origin of ore deposits

Geology of Ore Deposits is a periodical covering the topic of metallic and nonmetallic mineral deposits, their formation conditions, and spatial and temporal distribution.The journal publishes original scientific articles and reviews on a wide range of problems in theoretical and applied geology.

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The South African Iron Ore Cluster Page 2 2.0 HISTORY OF SOUTH AFRICA In 1652, Dutch settlers landed at the Cape of Good Hope to develop farming for ships en route to

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Mining is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lode, vein, seam, reef or placer deposit.These deposits form a mineralized package that is of economic interest to the miner. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay.

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Iron-ore mining methods vary by the type of ore being mined. There are four main types of iron-ore deposits worked currently, depending on the mineralogy and geology of the ore deposits. These are magnetite, titanomagnetite, massive hematite and pisolitic ironstone deposits. Banded iron formations

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Mineral deposit - Mineral deposit - Hydrothermal solution: Hydrothermal mineral deposits are those in which hot water serves as a concentrating, transporting, and depositing agent. They are the most numerous of all classes of deposit. Hydrothermal deposits are never formed from pure water, because pure water is a poor solvent of most ore minerals.

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ELSEVIER Earth and Planetary Science Letters 156 (1998) 185-193 EPSL Origin of podiform chromite deposits by magma mingling Chris Ballhaus v. Institnt fiir Mineralogie and Geochemie, Universitdt Kiiln, Zulpicher Str. 496, 50674 Koln, and lnstitnt.fur Mineralogie, Universitdt Tiibingen, Wilhebnsir 56, 72074 Tiibingen, Germany Received 21 April 1997: revised version received 9 December 1997 ...

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Microanalysis of major and trace elements in sulfide and silicate melt inclusions by laser-ablation inductively coupled plasma mass spectrometry indicates a direct link between a magmatic sulfide liquid and the composition of porphyry-type ore deposits. Copper (Cu), gold (Au), and iron (Fe) are first concentrated in a sulfide melt during magmatic evolution and then released to an ore-forming ...

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Porphyry copper deposits are copper orebodies that are formed from hydrothermal fluids that originate from a voluminous magma chamber several kilometers below the deposit itself. Predating or associated with those fluids are vertical dikes of porphyritic intrusive rocks from which this deposit type derives its name. In later stages, circulating meteoric fluids may interact with the magmatic ...

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Ore deposit synonyms, Ore deposit pronunciation, Ore deposit translation, English dictionary definition of Ore deposit. a mineral from which a metal can be extracted for profit Not to be confused with: oar – a long pole used to row a boat o'er – over n. A mineral or an...

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From the days of Agricola, the founder of the science of ore deposits, successive authors on the subject have attempted classifications, none of which have attained unanimous endorsement of miners, engineers, or geologists. The miner and engineer naturally have little regard for a classification that does not help them to find ore.

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The Meikle mine exploits one of the world's highest grade Carlin-type gold deposits with reserves of ca. 220 t gold at an average grade of 24.7 g/t. Locally, gold grades exceed 400 g/t. Several geologic events converged at Meikle to create these spectacular gold grades. Prior to mineralization, a Devonian hydrothermal system altered the Bootstrap limestone to Fe-rich dolomite.

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Surveying and geometric observations of surface movements in the wider area of the mine from the beginning of the 20th century onwards, as well as the excellent geological and hydrogeological studies and interpretations of the origin of the ore deposit and subsequent tectonic and other occurrences are a useable base for deep interpretation for the complex deformation process.

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ADVERTISEMENTS: In this article we will discuss about:- 1. Introduction to Ore Deposits 2. Origin of Ore Deposits 3. Types. Introduction to Ore Deposits: Minerals form chief source of all the industrial metals and non-metals. The commonly used metals like aluminum, copper, iron, lead, zinc etc. are all manufactured using minerals as raw materials.

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Processes of Ore Formation. Current theories of the genesis of ore deposit can be divided into internal (endogene) and external (exogene) or surface processes. It must be understood that more than one mechanism may be responsible for the formation of an ore body.

