So far only two groups of male boatpeople have been sent to PNG's Manus Island since Prime Minister Kevin Rudd announced the new policy, which has been criticised by refugee advocates, two weeks ago.
But under the directive designed to deter people from making the dangerous boat journey to Australia, all asylum-seekers will be processed in PNG and ultimately resettled there even if found to be genuine refugees.
The statement said this would be partially funded from a Australian dollar 423 million reduction over the four years to 2016-17 in the operating costs of the Australian onshore detention centres asylum-seekers have previously been sent to.
"Capital costs of Australian dollar 194 million are included in 2013-14 to expand Manus Island facilities," it added, with the camp's current capacity of around 500 expected to be expanded to house at least 3,000.
Australia will also spend Australian dollar 19 million on deployments to the Pacific nation's prison and police services, Australian dollar 800,000 on scoping and design for the Madang-Ramu highway and send some 50 Australian police to local stations to help in tackling chronic law and order problems.
The government said the aid was in addition to the existing Australian dollar 500 million a year delivered to PNG and would be funded from within existing aid budgets.
Australia announced the new policy on asylum-seekers last month after a record number of boatpeople arrived in 2013 -- more than 17,300 -- and a spate of drownings.
Since the policy was announced, more than 1,500 asylum-seekers have arrived by boat.
