Diagram showing relationships between intrusive events and mineralization, jamestown subdistrict 146 122. Mesothermal gold mineralization of galat sufar south nubian. The deposits are composed of gold bearing but relatively sulfidepoor massive quartz veins which occupy shear zones in graphitebearing paragneiss of precambrian age. Although proterozoic gold deposits have a variety of geologic characteristics that make each deposit unique, they also have many features in common. Metallogenic problems of hydrothermal gold deposit. Pdf geochemistry and genesis of mesothermal gold deposits in. The deposits are hosted in archaean volcanoclastic sediment and intrusive diorite. Jurassic 166 2 ma gold vein deposits of the samhwanghak mine, youngdong area, are examples of mesothermal gold deposits in the republic of korea. The geological evolution of the deposits involved three separate stages. The cuau deposits in the flatschach area show similarities with meso to epizonal orogenic lode gold deposits regarding the geological setting, the structural control of mineralization.
Diagram showing timing of gold telluride deposits in some representative districts in relation to tertiary tectonic style and other mineral deposits in colorado 145 121. Mesothermal gold mineralization of galat sufar south. The specific geological and geochemical data that was compiled for use in the subsequent gis prospectivity analysis are summarised in table 2. What controls gold distribution in archean terranes. A nationalscale gis and prospectivity models of mesothermal.
This district has produced 745 kg of au from 25 kt of ore, with an average grade of 29. Mesothermal gold deposits form half way up through the rise of the melt from the deep crust to the surface usually at a depth of less than 10 km but greater than 1 km. Telescoped low sulphidation mineralization with pyrite, base metal sulph ides. Mesothermal gold mineralization in a proterozoic greenstone. The use of the models can be extended to other gold deposits found in different geological environments. Gold mineralization in asrich mesothermal gold ores of. The orogenic or the socalled mesothermal gold deposits are a distinctive type of deposits that reveal temporal and spatial association with orogeny, where the system of gold veins deposits and related mineralization forms during compressional to transgressional deformation processes.
Well they usually comprise one or more steeply dipping quartz or carbonate rich veins, as you can see in the pictures these sometimes forms veins or even stock works of narrow vein. These proterozoic gold occurrences are similar to archean mesothermal gold deposits in terms of geologic, structural, and tectonic setting, alteration and vein. Mesothermal gold vein mineralization of the seolhwa mine. Awak mas is a mesothermal, sedimentary hosted gold deposit in luwu, south sulawesi, estern part of indonesia with an approximate a measured resources of 2. These four gold miners are ready to break higher realmoney. Gold mineralization in the sops arm group is epigenetic and is associated with mesothermal style quartz and quartzcar bonate veins that typically also contain basemetal sulphides such as pyrite, chalcopyrite, galena and sphalerite. Mesothermal gold vein mineralization of the samdong mine. Other thorough contributions are vieira 1988,199la and vieira and simoes 1992. Mesothermal and greenstone gold deposits aka orogenic. Garba, origin of panafrican mesothermal gold mineralization at bin yauri, nigeria, journal of african earth sciences 31 2000 433449. However, the term mesothermal is not used here in order to avoid confusion with slate belt or lode deposits to which it is generally applied.
Minerals free fulltext archaean gold mineralization. It helps to know how much gold may be worth and where to sell it for the best price. Geological survey, box 25046, ms 964, denver federal center, denver, co 802250046, usa b state key laboratory of geological processes and mineral resources, school of earth sciences and resources, china university of geosciences, beijing 83, china. Archaean lode gold mineralizations represent a coherent class of gold deposit called orogenic gold deposit that developed over a crustal depth range from granulite to sub.
Monarchs tenement package covers the approximately 100km strike length of the ida fault, which separates the eastern goldfields and southern cross provinces of the yilgarn. The significance of linear trends and clusters of faultrelated mesothermal lode gold mineralization s. The bottom photo shows the typical illite alteration of. Fluidrock interactions and lode gold mineralization the warrawoona syncline is one of the largest ma. 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. Gold is a great investment because it maintains its value in the long term. Orogenictype coppergoldarsenicbismuth mineralization at. Wallrock petrology and geochemistry in alteration halos. Geochemistry, alteration, and genesis of gold mineralization. Gold is associated with pyrite in illitic altered host rocks with variable quantities of specularite, chalcopyrite, and ankerite. Lowsulfide quartz gold model usgs publications repository.
