Lithograph entitled 'Dannemora Grufvor', ('Dannemora Mine'), by Baerentzen and Co after A Mayer, isued by D F Bonnier. The Dannemora mines have been producing iron ore since the 15th century. The mines are a series of around 40 deep, steep-sided quarries. The ore has a very high percentage of metal within it, sometimes as much as 90%, which enables iron and steel of very high quality to be produced from it.
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