加纳Prestea金矿带金矿床地质特征

K. Dzigbodi-Adjimah, D. Asamoah
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引用次数: 4

摘要

本文介绍了加纳普雷斯泰金矿带金矿床的地质情况,以辅助该金矿带新矿体的找矿工作。Prestea地区是西非第三大黄金产地,仅次于Obuasi和Tarkwa地区(上个世纪的黄金产量超过250公吨)。金矿床受构造控制,赋存于深部断裂或裂隙带中,被认为是成矿通道。这个构造位于Birimian岩石中变质火山和变质沉积岩的接触处,在Prestea周围的南端比在北部的Bogoso更开阔(包含更多的石英矿脉)。金矿床分为石英脉型(QVT)和浸染型硫化物型(DST)。QVT矿体一般赋存于裂隙带石墨泥内,金品位较高,而DST矿体主要赋存于裂隙带附近的剪切或破碎岩体中。根据地理位置和开发状况,将矿床分为三个部分;Prestea南部的矿床是最不发达的,但Takoradi黄金公司已经进行了广泛的勘探。Prestea金矿有限公司及其前身在Prestea的QVT矿体上专门开采地下矿山;Ariston和Ghana Main Reef公司直到1998年,而Prestea北部的矿床,最初是由Marlu mines在1952年之前作为露天矿山(在DST矿体上)开采的,1990年由Billiton Bogoso Gold恢复。Bogoso Gold Limited是Golden Star Resources的子公司,目前经营着这些矿山,目前在Bogoso和Prestea的露天矿山进行“氧化矿石”(DST矿石的氧化衍生物)的露天开采。目前正在积极勘探,以寻找矿体的延伸,延长矿山的寿命。本文对矿床的特殊属性进行了总结,对矿体的再评价有一定的参考价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The geology of the gold deposits of Prestea gold belt of Ghana
This paper presents the geology of the gold deposits along the Prestea gold belt of Ghana to assist exploration work for new orebodies along the belt. Prestea district is the third largest gold producer in West Africa after Obuasi and Tarkwa districts (over 250 metric tonnes Au during the last century). The gold deposits are structurally controlled and occur in a deep-seated fault or fissure zone that is regarded as the ore channel. This structure, which lies at the contact between metavolcanic and metasedimentary rocks in Birimian rocks, is more open (and contains more quartz lodes) at the southern end around Prestea than at Bogoso to the north. The gold deposits consist of the Quartz Vein Type, (QVT) and the Disseminated Sulphide Type (DST). The QVT orebodies, which generally carry higher Au grades, lie within a graphitic gouge in the fissure zones whilst the DST is found mostly in sheared or crushed rocks near the fissure zones. Deposits were grouped into three in terms of geographic location and state of development; The deposits south of Prestea are the least developed but have been extensively explored by Takoradi Gold Company. Those at Prestea have been worked exclusively as underground mines on QVT orebodies by Prestea Goldfields Limited and its forerunners; Ariston and Ghana Main Reef companies until 1998 whilst the deposits north of Prestea, which were first worked as surface mines (on DST orebodies) by Marlu Mines up to 1952, were revived by Billiton Bogoso Gold in 1990. Bogoso Gold Limited, a subsidiary of Golden Star Resources, now runs the mines, which are currently working “Oxide ore” (the oxidised derivate of the DST ore) by surface operations in open cut mines at Bogoso and Prestea. Active exploration is presently underway to find extensions to the orebodies and extend the life of the mines. The summary of the special attributes of the deposits presented in this paper may be useful in re-evaluation of the orebodies.
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