Geochemical characteristics of ores and surface waters for environmental risk assessment in the Pinpet iron deposit, southern Shan State, Myanmar

IF 1.1 4区 地球科学 Q3 GEOLOGY
Resource Geology Pub Date : 2020-02-26 DOI:10.1111/rge.12231
Kyaw Zay Ya, T. Otake, A. Koide, K. Sanematsu, Tsutomu Sato
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引用次数: 4

Abstract

Mining operations in the Pinpet Fe deposit, which is the second‐largest Fe deposit in Myanmar, are currently suspended, in part because of possible contamination of heavy metals and hazardous elements (e.g., Fe, As, Cu, Zn, and U) into the surrounding aquatic environment and associated public concern. However, a scientific investigation of the source and degree of contamination in streams near the deposit has not yet been conducted. Therefore, we quantified heavy‐metal and hazardous‐element concentrations of stream waters and sediments in stream beds, and measured the speciation and concentration of these metals in deposit Fe ores using the sequential extraction method, to better understand the influence of mining activities on the surrounding environment. Geochemical results for Nan‐tank‐pauk stream and its tributaries indicate that the chemical compositions of their waters are controlled by carbonate bedrock and that no detectable contamination has occurred as a result of mining activity or hematite and limonite ore beneficiation processes in either the wet or dry seasons. All measured heavy‐metal and hazardous‐element concentrations were below the World Health Organization standards for drinking water and the proposed national drinking water quality standards in Myanmar. Bulk chemical compositions of stream‐bed and tailings dam sediments show that As, Zn, and Cu concentrations are similar to those in uncontaminated sediments. Results of bulk mineralogical and chemical analyses of ore samples reveal that some limonite ore samples contain substantial amounts of As (up to 2 wt%). However, sequential extraction results indicate that most (>90%) of the As in these As‐rich ores is hosted in insoluble fractions (e.g., crystalline Fe hydroxides and clays). Therefore, arsenic is unlikely to be released into the aquatic environment by interacting with water during ore beneficiation processes should the mine resume operations.
缅甸掸邦南部Pinpet铁矿矿石地球化学特征及地表水环境风险评价
Pinpet铁矿是缅甸第二大铁矿,目前暂停了采矿作业,部分原因是重金属和有害元素(如铁、砷、铜、锌和铀)可能污染周围的水生环境,并引起公众的关注。然而,尚未对该矿床附近溪流的污染来源和程度进行科学调查。因此,为了更好地了解采矿活动对周边环境的影响,我们对河流水体和河床沉积物中重金属和有害元素的浓度进行了量化,并采用顺序提取法测量了这些金属在矿床铁矿石中的形态和浓度。Nan - tank - pauk溪流及其支流的地球化学结果表明,其水的化学成分受碳酸盐基岩控制,并且在湿季或旱季都没有由于采矿活动或赤铁矿和褐铁矿选矿过程而发生可检测到的污染。所有测量的重金属和有害元素浓度均低于世界卫生组织的饮用水标准和缅甸拟议的国家饮用水质量标准。河床和尾矿坝沉积物的体积化学组成表明,As、Zn和Cu的浓度与未污染的沉积物相似。矿石样品的大量矿物学和化学分析结果表明,一些褐铁矿样品含有大量的砷(高达2 wt%)。然而,连续提取结果表明,这些富砷矿石中的大多数(>90%)砷以不溶性组分(如结晶铁氢氧化物和粘土)存在。因此,如果矿山恢复生产,在选矿过程中砷不太可能通过与水的相互作用释放到水生环境中。
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来源期刊
Resource Geology
Resource Geology 地学-地质学
CiteScore
2.30
自引率
14.30%
发文量
18
审稿时长
12 months
期刊介绍: Resource Geology is an international journal focusing on economic geology, geochemistry and environmental geology. Its purpose is to contribute to the promotion of earth sciences related to metallic and non-metallic mineral deposits mainly in Asia, Oceania and the Circum-Pacific region, although other parts of the world are also considered. Launched in 1998 by the Society for Resource Geology, the journal is published quarterly in English, making it more accessible to the international geological community. The journal publishes high quality papers of interest to those engaged in research and exploration of mineral deposits.
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