Silver Ore


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Silver Ore

 

any of the natural mineral formations containing Ag in such compounds and quantities that commercial use is technically feasible and economically profitable. The principal minerals of silver ores are argentite, pyrargyrite, polybasite, proustite, stephanite, and silver-bearing galena. The ores often contain native silver. Silver ore deposits are most closely associated with granitoids, as well as with subvolcanic and volcanic rocks, occurring either in these rocks or in the surrounding rocks. In the belt of silver-bearing deposits stretching for 4,000 km across North and South America, silver ores are present in lead, lead-zinc, gold-silver, and silver deposits (Pachuca, Guanajuato, and Zacatecas in Mexico; Cerro de Potosí and Cerro de Pasco in Peru; Potosí in Bolivia).

Silver deposits as such are relatively rare and count for little in total world supply and output. Between 80 and 90 percent of the silver is extracted as a by-product from deposits of complex ores, mainly from lead-zinc (45 percent), copper (18 percent), and gold-silver (10 percent) ores. Between 10 and 20 percent is extracted from silver’s own ores. The lower limit of Ag content in deposits deemed economically profitable to extract varies from 45-50 to 350 grams per ton.

Annual silver production in capitalist and developing countries amounts to 7,000-8,000 tons; proven and potential reserves of silver in these countries are put at 110,000 tons, including reserves of 40,000 tons in the United States, 23,000 in Mexico, 20,000 in Canada, and 16,000 in Peru). Canada, Peru, Mexico, the United States, and Australia lead the world in the mining and production of silver. In the USSR, silver is chiefly extracted from complex and gold-silver ores.

REFERENCE

Kuznetsov, K. F., and R. V. Panfilov. “Mestorozhdeniia serebra.” In Rudnye mestorozhdeniia SSSR, vol. 3. Moscow, 1974.

G. A. MIRLIN [23–888–]

References in periodicals archive ?
The Spanish discovery of the cinnabar deposit at Huancavelica, Peru around 1560 proved vital for the prosperity of silver mining in the New World because the "patio process" for the amalgamation of silver ores (invented in Pachuca by Bartholome Medina in 1554 and used widely in the New World thereafter; see later) required mercury.
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A small underground void was added in an area that had an overlap of solids within the silver ore body and resulted in a minor change in reportable silver grade and tonnes.
Most collectors know that pyrargyrite is a silver ore, just as azurite is a copper ore, and this adds a human element to the specimens.
The silver ore in the stockpile was mined by Van Silver Explorations Ltd.
The Company's assets include five exploration properties, including the Tumipampa property, as well as its 220 tpd gold and silver ore processing mill at Acari.
For ex- ample, the principal silver ore minerals at Guanajuato are members of the acanthite-naumannite system ([Ag.
Total proved, probable and possible reserves in Nicaragua have been estimated by INMINE to be about 26 Mt of gold and silver ore.
As proposed, the project would produce 60,000 tonnes per day of gold and silver ore, over a mine life of 17 years.
Lessees occasionally shipped small lots of hand-cobbed silver ore, while also collecting rhodochrosite specimens and cleavage fragments which they traded for drinks in the Alma bars.
Silver ore of that type, he said, had been collected clandestinely by the locals for 40 or 50 years, but because of its special character they had not succeeded in extracting pure silver from it.