The wastewater from the abolished mine tends to be warmer than the water flow of river like hot spring but it also tends to contain poisonous arsenic, so can't be used for hot spring spa without analysis.
The artificial marsh that treated the acidic wastewater from the abolished mine was covered with snow and the plants like reed could not absorb heavy metal in them. The slaked lime worked out to neutralize the acidic wastewater in winter.
Even after abolishing the mine, the wastewater continues to flow out of the shaft of the mine forever. Yes, even after our deaths in this world, it will continue to flow out. The responsibility to keep the water flow of the public area is so heavy.
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