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Many workers accept a metamorphic model for orogenic gold ore formation, where a gold-bearing aqueous-carbonic fluid is an inherent product of devolatilization across the greenschist-amphibolite boundary with the majority …
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Based on tectonic background and genetic model, gold deposits can be classified into orogenic-, porphyry-, epithermal-, Carlin-, IOCG- (iron-oxide copper-gold) (IOCG), VMS- (volcanogenic …
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In conjunction with the issues discussed above, recent interest and documentation of Chinese gold deposits, particularly those close to the margins of the North China and Yangtze Blocks, has effectively seen the demise of the crustal metamorphism as a universally viable process for generation of orogenic gold deposits.
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Gold mineralization is hosted in a variety of geological settings, from oceanic arcs to orogenic belts including their forelands and back-arc basins, as well as in alluvial (placer) sediments (Sillitoe 2020; Table 1 and references therein).
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The recent increased applicability of global paleo-reconstructions, coupled with improved geochronology from most of the world's major gold camps, allows for an improved …
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The application of deposit-scale structural targeting to orogenic gold deposits is primarily concerned with locating volumes of higher-grade mineralisation (ore shoots) within a broader, host structural system. Although …
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Concept-based orogenic gold exploration requires a scale-integrated approach using a robust mineral system model. Most genetic hypotheses for orogenic gold deposits that …
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Historic mining of orogenic gold deposits at Macraes, Barewood, Nenthorn, Carrick and Oturehua in the Otago Schist belt was focused on the oxidised surficial zone, <50 m thick, in which supergene enrichment processes had concentrated gold at least ten-fold above primary concentrations of 1–10 ppm. ... Composition and mineralogy of historic ...
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From the base to the top of the mineralising system, the following components and processes are reviewed: (1) the fluid sources; (2) the appropriate ligands and their sources; (3) the solubility of gold and its potential …
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The orogenic clan has been introduced to include vein-type deposits formed during crustal shortening of their host greenstone, BIF or clastic sedimentary rock sequences. Deposits of …
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The Jinchang deposit, Ailaoshan Belt, is a hydrothermal gold-nickel deposit in which nickel mineralization formed during Triassic accretionary orogeny and gold mineralization during Miocene collisional orogeny. Although the nickel and gold orebodies largely overlap in an ophiolite melange at the contacts between ultramafic and metasedimentary sequences, nickel …
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Computer-based stress mapping is a technique that can use the dominant structural control and mid- to late-stage chronology of orogenic gold mineralization in the Birimian gold deposits to predict the location of dilational …
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Miner Deposita Conduit-hosted physical process model for orogenic gold deposits It is proposed here that observations of the physical nature of veins in orogenic gold deposits and their interpretation as seismogenic phenomena can be …
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Historic mining of orogenic gold deposits at Macraes, Barewood, Nenthorn, Carrick and Oturehua in the Otago Schist belt was focused on the oxidised surficial zone, <50 m thick, in which supergene enrichment processes …
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The application of deposit-scale structural targeting to orogenic gold deposits is primarily concerned with locating volumes of higher-grade mineralisation (ore shoots) within a broader, host ...
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Archean greenstone belts host most of the world's high-grade orogenic gold deposits. Among them, the Abitibi subprovince in the southeastern part of the Precambrian Canadian Shield hosts hundreds of gold deposits, distributed over more than 200 km along two major connected reverse shear zones: the Cadillac-Larder Lake Fault Zone (CLLFZ) to the …
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High-grade (> 10 g/t) gold mineralization in orogenic gold deposits is of significant economic importance. Understanding the formation of such enriched ore zones is critical for gold exploration success. The world-class Jundee-Bogada gold camp in the Yilgarn Craton of Western Australia comprises both high-grade (avg. > 10 g/t, Jundee deposit) and low-grade (avg. < 3 …
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The Cuiabá deposit is located in the Quadrilátero Ferrífero metallogenetic province (Fig. 1) and is the largest active underground mine in Brazil, with 20 levels extending to 1.4 km below surface.The 2019 ore reserves amount to 1.31 Moz with a cutoff grade at 6.04 g/t Au with estimated total resources of 5.26 Moz at 7.45 g/t Au (Resources and Reserves Evaluation …
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The Reefton sulfide concentrate was transported 700 km to the Macraes orogenic gold mine (active from 1990) for processing through a pressure oxidation autoclave at 225 °C. The Macraes ore has low Sb contents, so the temporary introduction of a Sb-rich component produced a short-term Sb signal in the autoclave system and tailings waters.
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Deposit-scale structural controls on orogenic gold deposits: an integrated, physical process–based hypothesis and practical targeting implications Jon M. A. Hronsky1,2 Received: 16 February 2019/Accepted: 29 July 2019 ... With the revival of the global gold mining industry in the mid-1980s, there was an increasing motivation among the ...
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The orogenic gold system model advocates a metal and fluid source external to the terrain in which mineralization occurred, but the model applies only for 3 of the 12 deposits studied. All other deposits formed most …
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The West Junggar in Xinjiang, western China, represents a significant gold mineralization belt hosting over 200 gold deposits, with the Hatu gold deposit being the largest among them.
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China has approximately 10,000 t Au reserves and it produces nearly 500 t Au per year. Out of these, ∼75 % of gold comes from the orogenic gold deposits occurring as auriferous veins and disseminations in the host rocks (Goldfarb and Qiu, 2017).Jiapigou is a large district-scale gold deposit in the north-eastern margin of the NCC (Deng and Wang, 2016).
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Orogenic gold deposits are comprised of complex quartz vein arrays that form as a result of fluid flow along transcrustal fault zones in active orogenic belts.
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