Modrá Kotva (Blue Anchor) is not only a village near Olovi (Lead Town), but also the name of this place in the forest near Hřebeny, reminiscent of an Indian camp. There's even a carved totem pole.
At the village of Modrá Kotva (Blue Anchor) - you will come across several remains of medieval underground mining - pits, buried tunnel entrances, overgrown waste heaps, etc. In this way, you can gradually walk through relatively difficult terrain to the center of local ore mining - the "Maria Opferung" and "Florian" tunnels. If you go further, after a few kilometers you will reach the center of medieval ore mining, west of Bleistadt.
Nestor, the Czechoslovak mineralogist Jan Hus Bernard, in his work "Mineralogy of Czechoslovakia" classifies the local deposit area as a West Bohemian mineralogenic area (formed by inorganic processes). It is possible to determine more precisely that the ore deposits located around the towns of Bleistadt (Olovi), Pichlberg (Bouší) and Rothau (Rotava) are located on the border with another mineralogenic area - the Ore Mountains and the Slavkov Forest. H. Bernard classifies the local veins as a hydrothermal ore-mineral formation p-pol (late polymetallic), i.e. a formation with the occurrence of lead and zinc ore (possibly including silver or copper ore). The Bleistadt area is the most famous area with p-pol formation in the western Ore Mountains. Several ore veins were found in this area. According to the direction of the veins, we can determine that here mainly the midnight walks (north - south) and morning walks were represented.
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