[Rockhounds] Giant Sinkhole Opens Up In South Dakota and Exposes Abandoned Mine

[gary brown]

I was a member of the Paha Sapa Grotto while a GeolE student at SD Tech in the late  60's.  They are about as pro-level as you can get and still be amateurs.  

gcb

-----Original Message-----
From: Rockhounds <rockhounds-bounces at rockhounds.drizzle.com> On Behalf Of Kreigh Tomaszewski
Sent: Saturday, June 20, 2020 9:08 AM
To: Rockhounds at drizzle.com: A mailing list for rock and gem collectors <rockhounds at rockhounds.drizzle.com>
Subject: [Rockhounds] Giant Sinkhole Opens Up In South Dakota and Exposes Abandoned Mine

About a dozen houses in Black Hawk, South Dakota, were evacuated after a sinkhole opened under the Hideaway Hills development. The ground started to give way on the 27th of April and while it has left a lot of uncertainty for the locals, the situation has led to a unique discovery. The residential homes were built over an abandoned gypsum mine.

The authorities are already trying to figure out how this could’ve happened but in the meantime, explorers of a local caving group called *Paha Sapa
Grotto* decided to take a look inside.

The *Paha Sapa Grotto* is a subchapter of the National Speleological Society and is a world leader in caving science, exploration, and conservation. “When we heard about the sinkhole, we knew it was on a geological unit that could potentially have caves in it,” Nick Anderson, a member of Paha Sapa Grotto, told *Bored Panda*. “We also knew that county emergency management wouldn’t have much experience in this area so we offered to help to determine the scope of the problem.”

https://www.boredpanda.com/sinkhole-south-dakota-black-hawk-old-gypsum-mine/
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