The geology of hydrothermal gold deposits in Chile

The geology of hydrothermal gold deposits in Chile

Regional geologic setting of epithermal gold deposits,

Epithermal gold deposits in Chile are Cretaceous to Cenozoic in age. The ores and the volcanic rocks with which they are associated were generated at a noncollisional, ocean-continent convergent

Regional geologic setting of epithermal gold deposits,

Most of the deposits are associated with eroded volcanic centers and subvolcanic porphyries. North-south variations in the nature, extent, and timing of magmatism control the succession of mineralization events.In the Late Cretaceous, vein districts (e.g., El Bronce) and hydrothermal alteration zones were formed in central Chile.

THE GEOLOGY OF THE EL SOLDADO MANTO TYPE Cu

Hydrothermal Iron Oxide Copper-Gold & Related Deposits: A Global Perspective, Manto Type Copper Deposits Chile contains one of the largest copper concentrations on . Geology of the Chile

Great Deposits of the World Geology for Investors

2020-9-11 · Geology. The deposit is concentrated along a series of apophyses ( small intrusions coming off the top of the main intrusion) on the top of a much larger body at depth. Like many of the other major deposits in Chile, it is Tertiary in age, and owes its preservation to its

Gold Mineralization in Volcanogenic Massive Sulfides

"Gold Mineralization in Volcanogenic Massive Sulfides: Implications of Data from Active Hydrothermal Vents on the Modern Sea Floor", The Geology of Gold Deposits: The Perspective in 1988, Reid R. Keays, W. R. H. Ramsay, David I. Groves

Geology and Genesis of the Multistage High-Sulfidation

2018-12-14 · Chile (Fig. 1). With estimated reserves of 17.6 million ounces (Moz) Au and 585 Moz Ag, or 27 Moz Au equiv (Barrick Gold Corporation, Annual Report, 2004), Pascua is the third largest gold-bearing high-sulfidation deposit in the world after Yana-cocha (Peru) and Pueblo Viejo (Dominican Republic). Typical high-sulfidation deposits form

Gold Deposits and Their Geological Classification

2016-11-20 · Geological classification of lode gold deposits is further complicated by the following factors: 1. A significant number of large deposits are the results of superposi-tion of two or more systems, or of superposition of distinct com-ponents of hydrothermal systems due to telescoping (Sillitoe, 1994): this can lead to apparently hybrid deposit

Veins and Hydrothermal Deposits Geology In

2020-9-20 · Vein deposits of this nature are a type of hydrothermal deposit because the mineral species which compose the veins were precipitated by hot waters. However, sometimes the preexisting rock wall which contains the vein undergoes alteration. Portions of the host rock may either dissolve and be transported away or else react chemically with the circulating volatile fluids or the newly formed

Potential for Porphyry Copper Mineralization Below

1 Introduction. Satsuma is the old provincial name of southern Kyushu and is the major gold‐producing area in Japan. The north Satsuma (Hokusatsu) district is characterized by epithermal gold mineralization related to veins, including the major deposits of Hishikari (440 t of total gold, 200 t produced) and other mines that are now closed (with production): Kushikino (56 t), Yamagano (28 t

[PDF] Porphyry-epithermal transition : Maricunga Belt

2020-8-6 · The Refugio, Aldebaran, and La Pepa districts in the Maricunga belt of northern Chile contain advanced argillic alteration zones that locally host high-sulfidation epithermal gold deposits in proximity to porphyry gold (± copper) deposits. The spatial association suggests a genetic link. Mineralized zones are characterized by four main vein types that formed at different times and have

Geology of the Escondida Porphyry Copper Deposit

The Escondida porphyry copper deposit, located in northern Chile, was one of the two largest copper producers of the world in the 1990s. The hydrothermal evolution of this deposit is associated

Geochemical and Isotopic Signature of Pyrite as a Proxy for

2020-9-22 · X-MOL提供的期刊论文更新，Economic Geology——Geochemical and Isotopic Signature of Pyrite as a Proxy for Fluid Source and Evolution in the Candelaria-Punta del Cobre Iron Oxide Copper-Gold District, Chile，I. del Real, J.F.H. Thompson, A. C

Ore Deposit Geology by John Ridley cambridge

Hydrothermal Alteration Mineralogy and Geochemistry of the Archean World-Class Canadian Malartic Disseminated-Stockwork Gold Deposit, Southern Abitibi Greenstone Belt, Quebec, Canada. Economic Geology, Vol. 114, Issue. 6, p. 1057.

