In Western Australia a 200 km long dolerite dike, the Norseman-Wiluna Belt is associated with the non-alluvial gold mining area between Norseman and Kalgoorlie, which includes the largest gold mine in Australia, the Super Pit gold mine. West of the Norseman-Wiluna Belt is the Yalgoo-Singleton Belt, where complex dolerite dike swarms obscure the volcaniclastic sediments. Large dolerite sills such as the Golden Mile Dolerite can exhibit coarse grained texture, and show a large diversity in petrography and geochemistry across the width of the sill. Early Jurassic activity resulted in the formation of dolerite intrusion on Prospect Hill in Sydney, and quarrying of basalt for roadstone and other building materials has been an important activity there for over 180 years.