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Carlin–type gold deposit

These deposits are characterized by invisible (typically microscopic and/or dissolved) gold in pyrite and arsenopyrite This dissolved kind of gold is called Invisible Gold as it can only be found through chemical analysis The deposit is named after the Carlin mine the first large deposit of this type discovered in the Carlin Trend NevadaGet price

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Malheur County targeted for gold uranium mines

8-1-2012Up to a dozen gold deposits similar to Grassy Mountain dot the high desert between Plans call for the ore to be crushed and mixed with an acid solution first thrust Grassy Mountain into the consciousness of Oregonians in the late 1980s and early '90s when Newmont Gold Co proposed introducing Nevada-style open-pit cyanide Get price

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Geologic Trips Sierra Nevada

Geologic Trips Sierra Nevada by Ted Konigsmark ISBN 0-9661316-5-7 GeoPress gold deposits were rich and others were low grade Some of the deposits were at or near the surface of the ground Others extended hundreds or thousands of feet underground Some of the gold ore was hard and difficult to process Other gold ore was soft and easy to Get price

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Properties

Unpatented Northern Nevada Lode Claims (portal + 40 acres) Lyon County close to Fort Churchill 5-acre mill site Washoe County ia City Foothills Spectacular view of Reno and the mountains Easy access drive right up in your motor home Also available original vintage 6-wheel ore car and other mines and mill sites Serious Inquiries only Get price

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Photos of gold ores quartz telluride gold ore and gold

Tellurides are often associated with rich ore - and that was true at Cripple Creek as it was elsewhere This is a piece of gold ore from the famous Witwatersrand gold deposits of South Africa The ore consists of conglomerate pebbles mostly of quartz in a sandy matrix with abundant pyrite in the cement Get price

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Petrophysical and physicochemical controlling parameters

The Long Canyon deposit is a sediment-hosted gold deposit located in northeastern Nevada fine-grained pyrite growth within Fe-rich host rocks Results indicate stable isotope depletion mapping around carbonate-hosted ore bodies with sufficient sample density can provide far field vectors to fluid flow paths beyond what traditional Get price

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Where was the Comstock Lode of silver found?

He found silver The Comstock Lode is a lode of silver ore located under the eastern slope of Mount Davidson a peak in the ia Range in Nevada (then western Utah Territory) It was the first major discovery of silver ore in the United States Get price

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Mining Scams

Perhaps the next major consideration in evaluating a mineral investment is the sample and assay data One sample does not make a mine A person who brings a rock that contains two ounces of gold per ton to an investor may be carrying the entire mine in his hand One such high-grade ore specimen is not representative of the deposit Get price

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Geology of Porphyry Copper Deposits

Here let's understand the geology of porphyries and iron oxide copper gold deposits or IOCG as they are known These are somewhat the giants of the ore deposits world As a mining interested learner the geology of porphyry copper deposits is vital to your education Get price

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Comstock Lode

Comstock Lode rich deposit of silver in Nevada U S named for Henry Comstock part-owner of the property on which it was discovered in June 1859 ia City Washoe and other mining "boomtowns" quickly arose in the vicinity and in 10 years the lode's output justified establishment of aGet price

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Gold Deposits

Gold Deposits Homestake Mine located in western South Dakota was created in 1876 Since the first production in 1878 almost 28 million troy ounces of gold have been extracted worth 987 million dollars at present price causing the mine to be the most valuable in the United States Get price

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Rcovery of gold in pyritic ores

I will say that from my understanding many seem to agree that in sulfide gold ores the occurrence of gold appears to occur as a replacement of other minerals possibly iron One USBM paper summed up five noticeable characteristics of auriferous pyritic ores The gold occurs as tiny flakes on the crystallographic planes of the pyrite Get price

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Florence Mine Goldfield Goldfield Mining District

Florence Mine Goldfield Nevada Bonanza Ore High grade Epithermal ore This is a very rare uncut specimen from the famous Little Florence lease of the Florence Mine it weighs about 3 pounds The specimen contains Alunite Bismuthinite Goldfieldite Cryptocrystalline Quartz and Native Gold The gold in the rich ore is so fine (around 250 Get price

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Silver mining in Nevada

The Comstock Lode had been a minor gold placer district since 1849 In 1859 several prospectors discovered its rich lode silver ore and a great rush of miners poured eastward from California and established Gold Hill and ia City the principal towns of the Comstock Lode The district has been mostly inactive since the 1920s Get price

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The Geology of Coarse Gold Formation

In some districts fine gold is all there is - and as a result there are basically no placers formed This is the main reason why some rich hard rock gold districts don't have much in the way of associated placers The most productive gold vein district in Nevada (not including the Carlin type depositsGet price

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Minerals in Nevada – Nevada Mining Association

