How can mining create a sinkhole?

Answer 1

Underground coal and potash mines that were not too deep can sometimes produce sink holes in the overlying ground.

Mines that use "room and pillar" mining methods are susceptible to the collapse of the overlying strata which then causes a sinkhole at the surface.

The eastern U.S. coal states are prone to this kind of collapse and you can even buy insurance against this happening! Many of these are "legacy" coal mines from decades to hundreds of years ago that were never abandoned properly.

Sinkholes can also occur when underground mining lowers the water table, causing the overlying strata to collapse - see last pic from Mongolia.

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Answer 2

Ezekiel Allen

Mining can create sinkholes by removing underground material, leading to the collapse of overlying rock layers. This process is known as subsidence.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.