Exploration for Giant High Sulfidation Epithermal Gold

2020-3-19 · • 5 50 Moz gold bulk-mineable oxide High Sulfidation Epithermal Gold (HSE-G) deposits are clustered in the Mio-Pliocene Arc of Chile, Argentina and Peru • Giant deposits form in near paleo-surface environment (hundreds of metres from surface) as opposed to HSE covellite chalcosite enagrite(HSE-CC) or epithermal gold enargite(HSE-E)

Geological and Geochemical Characteristics of the

1 Introduction. The north Chilean coastal Cordillera (22°S to 24°S) is a famous province that has many Manto‐type and iron oxide–copper–gold (IOCG) vein‐type copper deposits (Boric et al., 1990; Espinoza et al., 1996; Sillitoe, 2003).Noticeably, within the Cordillera, only the El Morado district has intrusion‐hosted gold‐bearing quartz vein deposits, such as Beatriz and Lilianita.

Great Deposits of the World Geology for Investors

2020-9-11 · Geology. The deposit is concentrated along a series of apophyses ( small intrusions coming off the top of the main intrusion) on the top of a much larger body at depth. Like many of the other major deposits in Chile, it is Tertiary in age, and owes its preservation to its

Gold Deposits and Their Geological Classification

2016-11-20 · Geological classification of lode gold deposits is further complicated by the following factors: 1. A significant number of large deposits are the results of superposi-tion of two or more systems, or of superposition of distinct com-ponents of hydrothermal systems due to telescoping (Sillitoe, 1994): this can lead to apparently hybrid deposit

ore processing of epithermal gold deposits

Epithermal Gold Deposits Part 1! USGS. 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 million ounces of gold from midTertiary, epithermal, silver

ore processing of epithermal gold deposits

Epithermal Gold Deposits Part 1! USGS. 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 million ounces of gold from midTertiary, epithermal, silver

Mineralogy and geochemistry of El Dorado epithermal

The El Dorado Au-Cu deposit is located in an extensive intra-caldera zone of hydrothermal alteration affecting Upper Cretaceous andesites of the Los Elquinos Formationat La Serena (≈ 29°47′S Lat.,...

[PDF] Porphyry Gold Deposits of the Refugio District

2020-9-8 · The porphyry gold deposits of the Refugio district and similar deposits in the Maricunga belt contain the lowest known copper to gold ratios (% Cu/ppm Au = ~0.03) of any porphyry-type deposit. The gold deposits are associated with subvolcanic andesitic to dacitic intrusions emplaced into coeval volcanic rocks. Both the Verde and Pancho deposits are zoned in space from a deeper zone of

Exploration for Giant High Sulfidation Epithermal Gold

2020-3-19 · • 5 50 Moz gold bulk-mineable oxide High Sulfidation Epithermal Gold (HSE-G) deposits are clustered in the Mio-Pliocene Arc of Chile, Argentina and Peru • Giant deposits form in near paleo-surface environment (hundreds of metres from surface) as opposed to HSE covellite chalcosite enagrite(HSE-CC) or epithermal gold enargite(HSE-E)

Gold Deposits eolss.net

2020-8-18 · Gold deposits can still be seen today forming in some active geothermal areas. There are six “world-class” settings for magmatic-hydrothermal gold deposits: 1. orogenic gold deposits 2. Carlin-type gold deposits 3. epithermal deposits 4. porphyry copper-gold deposits 5. iron oxide copper-gold deposits 6. gold-rich massive sulfide deposits.

Epithermal Mining Geology HQ

Epithermal deposits are important sources of gold and silver, representing about 30% of total gold metal production per year. There are two principal styles of epithermal mineralization: low sulphidation (LS) and high sulphidation (HS) epithermal deposits with an intermediate category sometimes recognized.

Distribution and composition of gold in porphyry gold

The Biely Vrch deposit in the Western Carpathians is assigned to the shallow, sulfide-poor porphyry gold deposit type and has an exceptionally low Cu/Au ratio. According to 3-D geochemical models, there is a limited spatial correlation between Au and Cu due to the primary introduction of gold by a salt melt and Cu by low-density vapor. Despite a rough spatial correlation of gold grades with

Porphyry Gold Deposits of the Refugio District, Maricunga

2010-11-11 · Geology of the Maricunga Belt The Maricunga belt is a region of numerous gold-silvercopper prospects and deposits in the high Andes of northern Chile (Vila and Sillitoe, 1991; Fig. 1). Zones of hydrothermally altered rocks give rise to strong color anomalies detectable by satellite imagery and aerial photography (Fig. 2). 27o The color anomalies result mainly from weathering of pyritic

Characteristics of High Sulphidation Epithermal Gold

2019-3-22 · Gold Belt and through Mirasol's Atacama-Puna project generative program in Chile and Argentina. The objective of this presentation is to provide Mirasol's investors with information on geology and exploration signatures of this deposits class, giving context to our exploration program and results.

Models and Exploration Methods for Major Gold Deposit

2015-10-24 · new gold deposits. The objectives of this paper are to provide an update on gold deposit models, and what new approaches and techniques can now be used to find gold deposits. Gold occurs in a wide range of deposit types and settings, but this paper is concerned with deposits in which gold forms the main economic commodity or a co-product.