What was it like in the FOD? (General)
they are not deep ones with deep shafts and windlasses like the ones in South Wales were
Whilst a number of the Gales were mined as small simple operations, some mines were large / deep -- i.e. Northern United, Princess Royal, and quite a few had significant Headframes - i.e. Lightmoor, Trafalgar etc
Ian Pope's
http://www.lightmoor.co.uk/forestcoal/Coalopen.html
may help
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Ἀριστοτέλης A Gloster & Hereford Boy in the Forest of Dean ><((((*>