characteristics of epithermal deposits

Porphyry copper deposit

Characteristics. Characteristics of porphyry copper deposits include: The orebodies are associated with multiple intrusions and dikes of diorite to quartz monzonite composition with porphyritic textures. Breccia zones with angular or locally rounded fragments are commonly associated with the intrusives.

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CHAPTER 2.0 GOLD DEPOSIT CLASSIFICATION 2.1

deposits mentioned in this discussion are vein-hosted gold deposits, which include orogenic, intrusion-related, low-sulphidation epithermal and porphyry gold deposits. Previously, the first two types of deposit were known as mesothermal gold deposit.

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Epithermal Mineralization in Veins

SABKHA DEPOSITS ine beds in northern and central Sinai, the west coast Of Gulf of Suez, and the thick clastic section forming the Gilf Kebir in southwestern Egypt; the upper part of this latter section is of Cretaceous age. Thick vertical sandstone cliffs 310 00' 1000 DRIA AFR PORT SH SAID Older in age NILE DEPOSITS-Cultivated

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eCite

Commonly, lithocaps form as part of porphyry-epithermal systems. They may host high sulfidation epithermal mineralization, and overlie or be adjacent to intermediate-sulfidation epithermal deposits; they can also overlie and partially overprint porphyry deposits, if the systems are telescoped sufficiently.

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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 Syafrizal 1, Tomy Alvin Rivai 2, Kotaro Yonezu 2, Damar Kusumanto 3, Koichiro Watanabe 2 and Arie Naftali Hawu Hede 1,*

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Characteristics of high

Main geological characteristics of 14 selected high-sulfidation epithermal deposits Time Deposit/district, Age Metals, Local volcanic Principal host Genetically between host location (Ma) (tonnes)1 setting rocks related rocks rock deposit Deposit form Motomboto, 1.9 Cu, Au, Ag Central-vent Dae dome, ands/dac/rhy Dioritic, qtz- 1.0 m.y. Hbx, veins, dis in Indonesia 60,000 t Cu. 4 i volcano flows, pyr

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VEIN DEPOSITS

Many epithermal deposits occur in remote regions of under-developed countries, and the construction of infrastructure, such as roads and mills, may be necessary before deposits can be mined. These expenses increase the cost of a mining operation and must be taken into consideration when calculating the economics of a deposit.

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Paper presented at the Terry Leach Symposium, Sydney, 17

epithermal deposits in order to resolve a common discrepancy between published theoretical work and the field observations by experienced exploration geologists. While there is a focus upon low sulphidation epithermal Au-Ag deposits, mixing is also recognised in association with elevated Au in high sulphidation systems (Pierina;

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EPITHERMAL AU

The term epithermal is therefore herein only included in the names of deposits formed at shallow crustal levels (epithermal quartz Au-Ag and epithermal banded chalcedony-ginguro Au-Ag), and not the quartz-sulphide Au + Cu and carbonate-base metal Au – polymetallic Ag-Ag styles.

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Porphyry

Geology of the Maricunga Belt. The Maricunga belt, located in northern Chile about 700 km north of Santiago (Figs. 1, 2), is a metallogenic province of Miocene age that contains numerous gold, silver, and cop- per deposits of porphyry and epithermal character (Vila and Sillitoe, 1991).

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Paleosurface characteristics of the epithermal deposit: A

mainly formed at the top of epithermal metallogenic system. There are two types of the mineralization in Sinongduo Ag polymetallic low-sulfidation epithermal deposit named the hydrothermal explosion breccia type and the vein type. According to the geological tectonism characteristics and the ore occurrence, it's the extensional fault

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Chapter 7 Exploration for Epithermal Gold Deposits

Lindgren (1922)first defined the epithermal environment as being shallow in depth, typi- cally hosting deposits of Au, Ag, and base metals (Table 1). Epithermal systems have also been exploited for a wide range of metals and minerals, including Hg, Sb, S, kaolinite, alunite, and silica.

