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gold inside sedimentary rocks

Rio Suerte Gold occurs very commonly in igneous rocks and in fact it can be said that all igneous rocks have gold grains but very thin does not mean that gold is formed there but staying there as a result of erosion of metamorphic or sedimentary The gold present in the magma comes from igneous rocks which upon cooling form new rocks gold mining companies images south africa

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  • gold inside sedimentary rocks

    Geodes in sedimentary rocks are usually found in limestones dolomites and calcareous shale In these deposits a gasfilled void can serve as the opening for geode formation Shells tree branches roots and other organic materials often decay away to leave a void for the formation of mineral materials

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  • gold inside sedimentary rocks

    sedimentary rockhosted gold deposits These are 1 shortaxial anticlines 2 stratabound breccia bodies 3 unconformity surfaces and 4 joints associated with faults and anticlines Shear zones with ductilebrittle deformation textures of ore and rocks also are observed in some Chinese sedimentary rockhosted gold deposits figs 23 and 24

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  • gold inside sedimentary rocks

    Apr 23 2013 · Re The occurence of gold in sandstones and shale If those are gold particles there should be gold that weathered out of the rock and into the nearest waterway forming a nice little placer Plenty of things to check out Your overall idea is a valid one as the big mines in South Africa are old placers that became sandstone

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  • gold inside sedimentary rocks

    Sometimes the gold is in a finely divided state sometimes in particles of considerable size as nuggets grains scales plates threads and wires in quartz rock It occurs also in a finely divided state disseminated through schistose rocks slates and some sedimentary rocks like limestone

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  • gold inside sedimentary rocks

    The Mineral gold The color of pure Gold is bright golden yellow but the greater the silver content the whiter its color is Much of the gold mined is actually from gold ore rather then actual Gold specimens The ore is often brown ironstained rock or massive white

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  • gold inside sedimentary rocks

    Sedimentary rock Allochemical sedimentary rocks such as many limestones and cherts consist of solid precipitated nondetrital fragments allochems that undergo a brief history of transport and abrasion prior to deposition as nonterrigenous clasts Examples are calcareous or siliceous shell fragments and oöids

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  • gold inside sedimentary rocks

    May 25 2019 · Purple rocks which may range in hue from blue to violet get their color from the minerals those rocks contain Although fairly rare you can find purple blue or violet minerals in these four types of rocks ordered from most to least common To properly identify your blue violet or purple mineral you first need to inspect it in good light

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  • gold inside sedimentary rocks

    Sedimentary rocks are formed from eroded fragments of other rocks or even from the remains of plants or animals The fragments accumulate in lowlying areaslakes oceans and desertsand then

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  • gold inside sedimentary rocks

    Ironrich sedimentary rocks are sedimentary rocks which contain 15 or more r most sedimentary rocks contain iron in varying degrees The majority of these rocks were deposited during specific geologic time periods The Precambrian 3800 to 570 million years ago the early Paleozoic 570 to 410 million years ago and the middle to late Mesozoic 205 to 66 million years ago

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  • gold inside sedimentary rocks

    Gold is an elemental mineral and not considered a rock Gold could be found in sedimentary igneous and metamorphic rocks

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  • gold inside sedimentary rocks

    One widely accepted hypothesis proposes that many gold deposits especially those found in volcanic and sedimentary rocks formed from circulating ground waters driven by heat from bodies of magma molten rock intruded into the Earth’s crust within about 2 to 5 miles of the surface

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  • gold inside sedimentary rocks

    Mar 13 2018 · Take a rock that contains gold in it – this process works best on quartz rocks – and set it inside a glass jar Add white cooking vinegar to the jar covering the entire rock and then some with the vinegar The acidbased vinegar slowly dissolves the quartz crystals surrounding the gold leaving only bits of quartz attached to the gold

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  • gold inside sedimentary rocks

    Apr 23 2013 · If shale or slate carries carbon and some igneous activity under it should cause it to fracture and allow quartz veins to develop within it the carbon has been known to help gold carried in the quartz to precipitate into visible bodies I dont think limonite appearing out of weathering sedimentary rock has any bearing on gold deposition

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  • gold inside sedimentary rocks

    Dec 28 2015 · Economic Significance of Igneous Rocks The minerals of great economic value found in igneous rocks are magnetic iron nickel copper lead zinc chromite manganese gold diamond and platinum Amygdales are almondshaped bubbles formed

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  • gold inside sedimentary rocks

    Ores are rocks that include minerals that have important elements such as metals like gold and silver Sedimentary rocks form layers at the bottoms of oceans and lakes Marble is a metamorphic rock formed when limestone is exposed to high heat and pressure within

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  • gold inside sedimentary rocks

    Sedimentary rock Allochemical sedimentary rocks such as many limestones and cherts consist of solid precipitated nondetrital fragments allochems that undergo a brief history of transport and abrasion prior to deposition as nonterrigenous clasts Examples are calcareous or siliceous shell fragments and oöids

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  • gold inside sedimentary rocks

    Ironrich sedimentary rocks are sedimentary rocks which contain 15 or more iron However most sedimentary rocks contain iron in varying degrees The majority of these rocks were deposited during specific geologic time periods The Precambrian the early Paleozoic and the middle to late Mesozoic Overall they make up a very small portion of the total sedimentary record Ironrich sedimentary rocks

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  • gold inside sedimentary rocks

