Structural and lithological study of gold mineralization. Magnetic felsic intrusions associated with canadian archean. Structurally controlled gold mineralization in the menzies. Structurally hosted, mesothermal, lode gold deposits in metamorphic terranes constitute a single, coherent group of epigenetic precious met al deposits. Registration on or use of this site constitutes acceptance of our terms of service and privacy policy. Registration on or use of this site constitutes acceptance of our terms of servic. Extension and gold mineralization in the archean kalgoorlie terrane, yilgarn craton roberto f. Structural control of auriferous mineralization in the. These faults channel mineralising fluids from deeper crustal levels to traps in an episodic manner through seismic pumping 11,12. Geological features indicative of archean lode gold potential were extracted from the geoexploration datasets for use as inputs in the predictive model, based on the conceptual model for archean lode gold deposits.
Exchangetraded funds have popularized investing in gold miners and made that asset class more accessible to a broad swath of investors. Gold prospectors use tools such as gold pans, sluice boxes, drywashers or highbankers to find gold. Department of applied geology, indian school of mines, dhanbad 826 004, jharkhand, india. Related to gold mineralization in an archean alkalic intrusive setting c. Despite intensive efforts, determination of a predictable pattern of gold distribution to enhance process understanding and simplify exploration has remained elusive.
In principal, the magnetic responses of mineralised zones depend on the fact that magnetite is either created or destroyed in hydrothermal alteration associated with gold mineralization gunn and dentith, 1997. Kambalda area of the archaean yilgarn craton occurs in a wide variety of host rocks and structural settings. The evidence shows a distinct tectonic setting for the gold mineralization involving the generation of the particular magmas. The potential for gold production in minnesotas portions of the wawa and wabigoon subprovinces is excellent, and the exploration models used for nearby gold. The proposed occurrence model for gold mineralization and the available data suggest that two broad regions of greenstone in the archean superior province in northcentral. Cratoniazation, late archean igneous rocks, mineralization. The structural controls on gold mineralization at kukuluma and matandani conform with models for archaean gold mineralization more broadly, as summarized by 8,9, in the sense that mineralization is latetectonic, appears to occur as a single event during a shift in the far field stress, precedes cratonic stabilization, and is associated with. Deformation and gold mineralisation of the archaean pilbara. Structural controls on gold mineralization on the margin. Pdf first report of organic matter associated with.
Because gold mineralization occurs late in most granitegreenstone terrains 2,6,9,18, irrespective of what underlying tectonic model is applied, gold trapping structures can be highly diverse in geometry, and will be controlled by the interplay of multiple overprinting deformational and intrusive. Two styles of gold mineralization are present within the carosue dam area. Disclaimer commerce policy made in nyc stock quotes by fi. The most common gangue minerals in these veins are quartz and carbonate, with lesser amounts of chlorite. The chief sulfide mineral is pyrite with much lesser amounts of chalcopyrite, arsenopyrite, and pyrrhotite. Witwatersrand basin, south africa barberton greenstone belt, south africa. Introduction 48 archean deposits are a major source for gold across most cratonic regions in the world 14. The shear zones and ore bodies reflect the geometry of the host gneisses. Structural controls on gold mineralization on the margin of.
Structural controls on gold mineralization on the margin of the yilgarn craton, albany. All you need are a few simple tools and your own powers of careful observation. The fluids that transport the gold are typically aqueouscarbonic fluids. These events bracket the duration of the crustal shortening event known as the kalgoorlie orogen. Pdf what controls gold distribution in archean terranes.
Deformation and gold mineralisation of the archaean. February 2020 deformation zone strike length km width. In addition, many of these igneous rocks are associated with pge and gold mineralization. Evaluation of weights of evidence to predict gold occurrences. Nov 14, 2014 sedimenthosted gold mineralization of archean age is found in the wyoming province and is geologically and geochemically more similar to the phanerozoic turbiditehosted or mesothermal type of gold deposit than to the more typically archean greenstonehosted type. Archean orogenic gold deposits show many common features, including a common association with major fault systems that cut volcanosedimentary sequences in greenstone belts e. What controls gold distribution in archean terranes. Minerals free fulltext archaean gold mineralization. Cabri mineral sciences laboratories, canmet, 555 booth street, ottawa, ontario kia 0gi. Jul 01, 2018 they may be pre gold, relatively rare syn gold e.
