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The Hadamengou K

K-feldspar–quartz vein-type Au deposits represented by the Hadamengou super-large Au deposit are widely developed in the Archean high-grade metamorphic terrane in the western segment of the northern margin of the North China Craton However the formation processes of these Au deposits have long been debated and their genetic relationship Get price

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Mineralized intrusion

Mineralized intrusion-related skarn granitoids host rocks hydrothermal hydrothermal fluids igneous indicate infiltration intrusion isotopic Lentz limestone mafic magma magnetite marialite Megaw Meinert meionite melt deposits skarn formation skarn systems Sn skarns solubility stability sulfide syenitic temperature terranes types vector Get price

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2 7 Orogenic mineral system

Geoscience Australia hosts earth science related programs and events for 2 9 Alkaline intrusion-related mineral system citing the presence of a very early magnetite-scheelite-cassiterite-bearing vein assemblage (Stegman 2001) A magmatic origin for main-stage Cu-Au and Zn-Pb-Ag mineralisation is problematic as the timing of Get price

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ORE DEPOSITS OF THE JEROME AND BRADSHAW MOUNTAINS

ORE DEPOSITS OF THE JEROME AND BRADSHAW MOUNTAINS QUADRANGLES ARIZONA By Waldeman Lindgren INTRODUCTION In the summer of 1922 at the request of the Director of the United States Geological Survey I undertook an examination of the ore deposits in the Jerome and Bradshaw Mountains quadrangles Ariz (See fig 1 ) The object of this workGet price

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Alkalic Intrusion

Schroeter T G and Cameron R (1996) Alkalic Intrusion-associated Au-Ag in Selected British Columbia Mineral Deposit Profiles Volume 2 - Metallic Deposits Lefebure D V and Hy T Editors British Columbia Ministry of Employment and Investment Open File 1996-13 pages 49-51 Get price

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Mineralogical and Metallurgical Examination of

magnetite skams contain mainly granular magnetite with some tremolite talc diopside and veins or aggregates of chalcopyrite and pyrite Massive sulphide skarns are composed of pyrite pyrrhotite and some chalcopyrite (Davies et al 1978) Fluorosilicate minerals in the above skarn ores have beenGet price

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Is the Palea Kavala Bi–Te–Pb–SbAu district northeastern

The recently discovered ~4km long E–W trending so-called Kavala vein is a sheeted quartz vein system of Bi–Te–Pb–SbAu mineralization that crosscuts the Kavala pluton and the schists and gneisses of the Rhodope Massif The Kavala vein system is comprised of quartz with lesser amounts of K-feldspar plagioclase and muscovite Get price

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Intrusion–Related Vein Gold Deposits Types Tectono

5-11-2008The currently popular assignment of most gold‐rich veins to the orogenic category requires caution because of the geological convergence that they show with some intrusion‐related deposits A proper distinction between intrusion‐related and orogenic gold deposits is Get price

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MINFILE Mineral Inventory

Mineralization on the Waratah property may be classified into three catagories copper-gold veins (refer to Waratah 6 104B 204) and copper-lead-zinc-silver-gold veins (refer to Gold Bug 104B 295) both within andesitic agglomerate and native gold-pyrite veins associated with a monzonite intrusion Get price

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Permeability Geology and Hydrothermal Alteration

the presence of hot water causes the precipitation of stable magnetite from hydrothermal fluid in a hydrothermal system in vesicles and veins (Mathews 1976) while magnetite precipitation can also be associated with intrusions The oxide is first observed at 968 m as black to brown black cubic mineral filling in veins and occasionally in vesicles Get price

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(PDF) Intrusion

The deposits are related genetically to felsic domes stocks or plutons of intermediate oxidation state both magnetite- and ilmenite-series magmas are represented The intrusion-hosted gold deposits are most commonly of sheeted vein/veinlet type although greisen-like disseminated and breccia deposits are also described Get price

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Trace Element Composition of Igneous and Hydrothermal

Igneous and hydrothermal magnetite related to alkaline magma is relatively rich in Mg Mn Co Mo Sn and high field strength elements (HFSEs) perhaps due to high concentrations of chlorine and fluorine in magma and exsolved fluids whereas those related to calc-alkaline magma are relatively rich in Ca but depleted in HFSEs consistent with Get price

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Global Fe–O isotope correlation reveals magmatic origin of

12-4-2019We show that approximately 80% of the magnetite from the investigated Kiruna-type ores exhibit δ56Fe and δ18O ratios that overlap with the volcanic and plutonic reference materials ( 800 C) whereas ~20% mainly vein-hosted and disseminated magnetite match the low-temperature reference samples (≤400 C) Get price

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Wisconsin Geological Natural History Survey Gold

Gold may form in exhalative deposits formed on the sea floor associated with Archean basaltic sequences known as greenstone belts It may form in veins associated with large granite intrusions associated with mountain building It may also form in veins formed along major fault zones Gold in veins is associated with sulfides quartz and calcite Get price

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Prospects look good in north Queensland

Prospects look good in north Queensland By David Champion Geoscience Australia is releasing updated datasets of various metallogenic parameters for intrusive and country rock units in north Queensland to assist the exploration industry's search for intrusion-related mineralisation systems Get price

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Abstract THE MURRAY GOLD DISTRICT SHOSHONE

