Hydrogeochemical study of the 3M level adit drainage at the old Matsuo mine.
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概要
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The sealing plug for mine drainage is located at the penetralia part of the 3M level adit that is at the bottom of the old Matsuo mine in the northern part of Japan. In evaluating the safety of the plug concrete, a direct evaluation method would cause harm to the safety of the plug. As a consequential evaluation method, a hydrogechemical method was undertaken to compare the water quality of seepage and inflow water instead.<BR>Seepage and inflow water was identified at ten locations in the 3M level adit. Except for the water in front of the plug, the pH values of the identified water samples were in the middle range and their water qualities were characterized as Ca-HCO<SUB>3</SUB> type (within the range of unconfined groundwater). The Sr isotopic ratios (<SUP>87</SUP>Sr/<SUP>86</SUP>Srr) were between 0.7040 and 0.7044, which are close to the values of pyroxene-andesite and propyrite. These results suggest that the water qualities were affected by the andesite nearby sulfur ore.<BR>On the other hand, the pH values of the water samples in front of the plug were within the acidic range. Their water qualities were characterized by Ca-SO<SUB>4</SUB> type (within the range of acid mine drainage) and the Sr isotopic ratios in a range between those of sulfur ore and plug concrete (0.7047-0.7052). These results suggest that the origins of the water samples in front of the plug are acid mine drainage or groundwater nearby sulfur ore. In addition, high concentration of Ca is considered to be due to the dissolution of Ca from the plug concrete or calcium carbonate.<BR>It can be deduced from the hydrogechemical survey that a large part of seepage and inflow water in the 3M level adit originates in unconfined groundwater, and is hardly affected by acid mine drainage. Therefore, it can be described that the plug maintains the capability to seal mine water drainage.
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