From Wikipedia, the free encyclopedia

Silver mining

From Wikipedia, the free encyclopedia

"Silver mine" redirects here. For other uses, see Silvermine (disambiguation).

An underground silver mine in Baden-Württemberg, Germany

Silver mining is the resource extraction of silver by mining.

Silver is found in native form very rarely as nuggets, but more usually combined with sulfur, arsenic, antimony, or chlorine and in various ores such as argentite (Ag₂S), chlorargyrite ("horn silver," AgCl), and galena (a lead ore often containing significant amounts of silver). As silver is often found in conjunction with these or alloyed with other metals such as gold, it usually must be further extracted out through amalgamation or electrolysis.

Silver mining has been undertaken since ancient times. As silver is a precious metal often used for coins, its mining has historically often been lucrative. As with other precious metals such as gold, newly-discovered deposits of silver ore have sparked silver rushes of miners seeking their fortunes. In recent centuries, large deposits were discovered and mined in the Americas, influencing the growth and development of Mexico, Andean countries such as Bolivia, Chile, and Peru, as well as Canada and the United States.

Contents

[hide]

· 1 History

o 1.1 Americas

· 2 Ore processing

· 3 Production areas

· 4 See also

· 5 References

· 6 External links

[edit]History

Early silver Athenian coin, 5th century BCE. British Museum.

Silver has been known since ancient times. It is mentioned in the Book of Genesis, and slag heaps found in Asia Minor and on the islands of the Aegean Sea indicate that silver was being separated from lead as early as the 4th millennium BCE. The silver mines atLaurium were very rich and helped provide a currency for the economy of Ancient Athens. It involved mining the ore in underground galleries, washing the ores and smelting it to produce the metal. Elaborate washing tables still exist at the site using rain water held in cisterns and collected during the winter months.

Extraction of silver from lead ore was widespread in Roman Britain as a result of Roman mining very soon after the conquest of the first century CE.

From the mid-15th century silver began to be extracted from copper ores in massive quantities using the liquation process creating a boost to the mining and metallurgy industries of Central Europe.

[edit] Americas

Silver Spanish real from the silver of Potosí, Bolivia. The amount of silver mined at Potosí and other locations in the Spanish Empire led to significant inflation in Europe.

Vast amounts of silver were brought into the possession of the crowns of Europe after the conquest of the Americas from the now Mexican state of Zacatecas (discovered in 1546)^[1] and Potosí (Bolivia, also discovered in 1546), which triggered a period of inflation in Europe. The conquistadorFrancisco Pizarro was said to have resorted to having his horses shod with silver horseshoes due to the metal's abundance, in contrast to the relative lack of iron in Peru. Silver, which was extremely valuable in China, became a global commodity, contributing to the rise of the Spanish Empire. The rise and fall of its value affected the world market.

In the first half of the 19th century Chilean mining revived due to a silver rush in the Norte Chico region, leading to an increased presence of Chileans in the Atacama desert and a shift away from an agriculture based economy.

Silver mining was a driving force in the settlement of western North America,^[2] with major booms for silver and associated minerals (lead, mostly) in the galena ore silver is most commonly found in. Notable silver rushes were in Colorado; Nevada; Cobalt, Ontario; California and the Kootenayregion of British Columbia; notably in the Boundary and "Silvery" Slocan. The first major silver ore deposits in the United States were discovered at the Comstock Lode in Virginia City, Nevada, in 1859.

[edit]Ore processing

Silver is commonly extracted from ore by smelting or chemical leaching. Ore treatment by mercury amalgamation, such as in the patio processor pan amalgamation was widely used through the 1800s, but is seldom used today.

Silver is also produced during the electrolytic refining of copper and by application of the Parkes process on lead metal obtained from lead ores that contain small amounts of silver. Commercial grade fine silver is at least 99.9 percent pure silver and purities greater than 99.999 percent are available.

[edit]Production areas

The principal sources of silver are copper, copper-nickel, gold, lead, and lead-zinc ores obtained from Canada, (such as Cobalt, Ontario); Mexico (such as Batopilas); Poland; Peru;Bolivia; Australia; and the United States.

Mexico was the world's largest silver producer in 2010. According to the Silver Institute, it produced 128.6 million troy ounces (3,999 metric tons) in 2010, about 17 percent of the annual production of the world.^[3] In 2010, total global mine production of silver was approximately 735 million troy ounces.^[4][5]

Top 6 Production Stage Silver Mines ^[6]
Mine	Country	2010 Production
Cannington Silver/Lead/Zinc Mine	Australia	38.6 Moz
Fresnillo Silver Mine	Mexico	38.6 Moz
San Cristobal Polymetallic Mine	Bolivia	19.4 Moz
Antamina Copper/Zinc Mine	Peru	14.9 Moz
Rudna Copper Mine	Poland	14.9 Moz
Peñasquito Polymetallic Mine	Mexico	13.9 Moz

Top 6 Near-Term Silver Mine Development Projects Through 2015 ^[7]
Project	Country	Anticipated Annual Production Capacity (due within five years)
Pascua Lama	Chile	25.0 Moz
Navidad	Argentina	15.0 Moz
Juanicipio	Mexico	14.0 Moz
Malku Khota	Bolivia	13.2 Moz^[8]
Hackett River	Canada	13.1 Moz
Corani	Peru	10.0 Moz

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