Mineral resource assessment 16 descriptive model for vein and replacement deposits of gold, silver, copper, lead, zinc, tungsten, and manganese 17 geology 17 geochemistry 18 ages of mineralization 18 geophysicsremote sensing 19 genesis 19 recognition criteria 19 gis submodels 19 hostrock submodel 20 iii. The cuau deposits in the flatschach area show similarities with meso to epizonal orogenic lode gold deposits regarding the geological setting, the structural control of mineralization, the type of alteration, the. On wednesday, the vaneck vectors gold miners etf nysearca. Gold solubility under such conditions is described by. A recent model proposed for the formation of the victorian deposits suggests that the gold is sourced from the surrounding turbidites large et. Pdf geochemical characteristics of mesothermal gold deposits in. Roughly 3,700 minerals are found in the earths crust, according to. Mineral resource assessment 16 descriptive model for vein and replacement deposits of gold, silver, copper, lead, zinc, tungsten, and manganese 17 geology 17 geochemistry 18 ages of mineralization 18 geophysicsremote sensing 19 genesis 19 recognition criteria. Lode gold mineralization in the paleoproterozoic birimian. A nationalscale gis and prospectivity models of mesothermal gold mineralisation in new zealand ga partington1 and r smillie2 1 institute of geological and nuclear sciences, po box 30368, lower hutt, new zealand. Therefore, discoveries of economic mesothermal gold deposits are still open in the metamorphic terrains, and thus, it requires a systematic exploration based on. Registration on or use of this site constitutes acceptance of our terms of servic. Chapter 2 proterozoic lode gold and ironcoppergold. Zoned alteration haloes are a feature of lode and vein gold deposits.
Drilling within awak mas including its satellite prospects, now totals 1,012 holes with an aggregate meterage of 118,081. Metallogenic problems of hydrothermal gold deposit formation. Differing styles of mesothermal gold mineralization are fundamentally controlled by the localized. This aerial photo shows the former mine site where almost 5,000 ounces of gold was extracted by a heap leach operation during the late 80s.
The dominant fluids associated with gold mineralization were h 2 oco 2nacl 0. Gold prospectors use tools such as gold pans, sluice boxes, drywashers or highbankers to find gold. Pdf the significance of linear trends and clusters of. Three n s striking ductile shear zones, with different intensity of shearing and hydrothermal alteration, cut the mafic rocks. The last case underscores the significance of the magmatichydrothermal transition in the formation of mesothermal gold deposits brues mine. Red circles represent open areas around the mineralization and blue circles represent untested fault intersections. Paper from exploration and mining geology, volume 20. Mineralization of greenstone and mesothermal deposits. Probabilistic targeting for mesothermal gold mineralisation. Three major gold deposits, matandani, kukuluma, and area 3, host several million ouncez moz of gold, along a 5 km long, wnw trend in the e part of the geita greenstone belt, nw tanzania. Geochronology and structural relationships of mesothermal gold mineralization in the palaeoproterozoic jokisivu prospect, southern finland volume 147 issue 4 k.
Summary1 mesothermal gold mineralization of the seolhwa mine were deposited in a single stage of massive quartz veins, which filled the mainly northeasttrending fault shear zones exclusively in the granitoid within the gyeonggi massif. Greenschist facies carbonaceous and carbonatebearing turbidites and greywackes, and mafic dikes host numerous economic mesothermal gold deposits. Mesothermal and epithermal gold mineralization in tagaung myitkyina belt at mabein, shwegu and bamoh area. Considering the combined temporal and spatial association of gold mineralization with highly deformed zones, and age data from the mineralization system and hostrocks, we conclude that gold mineralization in the afema gold district is synkinematic, postmetamorphic and belongs to the family of orogenic gold deposits. Pdf the significance of linear trends and clusters of fault. Igneous, sedimentary and metamorphic rocks are found everywhere on the ear roughly 3,700 minerals are found in the earths crust, according to. Any discussion of proterozoic gold mineralization would be incomplete without considering the spatial relationship between granites and gold e.
Pdf mesothermal gold vein mineralization of the seolhwa. The area filled with thin lines represents the pt regime related to the thrust of the barrocas dome over the fb mine during mineralization, b pt regimes for the fmp, mr, and fc. The awak mas deposit, located in the southern section of the central sulawesi metamorphic belt, is. You may be willing to part with your unwanted or old gold jewelry to add some cash to your wallet. Vein quartz was deposited mostly prior to deposition of sulfides and gold, and contains three main types of fluid inclusions. This is the newssite for the company iminerals on markets insider 2020 insider inc.
Nov 20, 2009 mesothermal gold mineralization of the seolhwa mine were deposited in a single stage of massive quartz veins, which filled the mainly north. Ore mineralization, alteration and mineralizing hydrothermal fluid charateristics of the awak mas mesothermal gold deposit, south sulawesi, indonesia arifudin idrus, safruddim, anastasia dewi titisari department of geological engineering, gadjah mada university jl. Other examples include diamonds, gold, silver, copper, rubies, turquoise, top some common examples of minerals include quartz, graphite, talc and amethyst. Mineral assemblages in the haloes vary systematically with hostrock metamorphic grade.
