| | Rocks & Minerals: Fluorite from the Northern Pennines Orefield England (Site not responding. Last check: 2007-10-21) |
 | | During the past several centuries, numerous mines and prospects in the Northern Pennine Mountains, centered on the Weardale area of northern England, have yielded enormous amounts of both lead and, later, fluorite ores. |
 | | Though there are literally hundreds of mines and prospects in the Northern Pennines that may have produced an occasional specimen, the focus here will be those mines that have yielded a large enough body of quality specimens that one is likely to find examples in modern collections or on the mineral-specimen market. |
 | | Lead mining reached its greatest levels in the Northern Pennines during the eighteenth and nineteenth centuries when two major companies came to dominate the local industry. |
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