origin of ore deposits

Volcanogenic massive sulfide ore deposit

The ore materials are trapped within a fumarole field or a black smoker field when they are expelled into the ocean cool and precipitate sulfide minerals as stratiform sulfide ore Some deposits show evidence of formation via deposition of sulfide via replacement of altered volcanosedimentary rocks and may also form by invasion of sulfur-rich...

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Origin of high

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 247 g/t Locally gold grades exceed 400 g/t Several geologic events converged at Meikle to create these spectacular gold grad Prior to mineralization a Devonian hydrothermal system altered the Bootstrap limestone to Fe-rich dolomite...

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The Origin of Cu/Au Ratios in Porphyry

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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ORIGIN OF CERTAIN RICH SILVER ORES NEAR CHLORIDE

ORIGIN OF CERTAIN RICH SILVER ORES NEAR CHLORIDE AND KINGMAN ARIZONA By EDSON S BASTIN INTRODUCTION The mineral deposits of the Cerbat Mountains between Kingman and Chloride in northwestern Arizona were described by Schrader 1 in 1909 The writer visited some of the silver mines and prospects...

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Ore Deposits Geophysical Monograph Series

Mar 29 2019 0183 32 Ore Deposits Origin Exploration and Exploitation is a compilation of diverse case studies on new prospects in ore deposit geology including atypical examples of mineral deposits and new methods for ore exploration Volume highlights include Presentation of the latest research on a range of ore deposit types...

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Mineral deposit Britannica

All ore deposits are mineral deposits but the reverse is not true Ore deposit is an economic term while mineral deposit is a geologic term Whether a given mineral deposit is also an ore deposit depends on many factors other than the level of concentration and the size of the deposit all factors that affect the mining processing and transporting of the ore must be considered as well...

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A Brief History of Mining

History of Mining History of Minning Ancient Tools and Basket The earliest known mine for a specific mineral is coal from southern Africa appearing worked 40 000 to 20 000 years ago But mining did not become a significant industry until more advanced civilizations developed 10 000 to 7 000 years ago...

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Ore deposits origin exploration and exploitation in

Ore Deposits Origin Exploration and Exploitation is a compilation of diverse case studies on new prospects in ore deposit geology including atypical examples of mineral deposits and new methods for ore exploration Volume highlights include Presentation of the latest research on a range of ore deposit types Application of ore deposits to...

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USGS Info Handout Stable Isotopes and Mineral Resource

Defining the origin of the world-class Sullivan lead-zinc-silver deposit British Columbia Canada with implications for the occurrence of similar deposits in western Montana and northern Idaho Any use of trade product or firm names in this publication is for descriptive purposes only and does not imply endorsement by the US Government...

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PDF Origin of uranium deposits revealed by their rare

The Xiangyangping uranium ore deposit is a newly discovered granite-type uranium deposit which is one of the representative granite-hosted uranium deposits in the Miaoershan uranium ore field...

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The Geology and Origin of the Rosebery Ore Deposit

The Geology and Origin of the Rosebery Ore Deposit Tasmania R L Brathwaite R L Brathwaite Search for other works by this author on GSW Strata-bound pyritic zinc-lead-copper and barite deposit volcanic-sedimentary origin comparable to kuroko deposits of Japan This content is PDF only Please click on the PDF icon to access...

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Reading Ore Genesis Geology

Ore deposits are usually classified by ore formation processes and geological setting For example SEDEX deposits literally meaning sedimentary exhalative are a class of ore deposit formed on the sea floor sedimentary by exhalation of brines into seawater exhalative causing chemical precipitation of ore minerals when the brine...

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Special Issue Sedimentary Ore Deposits Origin

Dear Colleagues This Special Issue of Minerals entitled Sedimentary Ore Deposits Origin Exploitation Paleoenvironmental Significance is dedicated to those metalliferous ore deposits that owe their origin to a combination of marine and terrestrial sedimentary processes chemical biochemical organic detrital as well as metal enrichment processes that typify the supergene...

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Mineral Ore Deposits Meaning Origin and Types Geology

An ore deposit may be either of igneous or of sedimentary origin Some deposits are related to metamorphic processes and are as such classified as deposits of metamorphic origin Within these three broad modes of origin a mineral deposit of economic value might have originated due to set of simple or complex process...

