where is hornblendite mined

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Field trip 5

chromitite fig 5 Hornblendite is the latest intrusive rock forming numerous dykes cutting all ultramafites and metasomatically transform them in the contact zones Dunite and PGM rich chromitite are the source of the famous platinum placers are situated along the Is river Few hundreds of platinum nuggets in between 100 g several kilograms were mined out from this placer in the past

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Amphibolite Metamorphic Rock

Amphibolite is a coarse grained metamorphic rock that is composed mainly of green brown or black amphibole minerals and plagioclase feldspar The amphiboles are usually members of the hornblende group It can also contain minor amounts of other metamorphic minerals such as biotite epidote garnet wollastonite andalusite staurolite

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Why do mineral names end in ITE

Answer 1 of 3 Both Victor s answer and Stuart s are really finebut here s the plain and honest truth sort of cue music TRADITION When mineralogists FIRST started looking at the composition of minerals with that new fangled chemistry thing they made some assumptions about how mine

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All about skarns

02.11.2007  They are mined for ores of zinc lead and silver although zinc is usually dominant They are also high grade 10 20 Zn Pb 30 300 g/t Ag Related igneous rocks span a wide range of compositions from diorite through high silica granite They also span diverse geological environments from deep seated batholiths to shallow dike sill complexes to surface volcanic extrusions The

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LINECUTTING GRID ESTABLISHMENT AND SOIL SAMPLE

that are found at the Pacific Nickel Mine property within 300 to 500 metres of mined ore pods Initial exploration work revealed new areas of ultramafic rocks pyroxenite hornblendite with disseminated pyrrhotite pyrite and chalcopyrite Distinctive faulting features were noted along with alteration in the form of serpentinization and uralitization As well mineralization discovered to

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Igneous rock types

Hornblendite a plutonic rock composed mostly of hornblende Lherzolite a plutonic rock composed largely of olivine along with lesser clinopyroxene and orthopyroxene and sometimes spinel Orthopyroxenite a plutonic rock composed mostly of orthopyroxene Peridotite a plutonic rock composed of olivine with lesser pyroxene and/or amphibole Pyroxenite a plutonic rock composed largely of

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Ultramafic rock

Ultramafic rocks also referred to as ultrabasic rocks although the terms are not wholly equivalent are igneous and meta igneous rocks with a very low silica content less than 45 generally >18 MgO high FeO low potassium and are composed of usually greater than 90 mafic minerals dark colored high magnesium and iron content The Earth s mantle is composed of ultramafic rocks.

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EXCESS RADIOGENIC ARGON IN PYROXENES AND ISOTOPIC

mined in triplicate the spread in the measured K contents was 2 per cent Only a single analysis was made on each of the other pyroxe­ nes The K blank for this method is about 5 tg and as the K concen­ trations are as low as 20 tg/g the blank correction is very significant At this low level the accuracy is probably about ± 5 per cent How­ ever because of the exponential nature of

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ALEX STREKEISEN Eurite

Alex StrekeisenI vetrini della mia fantasia Eurite Eurite Name originally suggested by d Aubuisson for a compact felsitic rock and later extended to cover all aphanitic rocks of granitic composition om the Greek eurys = broad Elba island Eurite The La Crocetta deposit is located in the Eastern portion of Elba island which lies in the Northern Tyrrhenian Sea between the Corsica Island

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Pyroxene Group

Hornblendite is a rare plutonic rock composed of amphibole hornblende Serpentinite is composed of one or more serpentine group minerals formed by hydration and low temperature metamorphic transformation of ultramafic rocks Serpentinization is a good indicator in mineral exploration for platinum–nickel–chromium mineralization.

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Golden Wonder Mine Eighty Five claim 85 Mine Oxbow

It is hosted in hornblendite The gold quartz vein less than 2 feet wide Mineralized stringers are common An associated rock unit is granite Workings are an average of 4 feet wide Open pit mined in the 1970 s with minor unreported gold production No production record.

