Greens leader Bob Brown says he's concerned at the growing influence of Australian mining firms in Papua New Guinea.
A year out from PNG national elections, the United Resources Party (URP) reportedly raised $600,000 at a weekend function in Port Moresby attended by a number of international business leaders including one of Australia's richest men Clive Palmer.
The URP has six members of parliament including Petroleum and Energy Minister William Duma, Environment and Conservation Minister Benny Allen and Tourism Minister Guma Wau.
Mr Palmer, who owns half the PNG-focused oil and gas company Chinampa Exploration, reportedly told the function PNG was entering "a new era".
"This is the promised land and with a stable government and support from the community, this country can take off," the Post-Courier newspaper quoted him as saying.
"You have gas, oil and other resources.
"There is a lot of opportunity here and the government must create the right environment."
Senator Brown, who visited PNG two weeks ago, told reporters in Canberra on Tuesday the growing influence of Australian mining companies was troubling.
"It is very, very troubling ... in a marvellous country like PNG where democracy ought to be based on a fair go for everybody," Senator Brown said.
"I'm very concerned about that and ... will be continuing to raise this issue in parliament."
Mr Palmer has show a keen interest in PNG in recent years, throwing his weight behind a bid to introduce a PNG team in the National Rugby League competition.
He is the single biggest contributor to the Liberal National Party in Queensland and in 2009/10 donated $500,000 to the federal Liberals, according to the electoral commission website.
A spokesman for Mr Palmer told AAP he was unavailable for comment as he was in Hong Kong launching the float of Resourcehouse.