Gold deposits are formed by a wide range of geological processes, and according to the US Geological Survey, they generally fall into two categories: lode deposits and placer deposits....
The Xiejiagou gold deposit located in the Zhaoyuan-Laizhou gold belt is composed of altered-rock-type gold mineralization and superposed auriferous quartz veins, showing unique two-stage gold ...
Carlin-type gold deposits contain "invisible" or microscopic particles of gold that are deposited within a mineral called pyrite in sedimentary rocks. Needless to say, these deposits are named ...
Here, the gold is further concentrated by the action of water. Because gold is heavier than most of the material moved by a creek or river, it can become concentrated in hollows and trapped in the bed of the river. …
Gold is either the only economically important metal or a major by-product in 11 well-characterized deposit types—paleoplacer, orogenic, porphyry, epithermal, Carlin, …
Lode gold deposits are among the most economically important types of gold deposits in the world. Globally, they formed mainly in three time intervals, 2.8 to 2.5 Ga, 2.1 to 1.8 Ga, and 700 Ma to the present. Sources of ore-forming fluids and other components are of critical importance in a better understanding of the genesis and the geodynamic controls of …
The Triassic gold deposits of the Youjiang Basin, southern China, have been variously correlated to Carlin-style and orogenic gold deposits or classified as a new intermediate deposit type.
well as the Witwatersrand-type gold deposits, which are more than adequately reviewed in recent literature (Frimmel et al., 2005; Law and Phillips, 2005). Exploration is mainly preoccupied with defining the footprints of known gold deposits and with integrating various techniques with geology for their efficient identification and detection.
The Nalunaq gold shown in Figure 9.16 is an example of hydrothermal gold. Two other examples of hydrothermal mineralization are below in Figures 9.81 and 9.82: molybdenite ore from the Keystone Mine in Colorado …
In situ sulfur isotope analysis of pyrite and arsenopyrite in Carlin-type deposits.. Study has focused on relationships between different deposits in the Youjiang Basin. • There are two source end-members from NW to SE basin, δ 34 S ~ +0‰ and δ 34 S > +10‰. Results lead to a differential deep metamorphic–hydrothermal genetic model.
Such deposits are thus the largest, single genetic type of deposit for providing gold. Nevertheless, as a genetic class, their formation remains a matter of debate (Tomkins Citation 2013a). The main reason for this debate lies in their depth of formation in the crust, which is interpreted to be >4 km (Goldfarb et al. Citation 2005 – Figure 1).
Determining the mineralization ages of the Carlin-type gold deposits is integral to elucidate their links to associated geological events and to develop a suitable genetic model for these important deposits (Chakurian et …
The Triassic gold deposits of the Youjiang Basin, southern China, have been variously correlated to Carlin-style and orogenic gold deposits or classified as a new intermediate deposit type. However, in terms of a multi-scale mineral system approach, they show remarkable similarities to the Tertiary Carlin-type deposits of Nevada and distinct …
Carlin-type gold deposits John L. Muntean 1 *, Jean S. Cline 2, Adam C. Simon 2 and Anthony A. Longo 2 The Eocene epoch in the Great Basin of western North America was a period of profuse ...
Gold/Auriferous Deposits can be classified into types for which here is a List of 10 Types of Gold Deposits: Auriferous porphyry dykes, sills, and stocks; Auriferous pegmatites; coarse-grained granitic deposits + albitite.
Carlin-type deposits are typically mined using open-pit mining methods and complex extraction techniques, such as heap leaching and carbon-in-pulp (CIP) processing. Epithermal Deposits: Epithermal deposits are another type of gold occurrence that is typically found in volcanic regions. These deposits are formed when hot, mineral-rich fluids are ...
1. Introduction. The Nanpanjiang basin, located in southwestern China, is the second-largest concentration of Carlin-type gold deposit (CTD) in the world (Hu et al., 2002, Su et al., 2018).The basin hosts>200 gold deposits or occurrences with total proven gold reserves of ca. 800 t at an average grade of 4.5 g/t (Pi et al., 2017, Su et al., 2018). ...
esis of Carlin-type Au deposits results from the fact that within some of the districts and trends and at other locations in Nevada, there are sedimentary rock-hosted disseminated Au deposits that have some attributes in common with, and other features that are distinct from, Carlin-type deposits (e.g., Hofstra and Cline, 2000; Hofstra, 2002).
The metallogenetic scenario for Jiaodong type gold deposits is referred as "thermal doming-extension metallogenesis". Abstract. Based on the new deep exploration results, the gold reserves of Jiaojia gold deposit and Sanshandao gold deposit of the Jiaodong gold province, eastern North China Craton (NCC), exceed 1300 and 1200 tons ...
The Jiaodong gold deposits are different from orogenic and intrusion-related gold deposits in terms of the tectonic background, types of host rocks, and ore-forming mechanism. These gold deposits show close spatial-temporal and genetic relationships to mafic igneous rocks, implying the derivation of ore-forming fluids from the metasomatic ...
The amount of gold in any type of deposit is calculated based on the ore's grade (the amount of gold per tonne of rock) and tonnage (total number of tonnes) available at that grade. The higher the grade of the material, the lower the tonnage required to make recovery economical. A high-grade deposit could have gold values ranging from 10 to ...
Fluid inclusion and isotopic data on quartz, carbonate, and clay minerals from Carlin-type deposits in two gold grovinces of southwest China suggest the deposits formed at epizonal levels where metamorphic fluids discharged into foreland fold and thrust belts, reacted with sedimentary rocks, and mixed with local meteoric ground waters.
The major types of gold deposits in Australia Porphyry. Formed when a column of rising magma cools and differentiates over multiple stages, Porphyry mineral deposits consist of a combination of ...
It is a quartz vein-type gold deposit in the southern end of the Qixia-Penglai ore belt. In order to explore the source and properties of ore-forming fluids and materials in the Panzijian gold deposit, explore the ore-forming process and reveal the genesis of the deposit, this work has carried out petrographic observation and temperature ...
Sixteen common types of bedrock gold deposits are distinguished from one another and their main geological attributes are summarized. Many of these deposit types represent different components of larger hydrothermal systems active at the same crustal levels and are genetically related. The geochemical parameters for most of deposit types are the
Three new grade and tonnage models for sediment-hosted gold deposits are presented in this paper: (1) a general sediment-hosted gold type model, (2) a Carlin subtype …
The characteristics of mineralizing fluids in sediment-hosted gold deposits of Carlin and orogenic types are similar. They are low salinity fluids, relatively reduced, with a near neutral pH, a ...
The Garrcon gold deposit (20.6 million tonnes of ore containing 636,000 oz Au 31) is located in the Garrison camp near the provincial border between Ontario and Quebec within a transtensional ...
The Carlin-type gold deposits in Nevada make up one of the largest gold districts in the world (Cline et al., 2005).These deposits contain an endowment of ~255 Moz (7,931 tonnes) of gold, of which 89% occurs in four main clusters of deposits, including the Carlin trend, Getchell, Cortez, and Jerritt Canyon (Muntean, 2018).The deposits occur along north …
