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首页> 外文期刊>South African Journal of Geology: Being the Transaction of the Geological Society of South African: Syndie die Verhandelinge van die Geologiese Vereniging van Suid-Afrika >An assessment of the geochemical impacts of greenfields mining projects in South Africa on both sides of the mine drainage pH divide - A geochemical modelling approach
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An assessment of the geochemical impacts of greenfields mining projects in South Africa on both sides of the mine drainage pH divide - A geochemical modelling approach

机译：矿区排水PH划分两侧南非绿色田矿业项目对绿色野营项目的地球化学影响 - 一种地球化学建模方法

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Environmental geochemical risk assessments have become a routine practice in the environmental evaluation of most greenfields and brownfields mining and mineral processing related projects. Brownfields projects, e.g. extension of an existing tailings facility, usually have timeseries monitoring data which can be used in the risk assessment. The greenfields scenario is more complex in that very little, if any, existing data is available, thus often requiring follow-up studies. In terms of the assessment of environmental geochemical risks from leachate from mineral waste facilities, there is, at least in some circles, a prevailing misconception that acidic conditions cause environmental impacts due to leaching of contaminants from mineral waste facilities, while neutral to alkaline conditions does not. This paper is aimed at in identifying a decision strategy to guide project managers in determining when follow-up studies specifically for greenfields mineral waste generating projects is warranted and also addresses the notion of pH being an indicator of risk. These two aspects will be addressed by applying numeric geochemical modelling, which takes geochemical processes over time into account to determine likely impacts from mineral waste Tailings from two types of ore will be considered. The first is an acid producing tailings material from the Witwatersrand gold mining basin, while the second is tailings material from a Fluorspar mining project (non-acid producing Both types of tailings contain iron sulphides which have the potential to produce acid mine drainage. The difference is the host geology of the two deposit types, with the Fluorspar ore associated with and located in dolomitic lithologies. Even though the Fluorspar tailings is likely to generate a neutral leachate from the tailings, it also contains SO_4~(2-) and As in concentrations exceeding regulatory guideline values. This demonstrates that even though a mineral waste facility may have circum neutral p
机译：环境地球化学风险评估已成为大多数绿地和棕色地区矿业和矿产处理项目的环境评价中的常规实践。 Brownfields项目，例如Br​​ownfields项目。延伸现有的尾矿设施，通常具有超时监测数据，该数据可用于风险评估。 GreenFields情景在很大程度上更复杂，如果有的话，如果有的话，则通常需要进行后续研究。就矿物废物设施的渗滤液评估了环境地球化学风险而言，至少在某些圈子中，酸性条件导致含矿物废物设施的污染物的污染物引起环境影响的普遍存在的误解，而中性为碱性条件不是。本文旨在确定指导项目经理在确定专门针对格林菲尔德矿物废物的后续研究时指导项目经理的决定策略是有保证的，并且还解决了PH值的概念是风险指标。通过应用数字地球化学建模将解决这两个方面，这将随着时间的推移考虑到地球化学过程，以确定可能考虑两种类型矿石的矿物废物尾矿的可能影响。首先是酸生产尾矿材料，来自Witwatersrand Gold Mining盆地，而第二种是来自萤石采矿项目的尾矿材料（非酸生产两种类型的尾矿含有硫化物，这些硫化物具有产生酸矿喷射的硫化物。差异是两种沉积类型的宿主地质，与萤石与位于白云岩岩性的萤石矿石。即使萤石可能会从尾矿产生中性渗滤液，它也含有SO_4〜（2-）并如此浓度超过监管准则值。这表明即使矿物废物设施可能具有循环中性p

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