Sorry Mike, but I do not know about your example at Level Fawr.
Are both levels in the vein? The horizontal error suggests not.
If both headings were in country rock, then it looks as though they
were intended to meet end on. Sadly, surveying errors do occur
and it rather sounds as though you may have one at Level Fawr.
Am I right in thinking that Level Fawr is not too far from
Cwmystwyth and that there is an Alderson's Level in that area too.
If so, was the mine once held by the same Aldersons who were at
Cwmystwyth in the 1820s? If so, they also worked the Old Gang
Mine, where Martin Roe's Victoria Level is to be found. Perhaps
their surveyor needed a new dial.
Mike Gill
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Mike Gill
President and Recorder of the NORTHERN MINE RESEARCH SOCIETY
Britain's foremost mining history society at:-
http://www.exeter.ac.uk/~RBurt/MinHistNet/NMRS.html
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