stag platform's fixed legs, according to information obtained by The West. 

The spill occurred when the offloading hose became loose and fell away from the Dampier Spirit floating production and offloading vessel. Sources confirmed the spill.

Jadestone has notified the national regulator about the incident. A helicopter was sent and reportedly observed a sheen of oil on the surface of the water near the platform. 

The spill occurred the same week that Jadestone lodged an application to overhaul its production operations at its Stag oilfield offshore Western Australia with the National Offshore Petroleum Safety and Environmental Management Authority. 

Jadestone announced in early September its plans to retire the Dampier Spirit floating production and offloading vessel at its Stag oil field. 

The Dampier Spirit, contracted by Jadestone from Teekay Shipping Australia, was used for more than three decades as a tanker and then a production vessel tied to Stag oil field wells. 

Jadestone is now looking to use tankers instead of an FSO to produce from its Stag field. The tankers will directly offload oil from the Stag field platform, eliminating the need for a storage facility. 

Under the new, simplified model, Jadestone believes it will save at least 20% in operating costs and leasing fees associated with an FSO. 

Jadestone has formally submitted its plans to the National Offshore Petroleum Safety and Environmental Management Authority for approval. 

Following approval from NOPSEMA the field's production offloading operations will no longer fall under the purview of the regulator. 

Instead the tankers will be regulated by the Australian Maritime Safety Authority.