Samuel Nunoo | University of Johannesburg, South Africa (original) (raw)

Papers by Samuel Nunoo

Research paper thumbnail of The geology and geochemistry of the Rhyacian Josephine gold deposit, Northwest Ghana

Applied Earth Science

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Research paper thumbnail of The search for plausible economic mineral deposits in the central parts of Tanzania; insight from stream sediment geochemistry, multivariate statistics and geostatistics

Heliyon

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Research paper thumbnail of The Hydrochemistry of Groundwater of a Typical Artisanal Mining Area in Ghana: A Caseof Southern Bole – Nangodi Greenstone Belt of Ghana

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Research paper thumbnail of Groundwater characterization including prediction of the quality, fluoride, and nitrate occurrence in a typical artisanal mining area in Ghana: A hydrochemical and multivariate statistical approach

Groundwater for Sustainable Development

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Research paper thumbnail of Geochemical and multivariate statistical characterization of shales of the Oti−Pendjari Group of the Neoproterozoic Basin of Ghana: implication of paleoweathering, climatic conditions, and provenance

Journal of Sedimentary Environments

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Research paper thumbnail of Impact of artisanal small-scale (gold and diamond) mining activities on the Offin, Oda and Pra rivers in Southern Ghana, West Africa: A scientific response to public concern

Heliyon

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Research paper thumbnail of A comparative study of bulk leach extractable gold (BLEG) and fire assay methods on the Wassa deposit at Golden Star Limited, Wassa mine

International Journal of Basic and Applied Sciences, 2018

Golden Star Resources Limited conducts Bulk Leach Extractable Gold (BLEG) and Fire Assay methods ... more Golden Star Resources Limited conducts Bulk Leach Extractable Gold (BLEG) and Fire Assay methods on samples from its exploration program. Additionally, for mining control and as part of the sampling and analytical protocol, residues of samples whose assay values are greater than 10 g/t are subjected to fire assay to determine the quantity of gold. However, there is gold retained in the tails or residue after leaching and to verify the suitability and efficiency of the analytical method, drill samples (RC and DD) with control samples were analysed using BLEG method based on the accelerated cyanide leach extraction and Fire Assay method on the tails.Percentages of the prepared samples were subjected to BLEG orientation study to investigate the leachability and efficiency of the BLEG method on the ore samples. Fire Assay analysis was also carried out on the selected tailing samples to find out the assay reproducibility of the samples. The analytical analyses carried out on the samples ...

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Research paper thumbnail of Evolution of cohesion and friction angle during microfracture accumulation in rock

Natural Hazards, 2015

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Research paper thumbnail of Numerical study of the evolution of cohesion and internal friction in rock during the pre-peak deformation process

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Research paper thumbnail of Inorganic geochemistry and hydrocarbon potential of the Voltaian Basin of Ghana, West Africa

Marine and Petroleum Geology

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Research paper thumbnail of Deciphering structures and deformation of the Obuom Gold Prospect, Central Ashanti Belt of Ghana: A lithostructural approach

Journal of African Earth Sciences, 2016

Abstract The Obuom Gold Prospect is located in the central part of the Paleoproterozoic Birimian ... more Abstract The Obuom Gold Prospect is located in the central part of the Paleoproterozoic Birimian Ashanti belt of southwest Ghana. The prospect is approximately 45 km 2 and is underlain by basalt, andesite and dacite volcanic beds, graphitic and chlorite phyllites of sedimentary origin and granites. Published works on the Obuom geological terrane, using gravity models, showed that, the structures are more complex than previously thought and may involve multiple thrust slices. This research identified two deformational episodes; the first has a remarkable sinistral sense probably synchronous with an Eoeburnean event with the second, an overprint of dextral shearing during the Eburnean event. The first episode, Do 1 is characterized by NW-SE compression which resulted in subvertical NE-SW trending S 1 axial plane metamorphic foliation in tight to isoclinal F 1 folds with NW-SE trending L 1 lineations. The second episode, Do 2 indicates continuous shortening which produced nearly upright F 2 folds with east-west striking axial planes, slight plunging hinges and associated subparallel crenulation cleavages. The first deformational event Do 1 which represent NW-SE compression is observed affecting only the Sefwi Group. The Do 2 resulting from N-S compression affected both the Sefwi and Kumasi Groups.

