{"title":"加纳Abosso Goldfields Limited (AGL)酸性矿山排水潜力评估","authors":"J. Kuma, D. Asamoah","doi":"10.4314/GM.V9I1.42604","DOIUrl":null,"url":null,"abstract":"Occurrence of Acid Rock Drainae (ARD) affects both plants and animals that are present in a drainage system. In some base metal and coal mining environments, the presence of sulphide minerals especially pyrite and their exposure to oxygen and water may trigger Acid Mine Drainage (AMD). Evaluation of the potential for acid generation is therefore very important in any mine setting where sulphide minerals exist. Results of two Acid-Base Accounting (ABA) studies conducted at Abosso Goldfields Limited (AGL) on 120 rock and tailings samples reveal that on average, total sulphide values in rocks are low, with 83 % less than 0.20 %. More than 95 % show Neutralisation Potential Ratio (NPR) of 2 and above, indicating the presence of excess neutralising capacity in the rocks and tailings to prevent acid generation. Also, more than 93 % of the samples possess long-term acid neutralisation because their Neutralisation Potentials (NP) are more than 10 and their total sulphide are less than 0.1 %. Average up- and down- stream measurements of pH were respectively 6.55 and 6.74 while for TSS (Total Suspended Solids), the values were respectively 14.9 mg/l and 7.2 mg/l, indicating improved water quality after passing through the mine. Although these figures show very high NP's, the presence of less than 7% samples with the potential to generate acidity necessitates that AMD monitoring should continue, especially in meta-sedimentary and siltstones to ensure acid generation does not arise during mining. Ghana Mining Journal Vol. 9 2007: pp. 8-16","PeriodicalId":12530,"journal":{"name":"Ghana Mining Journal","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2009-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Evaluating the Acid Mine Drainage Potential at Abosso Goldfields Limited (AGL), Ghana\",\"authors\":\"J. Kuma, D. Asamoah\",\"doi\":\"10.4314/GM.V9I1.42604\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Occurrence of Acid Rock Drainae (ARD) affects both plants and animals that are present in a drainage system. In some base metal and coal mining environments, the presence of sulphide minerals especially pyrite and their exposure to oxygen and water may trigger Acid Mine Drainage (AMD). Evaluation of the potential for acid generation is therefore very important in any mine setting where sulphide minerals exist. Results of two Acid-Base Accounting (ABA) studies conducted at Abosso Goldfields Limited (AGL) on 120 rock and tailings samples reveal that on average, total sulphide values in rocks are low, with 83 % less than 0.20 %. More than 95 % show Neutralisation Potential Ratio (NPR) of 2 and above, indicating the presence of excess neutralising capacity in the rocks and tailings to prevent acid generation. Also, more than 93 % of the samples possess long-term acid neutralisation because their Neutralisation Potentials (NP) are more than 10 and their total sulphide are less than 0.1 %. Average up- and down- stream measurements of pH were respectively 6.55 and 6.74 while for TSS (Total Suspended Solids), the values were respectively 14.9 mg/l and 7.2 mg/l, indicating improved water quality after passing through the mine. Although these figures show very high NP's, the presence of less than 7% samples with the potential to generate acidity necessitates that AMD monitoring should continue, especially in meta-sedimentary and siltstones to ensure acid generation does not arise during mining. Ghana Mining Journal Vol. 9 2007: pp. 8-16\",\"PeriodicalId\":12530,\"journal\":{\"name\":\"Ghana Mining Journal\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2009-02-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Ghana Mining Journal\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.4314/GM.V9I1.42604\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ghana Mining Journal","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.4314/GM.V9I1.42604","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
酸性岩石排水(ARD)的发生对排水系统中的植物和动物都有影响。在一些贱金属和煤矿开采环境中,硫化物矿物特别是黄铁矿的存在以及它们与氧气和水的接触可能引发酸性矿井排水(AMD)。因此,在任何有硫化物矿物存在的矿山环境中,评价产酸潜力是非常重要的。在Abosso Goldfields Limited (AGL)对120个岩石和尾矿样本进行的两次酸碱会计(ABA)研究结果显示,岩石中的总硫化物值平均较低,83%小于0.20%。95%以上矿体的中和电位比(NPR)大于等于2,说明矿体和尾矿中存在过量的中和能力以防止酸的产生。此外,超过93%的样品具有长期酸中和作用,因为它们的中和电位(NP)大于10,它们的总硫化物低于0.1%。上游和下游的平均pH值分别为6.55和6.74,TSS值分别为14.9 mg/l和7.2 mg/l,表明通过矿山后水质有所改善。尽管这些数据显示出非常高的NP值,但只有不到7%的样品具有产生酸性的潜力,因此需要继续进行AMD监测,特别是在变质沉积岩和粉砂岩中,以确保在采矿过程中不会产生酸性。加纳矿业杂志Vol. 9 2007: pp. 8-16
Evaluating the Acid Mine Drainage Potential at Abosso Goldfields Limited (AGL), Ghana
Occurrence of Acid Rock Drainae (ARD) affects both plants and animals that are present in a drainage system. In some base metal and coal mining environments, the presence of sulphide minerals especially pyrite and their exposure to oxygen and water may trigger Acid Mine Drainage (AMD). Evaluation of the potential for acid generation is therefore very important in any mine setting where sulphide minerals exist. Results of two Acid-Base Accounting (ABA) studies conducted at Abosso Goldfields Limited (AGL) on 120 rock and tailings samples reveal that on average, total sulphide values in rocks are low, with 83 % less than 0.20 %. More than 95 % show Neutralisation Potential Ratio (NPR) of 2 and above, indicating the presence of excess neutralising capacity in the rocks and tailings to prevent acid generation. Also, more than 93 % of the samples possess long-term acid neutralisation because their Neutralisation Potentials (NP) are more than 10 and their total sulphide are less than 0.1 %. Average up- and down- stream measurements of pH were respectively 6.55 and 6.74 while for TSS (Total Suspended Solids), the values were respectively 14.9 mg/l and 7.2 mg/l, indicating improved water quality after passing through the mine. Although these figures show very high NP's, the presence of less than 7% samples with the potential to generate acidity necessitates that AMD monitoring should continue, especially in meta-sedimentary and siltstones to ensure acid generation does not arise during mining. Ghana Mining Journal Vol. 9 2007: pp. 8-16