Historic production has been primarily Au from placers and bedding-parallel sheeted quartz veins though there has been limited historic Ag Zn Pb Cu and W production as well The southeastern edge of the district is intruded by several small mid-cretaceous monzonite intrusions Get price

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GEOFIELD GEOFIELD

18-6-2019qualified geology engineering Ofrecer a la sociedad conocimientos tcnicos adquiridos del estudio de la Geologa en su vertiente aplicada apoyndose en la slida base proporcionada por las tcnicas de las ingenieras clsicas junto con el conocimiento de los ltimos avances tecnolgicos Get price

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IOCG Iron Oxide Copper Gold Ore Deposits

IOCG Iron Oxide Copper Gold Ore Deposits goes with porphyries as they are also loosely associated with a large felsic intrusions and form at moderate depths unlike the dominantly tertiary porphyries IOCG's tend to be much older and are generally protoizoic in age from 1 1 to 1 8 billion years ago Get price

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Smyrnios Ashern Mineral Resources

Ashern Mineral Resources •Primary are lode or intrusion-related •Lode deposits are high-grade thin vein or fault-hosted Usually in quartz veins or reefs •Usually hosted in basalt or in sediments known as turbidites although when in faults that may be in graniteGet price

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Geological and Geochemical Characteristics of the

Other ore minerals include chalcopyrite specular hematite and magnetite suggesting the intrusion‐related oxidized vein‐type deposit denominated by Sillitoe and Thompson The analyzed Au contents of the veins weakly correlate with Ag contents but are not correlative with Cu contents Get price

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Titaniferous Magnetite Mineral information data and

28-9-2006A titanium-bearing variety of magnetite Zircon 5 photos of Titaniferous Magnetite associated with Zircon on mindat Ferro-ferri-katophorite 3 photos of Titaniferous Magnetite associated with Ferro-ferri-katophorite on mindat Nepheline 2 photos of Titaniferous Magnetite Get price

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Quartz

Quartz-Tourmaline Veins in the Northern Sierra Nevada Area Summer 1991 Tourmaline-bearing quartz veins and replacement deposits commonly copper- and gold-bearing are found in unusual concentration in northwestern Nevada and adjacent northeastern California in Triassic and Jurassic arc rocks and in the Cretaceous plutons that intrude them Get price

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in north Queensland

mineral system known as intrusion-related gold (IRG) See figure 1 and table 1 and also Thompson et al (1999) Broad styles are included within IRG mineral systems They range from those proximal to granites (e g greisen disseminated gold skarns) to more distal and controversial styles such as breccias and vein systemsGet price

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Copper

Copper-Gold Bearing Skarn Mineralization at the Batu Hijau Deposit Sumbawa Island Indonesia (M T Aye et al ) 195 Figure 3 Photograph showing the typical features of skarn (a) banded nature of pyroxene and garnet (b) quartz vein across cutting the pyroxene abundance skarn (c) quartz calcite vein which includes ore mineraliza-Get price

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Postmagmatic magnetite

We conclude that the mafic dykes were a local source of Fe and P re-concentrated in the magnetite-apatite veins Uranium-Pb ages for vein apatite and titanite associated with the vein in this case study suggest that alteration of the dolerite and healing of the fractures occurred shortly after Get price

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2 4 Iron oxide copper

Iron oxide copper-gold (IOCG) deposits (Hitzman et al 1992) are a diverse family of mineral deposits characterised by the following features (1) Cu with or without Au as economic metals (2) hydrothermal ore styles and strong structural controls (3) abundant magnetite and/or hematite (4) Fe oxides with Fe/Ti greater than those in most Get price

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PROGRAM at 25 MAY 2017

PROGRAM at 25 MAY 2017 (subject to change) DAVID GROVES SYMPOSIUM New Insights in Mineral Deposit Understanding low sulphidation epiteal vein systems - insights from Cracow Teimoor Nazari-Dehkordi The Browns Range The relationship between orogenic gold and intrusion-related gold systems in the Permo-Carboniferous of northeast Get price

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Geology Exploration

The electromagnetic survey was designed to detect conductive sulphide horizons within the generally non-conductive ultramafic intrusion The intense conductivity in the sequence of phyllitic rocks surrounding the ultramafic intrusion is related to graphite and pyrite on bedding and foliation planes and is of limited exploration interest Get price

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The magnetite

5 The magnetite-apatite ore of the Kiruna district Northern Sweden typical accessory mineral of this ore and filling fractures and vesicular openings in the magnetite as well as in the wall rocks Copper sulphides like chalcopyrite have been recognized but they are rare (HITZMAN 1992) Get price

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The mineralogical characteristics of the hydrothermal

The NE-SE vein field is related to porphyry quartz-micromonzodio-rites stock carbonates sericite pyrite magnetite Propylitic alteration in the inner zone of the hydrothermal ore deposit has pervasive character The It is typical for the adjacent zones of the veins within the main intrusions Get price

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Abstract record 2003 14 part2

that areas to the west of Majors Creek are prospective for additional granite-related gold mineralisation in the shallow subsurface roof zone of the intrusion and in vein and possibly skarn systems in the overlying rocks Erosion of large areas of granite containing small but widespread gold deposits similar toGet price

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Minerals in Afghanistan

Copper in small porphyritic intrusions of Tertiary age were documented during the 1970s (Dronov et al 1972 Chmyriov 1972) In Iran all significant porphyry mineralisation is related to Tertiary subduction-related granitoids hence they are attractive targets in Afghanistan Cu-Au Get price

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