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Miners at work in Boltsburn Lead Mine, Rookhope, Bishop Auckland (1930). The picture shows a mineral vein, a hole being drilled for explosives, and a jumper bar in foreground.

Image: (c) Beamish, The Living Museum of the North.

Photo Number 17528. Used with permission.

(Lytebox viewer by Markus F. Hay, 2006-2012 CC BY)