Carter County has numerous small deposits of brown iron ore ( limonite ), and some effort has been made in the past to mine them, but the efforts have generally not been cost effective.
2.
The gallery built in 1910 11 runs through two natural caverns, the first being opened up as a new section, the Yellow Climb ( " Gelben Stieg " ), a former space largely filled with brown iron ore that had probably been excavated in the 16th century.
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