Dear David,
To my knowledge I have never heard of such. Mind you, if the work area was
clean the it could be possible, but in all the hardrock & other mines I have
been in, I would not have liked to be barefooted. As to overseas, I am sure,
in certain countries, it was (& probably still is), commonplace in small mine
workings. Brazil I know is one case as an example. You probably know all this
anyway, but hope it might be of some use.
Regards, Bernard
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