Now I think about it, it's likely it wasn't Broomhill workings; because he would be familiar with uncovering those all over the place and at different levels, more likely he's mentioned these workings because it was something different and unexpected. Could be some 17th /18th century operation at Woodside perhaps??
I'll have to double check but I think it did not become a requirement to to permanently record abandoned workings until the 1870s or 80s so anything before that can be lost and the opencast operator could be unaware of old workings until they actually uncovered them.
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