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Research paper thumbnail of Crustal modelling from Pan-African granites of the Colomine Gold District, SE Cameroon: Insights from zircon U-Pb dating and Lu-Hf isotope systematics

Journal of African Earth Sciences

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Research paper thumbnail of Assessment of natural radioactivity and radon exhalation rate associated with rock properties used for construction in greater Accra region, Ghana

Journal of Radioanalytical and Nuclear Chemistry

Natural radioactivity, radon exhalation and rock properties have been studied using gamma spectro... more Natural radioactivity, radon exhalation and rock properties have been studied using gamma spectrometry, CR-39 detectors and weighing methods. Statistical tool was used to study the relationship between the activity concentration and properties associated with the rocks. The purpose is to determine the rocks with good properties and lower radioactivity levels in order to reduce radiological effect when used as building materials. Gneiss recorded good properties while quartzite was found to contain poor and lower value of radiological parameters as compared to granite and sandstone. Radon-222 was found to correlate well with the properties than radionuclides of radium-226, thorium-232 and potassium-40.

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Research paper thumbnail of Geology, zircon U–Pb dating and εHf data for the Julie greenstone belt and associated rocks in NW Ghana: Implications for Birimian-to-Tarkwaian correlation and crustal evolution

Journal of African Earth Sciences

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Research paper thumbnail of Deciphering structures and deformation of the Obuom Gold Prospect, Central Ashanti Belt of Ghana: A lithostructural approach

The Obuom Gold Prospect is located in the central part of the Paleoproterozoic Birimian Ashanti b... more The Obuom Gold Prospect is located in the central part of the Paleoproterozoic Birimian Ashanti belt of southwest Ghana. The prospect is approximately 45 km 2 and is underlain by basalt, andesite and dacite volcanic beds, graphitic and chlorite phyllites of sedimentary origin and granites. Published works on the Obuom geological terrane, using gravity models, showed that, the structures are more complex than previously thought and may involve multiple thrust slices. This research identified two deformational episodes; the first has a remarkable sinistral sense probably synchronous with an Eoeburnean event with the second, an overprint of dextral shearing during the Eburnean event. The first episode, Do 1 is characterized by NW-SE compression which resulted in subvertical NE-SW trending S 1 axial plane meta-morphic foliation in tight to isoclinal F 1 folds with NW-SE trending L 1 lineations. The second episode, Do 2 indicates continuous shortening which produced nearly upright F 2 folds with east-west striking axial planes, slight plunging hinges and associated subparallel crenulation cleavages. The first deformational event Do 1 which represent NW-SE compression is observed affecting only the Sefwi Group. The Do 2 resulting from N-S compression affected both the Sefwi and Kumasi Groups.

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Research paper thumbnail of The geology and geochemistry of the Rhyacian Josephine gold deposit, Northwest Ghana

Applied Earth Science

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Research paper thumbnail of The search for plausible economic mineral deposits in the central parts of Tanzania; insight from stream sediment geochemistry, multivariate statistics and geostatistics

Heliyon

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Hydrochemistry of Groundwater of a Typical Artisanal Mining Area in Ghana: A Caseof Southern Bole – Nangodi Greenstone Belt of Ghana

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Groundwater characterization including prediction of the quality, fluoride, and nitrate occurrence in a typical artisanal mining area in Ghana: A hydrochemical and multivariate statistical approach

Groundwater for Sustainable Development

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Geochemical and multivariate statistical characterization of shales of the Oti−Pendjari Group of the Neoproterozoic Basin of Ghana: implication of paleoweathering, climatic conditions, and provenance

Journal of Sedimentary Environments

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Research paper thumbnail of Impact of artisanal small-scale (gold and diamond) mining activities on the Offin, Oda and Pra rivers in Southern Ghana, West Africa: A scientific response to public concern

Heliyon

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A comparative study of bulk leach extractable gold (BLEG) and fire assay methods on the Wassa deposit at Golden Star Limited, Wassa mine

International Journal of Basic and Applied Sciences, 2018

Golden Star Resources Limited conducts Bulk Leach Extractable Gold (BLEG) and Fire Assay methods ... more Golden Star Resources Limited conducts Bulk Leach Extractable Gold (BLEG) and Fire Assay methods on samples from its exploration program. Additionally, for mining control and as part of the sampling and analytical protocol, residues of samples whose assay values are greater than 10 g/t are subjected to fire assay to determine the quantity of gold. However, there is gold retained in the tails or residue after leaching and to verify the suitability and efficiency of the analytical method, drill samples (RC and DD) with control samples were analysed using BLEG method based on the accelerated cyanide leach extraction and Fire Assay method on the tails.Percentages of the prepared samples were subjected to BLEG orientation study to investigate the leachability and efficiency of the BLEG method on the ore samples. Fire Assay analysis was also carried out on the selected tailing samples to find out the assay reproducibility of the samples. The analytical analyses carried out on the samples ...

