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Dear Mike, Interesting location. However, what I am curious about, is whether similar 'explosive' slikensides to Derbs./Yorks. occurred elsewhere other than these areas already noted. I do not believe these are the 'only' locations - indeed, the SRMRGB ref. prev. mentioned indicates that there were other Derbs. mines nearby to those mines prev. mentioned where this phenomenon was noted - but not seemingly to the severity of the main ref. occurrences. Barites seems to be a factor in this, so therefore the SW tin areas may be eliminated... but, for example, I have never heard ref. to such occurrences at Settlingstones for example - where the vein was considerably wider. What are the factors involved with this? - how unique to Derbs. is this. Ok, we have all heard about rock-bursts in SA gold mines (& other deep mining areas), but the depths are considerably greater so there is a 'distinct' reason. If anyone would like to receive the Strahan 'article', the person who had gone to the trouble to scan it for me has said I can forward it to other interested parties. Regards, Bernard