    Sedimentary rocks are formed from eroded fragments of other rocks or even from the remains of plants or animals The fragments accumulate in lowlying areaslakes oceans and desertsand then are compressed back into rock by the weight of overlying materials

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  • gold inside sedimentary rocks

    Sedimentary rocks are formed by the accumulation of other eroded substances while Metamorphic rocks are formed when rocks change their original shape and form due to intense heat or pressure s rocks are commonly found inside the Earth’s crust or mantle while Sedimentary rocks are usually found in water bodies sea oceans etc

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  • gold inside sedimentary rocks

    A sedimentary geode is an openable item that can sometimes be obtained when mining copper tin iron coal mithril adamantite luminite or runite rocks Sedimentary geode From the RuneScape Wiki the wiki for all things RuneScape

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  • gold inside sedimentary rocks

    In many gold mines exploited during the gold rushes of the 19th century vein material alone was typically sought as ore material In most of todays mines ore material is primarily composed of the veins and some component of the wall rocks which surrounds the veins

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  • gold inside sedimentary rocks

    All kinds of rocks become sediment Sediment is sand silt or clay As the sediment is buried it is compressed and material dissolved in water cements it together to make it into sedimentary rock If a great amount of pressure is exerted on the sedimentary rock or it is heated it may turn into a metamorphic rock

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  • gold inside sedimentary rocks

    The majority of the worlds productive gold deposits especially those found in volcanic and sedimentary rocks formed from circulating ground waters driven by heat provided by bodies of magma molten rock intruded into the Earths crust within about 2 miles of the earths surface

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  • gold inside sedimentary rocks

    The Geology Of Gold Gold is relatively scarce in the earth but it occurs in many different kinds of rocks and in many different geological environments Though scarce gold is concentrated by geologic processes to form commercial deposits of two principal types lode primary deposits and placer secondary deposits

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  • gold inside sedimentary rocks

    Mar 13 2018 · Take a rock that contains gold in it – this process works best on quartz rocks – and set it inside a glass jar Add white cooking vinegar to the jar covering the entire rock and then some with the vinegar The acidbased vinegar slowly dissolves the quartz crystals surrounding the gold leaving only bits of quartz attached to the gold

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  • gold inside sedimentary rocks

    Veins and reefs of goldbearing quartz can occur in many types of rock for example around granites in volcanic rocks or in regions of black slate but in most cases these host rocks are not the immediate source of the gold Gold deposits have formed at many different times during Earth’s history

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  • gold inside sedimentary rocks

    Brassy yellow pyrite often called “fool’s gold” occurs variously as an accessory mineral in many rocks in veins and even as a chief component of some fossils Pyrrhotite which mineral Sulfides

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  • gold inside sedimentary rocks

    The word “geology” in the same dictionary is defined as “The features of the earth’s crust in a place or region rocks or rock formations of a particular area” So in putting these two words together we have “placer geology” as the nature and features of the formation of deposits of gold and other valuable minerals within a streambed

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  • gold inside sedimentary rocks

    Igneous rocks are created from solidified magma rock that has been melted inside the earth sedimentary rocks are created when smaller bits of rock or sand are cemented together and metamorphic rock are formed when other types of rocks are subjected to heat and pressure

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  • gold inside sedimentary rocks

    GRANITE is a coarse to medium grained rock that forms from the cooling of magma deep within the Earth intrusive It is made up mainly of varying amounts of the minerals quartz orthoclase muscovite biotite and hornblende granum for “grains”

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  • gold inside sedimentary rocks

    Rock Type sedimentary Composition grains of sand that can be feldspar or quartz the amount of other minerals such as mica depend on how much weathering has occurred Environment Already existing rocks are eroded and the grains are transported and sorted by rivers The resulting sand is deposited on beaches along floodplains or in deltas where it is eventually buried by other sediments

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  • gold inside sedimentary rocks

    A disconformity is an a erosional surface between horizontal layers of sedimentary rocks b erosional surface between igneous and sedimentary rocks c rock unit that does not contain fossils d rock unit that is different from the units above or below it

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  • gold inside sedimentary rocks

    Sedimentary rocks are formed by the accumulation of other eroded substances while Metamorphic rocks are formed when rocks change their original shape and form due to intense heat or pressure s rocks are commonly found inside the Earth’s crust or mantle while Sedimentary rocks are usually found in water bodies sea oceans etc

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  • gold inside sedimentary rocks

    A rock consisting of individual clasts within a finergrained matrix that have become cemented together they are sedimentary rocks consisting of rounded fragments arkose a detrital sedimentary rock specifically a type of sandstone containing at least 25 feldspar

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  • gold inside sedimentary rocks

    Aug 02 2019 · Pick up the rock and assess its weight If the rock feels lighter than that surrounding rocks it may be a geode Geodes have a hollow space inside which is what allows the crystals to form You can also shake the rock next to your ear to test whether it is hollow You may hear small pieces of rock or crystal rattling around inside if it is

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  • gold inside sedimentary rocks

    All kinds of rocks become sediment Sediment is sand silt or clay As the sediment is buried it is compressed and material dissolved in water cements it together to make it into sedimentary rock If a great amount of pressure is exerted on the sedimentary rock or it is heated it may turn into a metamorphic rock

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  • gold inside sedimentary rocks

    The types of rocks that contain oil and natural gas are all sedimentary rocks rocks formed when grains and mineral particles deposited by running water fuse together Because these rocks are cemented together from such small components they are porous full of spaces in which energyrich carbon compounds can settle

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