Bibersberg Quarry Ruins

The Bibersberg is in the inner Fichtelgebirge high plateau a forested granite mountain with a height of 597 m above sea level. NN.
Porphyry granite was once mined in two abandoned quarries on the western slope. They belong to the protected geotopes. The Bibersbach forms an narrow valley with granite rock formations, one of which is called the royal seat.
Source and further information
de.wikipedia.org/wiki/Bibersberg

There are two abandoned quarries in the Weißenstadt-Marktleuthener granite directly on the Marktleuthener FGV circular hiking trail No. 2. In between lies the Königsstuhl, a larger group of rocks made of the same rock. The northern quarry was operated by the Jacob Company from 1892 until the mid-1970s. The material from this quarry was marketed under the name "Bibersberg-Granit". In the lower part of the site there are many different hewn and polished workpieces made of different varieties of granite.
Source: Environmental Atlas of Bavaria