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Underground Iron Ore Mines In Siegerland

Because Of Subvertical Oriented Ore Bodies The Underground Mining Reached Depths Of More Than 1000 M I N Central Europe The Geothermal Gradient Is About 3 C100 M Already During Times Of Active Mining Bornhardt 1912 Reported Mine Water Temperatures 20 C At Depths Of 500 M Below Surface In The Siegerlandwieddistrict Of The

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