what is small scale gold mining united states

Reducing Mercury Pollution from Artisanal and Small-Scale ... A major source of air pollution from mercury, artisanal and small-scale gold mining releases approximately 400 metric tons of airborne elemental mercury each year. Located in over 55 countries, small scale gold buying and refining facilities (commonly referred to as "Gold Shops") are an important part of this production process, and are a major cause of air pollution from mercury. Gold: History of Use, Mining, Prospecting, Assay & Production Gold as a Medium of Exchange. Nations of the world today use gold as a medium of exchange in monetary transactions. A large part of the gold stocks of the United States is stored in the vault of the Fort Knox Bullion Depository. Mining History in the United States – Legends of America Mining History in the United States, written by Albert S. Bolles 1879, from the book Industrial History of the United States, Volume IV. ... The California gold fever of 1849 was the beginning of the search and procurement of that metal on a considerable scale. ... the pan process for silver, the hydraulic process of gold mining in alluvial ...    Read More