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The great crosscourse (bricked up bit at the end) had some interesting minerals in it, some of which were Uranium related, the whole place will set your geiger counter running at about 200cps which is quite hot. Not wise to make a habit of going in there too much. Although I hear there are members of the PGC who spent some time digging out the collapse. You can identify them on a trip by their lack of caplamp. This is the place to get a "ready brek" glow.
posted by stu on 05/09/2007