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Erzberg (ĕrts´bĕrkh), peak, 3,531 ft (1,076 m) high, in Styria, central Austria. Rising above the town of Eisenerz, the Erzberg is almost literally a mountain of iron. Its rich iron ore (about 35% pure iron) is mined on the surface in the summer. Some of the mines have been worked for more than 1,000 years.