Not exclusively mining these are also found in old houses and are often
refered to as witch stones and were said to be used to ward off evil.
Martin Roe
Lead Mining in the Yorkshire Dales
http://www.mroe.freeserve.co.uk
The Industrial Heritage of Calderdale
http://www.halifaxcouriertoday.co.uk/ftpinc/calderheritage
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