Australian Prime Minister Kevin Rudd today said the authorities will leave no stone unturned in helping the search for six Australian mining executives whose plane has gone missing in west Africa. <br/><br/>The chartered aircraft was carrying 11 people, including six Australians, two French, an American and two Britons. <br/><br/>Most of them were from Western Australia-based international mining company, Sundance Resources Limited, when it disappeared over dense jungle on Saturday. <br/><br/>Mr. Rudd said Australia's ambassador-designate to the area was on the ground, and Australian authorities were working with locals to try to locate the plane. <br/><br/>The CASA C-212 twin turboprop vanished during a flight from the Cameroon capital Yaounde to Yangadou in the Republic of Congo.