considerably between mining and non-mining areas with mining area being extremely enriched with Pb, Zn and Cd, and significantly enriched with Co, Cu, Ni and Fe. Non- mining areas are minimally enriched with all investigated metals. The soils around the mines are polluted with Pb and Cd, where both metals also pose
An oil shale deposit, possibly of high economic value and corresponding to the Turonian Ezeaku shale (lower Nkalagu formation) of the Lower Benue Trough, was found in a 1.5 × 1.0 km belt in Lokpanta near Okigwe, in Imo State, Nigeria. ... The most appropriate depositional setting for this highly carbonaceous shale seems to be …
This assessment examines the legal and policy challenges underpinning the informal artisanal and small-scale gold mining (ASGM) sector in Nigeria. The assessment presents legal, institutional, and financial recommendations designed to improve long-term health and environmental outcomes from the ASGM process. These recommendations are …
Cyanidation, a conventional process to extract gold from gold ores, has been used for over 130 years in industrial mining because of the high efficiency and rate of formation of Au(CN) 2 − and the high recovery efficiency by adsorption of Au(CN) 2 − on activated carbon. However, carbonaceous refractory gold ores are not targeted …
According to the ore composition and structural features of black-shale blocks, the studied subjects are associated with big large-volume gold deposits …
Mining activities have long been recognized as a major source of environmental contamination associated with heavy metals and metalloids. This study evaluated the relationship between the occurrence and mining of lead-zinc sulphide ores at Ishiagu, Nigeria, and heavy metal and metalloid contamination.
ORIGINAL PAPER Geochemical evaluation of the carbonaceous shale of the upper cretaceous Anambra Basin for potential gas generation, Nigeria George Oluwole Akintola1 & Phillips Reuben Ikhane2 & Francis Amponsah-Dacosta1 & Ayoade Festus Adeagbo3 & Sphiwe Emmanuel Mhlongo1 & Joshua Nosa Edokpayi4 & Vincent Olajide Oladipo2 & …
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 …
Request PDF | Hydrochemical characteristics and quality assessment of groundwater from fractured Albian carbonaceous shale aquifers around Enyigba-Ameri, southeastern Nigeria | Enyigba-Ameri area ...
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 …
The relatively low average Fig. 7 Source shale extracts of Pristane/n-C17 alkane (Pr/n-C17) against phytane/n-C18 alkane (Ph/n-C18) after (Mißbach et al. 2016) Conclusions The major oxide ratio indices revealed the biophile elements which are associated with cretaceous carbonaceous shale show a single-phase organic matter and low Fe …
The Clay Lake gold target extends for 2 km by 1 km, (c.140 ha / 350 acres) and lies at the north-eastern end of the 40 mile gold trend which Conroy Gold has discovered. This target was named after the Clay Lake Nugget; a 30.05g nugget with a gold content of 28g. The nugget was found in the mid 1980's and is now displayed in the …
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 types of carbonaceous material were present in low concentrations in the Beatrix shale and resembled kerogen.
Assessment of Environmental Geochemistry of Lead-Zinc Mining at Ishiagu Area, Lower Benue Trough, Southeastern Nigeria January 2020 Earth Science Research 9(1):31
Geology and gold content of carbonaceous shale in Baikal mineralization site, Southern Ural. August 2021; Eurasian Mining 1:8-13; ... EURASIAN MINING. 2021. No. 1. pp. 8–13. of Georgia.
Unlike countries such as Ghana and Burkina Faso, Nigeria does not have a well-developed large-scale mining sector, and the majority of gold mining in the country is carried out by artisanal and small-scale miners. Artisanal mining activities in Nigeria are almost by definition informal – that is, operating outside current laws and regulations.
Mining in the Enyigba-Ameri area (EAA) is thought to have some adverse environmental impacts, especially on groundwater and the ecosystem. EAA is entirely underlain by Albian carbonaceous shale, and the area is drained by the Ebonyi River. The aquifers in the area are shallow, less than 40 m, and unconfined.
Unlike countries such as Ghana and Burkina Faso, Nigeria does not have a well-developed large-scale mining sector, and the majority of gold mining in the …
Sample of a gold bearing folded carbon-rich cherty phyllite, (b) graphite schist from the mineralized zone, (c) photomicrograph showing syn-sedimentary carbonaceous material following the ...
of groundwater from fractured Albian carbonaceous shale ... southeastern Nigeria ... 2018/Accepted: 16 January 2019 # Springer Nature Switzerland AG 2019 Abstract Enyigba-Ameri area is known for its Pb–Zn mining activities and the mine water is usually discharged directly into nearby streams and surface
The microprobe study of gold grains taken from carbonaceous shales and weathering crusts made it possible to attribute them to the high-grade (919–1000) type, which is the leading one in the ...
Mining in the Enyigba-Ameri area (EAA) is thought to have some adverse environmental impacts, especially on groundwater and the ecosystem. EAA is entirely …
This assessment examines the legal and policy challenges underpinning the informal artisanal and small-scale gold mining (ASGM) sector in Nigeria. The assessment …
Over 5000 m of sedimentary and volcanic rocks This paper was presented at the 25th Annual Conference of the Nigerian Mining and Geosciences Society (NMGS), Ibadan, Nigeria, March 1989 * Present address: Department of Geology, University of Ibadan, Ibadan, Nigeria 0016-2361/90/040502-07 1990 Butterworth & Co. (Publishers) …
The Wilcox diagram revealed 4 classes of irrigation water types and the irrigation water quality indices showed that the groundwater in the area is not generally suitable for irrigation purposes. Enyigba-Ameri area is known for its Pb–Zn mining activities and the mine water is usually discharged directly into nearby streams and surface runoff. …
The δ 13C isotopic composition of the carbonates range from -2.0 to -5.2 per mil, and a mean of -2.8 per mil. And the δD values in post-sulfide quartz ranges from -35 to -40 per …
PDF | On Nov 27, 2018, A. Chukwu and others published Assessment of Pb, Zn, As, Ni, Cu, Cr and Cd in Agricultural Soils around Settlements of Abandoned Lead-Zinc Mine in Mkpuma Ekwoku, South ...
Article: Hydrochemical characteristics and quality assessment of groundwater from fractured Albian carbonaceous shale aquifers around Enyigba-Ameri Enyigba-Ameri area is known for its Pb-Zn mining activities and the mine water is usually discharged directly into nearby streams and surface runof...
LAGOS — Across Atorin-Ijesha in southwestern Nigeria, the clatter of stones fills the air as excavators aggressively dig into the soil. Gold miners work from dawn till …
In order to better understand the shear creep behavior of weak interlayers (carbonaceous shale) under the coupling effect of the rainfall dry–wet cycle and blasting vibration, as well as quantitatively characterize the coupled damage of the rainfall dry–wet cycle and blasting vibration, a series of shear creep tests were carried out. The results …
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