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High-grade gold ore specimen from the mine Chalcopyrite-Quartz specimen from the Camp Bird mine, 600' Stope, 2100' Level. Size: 5.2 x 3.6 x 2.7 cm. Click and scroll down for an enlargement. The Camp Bird Mine is a famous and highly productive old gold mine located between Ouray and Telluride, Colorado.
Kautz had the 60 lb troy (22.4 kg) nugget etched with acid to remove most of the quartz; the resulting gold leaf specimen is 44 lbs troy (16.4 kg). A small piece of the original rock was left in the back to show the original matrix. Kautz opened a museum devoted to the history of gold mining in the area, to display the gold specimen.
Calaverite, or gold telluride, is an uncommon telluride of gold, a metallic mineral with the chemical formula AuTe 2, with approximately 3% of the gold replaced by silver. It was first discovered in Calaveras County, California in 1861, and was named for the county in 1868. The mineral often has a metallic luster, and its color may range from a ...
The main Hollinger gold mine operated from 1910 until 1968. During that period 65,778,234 tons were milled, producing 19,327,691 ounces of gold, indicating an overall grade of 0.29. The value of the gold produced is placed at $564.7 million. Hollinger Consolidated Gold Mines was later acquired by Canadian tycoon E. P. Taylor 's Argus Corporation.
Gold extraction. Cyanide leaching "heap" at a gold mining operation near Elko, Nevada. On top of the large mounds of ore, are sprinklers dispensing a solution of cyanide. Gold extraction is the extraction of gold from dilute ores using a combination of chemical processes. Gold mining produces about 3600 tons annually, [1] and another 300 tons ...
Classification. Iron oxide copper gold (IOCG) deposits are considered to be metasomatic expressions of large crustal-scale alteration events driven by intrusive activity. The deposit type was first recognised by discovery and study of the supergiant Olympic Dam copper-gold-uranium deposit (Olympic Dam mine), and South American examples.