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Nunavut

The hornblendite is bounded on either side by amphibolite which in turn is bounded by hornblende gneiss to the north and south The entire sequence is folded in northeast trending folds and is repeated to north and south A syenite intrusion is located just to the northeast of the deposit Starfield embarked on two phases of exploration in 2000 During the winter and spring 5000 metres of

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Examples of Plutonic Rocks

04.10.2016  Amphibolite or hornblendite consists mostly of hornblende Gabbro Gabbro is coarse to medium grained dark colored rock composed of pyroxene and basic feldspar mostly labradorite The pyroxene usually predominates and is partly of the variety called diallage partly augite The crystals of pyroxene and feldspar are broad in outline Contains 40 to 50 of silica Norite Norite has the

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Geological and geochemical investigation of the Kraubath

pyroxene hornblendite 247 3 During the third postmagmatic stage there follows serpentini zation with partial mobilization of magnesium SiO Al O FeO CaO and Cr are not mobilized Serpentinization was autometasomaticmetasomatic under conditions of retrograde métamorphism and proceeded from geological structures All stages of serpentine formation can be observed The H 0

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tic and the latter is intruded by the melanocratic gabbro and hornblendite which sometimes changes to chlorite schist or hornblende schist 143 144 KOREA AND MANCHURIA The leucocratic gabbro sometimes shows gneissose structure and is exposed in a large area It usually consists of a small amount of pyroxenes and hornblende with smaller amount of magnetite ilmenite chlorite apatite

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Historical Mining Claim Maps

Historical Mining Claim Maps Before Claim Maps were available online in which current and active claims may be viewed claims were drawn on linen paper and later Mylar sheets Despite their age there continues to be interest in the information provided by these historical mining claim maps Recently the maps were scanned and saved as

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SIGNIFICANT MINERALISATION FROM MULTIPLE PROSPECTS AT

mined in the 1910s and explored by Western Mining Corporation WMC in the 1950s In 2019 Dreadnought drilled two diamond holes into Grant s Find to determine the tenor of copper and gold mineralisation in fresh rock as WMC had not previously assayed for gold in their drilling Despite intersecting encouraging copper mineralisation including 1.7m 3.8 Cu and 0.5 g/t Au the overall

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Ultramafic High Resolution Stock Photography and Images

Hornblendite ultramafic monomineralic igneous hornblende rock Pyroxenite especially kimberlite breccias and in detrital sedimentary deposits Large crystals are mined for use as gemstones Small crystals are used as an industrial abrasive Most diamond is colourless but some forms may have yellow brown grey or green tints Most forms are fluorescent in ultraviolet light Splendid

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OPAP 1992 RPT PROJ NUMBER OP92 481

dominantly pyroxenite and hornblendite intrude the metasediments the metasediments strike northeast and dip from 50 degrees to 65 degrees northwest page 4 local geology the showing consist of an intrusive mass of proxenite 80 ft wide and up to 400 long tapering off gradually to the east the surrounding rocks consist of metasediment with no clearly defined strike or dip mineralization this

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The Layered Mafic Ultramafic Complexes of the Tocantins

1999 those that are mined primarily because of their contained Ni and Cu and those mined primarily because of their PGE content While the first group encompasses several deposits formed at distinct environments including volcanic associated deposits deposits located at the base or at feeder conduits of layered intrusions and deposits associated to extra terrestrial impact world class

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phic zone is broad and extends at least

hornblendite occurs as dikelike bodies in the gneiss and coarsely crystalline pure to silicated marble layers are inter calated with the gneisses Small bodies of dunite also occur locally in the gneiss Detailed structure of the metasedi mentary rocks cannot easily be deter mined because the extent of the expo sures is limited by the overlying basalt and talus from that basalt However

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Cunliffe B

Another Breton axe type this time a shaft hole axe made of hornblendite from quarries at Pleuven Quimper shows a very similar distribution pattern though the actual number of specimens is fewer Giot Cogne 1955 Since the axes are likely to have passed from hand to hand as valued items within systems of gift exchange the distribution patterns reflect the social networks which

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Characterization and testing of rock aggregates of the

As amostras foram classificadas como hornblendite gabro cuarzomonzodiorita monzodiorita e monzonite cuarzomonzodiorita sendo o grupo dominante Os valores dos pesos específicos indicados na gama 2673 2956kg/m3 Os valores de absorção de água estão na gama de 0 908 1 194 Os valores de impacto de Agregados as amostras 37 82 61 36 mostrou uma boa solidez a apenas um dos

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Tectonic implications of the discovery of a Shawinigan

While amphibolitic lithologies dominate hornblendic schists hornblendite and coarser grained metagabbroic variants also occur These belts are structurally complex highly disrupted and intruded by granitic to tonalitic rocks of the Antwerp Rossie Hermon granitic gneiss Hyde School Gneiss and AMCG suites These crosscutting relationships indicate they are at least 1200 Ma old but

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Current Research Samuels Lake intrusion a Late Archean Cu

hornblendite MacTavish 1992 inasimilarconfigurationto that at Samuels Lake Monzodiorite/diorite This is a relatively minor phase consisting of approximately 30 cm wide dikes and an inclusion rich plug both of which were observed to cut the hornblendite phase It is therefore interpreted to be the youngest igneous phase This phase is

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ALEX STREKEISEN Topaz

Alex StrekeisenI vetrini della mia fantasia TopazAl 2 SiO 4 F OH 2 The name topaz is usually derived via Old French topace and Latin topazus from the Greek topazios the ancient name of Zeberget Island Topasos in the Red Sea from which a yellow stone now believed to be olivine was mined in ancient times.

