Black shale: Mineral information, data and localities.
A shale with at least 1% carbonaceous material indicating a reducing environment. A dark, thinly laminated carbonaceous shale, exceptionally rich in organic matter (5% or more carbon content) and sulfide (esp. iron sulfide, usually pyrite), and often containing unusual concentrations of certain trace elements (U, V, Cu, Ni).It is formed by partial anaerobic …
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Shale | Properties, Composition, Formation, Uses » Geology …
Black shale result presenced of greater than one percent carbonaceous material and indicates a reducing environment.Red, brown and green colors are indicative of ferric oxide ... Black carbonaceous shale which owes its color to organic matter (>5%). It is rich in sulfide minerals and contains elevated concentrations of several metals (V, U, …
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Carbonaceous Shale and Diagenesis
Carbonaceous shales are not a very strong material, and weather, for example rain or snow, can change the chemical properties. Carbonaceous shale contains silt, but clay and pyrite are also found in a good quantities. In carbonaceous shale the formation of kerogen from organic matter is first stage of diagenesis.
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Critical Metals in Black Shales | U.S. Geological …
Black shales have been of increasing interest in recent years due to their oil and gas potential, but also because many are enriched in nonfuel "unconventional" …
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(PDF) Accumulation of Trace Elements into Black Shale
These processes produce regionally extensive black shale and turbidite sequences enriched in syngenetic gold and arsenic, commonly from 5 to 100 ppb Au and 10 to 200 ppm As. Rare organic- and ...
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Chemical evolution of pyrite at the Kopylovsky and Kavkaz black shale …
The Kopylovsky and Kavkaz gold deposits in the Artemovskiy ore cluster, Bodaybo district, hosted in terrigenous carbonaceous sequence of the Dogaldyn formation of the Upper Proterozoic Bodaybo group, are localized in cores of high-order anticlines. These deposits contain gold-sulfide and gold-sulfide-quartz ore types. Pyrite is the …
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RARE-EARTH MINERALS IN CARBONACEOUS SHALE OF …
gold mineralization patterns and material constitution [11–14]. The geomechanical peculiarities of the ore-hosting black shale, carbon matter and rare-earth min-eralization were neglected. Research methods The geochemistry of carbonaceous shales was stud-ied using the microanalysis by ICP-MS spectrometry on
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black carbonaceous shale and gold mining
black carbonaceous shale and gold mining. Unconventional Resources - Petroleum Agency SA. The Frontier Geology Department is aptly named as its focus is the evaluation and promotion of South Africa's unconventional …
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black carbonaceous shale and gold mining
black carbonaceous shale and gold mining. Shale - Wikipedia. Shale is a fine-grained, clastic sedimentary rock, formed from mud that is a mix of flakes of clay minerals and tiny fragments (silt-sized particles) of other minerals, especially quartz and calcite. Shale is characterized by its tendency to split into thin layers less than one ...
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black carbonaceous shale and gold mining
black carbonaceous shale and gold mining. /time: 16:51. Geology of Uranium Deposits - World Nuclear Association ... Elements (carbon, sulfur, zinc, gold, etc.) Glossary of Mining Terms - rocksandminerals. Abutment — In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along ...
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Gold mineralization in Proterozoic black shales: …
The Proterozoic black shales rich in gold, sulfur, and organic matter, which were deposited in the Proterozoic continental margin rifts, comprised the source bed for …
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Mobility and environmental impact of cadmium (Cd
The western Hunan province is located in the middle of the so-called South-China black shale horizon (SBH) [51], of which black shales of the Lower-Cambrian represent one of the major components of the SBH (Fig. 1 a). Black shales in this area consist mainly of carbonaceous, phosphorite-bearing, stone-coal, silty, and siliceous …
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The origin of Cretaceous black shales: a change in the …
It is obvious that the oceanic setting at the time of black shale formation was anoxic; hence the expression "Oceanic Anoxic Event" was introduced to denote the events in the mid-1970s. 9) Sedimentologically, the presence of fine laminae in black shale is a smoking gun of bottom-water anoxia (Fig. (Fig.1 1). 50) Fine laminae in black shale ...