You may be willing to part with your unwanted or old gold jewelry to add some cash to your wallet. Manuscript approved for publication august 5, 1991. It helps to know how much gold may be worth and where to sell it for the best price. Co 2 rich fluids can unmix into two phases at relatively high temperatures and pressures. Abstract this paper focuses on two extensional events affecting late archean crust of the kalgoorlie terrane in the eastern goldfields, and which are associated with gold mineralization. Pdf indicator carbonaceous phyllitegraphitic schist in. Damaged goods deformation fabrics in a goldbearing. Implications for gold mineralization visavis organic matter p r sahoo and a s venkatesh. The magnetic association is complex and the gold mineralization could be with or without magnetic signatures. This is a pdf file of an unedited manuscript that has been accepted for publication. The system is open to the west and to the south at depth. Twenty km to the east of the kenty area, the rundle deposit shows a very different style of gold mineralization. Pdf first report of organic matter associated with archean. Locally, galena and sphalerite are the dominant sulfide vein minerals.
In particular, sb and li haloes were found to exceed over 500m width, as a result of which the current study did not get out of the hydrothermal system. The further comprehensive interpretation concern a process separating freshlypanned gold concentrate from residual mineral inclusions. The early extension phase is preserved around the raeside batholith and gave rise to the earliest recognized. Particular emphasis will be placed on the types of deformation, geometric features controlling gold mineralizationand their implicatio n for mineral exploration in west africa. A limited number of gold assays were completed, some. Comparison of alteration, quartz veining and sulphide mineralization from the con mine a left side and gold terra drill holes within the campbell shear stratigraphy b right side. Pdf archean gold mineralization in an intrusionrelated. This thesis work is devoted to study of orogenic gold deposits of archean greenstone belts in both russian and finnish parts of the fennoscandian shield. Geological survey of canada, ottawa, ontario, canada kia oe8 and.
I am interested in late archean igneous rocks that were emplaced during the final stage of the cratonization of the canadian shield. Pdf using aiip results of tdem data to identify potential au mineralization in resistive terrains, i. The exceptions are obsidian which is made of volcanic glass and. Gold was precipitated in the archean at greenschist facies within granulite gneiss hosts. Learning the basics of mineral identification is easy. These four gold miners are ready to break higher realmoney. Many mesothermal gold deposits in the quadrilatero ferrifero qf region of minas gerais, brazil are encompassed in the subamphibolite to greenschist facies group of archean, greenstone belt deposits. Archean orogenic lode gold deposits are the result of large, complex mineralizing systems that have developed within many archean terrains. Data driven predictive modelling for archean lode gold. Other examples include diamonds, gold, silver, copper, rubies, turquoise, top some common examples of minerals include quartz, graphite, talc and amethyst.
Archean geology of the northern block of the ishpeming. The pattern of gold distribution along the archean boulderlefroy shear zone in the yilgarn craton of western australia provides insights into gold distribution in one of the worlds richest provinces. Predictive mineral discovery the main goal of the research was to develop a comprehensive mineral systems understanding for gold in the eastern yilgarn craton, and to use this knowledge for predictive mineral discovery. Archaean lode gold mineralisation in banded iron formation. Igneous, sedimentary and metamorphic rocks are found everywhere on the ear roughly 3,700 minerals are found in the earths crust, according to. Co 2rich fluids can unmix into two phases at relatively high temperatures and pressures. Targeting gold deposits along a regional shear zone. Pdf understanding archean greenstonehosted lode gold. Some common examples of minerals include quartz, graphite, talc and amethyst. They appear to have a systematic sequence of events in common, including syncollisional peak metamorphism and development of ductile fabrics and gold mineralization during postpeak metamorphic brittleductile reactivation of ear. Leadisotope data suggest that epigenetic gold deposits formed at 3410 ma d 2, 3200 ma d3, 2990 ma d4, and 2900 ma d7, and structural relations suggest further events at archean lode gold is a very important part of global gold resources and the 3. Thermochemical conditions for the formation of archean lode. A regional structural model for gold mineralization in the. Modern prospectors may use metal detectors to help loca gold prospectors use tools such as gold pans, sluice boxes, drywashers or highbanker.
Study of archean gold mineralization and associated igneous rocks. Pdf extension and gold mineralization in the archean. Archaean lode gold mineralisation in banded iron formation at. Archean gold mineralization and oxidized hydrothermal fluids. Minerals free fulltext archaean gold mineralization in. Altogether, more than 60% of earths crust formed during this time period, making archean terranes worldwide particularly rich in mineral resources. Even among other archean terranes, the superior province is exceptionally rich in gold.
Mineralizing systems are defined to include all geologic factors that control the generation and preservation of mineral deposits and emphasize the processes responsible for deposit formation at a variety of scales. Recurring themes are the structural controls on mineralization, particularly shear zones and anticlines, and the complexity of the overall geometry of highly gold mineralized domains groves et al. These archean intrusions are comparable with phanerozoic magnetiteseries plutons accompanying metallic mineralization and magnetite rich intrusions hosting aurich porphyry deposits. The archean superior province greenstone belts that host many of canadas richest gold camps continue along strike across the u.
