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

Ya, Kyaw Zay; Otake, Tsubasa; Koide, Aoi; Sanematsu, Kenzo; Sato, Tsutomu

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

Ya, Kyaw Zay; Otake, Tsubasa; Koide, Aoi et al.

Resource geology, 2020, 70(3), 296-308

Permalink : https://hdl.handle.net/2115/78976

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アクセス権	open access
URI	https://hdl.handle.net/2115/78976
タイトル	Geochemical characteristics of ores and surface waters for environmental risk assessment in the Pinpet iron deposit, southern Shan State, Myanmar
著者	Ya, Kyaw Zay ; Otake, Tsubasa ; Koide, Aoi ; Sanematsu, Kenzo ; Sato, Tsutomu
著者名 Ya, Kyaw Zay
e-Rad_Researcher 80544105 著者名 Otake, Tsubasa
著者名 Koide, Aoi
著者名 Sanematsu, Kenzo
e-Rad_Researcher 10313636 著者名 Sato, Tsutomu
言語	英語
キーワード	arsenic
	environmental impact
	heavy metals
	iron mine
	limestone bedrock
	Myanmar
	Pinpet
	sequential extraction
発行日	2020-07
出版者	John Wiley & Sons
収録物名	Resource geology
巻(号)	70(3)
ページ	296-308
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution 4.0 International
権利情報	The definitive version is available at wileyonlinelibrary.com.
PISSN	1344-1698
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1111/rge.12231