Australian gold rushes 5000 ounces (57 kg). In January 1851, before Hargraves' find of gold in February 1851 at Ophir near Orange in New South Wales which started the first Australian gold rush, George Hermann Bruhn had left Melbourne to explore the mineral resources of the countryside of Victoria. On his trek Bruhn found, on a date unknown, indications of gold in quartz about 2 miles (3 km) from Edward Stone Parker's station at Franklinford (between Castlemaine and Daylesford). After leaving Parker's station Bruhn arrived at Donald Cameron's station at Clunes in April 1851. Cameron showed Bruhn samples of the gold that had
Gold in California Both during the Gold Rush and in the decades that followed, gold-seekers also engaged in "hard-rock" mining, that is, extracting the gold directly from the rock that contained it (typically quartz), usually by digging and blasting to follow and remove veins of the gold-bearing quartz. By 1851, quartz mining had become the major industry of Coloma. Once the gold-bearing rocks were brought to surface, the rocks were crushed and the gold separated, either using separation in water, using its density difference from quartz sand, or by washing the sand over copper plates coated with mercury (with which gold forms an