Characterisation of Small-Scale Gold Mining Tailings in the Western Region of Ghana

I. Cobbinah, G. M. Gbedemah, Z. K. Nurudeen, A. K. Saim, R. Amankwah
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引用次数: 1

Abstract

On average, small-scale miners can recover gold ranging from 20% to 70% of the total available gold by the conventional gravity separation methods only. As a result of this, tailings materials from Artisanal Small-Scale Gold Mining (ASGM) operations contain a significant amount of gold, and characterisation of these materials would inform metallurgical decisions concerning reprocessing of the tailings from ASGM. In this study, size-by-size analysis, gold grade, gold deportment, and cyanidation studies were carried out on ASGM tailings samples collected from five different locations (Asankragua, Bogoso, Prestea, Wassa-Akropong, and Tarkwa) in the Western Region of Ghana. Head grades of tailings samples from Asankragua, Bogoso, Prestea, Wassa-Akropong, and Tarkwa were 1.84 g/t, 4.12 g/t, 0.45g /t, 0.17 g/t, and 5.97 g/t, respectively. The 80% (P80) of the tailings materials passed through 1.797, 0.578, 1.636, 3.210, 0.380 mm screen sizes for samples from Asankragua, Wassa-Akropong, Tarkwa, Prestea and Bogoso, respectively, with an average of 1.52 mm. Also, the gold deportment analysis revealed that the highest metal distribution of 42.03% in -106 µm size fraction for samples from Bogoso, followed by 31.0% for Wassa-Akropong, 29.7% for Tarkwa, 27.0% for Prestea, and 22.0% for Asankragua. It was shown after cyanidation test works that the highest gold recovery was 81.5%, 72.3%, 75.3%, 65.6%, and 38.5% for samples from Wassa-Akropong, Asankragwa, Prestea, Tarkwa, and Bogoso, respectively. Cyanidation can thus be employed to get higher gold recovery in ASGM.
加纳西部地区小型金矿尾矿特征研究
平均而言,仅采用常规重选方法,小型采矿者可回收金总量的20% ~ 70%。因此,来自手工小规模金矿(ASGM)作业的尾矿材料含有大量的黄金,这些材料的特征将为有关手工小规模金矿尾矿再加工的冶金决策提供信息。在这项研究中,对从加纳西部地区的五个不同地点(Asankragua、Bogoso、Prestea、Wassa-Akropong和Tarkwa)收集的ASGM尾矿样本进行了逐级分析、金品位、金分析和氰化研究。Asankragua、Bogoso、Prestea、Wassa-Akropong和Tarkwa尾矿样品的矿头品位分别为1.84 g/t、4.12 g/t、0.45g /t、0.17 g/t和5.97 g/t。Asankragua、Wassa-Akropong、Tarkwa、Prestea和Bogoso的尾矿材料80% (P80)的筛分尺寸分别为1.797、0.578、1.636、3.210和0.380 mm,平均为1.52 mm。此外,金质谱分析显示,Bogoso样品在-106µm粒度分数中的最高金属分布为42.03%,其次是Wassa-Akropong的31.0%,Tarkwa的29.7%,Prestea的27.0%和Asankragua的22.0%。氰化试验结果表明,瓦萨-阿克罗蓬、阿桑克拉格瓦、普雷斯泰、塔克瓦和博戈索样品的金回收率最高,分别为81.5%、72.3%、75.3%、65.6%和38.5%。氰化处理可以提高ASGM的金回收率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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