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A crossed circle marking a vertical shaft.
Also known as: Shaft symbol mining, Vertical working symbol
On a geological map a mine shaft is drawn as a small crossed circle, marking a vertical opening driven down to reach a worked seam or lode.
Appears on maps long after a working has closed, since a disused shaft remains a ground stability consideration whether or not it is still open.
Contexts: Maps
A small circle with a cross drawn through it, placed at the shaft head.