Acid Mine Drainage Sources and Impact on Groundwater at the Osarizawa Mine, Japan

Minerals

Naoto Nishimoto¹  Yosuke Yamamoto¹  Shingo Tomiyama²  Toshifumi Igarashi²  Saburo Yamagata³ 

[1] Division of Sustainable Resources Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan;Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan;Mitsubishi Materials Corporation, 3-2-3, Marunouchi, Chiyoda-ku, Tokyo 100-8117, Japan;

关键词: abandoned and closed mine;    acid mine drainage (AMD);    water quality;    stable isotope ratio;    groundwater;   

DOI  :  10.3390/min11090998

来源: DOAJ

【 摘 要 】

Understanding the origin of acid mine drainage (AMD) in a closed mine and groundwater flow system around the mine aids in developing strategies for environmental protection and management. AMD has been continuously collected and neutralized at Osarizawa Mine, Akita Prefecture, Japan, since the mine was closed in the 1970s, to protect surrounding river water and groundwater quality. Thus, water samples were taken at the mine and surrounding groundwaters and rivers to characterize the chemical properties and environmental isotopes (δ²H and δ¹⁸O). The results showed that the quality and stable isotope ratios of AMD differed from those of groundwater/river water, indicating that the recharge areas of AMD. The recharge area of AMD was evaluated as the mountain slope at an elevation of 400–500 m while that of the surrounding groundwater was evaluated at an elevation of 350–450 m, by considering the stable isotopes ratios. This indicates that the groundwater affected by AMD is limited to the vicinity of the mine and distributed around nearby rivers.

【 授权许可】

Unknown