The Oroya Shoot (> 62 t Au) in the giant Golden Mile deposit, Yilgarn Craton, Western Australia is controlled by reverse faults, which offset altered quartz diorite porphyry but are crosscut by a late-mineralization kersantite dyke (> 2642 ± 6 Ma). Oroya stage 1 ore (12–14 g/t Au) is characterized by chert-like quartz, Fe-chlorite, siderite and pyrite (10–20 …

characteristics of refractory gold ores that occur in the hypogene environment of epithermal and mesothermal gold-silver telluride deposits. Metallurgical problems associated with gold-bearing tellurides and "invisible gold" (i.e., structurally bound gold and inclusions of native gold <1,000 Å in size) are addressed. The use of secondary ion

Calaverite, a gold telluride mineral (AuTe2) that is a member of the krennerite group of sulfides and perhaps a structurally …

With a telluride-type gold ore flotation concentrate as the research object, the Na 2 S + NaOH collaborative leaching process was applied to selectively separate tellurium before the cyanide leaching of gold and silver. The effects of process parameters including the type of leaching agent, the amount of leaching agent, liquid-solid ratio, …

Gold–(silver) telluride deposits normally contain a dozen or more different telluride and selenide minerals and present complex ore textures. An example is seen in the ores of the recently discovered Sandaowanzi gold deposit, where sylvanite is the most abundant gold-bearing mineral and together with petzite and krennerite accounts for …

The ore − forming materials of telluride gold deposits may be partly derived from the deep mantle, and they are consistent in provenance and channel. At the same time, the intrusion of alkaline magma also provides the necessary conditions of sufficient heat energy and water for gold mineralization, ...

PDF | On Nov 1, 2021, A. D. Izvekova and others published Gold–Telluride Mineralization in Ore of the Pionerskoe Gold–Quartz Deposit (Eastern Sayan, Russia) | Find, read and cite all the ...

Ore bodies in rocks of the crystalline basement (A-type alkaline deposits) contain epithermal gold-telluride (Au-Te) mineralization, which is new for Central Aldan ore district.

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 …

Calaverite is an ore of gold. It is also rare collector's mineral, with special value due to its gold content. The bulk of collector's specimens of Calaverite are from several of the mines in the Cripple Creek District, Teller Co., Colorado, including the Ajax/Cresson, Doctor, El Paso, Mary McKinney, Molly Kathleen, Portland, and Vindicator Mines.

The Sandaowanzi gold-telluride deposit, with a total reserve of ≥ 25 t of Au and an average grade of 15 g/t, is located in the Great Hinggan Range Metallogenic Belt in NE China. This deposit is the first reported case of a dominantly Au (±Ag)-telluride deposit in this area and it reveals highly economic bonanza Au- and Ag-telluride ores. Ore …

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For the investigated gold telluride containing ore, 20% of the gold is absorbed by the cupel, and 36% is found in the slag: the fire assay technique is only determining 44% of the total gold. Roasting the ore at 650 °C for 24 or 72 h in the presence of air before the fire assay permits to increase the reported gold from 44% to 57 and …

The most satisfactory method of identification of the tellurides is by means of chemical and etch tests on polished sections of ores under the reflecting microscope. The technique and application of this method are fully described by Short. 1 In his systematic scheme of identification the unknown is first treated with standard etch reagents ...

The ore formation process is long, multistage, but in general, in most deposits, three productive stages are distinguished - the early pyrite-quartz association with finely dispersed gold is replaced by (gold) -polysulfide-quartz and ends with a …

Gold-bearing Tellurides. by Harvey S. Eastman, August 29, 1999. G old-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 ...

For the investigated gold telluride containing ore, 20% of the gold is absorbed by the cupel, and 36% is found in the slag: the fire assay technique is only determining 44% of the total gold. Roasting the ore at 650 °C for 24 or 72 h in the presence of air before the fire assay permits to increase the reported gold from 44% to 57 and …

This paper presents the results obtained by processing a gold and silver telluride mineral concentrate from a mine in Colombia. An acid wash, also known as acidification, was carried out, followed by oxidation with nitric acid as a pretreatment. Cyanidations of the pretreatment residues were carried out and the results were …

The gold-bearing minerals that contain tellurium are called 'tellurides'. The Golden Mile deposit in Kalgoorlie, Western Australia, is a massive deposit containing greater than …

Depending on temperatures, scavenging of Au by Bi(Te) melts, or partial melting of a pre-existing ore, may offer alternatives to generate telluride-rich gold ores. Pressure variation, e.g., by throttling, appears to impact on telluride deposition and distribution in any given deposit. The Tetradymite Group – Old Friends Revisited

Mineralization of Te and Se was found in gold deposits and uranium occurrences, located in the Paleoproterozoic greenstone belts in Northern Fennoscandia. These deposits are of different genesis, but all of them formed at the late stages of the Svecofennian orogeny, and they have common geochemical association of metals Au, …

The low gold extraction can be attributed to the fact that some of the gold in the ore occurs as gold telluride minerals having slow dissolution characteristic in cyanide solutions, which results ...

the aim of the present work is to study a pretreatment with. nitric acid as an alternative to improve the recov er y of gold. from ores associated with gold and gold-silver tellurides. 2 Materials ...

Gold-(silver)-telluride (selenide) ores occur as epithermal orogenic and intrusion related deposits. Although Te and Se are chalcophile elements and share geochemical affinity with Au, formation of selenides and other elements Ag-Au require acidic or reducing environments. The thermodynamic stability conditions for Au and …

abundance of Bi-telluride species, commonly stable together with native bismuth. Gold-Bi compounds, such as maldonite and/or jonassonite, contribute to the mineralogical balance of gold ore, instead of Au(Ag)-tellurides (Ciobanu et al., 2005). A modified definition of the term 'gold-telluride deposits' was thus proposed (Cook and

Gold- (silver)-telluride- (selenide) deposits are not described as a. discrete class of ore deposit. Many fall, instead, into the more familiar. classes of epithermal, orogenic and intrusion ...

In copper ores, tellurium forms stable crystalline compounds (called tellurides) of gold, silver, bismuth, mercury, platinum and palladium that …

A telluride is a compound of two elements, one of which is the element tellurium. An interesting aside is that tellurium is a metaloid, meaning it contains characteristics of metals and nonmetals. Calaverite and sylvanite are major telluride ores of gold, although such ores are minor sources of gold in general.

The ore deposits are fracture fillings; most occur at the intersections of well- defined fracture zones with massive, moderately resistant rocks. The most im­ portant hosts for ore are the San Juan breccia and the Cutler and Telluride formations; less important hosts, because they are thinner, are the breccias of

The question as to whether cyanide can successfully recover gold from gold-telluride ores has long been debated. The simplest and most common association of …