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

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Geochemical characteristics of ores and surface waters for environmental risk assessment in the Pinpet iron deposit, southern Shan State, Myanmar
Resource Geology ( IF 1.1 ) Pub Date : 2020-02-26 , DOI: 10.1111/rge.12231
Kyaw Zay Ya _{1,

2} , Tsubasa Otake ₁ , Aoi Koide ₁ , Kenzo Sanematsu ₃ , Tsutomu Sato ₁

Affiliation

Funding information Japan International Cooperation Agency, Grant/Award Number: KIZUNA program; Japan Society for the Promotion of Science, Grant/Award Number: KAKENHI (17H03502) 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 hazardouselement 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 Received: 21 October 2019 Revised: 8 January 2020 Accepted: 10 January 2020

中文翻译：

缅甸掸邦南部 Pinpet 铁矿床矿石和地表水的地球化学特征用于环境风险评估

资金信息日本国际协力机构，赠款/奖励编号：KIZUNA 计划；日本科学促进会，资助/奖励编号：KAKENHI (17H03502) 摘要 Pinpet Fe 矿床是缅甸第二大铁矿床，目前已暂停采矿作业，部分原因是可能受到重金属污染和有害元素（例如，Fe、As、Cu、Zn 和 U）进入周围的水生环境和相关的公众关注。然而，尚未对矿床附近河流中的污染源和污染程度进行科学调查。因此，我们量化了河床中河水和沉积物的重金属和有害元素浓度，并使用顺序提取方法测量了沉积铁矿中这些金属的形态和浓度，以更好地了解采矿活动对周围环境的影响。Nan-tank-pauk 流及其支流的地球化学结果表明，其水域的化学成分受碳酸盐基岩的控制，并且未因采矿活动或湿法或湿法中的赤铁矿和褐铁矿选矿过程而发生可检测的污染。旱季。所有测量的重金属和有害元素浓度均低于世界卫生组织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整体化学成分表明，As、Zn、和铜浓度与未受污染的沉积物相似。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 As（高达 2 wt%）。然而，连续提取结果表明，这些富含砷的矿石中的大部分 (>90%) 砷存在于不溶性部分（例如，结晶的氢氧化铁和粘土）中。因此，不太可能收到砷收到日期：2019 年 10 月 21 日修订日期：2020 年 1 月 8 日接受日期：2020 年 1 月 10 日结晶氢氧化铁和粘土）。因此，不太可能收到砷收到日期：2019 年 10 月 21 日修订日期：2020 年 1 月 8 日接受日期：2020 年 1 月 10 日结晶氢氧化铁和粘土）。因此，不太可能收到砷收到日期：2019 年 10 月 21 日修订日期：2020 年 1 月 8 日接受日期：2020 年 1 月 10 日

更新日期：2020-02-26

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