<P> Mining contributed significantly to preventing potential bankruptcy for the early colonies in Australia . Silver and later copper were discovered in South Australia in the 1840s, leading to the export of ore and the immigration of skilled miners and smelters . The first economic minerals in Australia were silver and lead in February 1841 at Glen Osmond, now a suburb of Adelaide in South Australia . Mines including Wheal Gawler and Wheal Watkins opened soon after . The value of these mines was soon overshadowed by the discovery of copper at Kapunda (1842), Burra (1845) and in the Copper Triangle (Moonta, Kadina and Wallaroo) area at the top of Yorke Peninsula (1861). </P> <P> In 1851, gold was found near Ophir, New South Wales . Weeks later, gold was found in the newly established colony of Victoria . Australian gold rushes, in particular the Victorian Gold Rush, had a major lasting impact on Victoria, and on Australia as a whole . The influx of wealth that gold brought soon made Victoria Australia's richest colony by far, and Melbourne the island's largest city . By the middle of the 1850s, 40% of the world's gold was produced in Australia . </P> <P> Australia's population changed dramatically as a result of the gold rushes: in 1851 the population was 437,655 and a decade later it was 1,151,957; the rapid growth was predominantly a result of the new chums (recent immigrants from the United Kingdom and other Commonwealth states) who contributed the' rush' . Although most Victorian goldfields were exhausted by the end of the 19th century, and although much of the profit was sent back to the UK, sufficient wealth remained to fund substantial development of industry and infrastructure . </P> <P> Australia has mining activity in all of its states and territories . The Minerals Council of Australia estimates that 0.02% of Australia's land surface is directly impacted by mining . </P>

Where are australia’s current major mineral reserves located