AUSTRALIA'S BHP Billiton's mineral concession in north-eastern Cambodia is land mine free, the country's largest demining agency said Wednesday.

The Cambodian Mine Action Centre (CMAC) said it completed a two-year mine and unexploded ordnance clearance operation on the Mondulkiri property where BHP is exploring for bauxite.

"During the two-year de-mining mission, we assisted the company in its feasibility study of drilling 1,000 holes for bauxite," said Oum Phumro, deputy director general of CMAC.

The mission began in January 2007 and was finished at the end of March.