Post tunnel, path to the underground pond.

    The first part of the story about the Postal tunnel near Zlaté Hori got a bit swollen, so I hope that its continuation will be aimed a little more precisely at the tunnel itself. In the first part, I introduced polymetallic and complex ores. However, this description probably won't say much to most people. Ores are rocks that have a certain "potential" for obtaining (mining) interesting elements, i.e. primarily metals. Monometallic are…