Papua New Guinea landowners have extended their blockade of the historic Kokoda Track and have threatened protests during Australian Prime Minister Kevin Rudd's visit next month.
Representatives of the Koiari people said an unsealed road where the World War II track begins just outside Port Moresby, has been blocked.
They say it will stay that way until Australian company Frontier Resources has its exploration licence renewed.
The Koiari people stand to make more than $100 million over 10 years if the company is allowed to mine a copper and gold deposit worth just over six billion US dollars.
