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Native gold (Au) occurs in this rock as colloform bands, partially replaces breccia clasts, and is also disseminated in the matrix. Published research indicates that Sleeper Mine rocks represent an ancient epithermal gold deposit (hot springs gold deposit), formed by volcanism during Basin & Range extensional tectonics.
The Mule Canyon mine exploited shallow, low-sulfidation, epithermal Au-Ag deposits that lie near the west side of the Northern Nevada rift in northern Lander County, Nevada. Mule Canyon consists of six small deposits that contained premining reserves of about 8.2 Mt at an average grade of 3.81 g Au/tonne. It is an uncommon mafic end member of low-sulfidation Au-Ag deposits associated with ...
Ore deposits: Classification vs Modeling Each ore deposit is unique like a person's finger print This uniqueness arises out of : ¾fundamental differences in processes and environments ¾local, site-specific geologic variations And produces an extremely large variation in characteristics ¾If we group the deposits according to their characteristics, we get a
Although they are a product of the same igneous system, low sulfidation epithermals gold deposits are very different from high sulfidation. In low sulfidation the main control for Gold deposition, is fluid boiling – caused by a drop in the confining pressures the fluid approaches the surface. This below is an image of a simple low sulfidation vein system, with all its components preserved ...
Hydrothermal gold deposits (epithermal, Carlin-type, and orogenic) have accounted for >75% of lode-gold production. Although these deposits form in distinctly different geologic settings and by ...
Corbett: Epithermal Gold For Explorationists Paper 2002-01, April 2002 5 mineralogical differences used to categorise the styles of low sulphidation epithermal gold deposit styles (Corbett and Leach, 1998) . The third order in the classification of low sulphidation epithermal gold deposits (Figures 1 & 2) is
Factors other than tonnage and grade come into play in calculating the economic significance of an epithermal deposit. For instance, the presence of other metals in the ore can increase the value of a deposit, and many epithermal deposits contain a significant silver and/or copper content. The price of gold
Epithermal Gold Deposits Part II Geology and Gold Deposits of the Oatman District, Northwestern Arizona By Ed DeWitt, Jon P. Thorson,1 and Robert C. Smith2 Abstract Mines in the Oatman mineralized district, near Oatman in northwestern Arizona, have produced more than 1.98 million ounces of gold from mid-Tertiary, epithermal, silver-
Other articles where Epithermal deposit is discussed: mineral deposit: Veins: .are commonly referred to as epithermal, a term retained from an old system of classifying hydrothermal deposits based on the presumed temperature and depth of deposition. Epithermal veins tend not to have great vertical continuity, but many are exceedingly rich and deserving of the term bonanza.
A fascinating group and characteristic of Epithermal gold deposits is that you can virtually see them forming today, simply by visiting hot springs. Like those with Yellowstone in Wyoming or Rotorua in New Zealand. This photo is Pamukkale, low sulfidation hot springs in Turkey, with a beautiful white centre terraces. If you like hot springs, you'll love epithermal. Let's start where we ...
Feb 02, 2012· When digging, mining an epithermal deposit, the surrounding rock formations are usually permeated with associated minerals and gold. As you go deeper the hotter deposits are found and the gold bearing lode narrows to cracks filled with quartz and the easiest of metals to reduce.
Some metallurgical implications to these gold ore types are summarised below: Placers, quartz vein gold ores and oxidized ores: Generally, placers, quartz vein gold ores and oxidized ores are free-milling and gold can be recovered by gravity and/or direct cyanide leaching. Some epithermal deposits may be free-milling (such as the
Epithermal deposits are a type of lode deposit.They contain economic concentrations from a precious metal such as gold and silver, and in some cases base metals such as copper, lead, iron ore and ...
Jul 07, 2017· Geology of Gold deposits - How Gold deposits form_Volcanoes, Yellowstone, sulfur and iron Epithermal - Duration: 34:08. Chris Ralph, Professional Prospector 9,403 views
Jul 01, 2011· The salinity and temperature of ore-forming fluids have wide ranges. Salinities of some ore-forming fluids are lower than sea water, whereas those in fluids forming porphyry deposits can reach 80 wt.% NaCl (Heinrich, 2007).The salinity and temperature of most hydrothermal fluid decrease during the late-stages of ore formation, suggesting either the attenuation of heat and fluid source or the ...
Mineral deposit - Mineral deposit - Hydrothermal solution: Hydrothermal mineral deposits are those in which hot water serves as a concentrating, transporting, and depositing agent. They are the most numerous of all classes of deposit. Hydrothermal deposits are never formed from pure water, because pure water is a poor solvent of most ore minerals.
within epithermal ore zones. Boiling is the process that most favors precipitation of bisulfide-complexed metals such as gold. This process and the concomitant rapid cooling also result in many related features, such as gangue-mineral deposition of quartz with a .
Epithermal deposit types can be very high grade, but if not oxidized can be refractory. Nevada has the enormous benefit of infrastructure with multiple mills competing for feed to maintain efficient ore processing facilities. This is a tremendous advantage in Nevada because it allows small sulfide resources to become economic.
• On the on-going exploration for giant High Sulfidation Epithermal (HSE) Gold deposits in the Chile – Argentine Andes • Provide a synopsis of the exploration signatures • Exploration process and results -to-date from a Joint Venture (JV) partnership between a TSX-V listed junior company ... deposit economics. Funnel shaped ore body ...
Oct 17, 2019· Epithermal gold deposits are among the richest gold deposits in the world with some bonanza grade ore shoots containing more than 1000 g/t gold, or in other words, a kilogram of gold for every tonne of rock mined. Unfortunately, the tonnage of ore in epithermal veins is typically small compared with other types of lower grade gold deposits. Gold mineralisation within epithermal veins .
Deposits of this type are mined for the predominant metals, but the gold is also recovered as a byproduct during processing of the ore. Most byproduct gold has come from porphyry deposits, which are so large that even though they contain only a small amount of gold per ton of ore, so much rock is mined that a substantial amount of gold is ...
Epithermal Gold Deposits | Geology for Investors
3 Ore and Gangue The mineralogy of ores shows considerable overlap, but there are several pronounced differences, based on a compilationof mineral data for more than 130 epithermal deposits .
Figure 4: Epithermal Deposits Environments Epithermal ore deposits are formed in the crust when the fluids are directed through a structure where the temperature, pressure and chemical conditions are favourable for the deposition of ore minerals, including native gold.
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