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characteristics of epithermal deposits

Epithermal Gold Deposits Characteristics

Epithermal Gold Deposits Characteristics. And here is a spectacular exposure of a porphyry and epithermal pair in Southern Java. The porphyry intrusion outcrops as a small, steep island on the right of the image and a genetically related high sulfidation epithermal deposit curves on the mainland on the left of the image.

Characteristics and Genesis of Epithermal Gold Deposits

Low- and high-sulfidation and hot spring epithermal gold deposits are dealt with as one genetic gold class. Alkalic epithermal and porphyry gold deposits are dealt with as a separate gold deposit class owing to their specific host-rock association and element enrichment e.g., Mo, F, Be, Hg, W, and Sn .

CHARACTERISTICS OF HIGH-SULFIDATION EPITHERMAL DEPOSITS

epithermal deposits in order to account for the variations observed in styles of mineralization and inferred genetic environments. Among the numerous classifications that followed, one group of deposits clearly showed a common set of features; this deposit type is characterized by the presence of minerals diagnostic of high-

An Overview of Epithermal Gold Deposits INN

Epithermal deposits are a type of lode deposit. They contain economic concentrations of gold, silver and in some cases base metals such as copper, lead and zinc. Like other lode deposits, the minerals in epithermal deposits can be disseminated throughout the orebody, though more often they are contained in a network of veins.

Characteristics of High Sulphidation Epithermal Gold

Characteristics of large economic high sulphidation epithermal HSE systems of the Mio -Pliocene age mineral belt of Chile and Argentina: . Zoned alteration systems: HSE precious metal systems are associated with large systemically zoned advanced argillic to argillic alteration systems.

Geological Characteristics of Epithermal Precious and Base

Epithermal deposits are important sources of gold and silver that form at <1.5-km depth and <300 C in high-temperature, mainly subaerial hydrothermal systems. Such hydrothermal systems commonly develop in association with calc-alkaline to alkaline magmatism, in volcanic arcs at convergent plate margins, as well as in intra-arc, back-arc, and postcollisional rift settings.

CHARACTERISTICS OF HIGH-SULFIDATION EPITHERMAL DEPOSITS

Neutralization of the acidic solution geochemical environment, whether forming an by reaction with the wallrock results in a sequence epithermal deposit or as part of the alteration of alteration zones, outward from the zoning of an orebody formed at greater depths. hydrothermal conduit, which is indicative of High-sulfidation deposits form in a position decreasing acidity and is defined by the presence intermediate between intrusions and the surface; of alunite, kaolinite, illite, and

Epithermal gold deposits: Styles, characteristics, and

The Utanobori gold deposit is a low‐sulfidation, epithermal vein‐type deposit located in northern Hokkaido, Japan. The deposit is hosted by conglomerate, sandstone, and tuff of the Middle to

EPITHERMAL GOLD DEPOSITS: STYLES, CHARACTERISTICS AND

For example, the characteristic form of these two styles of epithermal deposit is different Table 2 . Most low-sulfidation deposits consist of cavity-filling veins with sharp boundaries, or

epithermal gold deposits: styles, characteristics and

EPITHERMAL GOLD DEPOSITS: STYLES, CHARACTERISTICS AND EXPLORATION Noel C. White1 and Jeffrey W. Hedenquist 2 BHP Minerals International Exploration, 229 Shepherds Bush Road, London W6 7AN, U.K. 2 Mineral Resources Dept., Geological Survey of Japan, 1-1-3 Higashi, Tsukuba 305, Japan 1 Epithermal ore deposits form at shallow depth.

GEOLOGY AND GEOcHEMISTRY OF EPITHERMAL SYSTEMS

Gold telluride deposits with alunite Nolan 1933 and Ferguson 1929 felt that few of these six characteristics were restricted enough to be diagnostic and proposed only two classes of epithermal systems based on the weight ratio of gold to silver, silver-gold, and gold-silver.

An Overview of Epithermal Gold Deposits

Shutterstock photo. Epithermal gold deposits are a type of lode deposit that contain economic concentrations of gold, silver and in some cases base metals including copper , lead and zinc . Gold is the principal commodity of epithermal deposits, and can be found as native gold, or alloyed with silver.

epithermal gold deposits: styles, characteristics and

EPITHERMAL GOLD DEPOSITS: STYLES, CHARACTERISTICS AND EXPLORATION Noel C. White1 and Jeffrey W. Hedenquist 2 BHP Minerals International Exploration, 229 Shepherds Bush Road, London W6 7AN, U.K. 2 Mineral Resources Dept., Geological Survey of Japan, 1-1-3 Higashi, Tsukuba 305, Japan 1 Epithermal ore deposits form at shallow depth.

Epithermal Gold Deposits : their characteristics and modeling

The term ‘Epithermal’ defined by Lindgren 1922, 1933 includes a broad range of precious metals tellurides or selunides , base metals, Hg and Sb deposits, formed by aqueous fluids charged with igneous emanations at low T < 200 C and moderate pressure Now it is considered that predominantly meteoric fluids at slightly

CHARACTERISTICS OF HIGH-SULFIDATION EPITHERMAL DEPOSITS

Neutralization of the acidic solution geochemical environment, whether forming an by reaction with the wallrock results in a sequence epithermal deposit or as part of the alteration of alteration zones, outward from the zoning of an orebody formed at greater depths. hydrothermal conduit, which is indicative of High-sulfidation deposits form in a position decreasing acidity and is defined by the presence intermediate between intrusions and the surface; of alunite, kaolinite, illite, and

Hydrothermal mineral deposit

Characteristics. Epithermal ore deposits form at shallow depth and are typically tabular two-dimensional in geometry. Mining activity

Descriptive models for epithermal gold-silver deposits

This report constitutes a new descriptive model for epithermal gold-silver deposits. It summarizes characteristics of known deposits, including their geological, geophysical, geochemical, and geoenvironmental aspects. Models concerning the genesis of epithermal gold-silver deposits are discussed.

A review of intermediate sulfidation epithermal deposits

Epithermal deposits are responsible for 8% gold Frimmel, 2008 , but also includes a range of characteristics that are typical, but not necessarily exclusive, to one type of deposit. Sulfidation state of sulfide minerals is a function of fs 2 and temperature 1000/T,

Characteristics of some silver-, and base metal-bearing

Silver and base metal-bearing deposits of Mexico and Peru constitute an important portion of the world silver production derived from shallow, vein-type deposits hosted in volcanic rocks. Although these deposits are generally similar to epithermal deposits of Nevada and Colorado in the western United States, they have some important differences.

Characteristics and controls of the largest porphyry

Characteristics and controls of the largest porphyry copper‐gold and epithermal gold deposits in the circum‐Pacific region. Partial melting of the upper parts of stalled lithospheric slabs in the mantle, immediately following collision or arc migration, promotes oxidation of mantle sulfides and the release of gold.

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