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Mining chief Andrew `Twiggy' Forrest said his main idea was improving infrastructure.

"We should allow the private sector, being the marketplace, to determine what infrastructure is required for Australia,'' he said.

"It is amazing to me that we have infrastructure regulation leading to something like Dalrymple Bay where you have got infrastructure regulators telling owners what their rate of return should be on expansion.

"The whole of our coal industry of our country gets held to ransom. Let the market determine what infrastructure is required.

"Secondly, if that infrastructure is held by private hands, have step in rights for government to expand that infrastructure if the proponents do not. So the people of Australia are never held to ransom by infrastructure owners but we can also get private sector ideas and capital to resolve infrastructure issues in Australia.''