nigeria carbonaceous shale and gold mining

Artisanal and Small-Scale Gold Mining in Nigeria

Unlike countries such as Ghana and Burkina Faso, Nigeria currently has no well-developed, formalized industrial gold mining sector. While gold prices vary and are subject to boom-and-bust cycles, the recent high prices have attracted a new wave of informal ASGM miners. The

Thor Explorations to build Nigeria's first large …

Thor Explorations acquired Segilola, located about 120km from Nigeria's city of Lagos, in August 2016 and renewed the project's mining licence (for 25 years) three months later, in November 2016.

Multi-stage metal enrichment and formation of gold …

Reducing preg-robbing in carbonaceous gold ores using passivative …

1. Introduction. Carbonaceous gold ores are considered problematic as the native carbonaceous matter within the ore acts as a sink for the gold cyanide complex, competing with the added activated carbon during leach and recovery operations (Pourdasht, 2018).These ores are commonly called preg-robbing as the Au cyanide …

Nigerian Mining Sector Brief

Nigeria is endowed with vast reserves of natural resources such as energy minerals like coal and lithium, metallic minerals like gold and lead-zinc and industrial minerals like limestone and barite. The country was a major exporter of tin, columbite and coal in the 1960s to early 1970s. ... The significant export earnings from crude oil led to ...

(PDF) Geology and gold content of carbonaceous shale in …

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.

Shale

When the content of organic material is more than 1%, it is called carbonaceous shale or black shale. Shale is the source rock for conventional and non-conventional hydrocarbon. Because of its very low porosity and high permeability the storage capacity of shale is very low, and the generated hydrocarbon migrates to a …

Hydrochemical characteristics and quality assessment of …

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.

Carbonaceous Shale and Diagenesis

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 …

'Indicator' carbonaceous phyllite/graphitic schist 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 ...

Treatment for gold ores with high content of carbonaceous matter …

The refractoriness of gold ores occurs by occlusion or entrapment of subatomic gold particles in matrices of sulfide minerals (pyrite, arsenopyrite, stibnite, etc.) and insoluble siliceous gangue, by association with tellurides, clays and carbonaceous matter [].The carbonaceous material can adsorb gold, an effect known as preg-robbing, from the …

Shale Rock: Geology, Composition, Uses

Shale is the most common sedimentary rock, accounting for about 70 percent of the rock in the Earth's crust. Shale is a fine-grained rock made from compacted mud and clay. The defining characteristic of shale is its ability to break into layers or fissility. Black and gray shale are common, but the rock can occur in any color.

Geochemical evaluation of the carbonaceous shale of the …

The gas-prone nature of Nkporo shale showed a thermal evolution of a Type III kerogen with initial HI value between 650 and 800 mgHC/gTOC, S2/S3 < 1, a …

Geology and mineral resources of Ebonyi State, southeastern Nigeria

Anorthosite mining sites at Ezza Imagu (Egesi, 2019). Fig. 6e. Dolerite and gabbro mining site at Mimico Quarry at Afikpo (Ayodele and Ukaegbu, 2017) Structural Characteristics of Lithologies in Ebonyi State Volcanic eruption that took place in Ebonyi State, especially at Abakaliki area has characterized the area as a volcano-sedimentary region.

Geochemical evaluation of the carbonaceous shale of the …

The rise in demand for natural gas has spurred the need to investigate the inland sedimentary basin for more potential sources. In response, the petrophysical parameters of the carbonaceous shale samples from two deep boreholes of Anambra Basin were evaluated. The gas-prone nature of Nkporo shale showed a thermal …

Hydrochemical Characteristics and Assessment of the Impact of Mining

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.

Solid Mineral Deposits and Mining in Nigeria:

laterite, sand, shale and clay that constitute over 95% of production by tonnage and 90% by value. The metallic minerals produced are mainly lead-zinc, manganese, gold, tin and columbite-tantalite ...

Preg-robbing of Gold by Carbonaceous Materials …

Amanya, F., Ofori-Sarpong, G., Anni, V. and Amankwah, R. K. (2017), "Preg-robbing of Gold by Carbonaceous Materials Encountered in Gold Processing", Ghana Mining Journal, Vol. 17, No. 2, pp. 50 - 55. Abstract Processing of gold from refractory ores containing carbonaceous materials (CM) poses challenges due to the ability of the CM …

Nigerian Mining

Four Nigerians Granted N80 Million in Bail in Illegal Gold Mining Case ... Barriers to Success in Nigeria's Gold Mining Sector. September 11, 2024; Taraba Governor Disbands Environmental Taskforce. September 11, 2024; Nigerian Mining Sector Sees 110% Increase in CIT Collections in Q2 2024.

'Indicator' carbonaceous phyllite/graphitic schist in the …

graphitic schist, carbonaceous phyllite/shale that are constituted of immatureorganic carbon or kero-gen. Nano-scale gold inclusions along with free milling gold are associated with sulfidemineral phases present within the carbonaceous host rocks as well as in mineralized quartz-carbonate veins. Deposi-

Hydrochemical characteristics and quality assessment of …

Request PDF | Hydrochemical characteristics and quality assessment of groundwater from fractured Albian carbonaceous shale aquifers around Enyigba-Ameri, southeastern Nigeria | Enyigba-Ameri area ...

Shale pore characteristics and their impact on the gas …

Deep shale has the characteristics of large burial depth, rapid changes in reservoir properties, complex pore types and structures, and unstable production. The whole-rock X-ray diffraction (XRD ...

2017 2018 Minerals Yearbook

mining and quarrying (Nigeria Extractive Industries Transparency Initiative, 2018). Small-scale and artisanal miners produced gemstones, gold, and other commodities. Nigeria …

Study on mechanical properties and damage evolution of carbonaceous …

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.

Treatment for gold ores with high content of …

depending on the type of carbonaceous matter, the maturation of the coal and the quantity available [16]. The carbonaceous ores can be classified into two main categories: i) Mildly carbonaceous ores with a total content of organic and graphitic carbon less than 1%. ii) Highly carbonaceous ore, typically containing more than

An investigation of the carbonaceous component of …

Over the last 40 years, numerous investigations have focussed on the preg-robbing capacity of carbonaceous material during gold ore processing. Various techniques …

A black shale protolith for gold-tellurium mineralisation in …

The host succession includes carbonaceous, pyritic shales (pelites) which were a source of trace elements, including gold and tellurium. LA-ICP-MS mapping of pyrite crystals shows that late stages are enriched in gold, tellurium and lead, representing concentration of these elements during metamorphism and related hydrothermal activity.

Banded iron formations, pyritic black shale, and gold …

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) black shale.

Artisanal and Small-Scale Gold Mining in Nigeria

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.

Hydrochemical characteristics and quality assessment of …

of groundwater from fractured Albian carbonaceous shale ... southeastern Nigeria ... online: 4 February 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 runoff. In order to determine the impacts of ...