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Silver mining required large amounts of mercury to extract the metal from ore. In the Andes, the source was the Huancavelica mercury mine; Mexico was dependent on mercury from the Almadén mercury mine in Spain. Mercury had a high adverse environmental impact. [26] Silver was extremely valuable in China, and became a global commodity.
Silver mineralization was discovered in 1880 or 1881 in Presidio County, Texas. Mining began in 1883 at what became the town of Shafter. [33] At least six mines were worked. The deposits are manto-type deposits in Permian limestone of the Mina Grande formation, related to an igneous intrusive. Silver minerals include argentite and native
Bakewell, Peter J. Silver Mining and Society in Colonial Mexico: Zacatecas, 1540-1700. New York: Cambridge University Press 1971. Bakewell, Peter J. Miners of the Red Mountain: Indian Labor in Potosí, 1545-1650. Albuquerque: University of New Mexico Press 1984. Bakewell, Peter J., ed. Mining of Gold and Silver in the Americas. Brookfield, VT 1997.
Silver was removed by filtering and gold was then recovered by evaporating the liquid and heating the residue. Nitric acid was suitable for separating small quantities of gold from silver and aqua regia used to separate small quantities of silver from gold. Aqua regia acid process is used by refiners of scrap gold used in jewelry manufacturing.
16th century cupellation furnaces (per Agricola). Cupellation is a refining process in metallurgy in which ores or alloyed metals are treated under very high temperatures and subjected to controlled operations to separate noble metals, like gold and silver, from base metals, like lead, copper, zinc, arsenic, antimony, or bismuth, present in the ore.
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However, while gold and silver tend to move in tandem, silver's all-time high — also in 2011 — was just under $50 an ounce. Today, the price of silver is hovering around $30, so there's much ...
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