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Near the Zechenplatz in Bad Schlema, a steep reddish rock can be seen on the northeast slope. It sits on a deep tectonic fault called the Gera-Jáchymov fault (see explanatory text on geology). It is the principal tectonic feature of the region and is known as the Roter Kamm geotope. The name translates roughly as “red ridge” and derives from the presence of reddish-coloured haematite. It protrudes several metres from the surrounding terrain. Extraction of iron and manganese ore from this vein is thought to be the earliest example of mining activity in the Schlema area. Evidence of mining activity includes the 15th century mouth of the Unterer Roter Felsenstolln adit at the foot of the ridge.