Gold is used in connectors switch and relay contacts soldered joints connecting wires and connection strips Most of the ways that gold is used today have been developed only during the last two or three decades This trend will likely continue As our society requires more sophisticated and reliable materials our uses for gold will increase Get price

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The Geology and Ore Deposits of Goldfield Nevada

This report describes the geology and ore deposits of Goldfield Nevada This report describes the geology and ore deposits of Goldfield Nevada Skip to main content Gold mines and mining -- Nevada Gold mines and mining Language English Item Type Get price

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Ore Fluid Properties and Sources from Quartz

Ore Fluid Properties and Sources from Quartz-Associated Gold at the Betze-Post Carlin-Type Gold Deposit Nevada United States associated with the Screamer ore zone in the western part of the deposit Ore fluids were increasingly diluted by meteoric fluids with distance as ore fluids along with Au and trace element-rich pyrite Fluid Get price

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State Specific Information on Gold Other Minerals

Many rich gold lodes were quickly discovered and Colorado soon became a major mining area In the 1870's important ore discoveries were made in the San Juan Mountains the Sawatch Mountains and in the Leadville-Breckenridge area Gold ore was found in the important Cripple Creek district in 1891 USGS Professional Paper 610 GeorgiaGet price

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A GOLD

The discovery of platinum-bearing gold ore at the Boss mine in southern Nevada was brought to the attention of the Geological Survey by Mr F A Hale jr in September 1914 Some samples of the ore were submitted at the same time These were assayed and found to be extraordinarily rich in gold platinum and palladium Get price

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Mineral paragenesis and ore fluids at the Turquoise Ridge

Mineral Paragenesis and Ore Fluids at the Turquoise Ridge Gold Deposit Nevada hy Michiko Shigehiro Dr JeanS Cline Examination Comminee Chair Associate Professor of Geoscience University of Nevada Las Vegas In this study mineral assemblages and related fluid inclusions at the Turquoise Ridge Carlin-type goldGet price

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Supergene oxidation of bonanza Au

Supergene gold of high fineness chlorargyrite (AgCl) and alunite occur in veinlets and vugs in the upper 30 m of bonanza Au-Ag veins at the Sleeper deposit Humboldt County Nevada Gold and silver were leached from the primary electrum under acidic conditions caused by iron-sulfide oxidation Get price

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2 2 Porphyry

In the porphyry-epithermal mineral system pathways for fluids and their contained metals ligands and sulfur include faults stratigraphic aquifers and crystallising intrusive bodies Crystallising intrusions are particularly important pathways for high-temperature proximal deposits such as porphyry Cu-Au-Mo deposits and Cu-rich skarns Get price

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Magmas to Metals Melt Inclusion Insights into the

This project applies innovative melt inclusion and mineralogical techniques to characterize several distinctive magma types occurring together with prodigious critical rare earth elements (REE) and gold-(antimony-tellurium) ore deposits within the U S Get price

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Malheur County targeted for gold uranium mines

8-1-2012Up to a dozen gold deposits similar to Grassy Mountain dot the high desert between Plans call for the ore to be crushed and mixed with an acid solution first thrust Grassy Mountain into the consciousness of Oregonians in the late 1980s and early '90s when Newmont Gold Co proposed introducing Nevada-style open-pit cyanide Get price

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Gold in porphyry copper deposits its abundance and fate

Gold abundances in porphyry copper deposits vary greatly complicating efforts to define gold-rich porphyry copper deposits The original definition was based on the Au/Mo ratios of porphyry copper deposits with no reference to their copper content and resulted in the suggestion that gold-rich deposits were found largely in island arc regions Get price

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Photos of Natural Silver Ore Silver

Rich lead - silver ore from the famous mines of Wallace Idaho These mines have been mined to very deep levels below the surface Dark colored high grade ruby silver ore (pyrargyrite) from the rich Nevada Mines at Battle Mountain in Lander County Get price

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Tusc pit (Tusc ore body) Gold Quarry Mine (Maggie claims

Tusc pit (Tusc ore body) Gold Quarry Mine (Maggie claims Nevada Bureau of Mines Geology Sample Site No 1560 Deep West Ore Body) Maggie Creek Mining Subdistrict Carlin Trend Eureka Co Nevada USA Structure The Good Hope fault system which strikes N40W and dips steeply SW is a narrow reverse fault that strikes N45W and has highly Get price

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Gold Geology Prospecting Arizona

Gold Geology Prospecting Arizona This deposit was rich in gold In 1901 rich gold ore was found in shallow prospects dug on the Tom Reed vein in the southern part of the district This was followed by a rush in 1902 resulting in discovery of the Gold Road vein Get price

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Geochronology of the Midas Low

ithermal deposit along the middle Miocene northern Nevada rift Located in the historic mining district of Midas previ-ously known as the Gold Circle district (LaPointe et al 1991 Fig 1) the deposit consists of a complex of steeply dipping quartz-adularia-calcite-precious metal bonanza veins hosted by Get price

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