Efforts will begin on Saturday in Solomon Islands to refloat a wrecked ship at the centre of an environmental disaster.

Photo: The Australian High Commission Solomon Islands

Since early February, bulk carrier, Solomon Trader, has been wedged on a reef off Rennell Island, where it has spilled an estimated 100 tonnes of oil.

The spill happened near a protected marine area and poisoned local water supplies and fishing grounds, sparking an international outcry.

More than three months on, the Solomon Islands Disaster Management Office said the vessel will be refloated and towed from the reef.

Its director, Loti Yates, said the process, which is being led by a salvager contracted by the shipowner's insurer, will take around three days.

"It is a huge and very, very difficult operation," he said.

Mr Yates added that cleanup efforts which began in March are ongoing, with oil still coating the shoreline of the nearby and once pristine Kangava Bay.

He added that all oil onboard the ship had been removed but based on ship records there was an unknown amount missing.

"Maybe they evaporated, maybe they just sailed away or sunk into the bottom of the ocean. Not sure yet."

Mr Yates said investigations by the Solomon Islands government into the disaster had been obstructed by a missing data drive taken from the ship by its owner.

He said requests for the data - which is too big to transfer online - to be sent physically had gone unanswered for the past three weeks.

"We are sort of frustrated but we are still hoping that it will arrive." </s> The ship at the centre of an environmental disaster near World-Heritage listed waters in the Solomon Islands was refloated Saturday after being stranded on a coral reef for more than three months.

The MV Solomon Trader ran aground on February 5 while loading bauxite at Rennell Island, about 240 kilometres (149 miles) south of the capital Honiara.

The 225-metre (740-foot) ship was carrying more than 700 tonnes of heavy fuel and leaked a huge amount of oil into the sea, sparking an international effort to contain the spill.

"They have been trying to refloat the vessel since Thursday but because of low tide they have not been able to, until today", the chairman of the Solomons National Disaster Council, Melchior Mataki, told AFP.

An oil slick more than six kilometres long has spread along the shoreline, destroying the livelihoods of islanders who rely on waters in the ecologically delicate region.

Rennell Island is the largest raised coral atoll in the world and includes a UNESCO World Heritage site which extends kilometres out to sea.

Authorities have said the site was not affected by the spill, although Mataki said a detailed environmental assessment will be undertaken now that the vessel is out of the way.

"There is a preliminary report but the full report will be made known once assessments and investigation findings are compiled properly", he said, adding the government would likely seek compensation for environmental damage.

The Australian government had sent salvage experts to assist the response and vowed to help the Solomons make sure those responsible for the spill are held to account.

The Hong Kong-registered ship was chartered by Indonesian-based Bintan Mining and was loaded with almost 11,000 tonnes of bauxite at the time of the incident.
Efforts begin in Solomon Islands to refloat a ship after an oil spill in what the government says will be a "very difficult operation."