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Many of the oldest mines weren't carefully mapped, or the old maps are lost. So in many cases it's not even possible to trace where the mine tunnels were originally dug and covered up.
Since most of those old mines went out of use 100 or so years ago, there have been subsidence, cave-ins, lime deposits dissolving and refreezing, etc. It's really a nightmare what can go wrong on property that might look safe but really isn't.
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