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首页> 外文期刊>Applied Geochemistry: Journal of the International Association of Geochemistry and Cosmochemistry >Estimation of potential pollution of waste mining dumps at Pena del Hierro (Pyrite Belt, SW Spain) as a base for future mitigation actions
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Estimation of potential pollution of waste mining dumps at Pena del Hierro (Pyrite Belt, SW Spain) as a base for future mitigation actions

机译：估计Pena del Hierro（西班牙西南黄铁矿带）的废渣场的潜在污染，以此作为未来缓解行动的依据

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Pena del Hierro is an abandoned mine site located in the catchment area of the Tinto river (Pyrite Belt, SW Spain). As leaching from the spoils affect the quality of the stream water, the waste dumps have been characterized for mineralogy, geochemistry and granulometry to obtain an estimate of the potential pollution. Waste rock dumps in Pena del Hierro are very heterogeneous and are mainly composed of acid volcanic tuffs > gossan > shales > roasted pyrite ashes > floated pyrite. The volcanic tuffs, the gossan and the shales coexist in the same piles. The roasted pyrite ashes and the floated pyrite form more homogeneous dumps. The dissolution of pyrite concentrated in pyrite ashes and floated pyrite units can generate acid mine drainage. Nevertheless, acid volcanic tuffs, which are rich in pyrite and have no neutralizing minerals, are the main source of these acidic effluents. Only muscovite might partially neutralize the acidity, but the dissolution of this mineral is too slow to compensate for acidity. The occurrence of jarosite in the < 2 mm fraction indicates that extreme acid mine drainage occurs. The gossan and roasted pyrite ashes have high contents of trace elements. According to their concentration, As (46-1710 ppm), Pb (113-3455 ppm) and Hg (0-53) are some of the most important toxic trace elements in these wastes. In dumps mainly composed of volcanic tuffs most of the trace elements derive from the gossan mixed in the piles. Gossan is stable in an oxidizing environment, but acidic effluents (pH < 2) can dissolve Fe oxyhydroxides from them and release high amounts of trace elements to the stream water. This research contributes to estimating the production of acid mine drainage and the actual contamination risk of potentially toxic elements in soils and waters of this area, and could be the base for possible future mitigation actions in other areas affected by mining wastes. (c) 2006 Elsevier Ltd. All rights reserved.
机译：佩纳·德尔·耶罗（Pena del Hierro）是位于廷托河（西班牙西南黄铁矿带）集水区的一个废弃矿山。由于弃土中的浸出物会影响溪流水的质量，因此对废料堆进行了矿物学，地球化学和粒度分析等表征，以估算潜在污染。 Pena del Hierro的废石堆非常异质，主要由酸性火山灰>戈桑>页岩>烤黄铁矿灰>浮黄铁矿组成。火山凝灰岩，戈桑和页岩共存于同一堆中。烧成的黄铁矿灰和浮起的黄铁矿形成更均匀的堆放物。集中在黄铁矿灰烬中的黄铁矿的溶解和漂浮的黄铁矿单元会产生酸性矿山排水。然而，富含黄铁矿且没有中和性矿物的酸性火山凝灰岩是这些酸性废水的主要来源。只有白云母可以部分中和酸度，但是这种矿物质的溶解太慢而无法补偿酸度。在小于2 mm的部分中出现黄钾铁矾表明发生了极端的酸性矿井排水。戈桑和烤黄铁矿灰中的微量元素含量很高。根据它们的浓度，砷（46-1710 ppm），铅（113-3455 ppm）和汞（0-53）是这些废物中最重要的有毒微量元素。在主要由火山凝灰岩组成的垃圾堆中，大多数痕量元素来自混合在堆中的戈桑。戈桑在氧化环境中稳定，但酸性流出物（pH <2）可以溶解其中的羟基氧化铁，并向水流中释放大量痕量元素。这项研究有助于估算酸性矿山排水系统的生产以及该地区土壤和水体中潜在有毒元素的实际污染风险，并且可能是未来受采矿废物影响的其他地区采取减缓行动的基础。 （c）2006 Elsevier Ltd.保留所有权利。

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