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Lead ore is usually found in long, narrow veins. These contain crystalline minerals, deposited in steeply sloping or vertical fault fissures between two walls of rock. For most of their lengths, veins are covered by barren rocks or glacial clay, but the early miners worked them wherever they outcrop. (More on the minerals commonly found in theYorkshire Dales) |
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Mineral Vein, Cononley Mine, Airedale |
What features are associated with extraction? |
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