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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 Syafrizal 1, Tomy Alvin Rivai 2, Kotaro Yonezu 2, Damar Kusumanto 3,

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Classification of Quartz Textures in Epithermal Veins

Classification of Quartz Textures in Epithermal Veins. A classification of quartz textures in epithermal veins is developed from a review of the available descriptive literature and observation of approximately 400 specimens and 150 thin sections from more than 20 epithermal deposits and prospects. Thirteen quartz textures are defined (Fig.

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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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An Overview of Epithermal Gold Deposits

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.

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VEIN DEPOSITS

Epithermal Type Characteristics Epithermal - comparatively low temperatures (50-200deg;C). The three types grade into one another. deposited normally within 1,000 m (3,000 ft.) of surface; average 350 metres. form as vein fillings, irregular branching fissures, stockworks or breccia pipes.

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Characteristics of Mineral Deposits

GEOLOGY – Vol. IV – Characteristics of Mineral Deposits - Maria Boni Encyclopedia of Life Support Systems (EOLSS) and seams in the rocks. Then he must be thoroughly familiar with the many and varied species of earths, juices, gems, stones, marbles, rocks, metals and compounds. GEOLOGY – Vol.

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Epithermal Gold for Explorationists

and epithermal gold deposits, particularly in low sulphidation systems. The term epithermal is therefore used in field exploration studies to describe Au Ag Cu deposits formed in magmatic arc environments (including rifts) at elevated crustal settings, most typically

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1 INTRODUCTION

epithermal and porphyry deposit types considered in detail (figure 1.1) and also provide a brief overview of the geological settings in which these deposits form. 1.1 SETTING OF EPITHERMAL-PORPHYRY ORE DEPOSITS Epithermal and porphyry ore deposits develop in response to plate tectonic processes, typically as

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CHARACTERISTICS OF HIGH

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-

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trace elements associated with gold deposits

Geochemistry of hydrothermal gold deposits: A review . With increasing new data, studies on the geochemistry of gold deposits can be used to trace the origin of oreforming fluids, the source of gold, and the transporting form of Au and other oreforming elements, such as Si, S, F, Cl, As and Ag. Get price

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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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Characteristics of the Cibaliung gold deposit: Miocene low

Characteristics of the Cibaliung gold deposit Miocene low-sulfidation-type epithermal gold deposit in Western Java, Indonesia. Agung Harijoko, Yukiko Ohbuchi, Yoshinobu Motomura, Akira Imai, Koichiro Watanabe. Earth Science and Technology; Research output: Contribution to journal › Article.

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Challenges in maximising the value from epithermal gold

The characteristics of epithermal gold deposits include being highly variable with respect to geometry and gold grade distribution, the presence of other economic contributors, mineralogy, texture, rock strength, weathering and alteration overprint. These characteristics influence the economic value of mining projects in an interlinked manner.

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Geological Characteristics of Epithermal Precious and Base

Epithermal deposits are important sources of gold and silver that form at 1.5-km depth and 300C 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.

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Epithermal Gold Deposits

Epithermal Gold Deposits In The Making. These minerals form layers alternating with layers of native gold or electrum (a mixture of gold and silver). This layering is called colloform-crustiform banding and is often associated with high grade ore, including the highly prized bonanza grade.

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4 BRECCIAS

appearance of the breccia using characteristics set out by McPhee et al. (1993) for volcanic breccias and applied by Davies et al. (2000) to porphyry and epithermal deposits. • Colloquial breccia terminology as terms developed through common use (Corbett, short courses; Taylor, 2009).

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Geology and mineralization in the Suyoc epithermal deposit

However, the district also hosts other deposits that have yet to be investigated in detail, such as the Suyoc epithermal deposit located south of the Lepanto deposit. This study presents detailed characteristics of the geology and mineralization characteristics of the epithermal mineralization in Suyoc from field data, ore mineralogy, fluid

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Characteristics of a Low

Wajdi et al. have documented that quartz-carbonate veins cutting through host rocks in RRZ exhibit several textures that are characteristic of low-sulfidation epithermal deposits. These textures include colloform-crustiform banding, bladed calcite, massive chalcedony, and comb banded quartz.

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