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. Leapfrog gold model of gold mineralization with controlling and feeder structures. Gold mineralization is widespread across block 14, with in excess of 5,000 artisanal miners working and is considered to be a latestage, postsuture event that is dominated by shear zones. Mineralization is regularly distributed in the vein often forming steeply plunging high grade. Mesothermal lode gold deposit central belt peninsular malaysia. Garba, the variety and possible origin of the nigerian gold mineralization. The term mesothermal veins is really a sack term, referring simply to the depth formation. Gold mineralization in asrich mesothermal gold ores of the. Gold mineralization in asrich mesothermal gold ores of the bogosu. Gold mineralization in the central gold belt is generally categorized as a low mesothermal lode gold deposit due to its tectonic and geological setting. In the highergrade terrains, haloes formed of hightemperature assemblages extend to between. Ductile shear zone hosted mesothermal gold mineralization of the okote area is located in southern ethiopia.
What does a greenstone mesothermal shear zone hosted mineralization deposit look like. Yamana gold auy yamana looks bottomy in the longterm. Mesothermal and greenstone gold deposits aka orogenic geology. Occurrences and characteristics of gold mineralization in rampi. A limit qf400500c is given by the chlorite and arsenopyrite geothermometers. Modern prospectors may use metal detectors to help loca gold prospectors use tools such as gold pans, sluice boxes, drywashers or highbanker. Mesothermal lode gold deposit central belt peninsular. Geochronology and structural relationships of mesothermal.
Orogenictype coppergoldarsenicbismuth mineralization. Mesothermal gold vein mineralization of the seolhwa mine, asan mining district, korea. Some common examples of minerals include quartz, graphite, talc and amethyst. Okolom dogondaji and waya veins as case studies, journal of african earth sciences 7 1988 981986. Orogenic gold, archaean archaean 350 tonnes 12 g t1 horne mine, abitibi, canada gold rich vms archaean 330 tonnes 5. Today marks the beginning of a new segment on breakout called the trade where we dont just talk about markets, but tell you the best way to play the days hottest stories. Sketch of interpreted features characteristic of the formation of gold and. Going for the gold with a new gold miners etf benzinga. Pyrite and arsenopyrite are the dominant sulfides, and gold grade is proportional to the modal abundance of sulfides. Gold prices are faltering and that is plaguing exchange traded funds tracking shares of gold miners. Its an excellent hedge against inflation because its price usually rises when the cost of living increases. Mesothermal gold mineralization at the samdong mine 5.
Carlintype gold deposits in nevada, usa, although characterized by aqueouscarbonic. Gold in stage 3 is agrich electrum fineness 350490, n12, and has a high hg content up to 11 mass %. Geodynamic setting of mesothermal gold deposits geoscienceworld. The bogosuprestea mining district of southwestern ghana is a 33 km section of the early proterozoic ashanti gold belt. Related content estimating gold ore mineralization potential within topolninsk ore field gorny altai. H jvwh gru gh hwrxu dnh hvw vlwxp j od olplwh qrug rxhvw gh od 6rxv surylqfh du. Micklethwaite introductionduring the past three decades the seismogenic behavior of fault systems has been identified as a critical process in localizing fluid migration and generating faultrelated gold deposits e. Structurally higher ores in the bogosu concession have brittle deformation and consist of disseminatedsulphide lodes in. Hinchey1 mineral deposits section abstract burin group rocks occur on the southeastern burin peninsula and consist of alkalic to tholeiitic volcanic and gabbroic. I co 2ch 4 fluids, ii lowsalinity gold deposits in wellendowed areas, such as the yilgarn and superior cratons, suggest that mineralization involved multiple stages of gold enrichment,14,15,16,17, evidence for this can be equivocal, because of the complexities associated with structural overprints and reactivations of peakmetamorphic shear zones during later events. Sedimenthosted epithermal au mineralization along the sagaing fault zone. Deposits in this class have been widely described and given many names. The seolhwa mesothermal gold mineralization were deposited in quartz veins which filled the fault shear zones in the granitoid within the gyeonggi massif. Spatial and temporal distribution of gold mineralization.
Jurassic mesothermal gold mineralization of the samhwanghak. Estimating gold ore mineralization potential within topolninsk ore field gorny altai t timkin, v voroshilov, o askanakova et al. Exchangetraded funds have popularized investing in gold miners and made that asset class more accessible to a broad swath of investors. Structurally hosted, mesothermal, lode gold deposits in metamorphic terranes constitute a single, coherent group of epigenetic precious met al deposits.
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