pyrite hosted iron ore deplosits

Mineralogy, geochemistry, and genesis of the volcanic ...

The Somea iron deposit is located ~ 22 km northwest of Ahar, NW Iran. The lenticular iron ores are formed as open space fillings within the pinch and swell structures of a curved fault in a highly brecciated zone within the host andesitic to dacitic rocks. Fe mineralization comprises magnetite and pyrite in the hypogene zone and hematite, limonite, and goethite in the …

(PDF) Sedimentary Hosted Iron Ores - ResearchGate

percent of the iron ore deposits hosted in BIF are located in. China and to some extent in North America. China represents ... greenalite, pyrite and rare chamosite, ripidolite, …

POLYMETALLIC VEIN AND REPLACEMENT DEPOSITS (MODELS …

Deposits consist of massive lenses and (or) pipes, known as mantos or replacement orebodies, and veins of iron, lead, zinc, and copper sulfide minerals that are hosted by and replace limestone, dolomite, or other sedimentary rocks; most massive ore contains more than 50 percent sulfide minerals. Sediment-hosted ore commonly is intimately

CHAPTER-5 GEOCHEMISTRY OF IRON ORES

Majority of the iron ore deposits (Fig.- 5.1) are confined to Banded iron formation (BIF) of Proterozoic volcano-sedimentary sequence (supracrustal) of age 2.5-2.4Ga, 2.2 - 2.06Ga and 2.0Ga. Thus, Complex genetic process has a control over the mineralogical and geochemical attribute of the iron ore, associated rocks and their host rocks. The

The metamorphism of pyrite and pyritic ores: an overview ...

Pyrite, the most widespread and abundant of sulphide minerals in the Earth's surficial rocks, commonly constitutes the primary opaque phase in ore deposits. Consequently, an understanding of the behaviour of pyrite and its relationships with coexisting phases during the metamorphism of pyritebearing rocks is vital to the interpretation of their ...

SEDIMENT-HOSTED AU DEPOSITS (MODEL 26a; Berger, 1986)

Carlin-type deposits show no clear genetic relationship to other types of ore deposits. Locally, they may be present in the vicinity of volcanic-hosted precious metal deposits, epizonal pluton-related porphyry, skarn, manto, or vein deposits, syngenetic base-metal or barite deposits…

Geochemistry and iron isotope systematics of coexisting Fe ...

Geochemical and iron isotopic compositions of magnetite, ilmenite and pyrite separates from the Fe Ti oxide ores hosted in the Damiao anorthosite-type Fe Ti ore deposit were analyzed to investigate sub-solidus cooling history of the titanomagnetite. The Fe Ti oxides form two series of solid solutions, namely, ulvöspinel-magnetite (Usp-Mt ss) and hematite-ilmenite (Hem-Ilm ss) …

Syngenetic pyrite associated with a Precambrian iron ore ...

The Steeprock pyritic zones are conformable, lenticular bodies in and along the hanging wall of an iron ore-bearing member of a Precambrian volcanic-sedimentary sequence in north western Ontario. The zones contain about 50 percent pyrite. About 90 percent of this pyrite consists of fragments possessing coloform and cryptocrystalline textures.

Synsedimentary, Diagenetic, and Metamorphic Pyrite ...

The Paleoproterozoic Homestake deposit, northern Black Hills, South Dakota, is the largest banded iron-formation (BIF)-hosted gold deposit in the world and one of the largest single gold deposits globally (~1,300 t Au mined at an average grade of 8.4 g/t).

Carlin-Type Gold Deposits in Nevada: Critical Geologic ...

tive host rocks, where they sulfidized host rock iron and deposited Au. Sedimentary rock-hosted disseminated Au deposits in other parts of the world exhibit many similarities to Nevada Carlin-type Au deposits, yet no district has been discovered anywhere else that approaches Nevada's Au productivity.

POLYMETALLIC VEIN AND REPLACEMENT DEPOSITS …

Deposits consist of massive lenses and (or) pipes, known as mantos or replacement orebodies, and veins of iron, lead, zinc, and copper sulfide minerals that are hosted by and replace limestone, dolomite, or other sedimentary rocks; most massive ore contains more than 50 percent sulfide minerals. Sediment-hosted ore commonly is intimately

Trace element distribution, Co:Ni ratios and genesis of ...

Analyses of pyrite, chalcopyrite and magnetite from the volcanic-hosted Big Cadia stratabound iron-copper deposit in Central Western New South Wales show considerable variation in the minor elements Mn, Ba, Ag, Pb, Zn, Cd, Se, Co and Ni. The preferential concentration of Co and Cd in pyrite, Zn and Ag in chalcopyrite and Mn in magnetite can be attributed to variations in activities of the ions ...

(PDF) The BIF-Hosted High-Grade Iron Ore Deposits in the ...

The Koolyanobbing banded iron formation (BIF)-hosted iron ore deposits (total premining resources ∼150 million metric tons (Mt), indicated reserves ∼32 Mt) are located in the Mesoarchean lower ...

Invisible Gold in Pyrite from Epithermal, Banded-Iron ...

The Au concentrations in pyrrhotite and pyrite reach 6 and 0.3 ppm, respectively, in the Kalahari Goldridge banded-iron-formation-hosted gold deposit, and Au in pyrrhotite may sometimes exist as NPs, whereas As concentrations in pyrrhotite and pyrite are both low and lie …

METALLIC ORE DEPOSITS OF MONTANA - MBMG

Banded Iron Formations Large deposits of Precambrian banded iron for-mation (BIF) exist in southwest Montana (Bayley and James, 1973). For example, the Carter Creek deposit, in the western Ruby Range, contains an estimated 95 million tons of ore grading 28–29% Fe, mainly as magnetite (James, 1990). The smaller Kelly iron

(PDF) Sedimentary Hosted Iron Ores - ResearchGate

percent of the iron ore deposits hosted in BIF are located in. China and to some extent in North America. China represents ... greenalite, pyrite and rare chamosite, ripidolite, ferri-annite, and ...

METALLIC ORE DEPOSITS OF MONTANA

Banded Iron Formations Large deposits of Precambrian banded iron for-mation (BIF) exist in southwest Montana (Bayley and James, 1973). For example, the Carter Creek deposit, in the western Ruby Range, contains an estimated 95 million tons of ore grading 28–29% Fe, mainly as magnetite (James, 1990). The smaller Kelly iron

Distinguishing Ore Deposit Type and Barren Sedimentary ...

Specifically, we used LA-ICP-MS pyrite trace element data and Random Forests, an ensemble machine learning supervised classifier, to distinguish barren sedimentary pyrite and five ore deposit categories: iron oxide copper-gold (IOCG), orogenic Au, porphyry Cu, sedimentary exhalative (SEDEX), and volcanic-hosted massive sulfide (VHMS) deposits.

Trace element distribution, Co:Ni ratios and genesis of ...

12%Analyses of pyrite, chalcopyrite and magnetite from the volcanic-hosted Big Cadia stratabound iron-copper deposit in Central Western New South Wales show considerable variation in the minor elements Mn, Ba, Ag, Pb, Zn, Cd, Se, Co and Ni. The preferential concentration of Co and Cd in pyrite, Zn and Ag in chalcopyrite and Mn in magnetite can be attributed to variations in activities of …

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