Even after abolishing metal mines, the wastewater from the shaft or gallery will continue to flow out. Most of them are acidic and contains arsenicals. They affect the environment including ocean and prevent rice crops from growing.
The wastewater should be neutralized with calcium carbonate and dehydrated precipitate will be carried to the mountains. The drain system should be arranged around the mountains of debris to avoid the rainfall eroding the accumulated debris and damaging the water flow of lower side.
The accumulated debris will soon covered with plants and become more stable as long as the artificial drain systems work well. But once the U-shaped gutter was broken, the rainfall and drain water will erode the debris. It takes so long time and much money to treat the wastewater after a mine is developed.
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