I am working on a project site that is underlain by an abandoned limestone mine. We are looking at blasting out the pillars to subside and stabilize the ground surface to allow for future development. This is instead of grouting the mine as that would likely be way more costly to do so given the void height is up to 20ft. I am wondering if anyone has done this before and has any tips or read about it and has articles related to the subject.
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