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Prairie Rose Publications Gorilla Gold Mine

20.02.2017  Mineralization is hosted in hornblendite and granite Gold was the only valuable mineral mined Approximate location of Gorilla Mine Trees in meadow of former Wasson town site I interrupt this blog post for a tale of serendipity During my internet search

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The giant mascot ultramafite and its related ores

The Giant Mascot Ultramafite is on the southeastern flank of the Coast Crystall ine Belt 100 miles east of Vancouver B.C It is roughly elliptical 1 x 2 mi crudely zoned ranging from peridotite through pyroxenite and horn blende pyroxenite to marginal hornblendite It is enclosed in dioritic rocks of the Spuzzum Intrusions Twenty eight pipe like orebodies within the ultramafite have

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The Layered Mafic Ultramafic Complexes of the Tocantins

1999 those that are mined primarily because of their contained Ni and Cu and those mined primarily because of their PGE content While the first group encompasses several deposits formed at distinct environments including volcanic associated deposits deposits located at the base or at feeder conduits of layered intrusions and deposits associated to extra terrestrial impact world class

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New Mexico Geological Society

rocks are hornblendite and serpentinized peridotite 1630.2±1.9 Ma 40ar/39ar Strickland et al 2003 and a metarhyolite with TaBLe 1 Reported metals production from the Zuni Mountains mining district Cibola County from U.S Geological Survey 1902 1927 U.S Bureau of Mines 1927 1990 McLemore 1989 NMBGMR file data Production data can change as better data are obtained no

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Scaling Law of Quasi Brittle Fragmentation

01.01.2014  The examined syminal samples disks with diameter of 80mm and height of 33 and 100mm were prepared from hornblendite mined in the Urals Ignatova 2013 Fragmentation tests were performed under hypervelocity impact loading using the Railgun described by Fortov et al 2006 The projectile velocities were 2650 and 3000m/s The fragment size distribution of syminal samples

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The Geology of the San Juan Islands Igneous Rocks

28.03.2006  The latter have been mined to some extent on Cypress Island in spite of the fact that each ore body usually contains only a few tons of chromite At the southeast corner of Cypress Island a cone shaped hill called Olivine Hill rising to an elevation of 600 feet is composed almost entirely of fresh vitreous olivine Individual crystals of the olivine measure up to two inches in length A

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Grand National Mining Company Mine Tangle Blue Mine

Mineralization is hosted in granodiorite hornblendite and diorite The ore body dips 90 vertically at a thickness of 1.22 meters Ore controls included shearing planes in the host rock Hanging wall in the drift to the N of the main adit is a shear zone formed by hornblende diorite Local rocks include Mesozoic granitic rocks unit 5 Klamath Mountains Workings include underground

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mogok5

At this time most of the pockets have been mined out due to intense mining in the area so most of the sapphires are found in the alluvial Yet Thurein Taung still produces significant amounts of blue sapphires often in large and fine quality crystals c Lay thar apya taw This mine is located at NE of Bernard myo near Mogok Momeik border at 23° 00 23.5 N and 96° 29 18.3 E about

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Geologic units in South Carolina state in United States

Carbonate facies are locally mined in western Georgia for agricultural lime Waccamaw Formation Pleistocene at surface covers 5 of this area Another Carolina costalized terrace of early middle Pleistocene age Deeply weathered Peedee FormationBlack Creek Group undivided Cretaceous at surface covers 5 of this area Peedee FormationBlack Creek Group undivided Persimmon Fork

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Diopsidites from a Neoproterozoic–Cambrian suture in

2 Geological setting Southern India occupies a central position in the Late Neoproterozoic–Cambrian Gondwana supercontinent assembly Santosh Maruyama Yamamoto Reference Santosh Maruyama and Yamamoto 2009 .The boundary between the Archaean Dharwar Craton in the north and the Neoproterozoic Southern Granulite Terrane in the south is marked by the Palghat Cauvery Suture

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