Characteristics Of Epithermal Deposits

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Textural Characteristics of Noncrystalline Silica in

The quartz veins in low-sulfidation epithermal deposits exhibit a wide range of textural characteristics [14 15 16 17] Previous works [16 18 19 20] have proposed that some of the quartz textures encountered in epithermal veins are of secondary origin and formed as a result of recrystallization of a noncrystalline silica precursor phase

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Epithermal gold deposits Styles characteristics and

Here we highlight the general characteristics of the two principal styles of epithermal mineralization in which gold is the dominant economic metal We base our generalizations on observations of many deposits and prospects in the circum-Pacific region Distinguishing between the two styles is crucial for effective exploration

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Late Cretaceous porphyry Cu and epithermal Cu–Au

important porphyry Cu and epithermal Cu-Au deposits Until the mid-1990's the epithermal Cu-Au deposits in the intensively mineralised central part of this zone known as the Panagyurishte mineral district (Bogdanov 1980) were described by most of the authors as "volcanic-hosted massive sulphides"

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The Mt Carlton high

High-sulfidation epithermal (HS) deposits occur in volcanic arc settings around the world These deposits are sought-after by mining companies due to their endowment in precious and base metals and due to their genetic connection to porphyry copper deposits The aim of this thesis is to enhance our understanding of HS deposits and how to

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CHARACTERISTICS OF EPITHERMAL DEPOSITS AND THE

The tectonic backgrounds of epithermal deposits are mainly island arc and arc-back extension belt Most deposits of the type are formed in Cenozoic with minority in Mesozoic and Palaeozoic The structure of ore are of vein stockwork and breccia The ore bodies are charaterized by specific mineral assemblage element belting and alteration zoning

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Petrographic Analysis of Bonanza Epithermal Vein

The Buckskin National deposit and the Fire Creek deposit in northern Nevada contain similar silica textures to other epithermal deposits and can exhibit specific characteristics that are controlled by the complexity of hydrothermal events ore-fluid evolution and water-rock chemical reactions with wall rocks of varying composition

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Chemical variations in tetrahedrite

association among the deposits The lateral distribution of minerals allows for the exposure of a cross-section of the mineralized column at the present level of erosion from porphyry (Bruncu Sa Casa sector) to peripheral veins having epithermal characteristics (S Miali - Is

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Lithocaps

Cooke DR ORCID: 0000-0003-3096-5658 White NC Zhang L Chang Z and Chen H 2017 'Lithocaps – characteristics origins and significance for porphyry and epithermal exploration' in Proceedings of the 14th SGA Biennial Meeting: Mineral Resources to Discover Society for Geology Applied to Mineral Deposits pp 291-294

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EPITHERMAL GOLD DEPOSITS

EPITHERMAL GOLD DEPOSITS-AdU ppt - Free ebook download as Powerpoint Presentation ( ppt) PDF File ( pdf) Text File ( txt) or view presentation slides online

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Characteristics of a low

/ Characteristics of a low-sulfidation epithermal deposit in the River Reef Zone and the Watuputih Hill the Poboya gold prospect Central Sulawesi Indonesia : Host rocks and hydrothermal alteration In: Minerals 2017 Vol 7 No 7

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Economically Significant Gold Deposits

Greenstone Deposits • Defined as "all except VMS deposits in Precambrian greenstone belts" and are mainly quartz veins and vein systems formed in association with late-tectonic reduced porphyry dikes and plugs However in the group are low sulfidation epithermal deposits and sediment-hosted deposits • Two age subtypes: 1

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Epithermal Gold 2012

content and descriptions of ore deposits Porter GeoConsultancy continued its International Study Tour series of professional development courses during May 2012 by visiting a representative selection of the different styles and the most important examples of epithermal gold deposits on the western margin of the Pacific

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Epithermal Gold Deposits

12-7-2013Epithermal 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

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Epithermal deposits: geological characteristics and

Epithermal deposits: geological characteristics and genetic processes for exploration and discovery One day short course Sunday 17 November Presenter Stuart Simmons at stuarthotsolutions nz Short course description Epithermal deposits are diverse

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VTEM™ AIRBORNE EM AEROMAGNETIC AND GAMMA

1 vtem™ airborne em aeromagnetic and gamma-ray spectrometric data over the cerro quema high sulphidation epithermal gold deposits panama presented at aseg-pesa 2015 – perth australia

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Hydrothermal mineral deposit

Porphyry deposits account for most of the copper and molybdenum world production 60 and 95 percent of its supply respectively Porphyry-type ore deposits form in hydrothermal fluid circulation systems developed above and around high-level subvolcanic felsic

