This image taken between 1920-1930 depicts open-cut hydraulic sluicing at the Three Mile Mine, located about five kilometres south of Beechworth. Alluvial, or surface, mining began on this site in the 1850s, but was soon replaced by hydraulic sluicing methods. By the start of 1880 it is estimated that nine hundred miles of water races had been cut though soil and rock in the Beechworth district. Hydraulic sluicing employs high pressure jets of water to blast away large areas of earth and wash it down to be run through a sluice box. Gold gets caught in the sluice and the remaining slurry is washed away. Large water quantities were required for hydraulic sluicing, and the long water races and deep tailraces that were constructed were considered great engineering feats. This method of mining is extremely effective, but causes significant environmental damage and impacts to waterways and agricultural operations. Miners at Beechworth built extensive networks of races and dams to secure reliable supplies of water on a scale far greater than elsewhere in Victoria. By the 1880s Beechworth's water barons continued to hold more than half of all the water right licences on issue and undertook sluicing operations on a massive scale. The manipulation of surface and ground water via race networks was well planned and recorded in detail by local mining surveyors. The maps that were created, combined with modern geo-spatial technologies, provide a vital key in understanding the great lengths to which miners went to capture and control critical water resources. Today, Three Mile mine is called Baarmutha. The Three Mile Mine was unproductive until 1865 when John Pund and three other miners secured a fifteen year license and constructed a water race from Upper Nine Mile Creek to Three Mile Creek. In the early twentieth century Pund & Co. averaged over one thousand ounces of gold per year from the mine. After Pund's death in 1915, GSG Amalgamated Co operated the site, continuing sluicing until 1950. This image of hydraulic sluicing methods shows the extent of water-works engineering in the landscape. This photograph has historic and research potential for understanding changes to the landscape, the evolution of mining methods, and the extensive construction, manipulation and management of water networks in the Beechworth district. Black and white rectangular photograph on matte paperReverse: 7597-1 / Sluice Mining / Copied from original on loan from Webb (Qld) / Donated Nov 2009 / Baarmutha Three Mile Mine c1920-1950 / Managed by the Plain Bros then Parkinsons / Current Location is: Beechworth Animal Shelter / used for Baarmuthaburke museum, beechworth museum, beechworth, gold fields, gold rush, victorian gold rush, hydraulic sluicing, spring creek, netwown falls, mining tunnels, water races, tailraces, gold ming history, colonial australia, australian gold rushes, mining technology, beechworth historic district, indigo gold trail, indigo shire, john pund, water manipulation, water engineering, three mile creek, three mile mine, water race, large-scale mining methods, historical mining construction, alluvial mining, mining environmental impacts, baarmutha, water barons