Australian gold rushes been found on his station at Clunes in March 1850. Bruhn also explored the countryside and found quartz reefs in the vicinity. "This information he promulgated through the country in the course of his journey." One of the people to whom Bruhn communicated this information was James Esmond who was at that time engaged in erecting a building on James Hodgkinson's station "Woodstock" at Lexton about 16 miles (25 km) to the west of Clunes. This then indirectly led to the first gold rush in Victoria from Esmond's subsequent discovery of payable gold at Clunes in July 1851. Bruhn also
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