Pyrite and Pyrrhotite Textures and Composition in

The various types textures and compositional zoning of pyrite in the gold bearing saddle reefs quartz veins and surrounding sedimentary rocks provide new information on the potential source and timing of gold and arsenic and related fluid processes responsible for mineralization at Bendigo

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Marin Mineral Company Pyrite Collection

The Pyrite crystals are Gold bearing According to articles on the deposit 'The ore bodies at this mine were formed by extensive hydrothermal alteration and mineralization of fractured metavolcanic and metasedimentary rocks within the shear zones of two principal quartz veins; the Bull vein and Calaveras vein

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Why some early formed hydrothermal pyrites contain high

Although Ni and Co contents of pyrite in gold bearing Qtz veins are lower than the pyrite in the altered rocks their Co/Ni ratios may be similar if so it suggests that these pyrite may have

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Pyroxmangite (`rhodonite') from Colorado

The ores were deposited in six stages 1) pyrite quartz ore 2) banded quartz sulphide ore 3) massive galena sphalerite chalcopyrite bornite hematite ore 4) Au Te quartz ore 5) Mn ores and 6) quartz fluorite carbonate sulphate or Casadevall (1976) considered that falling temperature was the prime cause of metal deposition

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AME 656 Quartz & Pyrite | Below BC

Gold bearing quartz veins were noted and developed from the 1870s onwards on several claims owned by the mine including the Cariboo claim and later the Pinkerton and Rainbow claims The Cariboo Gold Quartz Mining Co Ltd was founded in 1927 by prospector Fred M

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Precious metals (gold and silver) mineral resources

Mesothermal quartz vein hosted gold Gold occurs in quartz veins ranging from a few mm to several metres in width and is often associated with pyrite and base metals The veins were formed by high temperature mineralising fluids which filled space created by tectonism

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some pyrite quartz gold ore Colorado YouTube

Nov 19 2017· finding an old gold mine just above where i live in The SAngre De cristo Mtns

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Gold pyrite quartz hydrothermal vein (Central City Mining

Jul 29 2007· Gold pyrite quartz hydrothermal vein from Colorado USA (public display Leadville Mining Museum Leadville Colorado USA) This is a gold ore sample from Colorado's Central City Mining District The whitish gray material is quartz (SiO2

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What is Gold Quartz? 5th Avenue Jewelers

The quartz comes in various colors and sometimes contains other minerals Pearl white is considered the most desirable and is used in our jewelry When the quartz contains a rare gold dispersion an exquisite piece of jewelry can be created The quartz rocks are cut into slabs to expose the veins These slabs are then hand cut and polished into

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AME 656 Quartz & Pyrite | Below BC

Gold bearing quartz veins were noted and developed from the 1870s onwards on several claims owned by the mine including the Cariboo claim and later the Pinkerton and Rainbow claims The Cariboo Gold Quartz Mining Co Ltd was founded in 1927 by prospector Fred M

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The Colorado Quartz Mine Mariposa County California

The Colorado vein strikes to the northwest and dips to the northeast somewhat less steeply than the parallel Colorado dike The productive quartz veins in the Colorado Quartz mine have been referred to as floor veins a carryover from similar veins in other pocket mines where miners commonly use the shallowly dipping veins as the floor for

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Learn About the Many Varieties of Quartz

Jun 22 2019· Prospectors are always alert to veins of quartz because these are signs of hydrothermal activity and the possibility of ore deposits To the geologist the amount of silica in a rock is a basic and important bit of geochemical knowledge Quartz is a ready sign of high silica for example in rhyolite lava

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Pyroxmangite (`rhodonite') from Colorado

The ores were deposited in six stages 1) pyrite quartz ore 2) banded quartz sulphide ore 3) massive galena sphalerite chalcopyrite bornite hematite ore 4) Au Te quartz ore 5) Mn ores and 6) quartz fluorite carbonate sulphate or Casadevall (1976) considered that falling temperature was the prime cause of metal deposition

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Commodore Mine Amethyst vein Creede Mining District

Quartz (Var Amethyst) Hematite Pyrite Commodore Mine Amethyst vein Creede Mining District Mineral Co Colorado USA Colorado of tiny amethyst quartz crystal nicely interspersed with VERY GEMMY yellow green to lustrous black sphalerite crystals The two protruding "horns" of gem and black sphalerite really add character to this

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Caribou area Colorado

Pyrite Quartz veins contain pyrite and other metal sulfide minerals including chalcopyrite galena and argentite Quartz Quartz veins contain several metal sulfide minerals including argentite chalcopyrite galena and pyrite Also found in the quartz is gold and wire silver Home >Colorado Rockhounding >Front Range >Boulder Co

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GALENA PYRITE QUARTZ 3" x 3" Celestial Earth Minerals

It has a Mohs hardness of 60 65 no cleavage and a specific gravity of 49 52 Crystals are striated opaque and have a pale brass yellow color that tarnishes to brown Pyrite occurs in all mineralogical environments; the best crystals develop in hydrothermal veins in association with quartz sphalerite and galena

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Pyrite Wikipedia

Pyrite is usually found associated with other sulfides or oxides in quartz veins sedimentary rock and metamorphic rock as well as in coal beds and as a replacement mineral in fossils but has also been identified in the sclerites of scaly foot gastropods Despite being nicknamed fool's gold pyrite is sometimes found in association with small quantities of gold

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Mineral Classics Colorado Minerals!

Quartz Locality Vein Outcrop Dawn of Day (Sunshine) Mine Cement Creek Red Mountain District San Juan County Colorado Specimen Size 103 x 77 x 28 cm (cabinet) A beautifully crystallized specimen of Quartz from the lesser known Dawn of Day mine in San Juan County

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Economic Geology of the Idaho Springs District Clear Creek

as pyrite veins pyritic copper veins pyritic lead zinc veins and lead zinc veins Pyrite veins (composed largely of pyrite and quartz) are valued only for their gold content which is low grade; few veins have been mined profitably The veins have indistinct walls and show evidence of

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Gold silver telluride ores Colorado USA I

2520 is a thin slice composed mainly of white strained prismatic vein quartz margins rimmed by granular galena and pale sphalerite the vein interior containing equant blebs or granules of galena chalcopyrite and pyrite

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Gold silver telluride ores Colorado USA I

2520 is a thin slice composed mainly of white strained prismatic vein quartz margins rimmed by granular galena and pale sphalerite the vein interior containing equant blebs or granules of galena chalcopyrite and pyrite

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Chalcopyrite

The source material of chalcopyrite comes from magma but it often crystallizes outside of the magma body with other ore minerals and of course quartz which forms the backbone of these mineral veins Chalcopyrite and quartz precipitated from hot aqueous (hydrothermal) solution Width of sample 12 cm

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Marin Mineral Company Pyrite Collection

The Pyrite crystals are Gold bearing According to articles on the deposit 'The ore bodies at this mine were formed by extensive hydrothermal alteration and mineralization of fractured metavolcanic and metasedimentary rocks within the shear zones of two principal quartz veins; the Bull vein and Calaveras vein

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Mineralized veins and breccias of the Cripple Creek

The Cripple Creek district has yielded nearly 21 million troy ounces of gold since its discovery in 1891 The orebodies occur as narrow veins within Precambrian and Tertiary rocks and as bulk tonnage deposits within tectonic and hydrothermal brecciasThe district is localized within and adjacent to a 279 to 293 + or 07 my old nested diatreme intrusive complex

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