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Boltsburn Mine and Washing
Boltsburn Mine is one of the best known mines in the North Pennines. This is partly because of the very rich lead
deposits discovered in 1892, but mainly because of the quality of the fluorspar crystals, which can be seen in
museums all over the world.
Boltsburn was also the site of an important ore washing plant. Lead ore was separated from the other minerals by
using its relatively high density. The ore was crushed and the fragments were sorted by a series of sieves into
different rise functions. A variety of equipment using water were then used to separate the heavy lead ore from
the lighter waste or gangue materials. The types of equipment included jiggers, buddles and dollytubs.
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