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Gold bearing gravel

Peruvian Incas used elemental mercury to wash gold-bearing gravel as early as 1557. The original extraction process, which took place over 20 to 30 days, underwent subsequent modification, leading to the ability to extract gold in a pan over a fire in less than 6 hours by the 1830s. With some modifications this process continues to be used to this day, especially in Central and South America, Africa, and the Philippines. [Pg.101]

Yeend WH (1974) Gold-bearing gravel of the ancestral Yuba River, Sierra Nevada, California. USGS Prof Pap 722 44 pp... [Pg.118]

See other pages where Gold bearing gravel is mentioned: [Pg.45]    [Pg.3]    [Pg.315]    [Pg.85]    [Pg.67]    [Pg.45]    [Pg.3]    [Pg.315]    [Pg.85]    [Pg.67]    [Pg.310]    [Pg.915]    [Pg.915]    [Pg.314]    [Pg.559]    [Pg.199]    [Pg.282]   
See also in sourсe #XX -- [ Pg.67 ]



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