Chapter 1 of these Explanatory Notes is introductory, whereas Chapter 2 summarizes the present state of knowledge of Birimian and Tarkwaian rocks in Ghana and the neighbouring countries. Chapter 3 describes the geology, petrography and some geochemistry of all the different lithological units distinguished on the 1:100,000 geological maps.
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Geology of the North Ashanti Gold Project. The Konongo area was mapped by the Ghana Geological Survey in 1937 and 1967. The 1967 work included a geological survey that defined broad areas of gold and arsenic mineralization. Survey results were published as .
Jan 26, 2016· Several researchers have documented the environmental and socioeconomic impacts of gold mining in other countries [5,6,7,8]. However, due to research specialization and disciplinespecific worldviews, seldom does research integrate the natural and social dimensions of the impacts of gold mining in a single paper [8,9].
sedimentary rocks into which most of the granitoids have been intruded. Woodfield (1966), Leube et al., (1990) and Hirdes et al., (1993) stated that the Birimian rocks comprise of basaltic and andesitic lavas interlayered with volcanogenic turbidites, with rare rhyolitic and dacitic lavas and pyroclastic rocks and some clastic sedimentary rocks.
Over the Tarkwaian rocks, the topography is rugged and hilly rather than smooth and flat or gently undulating. The savanna high plain is more gently rolling than the forestdissectedplateau and is the most widespread rocks are granites. The average height is between 180 and 300
Auriferous quartzpebble conglomerates that occur as intrusive veins in phyllites and greenstones within the Birimian and the Tarkwaian rock system. The veins are found in two main places (1) near or at the contact of the Lower and Upper Birimain rocks; and (2) the reefs within the Birimian rocks.
The Birimian rock was identified as volcanic rich greenstone belt; Kumasi Group is foreland basin with shale and sandstone, quartzite and turbidite derived from Ga granite in the Birimian; Tarkwaian Group is composed of coarse detrital sedimentary rocks deposited along a strikeslip fault in the Birimian.
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contact between the Tarkwaian rocks at the west and older Birimian Supergroupto the east (Eisenlohr and Hirdes, 1992). The Tarkwaian Group is made up of a sequence of clastic sedimentary rocks, which comprises of sandstones, conglomerates and phyllites. It is spatially associated with µbelt ¶ vo lcanic rocks and granitoids of the Birimian.
Abstract— Representative rocks of the metasediment suite granitoids (basintype granitoids) were selected from the Atia area in the Ashanti part of Ghana for geochemical analyses. The rocks contained quartz, plagioclase, microcline, biotite, muscovite, and garnet as the main mineral phase.
Wassa lies within the Eburnean Tectonic Province in the West African Precambrian Shield. The Proterozoic rocks that comprise most of the West African craton and host the major gold mineralization in Ghana are subdivided into metasedimentary and volcanic rocks .
is classified into Birrimain and Tarkwaian rocks. Major rivers draining the southwestern basin system are Bia (enters the sea in La Cote d'Ivoire), Tano, Ankobra and Pra. The coastal basin system (dry equatorial) is relatively dry, with annual rainfall values ranging between 740 and 890 mm (Dickson .
The Tarkwaian is a clastic sequence deposited in an elongate basin and is the second largest source of gold in Ghana. The gold deposits are fossil placer deposits and the mineralization, somewhat remobilised, may represent detrital gold weathered out of the mineralised Birimian rocks.
W. Abouchami, M. Boher, A. Michard, and F. Albarède, A major Ga event of mafic magmatism in west Africa: An Early stage of crustal accretion, Journal of ...
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Annual QPR for Selected Deposits, Konongo Gold Project for the Year Ended 31 March 2014 LionGold Corporation Ltd 140522_Signature_Konongo_QPR 2014_FINAL v Figure WestEast section of Obenemase D, showing the ore envelope and associated drill hole data..45
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The similar structural timing of epigenetic gold mineralisation in Tarkwaian host rocks at Damang to that in mainly Birimian host rocks elsewhere in southwest Ghana, particularly at Obuasi, suggests that 20639 Ma is the best available age estimate for widespread orogenic gold mineralisation in the region.
A preTarkwaian event was the source of the worldclass Tarkwa palaeoplacers whereas postBirimian and Tarkwaian deformation, which was related to the Eburnean orogeny, gave rise to the worldclass ( Prestea) to giant ( Obuasi) orogenic gold deposits which have made the region famous for more than 2,500 years.
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