Gold mining is the resource extraction of gold by mining. As of 2016, the worlds largest gold . Placer mining is the technique by which gold that has accumulated in a placer deposit is extracted. Placer deposits are These are small machines that float on the water and are usually operated by one or two people. A suction
Gold extraction refers to the processes required to extract gold from its ores. This may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore. Gold mining from alluvium ores was once achieved by techniques . and T Green - goldavenue Archived 2002-04-01 at the Wayback Machine.
Feb 22, 2018 New Mercury-Free Mining Resource from UN ENvironment on the high density of gold relative to other minerals in ore or alluvium mixture. . at the top of the machine in a slurry of around 60-75% water and 40-35% solids.