Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
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Six samples proved to be low-rank coals C to B (lignite), one carbonaceous shale. The lignite samples display low ash yield, low telohuminite and high detrohuminite and …
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The analyzed carbonaceous shale samples are dominated by mineral matter between 44.23% and 91.11% (Table 1). The mineral matter fraction is dominated by clay minerals as shown in the microphotographs in Figure 5. On a mineral matter-free basis, the carbonaceous shale samples have a high abundance of Figure 6.
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The AE characteristics of carbonaceous shale were investigated, a damage assessment method based on Shannon entropy of AE was further proposed. The results suggest that the mechanical properties of carbonaceous shale intensify with increasing confining pressure and degrade with increasing water content.
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Preg-robbing is an important phenomenon that inhibits gold recovery due to the presence of naturally occurring carbonaceous matter. In case of certain ores, gold recovery by cyanidation is limited by the presence of naturally occurring carbonaceous material that adsorbs gold from alkaline cyanide solution unless steps are taken to …
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northern Nigeria witnessed lead poisoning from artisanal gold mining, with an average concentration in the local river as high as 1270mg/l.
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These are commonly pyrite-bearing. At Randalls, the ore host BIF is enveloped by km-thick quartz- and feldspar-rich turbidites, with very little shale (and virtually no carbonaceous black shale). However, 10 km west of Cock-Eyed Bob is the Lucky Bay prospect, which contains abundant carbonaceous, fine-grained, and sulfidic (meta) …
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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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Carbonaceous gold ore of particle size 80% passing 212 μm obtained from one of the gold mining companies in Ghana was used for the study. The ore sample was ground to 80% passing 75 μm, homogenised and …
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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 …
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The Cretaceous sediments in the Anambra Basin (SE Nigeria) consist of a cyclic succession of coals, carbonaceous shales, silty shales and siltstones interpreted as …
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Processing of gold from refractory ores containing carbonaceous materials (CM) poses challenges due to the ability of the CM to preg-rob dissolved gold. Depending on the type and maturity of CM encountered, preg-robbing of aurocyanide ion can lead to reduction in gold recovery ranging from a few percentages to more than 50%. …
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carbonaceous matter until it is saturated and that cannot adsorb the gold in solution are used; however, this meth od is not used when there are large amounts of gold associated with carbonaceous matter. Diesel oils, kerosene and natural oils have been used, as well as cationic and anionic surfactants [22] .
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Earth Science Research; Vol. 9, No. 1; 2020 ISSN 1927-0542 E-ISSN 1927-0550 Published by Canadian Center of Science and Education 31 Assessment of Environmental Geochemistry of Lead-Zinc Mining at
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The carbonaceous shale was soaked in water for ready absorption and then dried in a thermostatic chamber. In one dry–wet cycle, the carbonaceous shale was placed in a water container to absorb water readily for 48 h and then dried in a thermostatic chamber at 105 °C for 24 h. In the experiment, the carbonaceous shale was tested …
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Artisanal and small-scale gold mining (ASGM) has long been practiced in Nigeria and around the world. Bolstered by historically high gold prices, a lack of viable alternative …
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Hydrochemical characteristics and quality assessment of groundwater from fractured Albian carbonaceous shale aquifers around Enyigba-Ameri, southeastern Nigeria Environ Monit Assess . 2019 Feb 4;191(3):125. doi: 10.1007/s10661-019-7236-3.
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The geochemical data for the Dalradian carbonaceous shales show that they are a viable protolith for Dalradian-hosted gold-tellurium mineralisation. In particular: Trace element concentrations, including Au and Te, in early-stage pyrite show that ore metal concentration began in the organic-rich sediments of the depositional environment.
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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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Coal-Waste Dump Fires of Poland. In Coal and Peat Fires: A Global Perspective, 2013. Coal-Mining Waste Disposal. In Poland, coal-mining and related activities produce coal waste comprised mainly of sandstone, siltstone, mudstone, and coal shale, with lesser quantities of conglomerate and carbonaceous rock.Mining 1 ton of sub-bituminous and …
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A Review of Geology and Coal Mining In South Eastern Nigeria: Implication for Sustainable National Development 1Abalaka, I. E. and 2 Aga, T. Department of …
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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 (hematite – reds), iron hydroxide (goethite – browns and limonite – yellow), or micaceous minerals (chlorite, biotite and illite – greens).
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To investigate the disintegration and microstructure characteristics of carbonaceous shale in high-latitude cold regions, indoor, outdoor, initial particle size, and freeze–thaw disintegration experiments were conducted concerning dry–wet cycles. Two tests were performed: sieving and microscopic scanning electron analysis. The …
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In the present work, gold‐bearing carbonaceous phyllites in the Dalma volcano‐sedimentary belt (DVSB), occupying the central region of the North Singhbhum Mobile Belt in eastern India were studied to understand the nature and mode of occurrence of gold mineralization. We propose that the protolith of the carbonaceous phyllites, that …
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Department of Geology and Mining Faculty of Applied Natural Sciences Enugu state ... grained sandstone, shale, carbonaceous shale and coal seams. In Enugu, five coal seams occur within the Mamu ... can be called fool's gold, as the colour is brass yellow with hardness 6 – 6½. It is an
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"Chapter 5: The Low-Grade, Neoproterozoic, Vein-Style, Carbonaceous Phyllite-Hosted Paracatu Gold Deposit, Minas Gerais, Brazil", Geology of the World's Major Gold Deposits and Provinces, Richard H. Sillitoe, Richard J. Goldfarb, François Robert, Stuart F. Simmons ... Successful mining of the low-grade resource was initially …
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Geological map of Baikal ore site (by E. E. Mironov, with authors' simplification) 1 -conglomerates, 2 -sandstone, 3 -siltstone, 4 -limestone, 5 -carbonaceous shale, 6 -sericitic shale, 7 -tuffite ...
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This study conducted a seepage experiment of broken shale under cyclic loading and unloading conditions to investigate the permeability characteristics of broken shale with different particle sizes under stress disturbance. There were six groups of broken shale samples with different particle sizes, and three cycles of loading and unloading …
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Southeastern Nigeria: Implications for Age and Depositional Environments ... Journal of Mining and Geology Vol. 50(2) 2014, pp. 167 - 182 ... carbonaceous shale unit which is interbedded with
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Geologically, the Enugu coal mine area is underlain by the Enugu Shale (Campanian), Mamu Formation (Lower Maestrichtian) and Ajali Sandstone (Middle Maestrichtian). Of …
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Gold was found to be mainly adsorbed onto the carbonaceous particles in the Beatrix shale material with possible minor loss of gold due to co-precipitation of gold with Mg(OH)2 and Fe(OH)3.Two ...
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