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Research paper thumbnail of Evolution of cohesion and friction angle during microfracture accumulation in rock

Natural Hazards, 2015

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Research paper thumbnail of Numerical study of the evolution of cohesion and internal friction in rock during the pre-peak deformation process

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Inorganic geochemistry and hydrocarbon potential of the Voltaian Basin of Ghana, West Africa

Marine and Petroleum Geology

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Deciphering structures and deformation of the Obuom Gold Prospect, Central Ashanti Belt of Ghana: A lithostructural approach

Journal of African Earth Sciences, 2016

Abstract The Obuom Gold Prospect is located in the central part of the Paleoproterozoic Birimian ... more Abstract The Obuom Gold Prospect is located in the central part of the Paleoproterozoic Birimian Ashanti belt of southwest Ghana. The prospect is approximately 45 km 2 and is underlain by basalt, andesite and dacite volcanic beds, graphitic and chlorite phyllites of sedimentary origin and granites. Published works on the Obuom geological terrane, using gravity models, showed that, the structures are more complex than previously thought and may involve multiple thrust slices. This research identified two deformational episodes; the first has a remarkable sinistral sense probably synchronous with an Eoeburnean event with the second, an overprint of dextral shearing during the Eburnean event. The first episode, Do 1 is characterized by NW-SE compression which resulted in subvertical NE-SW trending S 1 axial plane metamorphic foliation in tight to isoclinal F 1 folds with NW-SE trending L 1 lineations. The second episode, Do 2 indicates continuous shortening which produced nearly upright F 2 folds with east-west striking axial planes, slight plunging hinges and associated subparallel crenulation cleavages. The first deformational event Do 1 which represent NW-SE compression is observed affecting only the Sefwi Group. The Do 2 resulting from N-S compression affected both the Sefwi and Kumasi Groups.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Crustal modelling from Pan-African granites of the Colomine Gold District, SE Cameroon: Insights from zircon U-Pb dating and Lu-Hf isotope systematics

Journal of African Earth Sciences

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Assessment of natural radioactivity and radon exhalation rate associated with rock properties used for construction in greater Accra region, Ghana

Journal of Radioanalytical and Nuclear Chemistry

Natural radioactivity, radon exhalation and rock properties have been studied using gamma spectro... more Natural radioactivity, radon exhalation and rock properties have been studied using gamma spectrometry, CR-39 detectors and weighing methods. Statistical tool was used to study the relationship between the activity concentration and properties associated with the rocks. The purpose is to determine the rocks with good properties and lower radioactivity levels in order to reduce radiological effect when used as building materials. Gneiss recorded good properties while quartzite was found to contain poor and lower value of radiological parameters as compared to granite and sandstone. Radon-222 was found to correlate well with the properties than radionuclides of radium-226, thorium-232 and potassium-40.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Geology, zircon U–Pb dating and εHf data for the Julie greenstone belt and associated rocks in NW Ghana: Implications for Birimian-to-Tarkwaian correlation and crustal evolution

Journal of African Earth Sciences

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Deciphering structures and deformation of the Obuom Gold Prospect, Central Ashanti Belt of Ghana: A lithostructural approach

The Obuom Gold Prospect is located in the central part of the Paleoproterozoic Birimian Ashanti b... more The Obuom Gold Prospect is located in the central part of the Paleoproterozoic Birimian Ashanti belt of southwest Ghana. The prospect is approximately 45 km 2 and is underlain by basalt, andesite and dacite volcanic beds, graphitic and chlorite phyllites of sedimentary origin and granites. Published works on the Obuom geological terrane, using gravity models, showed that, the structures are more complex than previously thought and may involve multiple thrust slices. This research identified two deformational episodes; the first has a remarkable sinistral sense probably synchronous with an Eoeburnean event with the second, an overprint of dextral shearing during the Eburnean event. The first episode, Do 1 is characterized by NW-SE compression which resulted in subvertical NE-SW trending S 1 axial plane meta-morphic foliation in tight to isoclinal F 1 folds with NW-SE trending L 1 lineations. The second episode, Do 2 indicates continuous shortening which produced nearly upright F 2 folds with east-west striking axial planes, slight plunging hinges and associated subparallel crenulation cleavages. The first deformational event Do 1 which represent NW-SE compression is observed affecting only the Sefwi Group. The Do 2 resulting from N-S compression affected both the Sefwi and Kumasi Groups.

Bookmarks Related papers MentionsView impact