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Iron ore - Wikipedia

Metallic iron is virtually unknown on the surface of the Earth except as iron-nickel alloys from meteorites and very rare forms of deep mantle xenoliths. Some iron meteorites are thought to have originated from accreted bodies 1,000 km in diameter or larger. The origin of iron can be ultimately traced to formation through nuclear fusion in stars and most of the iron is thought to have originated in dying stars that are large enough to collapse or explode as supernovae. Although iron is the fourth-most abundant element i

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origin of iron ore deposits - Beaumont Balades

The iron ore deposits began forming when the first organisms capable of photosynthesis began releasing oxygen into the waters. This oxygen immediately combined with the abundant dissolved iron to produce hematite or magnetite. These minerals deposited on the

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SP-02 Geology and Origin of the Iron Ore Deposits of the ...

It is concluded (1) that the deposits were formed by the replacement of the silica in the iron-formation by hematite, (2) that the iron probably was transported in large part as free ferrous ions in an acid hydrothermal fluid, (3) that deposition and replacement was largely restricted to the jaspilite because of its brecciation, and (4) that two of the principal causes of ore deposition were an increase in pH of the

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Mineral Ore Deposits: Meaning, Origin and Types Geology

Some very important deposits of ores of iron, copper, gold, phosphates and coal are of sedimentary origin. Their accumulation takes place due to one or more of the following processes: (a) Weathering:

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Origin of sedimentary hosted high-grade iron ore deposits

• From the 1840s to the 1960s more than 3 billion tonnes of iron ore were mined from sedimentary-hosted high grade iron ore deposits in Michigan, Minnesota and Ontario • This abundant source of iron ore coupled with new steelmaking processes helped fuel rapid industrial expansion in

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Iron Deposits – Banded Iron Formations (BIF) Geology for ...

12/08/2013  There are some other smaller BIFs deposits that are significantly younger, and there is some argument about their origin. Although some would point to a global freezing event (“snowball earth”) which isolated the seas from the oxygen-rich atmosphere, it’s probably more likely that these later deposits, formed in small, stagnant inland seas or lakes which were at least in part anoxic. For example, the Black Sea would create BIFs today if enough iron

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Mineral deposit - Iron deposits Britannica

European oolitic iron deposits, commonly called Minette-type deposits, contain ooliths of siderite, a siliceous iron mineral known as chamosite, and goethite. The deposits were formed in shallow, near-shore marine environments and are most extensively developed in England, the Lorraine area of France, Belgium, and Luxembourg.

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Geology, Prospecting and Exploration for Iron Ore Deposits ...

09/04/2015  Iron ore deposits are distributed in different regions of the world under varied geological conditions and in different geological formations. The largest ore concentration is found in banded sedimentary iron formations of Precambrian age. These formations constitute the bulk of iron ore resources of the world. Iron ores occur in a wide variety of geological environments in igneous ...

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Huge reserves of iron in Western Siberia might originate ...

28/12/2018  The world's largest Bakchar iron ore deposit is located in an ancient sea in West Siberia, Russia. Its proven reserves are over 28 billion tons. Scientists seek to explain the accumulation of such ...

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Origin of sedimentary hosted high-grade iron ore deposits

Origin of sedimentary hosted high-grade iron ore deposits Old models, new ideas and implications for exploration in the Labrador Trough James Conliffe Geological Survey of Newfoundland and Labrador. Sedimentary hosted high-grade iron ore deposits • Sedimentary hosted iron ore deposits account for ~ 90% of current iron production worldwide • Most production comes from high-grade (> 55% Fe ...

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Mineral deposit - Iron deposits Britannica

Mineral deposit - Mineral deposit - Iron deposits: By far the most important metal from an economic and technical point of view is iron. Sedimentary iron deposits, from which almost all iron is obtained, can therefore be viewed as one of the world’s great mineral treasures. There are two major types of deposit. The first, and by far the most important, is banded iron formations (BIFs), so ...

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Origin of Choghart Iron Oxide Deposit, Bafq Mining ...

2 Gt of iron oxide ore [4]. Most of the deposits are unexploited or only partially mined. Choghart is the first deposit of its kind exploited in the Bafq mining district. The remaining total reserve of Choghart is estimated to be 200 Mt. The first apatite-rich iron oxide ore was shipped to Isfahan steel mill (the largest mill in Iran) in 1971, and since then, Choghart has remained the main ...

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Iron Deposits – Banded Iron Formations (BIF) Geology

11/08/2013  Iron ore is mined and processed in the remote open-pit mine sites. After crushing and screening of the ore on site, the ore is carefully graded. There is sophisticated automatic sampling prior to shipping the ore via train to the port at Dampier over 1000km away, on the world’s longest private railway. Ore is shipped directly to Asia and elsewhere from the major ports of Dampier and Port ...

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Geology, Prospecting and Exploration for Iron Ore

09/04/2015  Iron ore deposits are distributed in different regions of the world under varied geological conditions and in different geological formations. The largest ore concentration is found in banded sedimentary iron formations of Precambrian age. These formations constitute the bulk of iron ore resources of the world. Iron ores occur in a wide variety of geological environments in igneous ...

