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Updated: May 26, 2025
A hundred years ago the Kielce mines produced nearly 4,000 tons of copper a year. Brown iron ore is also found here in deposits 40 per cent pure, while there are also veins of zinc sometimes 50 feet thick, yielding ore of 25 per cent purity. Sulphur, one of the ingredients for the manufacture of explosives, is found at Czarkowa in the district of Pinczow.
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