As far as I know quarry lakes are created over time as rainwater fills the quarry over years. What keeps an open quarry from getting filled the same way when it rains?
Please tell me if the flair is wrong, I estimated this one to be the closest fitting.
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Pumps, pumps, and more pumps. The day they decommision a mine and turn the pumps off is the day it starts filling in. Mostly it’ll be ground water though, but for sure some rain will end up in it.
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