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Epithermal mineral ore deposits are formed at low temperatures (50-200 °C) near the Earth's surface (<1500 m), that fill veins, breccias, and stockworks. Telethermal mineral ore deposit are formed at shallow depth and relatively low temperatures, with little or no wall-rock alteration, presumably far from the source of hydrothermal solutions.

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Ore deposits mined solely for vanadium are rare because much of the vanadium in igneous rocks occurs in the relatively insoluble trivalent state, substituting for ferric iron in ferromagnesium silicates, magnetite (an… Read More; zinc

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Apr 12, 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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A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text.

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Oct 22, 2017· Classification of ore deposits 1. CONTENTS Introduction Niggli's classification of ore deposits Schneiderhohn's classification of ore deposits Lindgren's classification of ore deposits Lindgren's classification of ore deposits modified 1985 Bateman classification of ore deposits Stanton classification of ore deposits Guilbert and park classification of ore deposits Conclusion …

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GEOLOGY AND ORE DEPOSITS OF THE SHAFTER MINING DISTRICT, PRESIDIO COUNTY, TEXAS By CLYDE P. Ross ABSTRACT The Shafter mining district is principally notable for the Presidio mine, which »has been in almost continuous operation since 1880 and …

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Natural concentration of an ore mineral in an massive rock body is defined as an ore deposit. It may have different shapes and forms but size is of real importance. A small patch or layer of iron, say one meter thick and a kilometer long will not make an ore deposit. The deposit has to …

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Ore Deposits are rocks found across Hyrule that can be destroyed for Materials in The Legend of Zelda: Breath of the Wild. They are large and shiny rocks that can be destroyed by Link to mine gems and mineral based materials. The deposits contain a good deal of ores and breaking the rock will...

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Ore deposits are rarely comprised of ore-bearing minerals, but are usually associated with rock-forming minerals during the mineralization process. These associated minerals or rocks, having no significant or low commercial value, are called gangue minerals. Pure chalcopyrite having 34.5% Cu metal in copper deposit and sphalerite with 67% Zn metal in zinc deposit are hosted by quartzite ...

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Sep 17, 2017· This set of Engineering Geology Multiple Choice Questions & Answers (MCQs) focuses on "Origin of Ore Deposits". 1. What is the mineral which contains a metallic element which can be economically exploited called?

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Iron ore deposits were found in many areas of the United States, but mining was centered in western Pennsylvania and eastern Ohio during the post-Civil War period. Iron production and the emerging steel industry developed around Pittsburgh, which enjoyed the additional advantage of nearby coal fields.. Phenomenal industrial growth in the 1870s and 1880s, seriously depleted many of the known ...

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Mining Iron Ore in Africa. Because iron ore is the key ingredient of steel, and nearly 95% of the metal used every year around the world is steel – iron is the most frequently used metal in the world. Iron-rich rocks are found all over the world but the rocks are only ore-grade and suited for commercial production in some countries.

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The spark to put together this volume on banded iron formation (BIF)-related high-grade iron ore was born in 2005 during a steamy night in Carajás where the iron research group from the Universidade Federal Minas Gerais, Vale geologists, Carlos Rosière and Steffen Hagemann, were hotly debating the hypogene alteration genesis for the high-grade, jaspilite-hosted Serra Norte iron ore deposits.

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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 including ...

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The basic extraction of ore deposits follows these steps: Prospecting or exploration to find and then define the extent and value of ore where it is located ("ore body") Conduct resource estimation to mathematically estimate the size and grade of the deposit; Conduct a pre-feasibility study to determine the theoretical economics of the ore deposit.

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Mineral deposit - Mineral deposit - Formation of mineral deposits: Mineral deposits form because some medium serves as a concentrating and transporting agent for the ore minerals, and some process subsequently causes the transporting agent to precipitate, or deposit, the minerals. Examples of concentrating and transporting agents are groundwater, seawater, and magma; examples of …

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