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The writer may be a caver, but given that the hole is getting "bigger all the time", it seems ill-advised for his wife(?) to be standing on that spot in the second photo! She's on a block that's already started to move. Does anybody know what kind of material is showing in the sinkhole walls? Glacial sediments?? Happy New Year to All, Woody Thompson Maine Geological Survey -----Original Message----- From: mining-history [mailto:[log in to unmask]] On Behalf Of Tanya Sent: Monday, December 30, 2013 8:41 PM To: [log in to unmask] Subject: Derbyshire sinkhole at old lead mine? http://www.bbc.co.uk/news/uk-england-derbyshire-25554549 Tanya --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com If you need to leave the list, send the following message to [log in to unmask] - leave mining-history --------- If you need to leave the list, send the following message to [log in to unmask] - leave mining-history ---------