More

Learning Geology: Iron Ore

17/03/2015  The iron ore deposits are found in sedimentary rocks. They are formed by the chemical reaction of iron and oxygen mixed in the marine and fresh water. The important iron oxides in these deposits are hematite and magnetite. These are ores from where iron is extracted. Iron ore formation . The iron ore formation started over 1.8 billion years ago when abundant iron was dissolved in the

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Huge reserves of iron in Western Siberia might originate ...

28/12/2018  The world's largest Bakchar iron ore deposit is located in an ancient sea in West Siberia, Russia. Its proven reserves are over 28 billion tons. Scientists seek to explain the accumulation of such ...

More

Iron ore deposits of india - SlideShare

22/10/2017  Origin and classification of Iron ore deposits: The iron ore deposits of India can be broadly divided in to the following six groups on the basis of mode of occurrence and origin: o Banded Iron Formation of Pre-Cambrian Age o Sedimentary iron ore deposits of siderite and limonitic composition o Laterite ores derived from the sub-aerial alterations o Ores formed by magmatic activity

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Immiscible hydrous Fe–Ca–P melt and the origin of iron ...

12/04/2018  The origin of iron oxide-apatite deposits is controversial. Silicate liquid immiscibility and separation of an iron-rich melt has been invoked, but Fe–Ca–P-rich and Si-poor melts similar in ...

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WEALDEN IRON - hammer pond

Early iron smelting The Weald’s iron deposits lie relatively close to the ground surface, and so were easily extracted by open cast mining. Most extraction and smelting took place in the High Weald, a section stretching roughly east of Horsham across to south of Tunbridge Wells, and down to Hastings. High yields were obtained within this geological triangle: beneath the Wadhurst Clay in the ...

More

Origin of Choghart Iron Oxide Deposit, Bafq Mining ...

2 Gt of iron oxide ore [4]. Most of the deposits are unexploited or only partially mined. Choghart is the first deposit of its kind exploited in the Bafq mining district. The remaining total reserve of Choghart is estimated to be 200 Mt. The first apatite-rich iron oxide ore was shipped to Isfahan steel mill (the largest mill in Iran) in 1971, and since then, Choghart has remained the main ...

More

Chapter 2 Origin and Timing of Banded Iron Formation ...

HIGH-GRADE (60 wt % Fe) hematite iron ore deposits that are hosted by banded iron formation (BIF) are known for all the continents, excluding Antarctica. These deposits are the products of the enrichment of Precambrian BIFs, and they are one of the most important sources of iron ore today (U.S. Geological Survey, 2007). Many high-grade hematite ore-bodies consist of “soft” martite-hematite ...

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Learning Geology: Iron Ore

17/03/2015  The iron ore deposits are found in sedimentary rocks. They are formed by the chemical reaction of iron and oxygen mixed in the marine and fresh water. The important iron oxides in these deposits are hematite and magnetite. These are ores from where iron is extracted. Iron ore formation . The iron ore formation started over 1.8 billion years ago when abundant iron was dissolved in the

More

Geology, Prospecting and Exploration for Iron Ore

09/04/2015  Iron ore deposits are distributed in different regions of the world under varied geological conditions and in different geological formations. The largest ore concentration is found in banded sedimentary iron formations of Precambrian age. These formations constitute the bulk of iron ore resources of the world. Iron ores occur in a wide variety of geological environments in igneous ...

More

The origin of terrestrial pisoliths and pisolitic iron ore ...

Pisolitic iron ores (aka channel iron deposits, CID) are a special case of transported pisolitic ferricrust that form an important resource of medium grade iron ore (57–60 wt% Fe) in the Pilbara Region of Western Australia. Apart from minor deposits in the northern Yilgarn Province of Western Australia, they have not been found elsewhere. They differ from normal transported ferricrust and ...

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The origin of terrestrial pisoliths and pisolitic iron ore ...

15/07/2016  The origin of terrestrial pisoliths and pisolitic iron ore deposits: Raindrops and sheetwash in a semi-arid environment 1. Introduction. Pisoliths are abundant in terrigenous deposits and soil profiles in many parts of Australia and... 2. Part A: Terrestrial pisoliths. Beds of unfossiliferous, ...

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Huge reserves of iron in Western Siberia might originate ...

28/12/2018  The world's largest Bakchar iron ore deposit is located in an ancient sea in West Siberia, Russia. Its proven reserves are over 28 billion tons. Scientists seek to explain the accumulation of such ...

More

An overview on the characteristics and origin of iron ...

The ore bodies of each deposit are obviously controlled by tectonics , and most of them are lenticular ... An overview on the characteristics and origin of iron-oxide copper gold (IOCG) deposits in China. Acta Petrologica Sinica, 35 (1): 99-118 (in Chinese with English abstract) Zhao XF, Zhou MF, Su ZK, et al., 2017. Geology, geochronology, and geochemistry of the DahongshanFe-Cu-(Au-Ag ...

