Gold–(silver) tellurides are important accessory minerals, carrying a significant proportion of the gold endowment in some low to medium temperature hydrothermal vein deposits. Gold–(silver) telluride minerals have become one of the most important sources of gold in the world.
Jan 01, 2009· Whereas this model fits some telluride-bearing Au deposits (e.g., Gold-(silver)-telluride (selenide) ores occur as epithermal orogenic and intrusion related deposits.
Gold-silver tellurides gold ores from historic mines of Colorado, U.S.A., I. Figure 1. Two small samples courtesy of Dr Bruce Geller, now curator of the Colorado School of Mines Museum, Golden, Colorado, March 2006. The sample at top (2521) is from the Gold Hill area of Boulder county, in the foothills west of Boulder, exact locality unknown.
The tellurides of the platinum group elements, as with most discrete minerals of the PGE, are generally microscopically small, 0.05 mm in diameter. Gold deposits associated with alkalic igneous bodies commonly contain tellurides, including the gold-silver tellurides petzite, sylvanite and krennerite, and the Au telluride calaverite.
Ultrathin silver telluride nanowire films and gold nanosheet electrodes for a flexible resistive switching dev. Role of Nanostructuring and Microstructuring in Silver Antimony Telluride Compounds for Thermoelectric Applications. The anticoagulant properties of cadmium telluride quantum dots.
Oct 03, 2010· Calaverite or gold telluride is an uncommon telluride of gold mineral with chemical formula (AuTe 2). It was discovered in Calaveras County, California, in 1861 and named for the county. The color ranges between brass-yellow and silvery-white with green to
Jan 01, 2005· Gold-bearing tellurides are silvery to pyrite-yellow, commonly striated, unlike gold, which is a deeper yellow and rarely crystalline. Some mineral indicators of gold tellurides were observed that assisted in its detection.
Gold ore associated with Telluride is hardly soluble in ordinary cyanide solutions and special treatment is necessary for its extraction. There are two methods in use in such cases. Roasting The ore is ground dry to about 30 mesh and roasted; it is then ground to a slime in water or cyanide solution, usually in grinding pans, utilizing the opportunity simultaneously to amalgamate any gold that
Gold-silver tellurides gold ores from historic mines of Colorado, U.S.A., II. Figure 1. Small rock chips of telluride ores from the old Cresson mine at Cripple Creek, Teller county, Colorado.On the left is a fine-grained alkalic igneous rock (phonolite), a sawn piece (sample 1824) of material collected by Kenny Mumford in 1956 (purchased from David Shannon Minerals in 1997).
High Grade Gold and Silver Telluride Ore about 3 Oz. Condition is New. Shipped with USPS First Class. I have quite a few of these, anywhere from a few ounces to a few pounds. This particular auction is for about 3 ounces. They are extremely fragile, and can easily break up during shipping.
Petzite: A gold and silver telluride that is mostly silver. Silver content is usually three times that of gold. Nagyagite: This is a complex mineral containing gold, tellurium, sulfur, lead, antimony and bismuth that occurs in epithermal veins. Hessite: This mineral is a silver telluride.
The basis of this procedure is to leach in dilute cyanide (0.1%) at pH 9.5 for 24 hours to dissolve native gold but not gold+silver tellurides (Stage 1), followed by a strong cyanide (2%) leach at
Gold-bearing tellurides loom large in the history of gold mining in Colorado.These mineral species are found in the San Juan Mountains, the La Plata Mountains, and at Cripple Creek. Other major localities in the United States include the huge gold fields of the Sierra Nevada foothills in California.
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.
Jan 01, 2005· Gold tellurides are treated commercially in a small number. The leaching of telluride ores has always been problematical with a perceived mismatch of findings between the researchers and the operators as to the recoverability of gold by cyanide leaching of gold-telluride ores without some form of oxidative pre-treatment step.
The Kalgoorlie gold field is characterised by rich gold-telluride lodes and gold quartz stocks. In the Fimiston lodes gold occurs as free gold, in gold or gold-silver tellurides or locked up with pyrite. The presence of tellurides in the Golden Mile was first recognised by Holroyd in 1895
Tellurium and gold are gre:11tly enriched and silver is moderately so. The mercury in the gold bearing veins probably was emplaced during the waning and cooling stages of mineralizatio'1, Such an inter pretation is strongly supported by the occurrence of late-stage cinnabar in the Cresson mine, where it locally coats the gold tellurides.
A telluride of gold and silver. It can assay as high as 20% gold. Petzite Another telluride that is mostly silver. Silver content is usually tw that of gold. Hessite Resembles Petzite. Usually about 60% silver. Sulfides A sulfide is a reduced salt of sulfur. Like copper sulfide, CuS2. An oxidized salt of copper and sulfur would be Copper
An increase in the silver to gold ratio with increase in depth in the main ore shoot of the Crown-Crescent lode in the Emperor gold mine, Fiji, was found to be due mainly to vertical zoning of gold-silver tellurides. The zoning resulted from a two-stage sequence of ore mineralization. The application of
Feb 12, 2010· Gold telluride ores are important gold refractory ores due to the presence of sulfides and other gangue materials. The classification and main physical properties of gold telluride ores were described, and possible treatment methods including flotation, leaching, and oxidation were reviewed. The results show that flotation procedures are much easier for gold tellurides compared to other
Timmins Gold Corp. Initial telluride values related to gold and silver values indicate that part of the mineralization could be in the form of silver and gold tellurides as is the case at the san francisco mine.A follow up drill program initially planned to drill 20,000 metres was commenced in 2013 and was cut short at the end of june after