A bulldozer moves salt at Rio Tinto's Dampier Salt facility in Port Hedland, about 1,600 km (960 miles) north of Perth June 23, 2010. Australia's government has pitched to mining firms a compromise offer on a controversial tax, a newspaper said on June 30, 2010 in a move that could clear the path for new Prime Minister Julia Gillard to call an election. [Agencies]