Occurrence and composition of manganese oxide minerals from the Nauta manganese deposit, Western Ghana

X-ray diffraction, ore microscopy, and electron microprobe studies have been done on ore samples obtained from the mine site at Nsuta, Ghana. Manganese ore minerals identified include nsutite, cryptomelane, pyrolusite, and lithiophorite. Except for pyrolusite, all these minerals are poorly crystalline. Chemical compositions of the minerals indicate little contamination by other elements. Quartz, muscovite, and clay minerals feature prominently as gangue in most samples. Textures are varied, and modes of occurrence are prinicipally by replacements, cavity or fracture fills, leaching and precipitaion. Mineral associations seem rather complex, as a result of which definitive paragenetic relations could not be established. Supergene formation of the manganese oxide ore is shown by the abundance of manganese minerals in solution channels such as fractures and cavities within silicate gangue. Much of the ore, howver, appears to have been enriched by leaching of gangue minerals and the later addution of manganese

Occurrence and composition of manganese oxide minerals from the Nsuta manganese deposit, Western Ghana

X-ray diffraction, ore microscopy, and electron microprobe studies have been done on ore samples obtained from the mine site at Nsuta, Ghana. Manganese ore minerals identified include nsutite, cryptomelane, pyrolusite, and lithiophorite. Except for pyrolusite, all these minerals are poorly crystalline. Chemical compositions of the minerals indicate little contamination by other elements. Quartz, muscovite, and clay minerals feature prominently as gangue in most samples. Textures are varied, and modes ofoccurrence are principally by replacements, cavity or fracture fills, leaching and precipitation. Mineral associations seem rather complex, as a result of which definitive paragenetic relations could not be established. Supergene formation of the manganese oxide ore is shown by the abundance of manganese minerals in solution channels such as fractures and cavities within silicate gangue. Much of the ore, however, appears to have been enriched by leaching of gangue minerals and the later addition of manganese

Stratigraphy and Age Constraint of Birimian Volcanoclastic Sequence in the Ashanti Belt, Southwest Ghana

第8回極域科学シンポジウム/個別セッション：[OG] 極域地圏12月6日（水）国立極地研究所 3階セミナー室The Eighth Symposium on Polar Science/Ordinary sessions: [OG] Polar GeosciencesWed. 6 Dec./3F Seminar room, National Institute of Polar Researc

Influence of land tenure practices on artisanal mining activity in Ghana

This paper examines the issue of land tenure and how it influences artisanal and small-scale mining (ASM) activity in Ghana. Over the past few decades, attempts by governments in sub-Saharan Africa to regulate or formalize ASM as a result of the sector's increasing socio-economic and environmental importance have largely been unsuccessful. Even though mining laws have tended to vest all minerals in the state, increasing evidence suggests that mineral-rich lands for artisanal mining continue to be frequently traded between local landowners and miners or interested groups outside the official legal regime. This development, i.e. land trading for artisanal mining, contributes significantly towards proliferation of illegal ASM activity and hence potentially challenges attempts by governments and development partners to formalise the sector.Artisanal mining Land tenure Ghana

Perspectives on migration patterns in Ghana's mining industry

This paper examines migration patterns in Ghana's mining sector, and briefly highlights linkages between stages of mine development and migration flows. The growth, stagnation and closure phases of mine development may each be characterised by distinct migration patterns. The paper concludes with policy-relevant implications of the dynamics of migration patterns in the mining sector, arguing in particular that Ghana is, in addition to traditionally being a country of destination, becoming a transit area for prospective migrant miners.Migration Ghana Mining