konongo tarkwaian rocks

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Konongo Tarkwaian Rocks Acsrijnmondnl Mining and Metal Pollution Assessment of Water Quality in igneous rocks Fig 2 The Tarkwaian is a long and narrow syncline trending northeast about 250 km long and 160 km wide Kortatsi 2002 It overlies the Birimian formation and show characteristics of immature and coarsegrained sedimentary rocks

The Tarkwaian formation was identified by the significant Th signature at the northeast and southeast of Figures 5D and 6A The metavolcanic rocks MV1 MV2 and MV3 in Figure 3A have high magnetic anomalies but possess very low K and Th concentrations and the K normalized map of Figure 5A low K concentration showed their distinct boundaries

The geology of the Konongo mine is found to consist of a series of metavolcanic rock units at the central and eastern part of the area metasedimentary rocks unit at the western part and Tarkwaian formation in the northeast which widens and truncates in the south where a number of intrusive mafic dyke systems and granitoids are also located

Lithologically the main rocks encountered in the Kwahu Praso areas are metavolcanic hypabyssal and metasedimentary rocks Tarkwaian sandstones and phyllites and granitic intrusions The Birimian metasedimentary rocks are composed of black or dark argillaceous schists phyllites and semiarenaceous greywackes meta greywackes and schists

Our current research outlines the stratigraphy structure approximate age and depositional setting of the volcaniclastic sequence in the Cape Three Points area in Ghana West Konongo Ashanti belt is composed of mainly andesitic basalts volcaniclastic rocks and belt type granitoids which are unconformably overlain by Tarkwaian conglomerates and metasedimentary rocks

established A minimum age for the Tarkwaian is given by a cross cutting pegmatite near Konongo Ghana of 1700 My Holmes Cahen 1957 Bonhomme 1962 found that syntectonic granites in Ivory Coast marking the final stages of the Eburnian folding and metamorphism produced ages between 1830 and 2030 My Later work

Nov 01 1993 · The Tarkwaian unit and granites have been faulted into place along high angle faults with a strong strike slipshear component Narrow elongate zones of highly silicified rocks are interpreted as occupying sites of faulting and brittle failure within the shear zone

The traditional concept of the Early Proterozoic gold deposits in Ghana ie goldbearing shear zones overlain by Tarkwaian paleoplacers containing reworked gold derived from the shearzones needs to be reconsidered in the light of recent research in Ghana the Ivory Coast and French Guiana

Apr 01 1993 · A major gold province of the world exists in the Proterozoic Birimian and Tarkwaian supracrustal rocks of West Africa The bulk of the gold comes from the primary lode occurrences of the Birimian rocks of Ghana formerly The Gold Coast Birimian lithofacies is characterised by subaqueous finegrained sediments with bimodal volcanic material

The Konongo and adjoining Kurofa concessions cover 192 square kilometres and are along the strike of the prolific goldproducing Ashanti Sheer Zone A processing plant is located northwest of the capital city of Accra about 50 kilometres from the countrys second largest city Kumasi which supports mining activities in the area

metasedimentary rocks in the Konongo area with the sedimentary rocks Tarkwaian sandstones and phyllites and granitic intrusions The Birimian metasedimentary rocks

Lithologically the main rocks encountered in the Kwahu Praso areas are metavolcanic hypabyssal and metasedimentary rocks Tarkwaian sandstones and phyllites and granitic intrusions The Birimian metasedimentary rocks are composed of black or dark argillaceous schists phyllites and semiarenaceous greywackes meta greywackes and schists

rocks along a shear zone that closely follows the BirimianTarkwaian contact and extends for a strike length of 16 km Fig 2 Generally the main ore channel follows the contact between the Birimian rocks to the west and the Tarkwaian rocks to the east However towards the NE and SW ends of the gold belt Tarkwaian rocks

Tarkwaian rocks consist of coarse clastic sedimentary rocks that include conglomerates arkoses sandstones and minor shales Pebbles in the conglomerates include volcanic and sedimentary clasts derived from the Birimian rocks and granitoids Eisenlohr and Hirdes 1992 The Tarkwaian rocks are commonly found in close

Nov 01 1993 · The Tarkwaian unit and granites have been faulted into place along high angle faults with a strong strike slipshear component Narrow elongate zones of highly silicified rocks are interpreted as occupying sites of faulting and brittle failure within the shear zone

Two major epigenetic goldforming events are recorded in the worldclass gold province of southwest Ghana 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 eg Prestea to giant eg Obuasi orogenic gold deposits which have made the region

Our current research outlines the stratigraphy structure approximate age and depositional setting of the volcaniclastic sequence in the Cape Three Points area in Ghana West Konongo Ashanti belt is composed of mainly andesitic basalts volcaniclastic rocks and belt type granitoids which are unconformably overlain by Tarkwaian

Tarkwaian clastic sediments were deposited between 2132 and 2116 Ma age of youngest detrital zircon in the Tarkwaian sediments and age of oldest basintype granitoid respectively Davis et al 1994 at the onset of deformation Birimian and Tarkwaian rocks

Supergroup and the Tarkwaian Group Figure 1 ˜ e Birimian a dominantly marine turbidite series is composed largely of phyllites schists metagreywackes and in places is interbedded with metavolcanic rocks including lavas and volcanoclastic rocks Hammond and Tabata 1997 Nonconformably overlying the Birimian are the continental

The Mineral and Rock Resources of Ghana Geological Survey Department 642 AA Rotterdam Balkema has been cited by the following article TITLE Interpretation of Geological Structures Hosting Potential Gold Deposits in the Konongo Gold Mine Using Airborne Magnetic Electromagnetic and Radiometric Datasets

Paleoproterozoic Birimian Supergroup rocks of southwest Ghana host numerous mesothermal lode gold deposits including the 38 million ounce Moz Ashanti deposit at Obuasi and other multimillion ounce deposits at Bogoso Konongo Prestea Bibiani and in the YamfoSefwi region

associated with outcrops of the Upper Birimian rocks One area of intense concentration is along the margins of the main Tarkwaian trough Fig 1 Gold occurs along the western margin of the trough and has been mined at various localities from Axim through Akanko Prestea and Obuasi to Konongo a distance of about 200 km Mining

The Tarkwaian Group is commonly found in close proximity to Birimian volcanic rocks either as unconformable stratigraphic contacts or as imbricated faultbounded slices The Birimian hosts the world class Obuasi gold deposit of the Ashanti Goldfields Company it also hosts the Prestea Bogoso Ayanfuri Amansie Konongo and Yamfo gold deposits