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CHIRANO GOLD MINEGeology The Chirano Mine lies within the Proterozoic terrain of southwest Ghana. It occurs along the margin of the Sefwi Belt adjacent to the Kumasi Basin to the east. Both the Sefwi Belt and the Kumasi Basin comprise rocks of Birimian age, with the belt dominated by mafic volcanics and the basin typified by fine grained, deep water sediments. Both are intruded by granites. The belt margin is characterized by regional scale, reactivated thrust faults which juxtapose the sedimentary basin and volcanic belt terrains and are known in the Chirano area as the Bibiani shear zone since the Bibiani deposit (+5Moz historic production and current resources) is inferred to be located along the same structure 18 km to the northeast. The Chirano deposits are hosted by the Chirano shear zone, a splay off the Bibiani shear. At Chirano, a small, faulted sliver of younger Tarkwaian shallow water sediments (dominantly arkose) separates the two structures. The Chirano gold deposits are hosted by an elongate, altered tonalite intrusive, adjacent to or within 200m to the west of the Chirano shear. The deposits occur at regular intervals along a mineralised zone 9 kilometres long. The geometry and shape of the deposits range from tabular (Obra), or pipe-like (Tano), to multiple parallel lodes (Paboase). The mineralised zone thickness ranges from a few metres to over 70 metres. Most deposits dip very steeply towards the west or southwest, and also plunge very steeply. Generally, the tenor of the gold mineralisation correlates with the intensity of alteration, veining and brecciation. |
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