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Immiscible hydrous Fe–Ca–P melt and the origin of iron ...

The origin of iron oxide-apatite deposits is controversial. Silicate liquid immiscibility and separation of an iron-rich melt has been invoked, but Fe–Ca–P-rich and Si-poor melts similar in composition to the ore have never been observed in natural or synthetic magmatic sys-tems. Here we report experiments on intermediate magmas that develop liquid immiscibility at 100MPa, 1000–1040°C ...

More

WEALDEN IRON - hammer pond

Early iron smelting The Weald’s iron deposits lie relatively close to the ground surface, and so were easily extracted by open cast mining. Most extraction and smelting took place in the High Weald, a section stretching roughly east of Horsham across to south of Tunbridge Wells, and down to Hastings. High yields were obtained within this geological triangle: beneath the Wadhurst Clay in the ...

More

Iron Ore: Sedimentary Rock - Pictures, Definition More

The iron ore deposits began forming when the first organisms capable of photosynthesis began releasing oxygen into the waters. This oxygen immediately combined with the abundant dissolved iron to produce hematite or magnetite. These minerals deposited on the sea floor in great abundance, forming what are now known as the "banded iron formations." The rocks are "banded" because the iron ...

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The Origin of the Iron Ore deposits of Donimalai area of ...

01/01/1995  There are 6 ore deposits comprising 9 ore bodies having more than 150 million tonnes of high grade hematite ore in Donimalai area. Banded Iron Formation (BIF) is the host rock for the iron ore deposits. Basaltic rocks, shales with tuff, dolerite and quartz veins are other important litho-units in this area. Principaly the BIF consists of alternative bands of iron oxides and chert belonging to ...

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Origin of Choghart Iron Oxide Deposit, Bafq Mining ...

2 Gt of iron oxide ore [4]. Most of the deposits are unexploited or only partially mined. Choghart is the first deposit of its kind exploited in the Bafq mining district. The remaining total reserve of Choghart is estimated to be 200 Mt. The first apatite-rich iron oxide ore was shipped to Isfahan steel mill (the largest mill in Iran) in 1971, and since then, Choghart has remained the main ...

More

An overview on the characteristics and origin of iron ...

The ore bodies of each deposit are obviously controlled by tectonics , and most of them are lenticular ... An overview on the characteristics and origin of iron-oxide copper gold (IOCG) deposits in China. Acta Petrologica Sinica, 35 (1): 99-118 (in Chinese with English abstract) Zhao XF, Zhou MF, Su ZK, et al., 2017. Geology, geochronology, and geochemistry of the DahongshanFe-Cu-(Au-Ag ...

More

Immiscible hydrous Fe–Ca–P melt and the origin of iron ...

The origin of iron oxide-apatite deposits is controversial. Silicate liquid immiscibility and separation of an iron-rich melt has been invoked, but Fe–Ca–P-rich and Si-poor melts similar in composition to the ore have never been observed in natural or synthetic magmatic sys-tems. Here we report experiments on intermediate magmas that develop liquid immiscibility at 100MPa, 1000–1040°C ...

More

Ore Deposits: Origin, Exploration, and Exploitation Wiley

The latest knowledge on mineral ore genesis and the exploration of ore deposits Global demand for metals has risen considerably over the past decade. Geologists are developing new approaches for studying ore deposits and discovering new sources. Ore Deposits: Origin, Exploration, and Exploitation is a compilation of diverse case studies on new prospects in ore deposit geology

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Geochemistry and the origin of the Mamouniyeh iron ore ...

Introduction\ud Iron is among the metals whose ore deposits are not confined to a specific geologic period of crustal formation and they have formed in various geologic environments during previous periods (Ghorbani, 2007). About 95% of iron ore deposits have sedimentary origin and have formed due to chemical deposition from ancient sea water. The remaining percent is the result of alteration ...

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INTERNATIONAL JOURNAL OF SCIENTIFIC TECHNOLOGY

Karfe Oolitic Iron Ore Deposit, Bida Basin. Kogi State, Nigeria A. Imrana, Dr.I.V Haruna ... models have been proposed for the origin of ironstones deposits in the Bida basin. [6] believed that the deposits are similar to the minette-type ironstones because the depositional patterns in the basin favour ooids formation within the high energy (shallow marine) domains. Such a model generally ...

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Classification of ore deposits - SlideShare

22/10/2017  However, genetic classifications are very dangerous, as they assume that we know the origin of the ore deposit, which, in many cases, we don’t! They are also subject to change as scientists revise their models for the genesis of an ore deposit. This leaves us with using the “environment” of the ore body or its “geologic setting” as perhaps the best criterion for the classification of ...

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WEALDEN IRON - hammer pond

Early iron smelting The Weald’s iron deposits lie relatively close to the ground surface, and so were easily extracted by open cast mining. Most extraction and smelting took place in the High Weald, a section stretching roughly east of Horsham across to south of Tunbridge Wells, and down to Hastings. High yields were obtained within this geological triangle: beneath the Wadhurst Clay in the ...

More