The earliest deposit, the Hermann deposit, was first mentioned in 1860 and established soon after that. It was located north of the Langenberg, where the remaining area around the opening hole is conserved nowadays. In order to reach the significant pyrolusite conglomerate beneath the Langenberg, a tunnel with a length of 187 metres was drilled. However, due to the strong mountain pressure and brittle rock, the tunnel needed further support and it was decided to extend the tunnel west- and eastwards instead. Due to unprofitability, the Hermann deposit was abandoned in 1867.