Its an excellent hedge against inflation because its price usually rises when the cost of living increases. Going for the gold with a new gold miners etf benzinga. Archean lode gold is a very important part of global gold resources and the 3. Archean gold mineralization at the kenty and rundle. Structural and lithological study of gold mineralization in.
Superior province rocks originated in the archean eon, between 4. Therefore, our studies are pertinent to understanding the geological settings for the mineralization. Approximately 335,000 oz of gold have been produced from the atlantic citysouth pass district from quartz veins in shear zones. Magnetic felsic intrusions associated with canadian. Such diversity requires that canadian archaean worldclass gold deposits be of multiple geological and. Archean gold mineral systems in the 0xufklvrqrpdlq eastern. The stratabound ore body is hosted primarily by bif, which consists of. Yamana gold auy yamana looks bottomy in the longterm. Archean gold mineralization in an intrusionrelated, geochemically zoned districtscale alteration system in the carosue basin, western australia march 2008 economic geology 1032. Gold is a great investment because it maintains its value in the long term. The archean deposits share most geologic characteristics with proterozoic and phanerozoic lowsulfide au quartz veins as described by berger, 1986b model. Rogers 112 structural controls on mesothermal gold mineralization. Conclusions this paper improves structural and lithological study of gold mineralization in the areas of bena and bakolobi. Lode gold deposits are one of the most characteristic features of archaean greenstone belts within.
Archean gold mineralization and oxidized hydrothermal. Base metal and silver mineralization occurred in quartzcarbonate veins hosted by brecciated fault zones. Latearchean granitoidhosted lodegold deposits, yilgarn. This is the newssite for the company iminerals on markets insider 2020 insider inc. Extension and gold mineralization in the archean kalgoorlie. Importantly, w was identified as a proximal indicator mineral, producing restricted haloes around gold mineralization. Canadian malartic is a largetonnage, lowgrade archean gold system, consisting of a widespread shell of disseminated gold bearing pyrite mineralization hosted by porphyritic felsic to intermediate intrusions and altered metasediments. Gold has been mainly exploited from clastic sedimentary units, shear zones orogenic gold deposits, goldrich polymetallic volcanogenic. Implications for gold mineralisation gold mineralisation was episodic in the pilbara, in concert with magmatism and deformational events fig. Pdf the carosue basin, in the eastern goldfields of the archean yilgarn craton. Centre for strategic mineral deposits formerly key centre, department of geology and geophysics, the uni. Geological context the agbahou gold deposit is located at about 230 km at the nw of abidjan cote.
Indicator carbonaceous phyllitegraphitic schist in the archean kundarkocha gold deposit, singhbhum orogenic belt, eastern india. Multiphase mineralization in concordant and discordant gold veins, dome mine, south porcupine, ontario, canada david c. Of gold mineralization in two archean settings of high metamorphic grade in australia peterneumayr key centre for strategic mineral deposits, departmznt of geology, the university of western australin nedlnnls. Exploration targeting and geological context of gold. Tropicana is a world class gold deposit on the margin of the yilgarn craton gold was precipitated in the archean at greenschist facies within granulite gneiss hosts mineralization was governed by fluid flow in a network of shear zones the shear zones and ore bodies reflect the geometry of the host gneisses. Archean gold mineral systems in the 0xufklvrqrpdlq. The canadian malartic mine, southern abitibi belt, quebec. Magnetic signatures related to orogenic gold mineralization.
The entire history of five deformation events has affected gold mineralization. Archean gold mineralization at the kenty and rundle deposits, swayze greenstone belt ecg hastie1, 2, b lafrance1, and dj kontak1 1mineral exploration research centre, department of earth sciences, goodman school of mines, laurentian university, sudbury, ontario p3e 2c6. In 1987 and 1988, several surveys were conducted which measured electric. Though the origin of carbon, whether organic or inorganic. The proposed occurrence model for gold mineralization and the available data suggest that two broad regions of greenstone in the archean.
Fluid inclusion data support the formation of major archean au vein deposits at deeper crustal levels than more recent magmatichydrothermal mineralization, such as porphyry cu deposits. Mineralization was governed by fluid flow in a network of shear zones. Archean gold mineralization at the kenty and rundle deposits. Roughly 3,700 minerals are found in the earths crust, according to. Archaean gold mineralization in an extensional setting. Leadisotope data suggest that epigenetic gold deposits formed at 3410 ma d 2, 3200 ma d3, 2990 ma d4, and 2900 ma d7, and structural relations suggest further events at gold at the former bousquet and bousquet 2 gold mines from 1993 to 2002 and as senior exploration geologist for agnico eagle mines ltd. Lithological and structural controls on gold mineralization. However, significant organic componentsorganic activity associated with gold mineralization have been reported from archean black shalescarbonaceous rocks western lachlan orogen, victoria, southeast australia.
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