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I would have thought it could be one of two things, robbing coal from pillars in Room and Pillar working, or robbing coal from the bounderies, ie under cities where it was forbidden. Removing pillars was always called pillar extraction when I worked in Room and Pillar workings. I did read somewhere that it was common under private ownership before the 1900's that "removing" a little from the pillars was common. Dangerous practice as it weakened them, with the risk of heavy convergence of the workings. John Waudby __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com