Victorian gold rush in the Melbourne "Argus" on 8 September 1851, leading to a rush to the Mount Alexander or Forest Creek diggings, centred on present-day Castlemaine, claimed as the richest shallow alluvial goldfield in the world. These discoveries were soon surpassed by Ballarat and Bendigo. Further discoveries including Beechworth in 1852, Bright, Omeo, Chiltern (1858–59) and Walhalla followed. The population of Melbourne grew swiftly as the gold fever took hold. The total number of people in Victoria also rose. By 1851 it was 75,000 people. Ten years later this rose to over 500,000. Surface alluvial gold was the first to be exploited.
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