Departamento de Explotación y Prospección de Minas, Universidad de Oviedo, ETS Ingenieros de Minas, Independencia, 13 E-33004 Oviedo, Spain.
J Hazard Mater. 2010 Apr 15;176(1-3):323-32. doi: 10.1016/j.jhazmat.2009.11.031. Epub 2009 Nov 13.
Systematic monitoring of surface waters in the area of abandoned mine sites constitutes an essential step in the characterisation of pollution from historic mine sites. The analytical data collected throughout a hydrologic period can be used for hydrological modelling and also to select appropriate preventive and/or corrective measures in order to avoid pollution of watercourses. Caudal River drains the main abandoned Hg mine sites (located in Mieres and Pola de Lena districts) in Central Asturias (NW Spain). This paper describes a systematic monitoring of physical and chemical parameters in eighteen selected sampling points within the Caudal River catchment. At each sampling station, water flow, pH, specific conductance, dissolved oxygen, salinity, temperature, redox potential and turbidity were controlled "in situ" and major and trace elements were analysed in the laboratory. In the Hg-mineralised areas, As is present in the form of As-rich pyrite, realgar and occasionally arsenopyrite. Mine drainage and leachates from spoil heaps exhibit in some cases acidic conditions and high As contents, and they are incorporated to Caudal River tributaries. Multivariate statistical analysis aids to the interpretation of the spatial and temporary variations found in the sampled areas, as part of a methodology applicable to different environmental and geological studies.
对废弃矿山地区的地表水进行系统监测，是对历史矿山污染特征进行描述的重要步骤。在整个水文周期收集的分析数据可用于水文学建模，也可用于选择适当的预防和/或纠正措施，以避免污染水道。Caudal 河位于西班牙西北部阿斯图里亚斯中心（Mieres 和 Pola de Lena 区），是主要废弃汞矿（Hg mine sites）的所在地。本研究描述了对 Caudal 河流域内 18 个选定采样点的物理和化学参数进行的系统监测。在每个采样点，“原位”监测水流、pH 值、电导率、溶解氧、盐度、温度、氧化还原电位和浊度，并在实验室中分析主要和微量元素。在汞矿化区，砷以富含砷的黄铁矿、雄黄和偶尔的砷黝铜矿形式存在。矿山排水和废石堆浸出液在某些情况下呈酸性，且含有高浓度的砷，这些物质被汇入 Caudal 河支流。多元统计分析有助于解释采样区域的空间和时间变化，这是一种适用于不同环境和地质研究的方法的一部分。
