By Tom Westbrook
SYDNEY (Reuters) - Former finance minister James Marape was elected prime minister of Papua New Guinea on Thursday, and the critic of a major global gas development deal vowed to review management of the nation's resource riches.
Marape received 101 votes to eight in parliament in the capital, Port Moresby, a day after Peter O'Neill resigned having lost the support of the house after almost eight years in power.
Marape, who hails from the poor but gas-rich highlands of the South Pacific nation, said he would focus on "taking back our economy" and proposed an overhaul of mining, forestry and fishing laws.
"We will look into maximising gain from what God has given this country from our natural resources," he said in his maiden address to parliament.
"I have every right to tweak and turn resource laws for my country, then it will empower my citizens as well," he told the chamber to cheers and applause.
Political instability is not unusual in the poor but resource-rich country, but Marape's resignation from cabinet in April tapped into growing concern over governance and resource benefits not reaching the poor.
Those concerns ultimately led to O'Neill's downfall.
Marape told a news conference after he was sworn in at Government House that any changes to laws would not be retrospective.
But he has previously questioned an agreement with French oil company Total in April, which allows Total, Oil Search Ltd and ExxonMobil Corp to begin work on a $13 billion plan to double gas exports.
"We are not here to break legally binding project agreements," he told reporters when asked if he would consider reviewing another gas deal with Exxon critics say has failed to benefit landowners and the government.
However, he added: "If we find any project agreement ... that has not fully complied with proscribed provisions of law, then we are open to reviewing and scrutinising them," he said.
"We are not about breaking laws. We are about honouring existing laws."
Exxon has said it does not comment on politics. Oil Search and Total did not immediately respond to requests for comment.
Business leaders in Papua New Guinea offered cautious support for the new leader.
"He was finance minister so understands need for clarity and stability in policies," Isikeli Taureka, chairman of Kinabank and a former oil and gas executive at Chevron and InterOil, said in a text message.
"I believe he is rational and seems to lean towards respecting and grandfathering current agreements," he said.
The political uncertainty has knocked almost 6% from shares in Oil Search, an Australian partner in large liquefied natural gas developments in PNG, since the challenge to O'Neill gained traction last week.
ADVERTISEMENTOil Search shares climbed in early trade, but turned negative after Marape's election to trade 0.7 percent below Wednesday's close in a falling broader market.
(Reporting by Tom Westbrook; Editing by Paul Tait and Darren Schuettler)