>.. careful with O.S. maps showing shafts, shake holes, mine sites etc. A
2500 map (25" to the mile) will be reasonably accurate but the depiction and
description of features may well have depended on the individual surveyor
with little knowledge of mining but a pre-occupation in getting the job
completed then scurrying back to the office to thaw out over a cup of tea!!
Don't put too much credit on he comment "air shaft" or "trial pit" the
surveyor may not have know the history and just put down what he thought it
was.
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