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black carbonaceous shale and gold mining
Below the jasperoid breccia are thin contorted beds of black carbonaceous shales. In one area the southeast dipping shales are cut by an altered igneous dike mostly altered to clays. The Horse Canyon deposit was discovered about 1982 and open pit gold mining commenced in 1983 employing 106 workers. Finegrained gold is disseminated
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Кey issues for improving of carbonaceous ore beneficiation …
According to the ore composition and structural features of black-shale blocks, the studied subjects are associated with big large-volume gold deposits belonging to black-shale formation: 1) dispersed, finely disseminated condition of noble metal mineralization; 2) presence of carbonaceous matter in ore-bearing rocks; 3) presence of …
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Geochemistry of soils derived from black shales in the
The geochemistry of major and trace elements (including heavy metals and rare earth elements) of the fresh and weathered black shales, and the soils derived from black shales in the Ganziping mine area in western Hunan province (China) were studied using the following techniques: X-ray fluorescence (XRF), inductively coupled plasma …
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Cu isotopes and concentrations during weathering of black shale …
To understand black shale weathering, a geochemical survey was initiated for soils developed on shales of the Marcellus Formation at a zero-order catchment at a satellite site of the Susquehanna/Shale Hills Critical Zone Observatory located in Jackson Corner, Pennsylvania. ... This formation is an organic- and metal-rich, carbonaceous shale ...
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Environmental impact of mineralised black shales
Abstract. Black shales are sedimentary rocks containing >0.5% of organic carbon. They host polymetallic deposits which have been mined for Cu, Ni, Zn, Mn, P, …
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Spontaneous combustion of carbonaceous shale at an iron …
In 2020, a premature detonation incident occurred at an iron ore mine where the waste material contains black carbonaceous shale units known to be associated with pyrite. The spontaneous combustion propensity and properties of samples of the black carbonaceous shales from the mine were examined and compared with samples from the Witbank …
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The characteristics and formation of black shale …
Auriferous deposits located in black shale are among the most attractive long-term targets for gold exploration. Black shale-type gold deposits are hosted in a wide range of …
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Geochemical and mineralogical evaluations of coal, shale
2.2 Analytical characterization 2.2.1 Sampling program. Using Standard method (ASTM 2010), coal samples were collected from one of the largest coal mines in the Makum coalfield.The rock types were mainly sandstone, shale, and carbonaceous clay. Several coal, MOB, and shale samples were gathered from three distinct sites (shown in …
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Multi-stage metal enrichment and formation of gold …
Black shales, marine siliciclastic rocks with > 1 wt% of total organic carbon (TOC) content, may serve as an important source of metal accumulations, notably redox …
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(PDF) Rare-earth minerals in carbonaceous shale of the Kumak gold
Black-shale deposits of the Kumak ore field according to the parameter Na2O/K2O = 0.62 belong to the normal potassium formation type, which is typical for deposits with mainly gold-sulfide ...
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Black Horse Group Mine – Western Mining History
black horse tungsten vein was mined for scheelite to a depth of 100 ft, and explored to a depth of 200 ft. comment (geology): ore in two quartz-calcite veins along bedding faults ore in two quartz-calcite veins along bedding faults. limestone, shale, carbonaceous shale and carbonaceous limestone; striking e, dip n.
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Organic carbon cycling and black shale deposition: an Earth …
INTRODUCTION. Earth's surface can be divided into four 'spheres': the lithosphere, biosphere, atmosphere and hydrosphere. The cycling of organic carbon produced by organisms in the atmosphere, oceans, land and mantle reservoirs is a particular characteristic of Earth [1, 2] (Fig. 1).The 'Gaia hypothesis' proposed by …
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black carbonaceous shale and gold mining
According to the ore composition and structural features of black-shale blocks, the studied subjects are associated with big large-volume gold deposits belonging to black-shale formation: 1) dispersed, finely disseminated condition of noble metal mineralization; 2) presence of carbonaceous matter in ore-bearing rocks; 3) presence of native ...
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Кey issues for improving of carbonaceous ore …
According to the ore composition and structural features of black-shale blocks, the studied subjects are associated with big large-volume gold deposits …
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(PDF) Spontaneous combustion of carbonaceous shale at an …
Abstract and Figures. Spontaneous combustion during coal mining operations is a major problem that affects the health and safety of workers and causes environmental problems. The phenomenon is ...
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[PDF] Multistage sedimentary and metamorphic origin of pyrite and gold
Gold mineralization at Sukhoi Log in eastern Siberia is hosted in a deformed Neoproterozoic organic-bearing and pyritic black shale and siltstone sequence that is folded into a tight overturned anticline. The deposit contains about 30 million ounces of gold at an average grade of 2.0 g/t Au and is one of the largest known undeveloped gold …
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Gold mineralization in Proterozoic black shales: Example …
The Haoyaoerhudong gold deposit in the northern margin of the North China Craton (NCC) is a large tonnage lower-grade deposit with a reserve of about 148 tons of gold. Gold mineralization is characterized by pyrite and pyrrhotite films and thin veins on the schistosity plane of the Proterozoic black shales.The orebodies, strictly controlled by …
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