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Origin Franklin ore deposit

The origin of the zinc deposits at Franklin and Sterling Hill New Jersey is a question of great interest to the student of mineralogy and ore deposits Several excellent summaries of the geology with its numerous problems of structure petrology and metamorphism and of the mineralogy and paragenesis of the ores have appeared in recent years 1...

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Ore mining Britannica

Ore a natural aggregation of one or more minerals that can be mined processed and sold at a profit An older definition restricted usage of the word ore to metallic mineral deposits but the term has expanded in some instances to include nonmetallics Although more than 2 800 mineral species...

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Classification of ore deposits

Oct 22 2017 0183 32 The significant criteria used in these classifications were morphology or form of deposit shape size attitude origin or source of ore-bearing fluid magmatic plutonic/volcanic meteoric commodity content Cu Pb-Zn Au-Ag etc environment of formation or physical-chemical conditions temperature pressure place of deposition deep...

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Iron and Manganese Ore Deposits Mineralogy

The majority of ore deposits of both iron and manganese are of sedimentary origin At present high-grade iron ore deposits formed by hydrothermal and supergene enrichment of Proterozoic banded iron formations constitute the most important source for iron ores with only some magmatic and skarn-type iron ore deposits being mined...

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New insight into the origin of manganese oxide ore

Manganese oxide deposits have long been observed in association with carbonates within the Appalachian Mountains but their origin has remained enigmatic for well over a century Ore deposits of Mn oxides from several productive sites located in eastern Tennessee and northern ia display morphologies that include botryoidal and branching forms massive nodules breccia matrix cements...

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The Geology and Genesis of High

understanding of the origin of high-grade hematite iron ore deposits may be gained by combining available mining- orientated data with systematic petrographic-geochemical...

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New Insight Into The Origin Of Manganese Oxide Ore

Manganese oxide deposits have long been observed in association with carbonates within the Appalachian Mountains but their origin has remained enigmatic for well over a century Ore deposits of Mn oxides from several productive sites located in eastern Tennessee and northern ia display morphologies that include botryoidal...

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250 TOP MCQs on Origin of Ore Deposits and Answers

2 The definition of ore is dependent on _____ a Quantity b Size c Colour d Quality Answer b Clarification Natural concentration of an ore mineral in a massive rock body is defined as an ore deposit Hence the definition of an ore deposit is also size dependent 3 The non-metallic minerals associated with ore minerals are called _____...

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Iron processing

Iron processing - Iron processing - Ores Iron ores occur in igneous metamorphic transformed or sedimentary rocks in a variety of geologic environments Most are sedimentary but many have been changed by weathering and so their precise origin is difficult to determine The most widely distributed iron-bearing minerals are oxides and iron ores consist mainly of hematite Fe2O3 which is...

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New Jersey Mining History in Mt Hope

The 11 iron ore veins of the Mount Hope Mine outcropped 173 jutted out strongly from the ground Aiming in a northeast direction they dove deeper and deeper into the earth So men started mining in open pits on the surface then dug deeper and deeper with the ore vein One of the sub-mines went down 2 740 feet...

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PDF Introduction to Sedimentary Ore Deposits

The Nanyangtian scheelite ore deposit is a rarely-seen layered scheelite deposit in southeastern Yunnan whose ore body is hosted in the layered skarnoid of Proterozoic Nanyangtian Rock Group...

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ore Origin and meaning of ore by Online Etymology Dictionary

ORE Meaning a metalliferous mineral or rock especially one worth mining 12c a merger of Old English ora ore See definitions of ore...

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Ore Deposit

Magmatic ore deposits may be defined as rocks of igneous origin see IGNEOUS PROCESSES which can profitably be mined for their constituent chemical elementsFor example the worth of annual global production from magmatic ore deposits exceeded 10 billion in 2001 and dominates or contributes significantly to world supplies of elements representing more than a third of the periodic table...

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Classification of Ore Deposits

Table of ContentsLindgren ClassificationDeposits Produced by Mechanical Processes of ConcentrationDeposits Produced by Chemical Processes of ConcentrationIn Bodies of...

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Porphyry copper deposit

Porphyry copper deposits are copper ore bodies 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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Iron Ore Sedimentary Rock

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...

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