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Controls on the characteristics timing and distribution

Wedin Francis 2013 Controls on the characteristics timing and distribution of epithermal gold deposits in western Turkey PhD Thesis Cardiff University

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characteristic features of gold ore washer

Gold Facts - Uses Properties Atom Structure Jewelry Check out these amazing gold facts uses and properti Gold has long been a symbol of wealth in the form of expensive jewelry coins and various works of art It also features incredible characteristics from a scientific point of view Learn more about this famous metal and its unique atom

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Alkalic porphyry and epithermal deposits

Alkalic porphyry and epithermal deposits - A view from outside the Macquarie Arc David R Cooke1 Richard M Tosdal2 Claire M Chamberlain2 and Cari L Deyell1 1 Centre for Excellence in Ore Deposit Research University of Tasmania Private Bag 79 Hobart Tas 7001

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Anatomy of Porphyry

epithermal deposits classed as the chalcedony-ginguro banded epithermal Au-Ag (formerly adularia-sericite) veins and studies of magmatic arc geothermal systems such as those in the Philippines (Mitchell and Leach 1991 Corbett and Leach 1998) provide better analogies to many porphyry and epithermal deposits (Corbett 2008)

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Geophysical signatures of copper

Geophysical signatures of copper-gold porphyry and epithermal gold deposits and implications for exploration Thesis submitted by Terence Hoschke BSc (hons) Submitted in partial fulfilment of the requirements for the Degree of Master of Science (Exploration Geoscience) University of

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Epithermal Ore Deposits and Transition to the Porphyry

Epithermal deposits also form in extensional settings with somewhat different mineralogy and metal characteristics but with hydrothermal processes similar to those in arcs Information from active hydrothermal systems including fluids flow paths and mineralogy is useful when applied to exploring their extinct equivalents

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Epithermal gold deposits of the southwest Pacific

Read Epithermal gold deposits of the southwest Pacific Journal of Geochemical Exploration on DeepDyve the largest online rental service for scholarly research with thousands of academic publications available at your fingertips

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Epithermal Deposit

23-4-2014Epithermal (shallow heat) deposits are mineral deposits comprising veins irregular branching fissures stockworks breccia pipes or replacement bodies containing precious metals orsometimes base metals that are usually found among volcanic or sedimentary rocks

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Characteristics of High Sulphidation Epithermal Gold

This compilation presents a summary of the geological and exploration characteristics of some key Mio-Pliocene age (23 to 2 5 million year old) High Sulphidation Epithermal (HSE) gold-silver deposits of the Chile – Argentine Cordillera including information on the

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Exploration Framework for Porphyry to Epithermal

The Toodoggone district in northeastern BC hosts numberous epithermal-type mineral deposits and occurrences and porphyry mineralization Existing geochronological results indicate that the porphyry and at least some of the highly-varied epithermal systems are formed around the same time and as a result of the same processes

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Variable Characteristics of Ore Deposits in the Epithermal

The general features of ore deposits in the epithermal environment are influenced by their tectonic magmatic and geologic affiliations (Sillitoe and Hedenquist 2003) Alteration and ore minerals plus textures and zonation patterns are highly variable and are defining characteristics These variations have implications for the

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Types Characteristics and Geodynamic Settings of

to alkaline complex ( Hu et al 2006 ) these epithermal deposits formed in three pulses at 145 – 135 127 – 115 and 10 – 94 1 Ma ( Fig 1 Table 1 ) and are spatially and tempor-ally related to Mesozoic volcanic activity 4 Typical epithermal gold deposits 4 1 General characteristics of the

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EXPLORATION FOR EPITHERMAL AU

Figure 1 Locations of principal epithermal deposits in the circum Pacific rim (modified after Fig 6a of Hedenquist et al 2000) There are a wide variety of classification schemes for epithermal deposits (e g see Table 1 of Simmons et al 2005) although most recognise two end

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epithermal gold deposits

Epithermal mineralizations are found for the most part in the Los Ranchos and Tireo formation where the sulfide deposit of Pueblo Viejo (Cotu) (Au Ag Zn) is classified a world-class deposit with more than 20 million ounces of gold in resources the Deposit of Managu (Au Ag) and the Centenario (Au) and Candelones (Au) deposits

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An Overview of Epithermal Gold Deposits

24-5-2019Aside from epithermal deposits classic examples of lode deposits include VMS deposits and Carlin-type deposits Epithermal deposits are distinctive from low-grade bulk tonnage deposits such as porphyries in that they are typically high-grade small-size deposits A few other characteristics distinguish epithermal deposits

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