At the end of the 18th century, the name Martin Römer had become to be used for the most important adit in the Hoher Forst. At the end of 1817, the Martin- Römer-Tiefer-Erbstolln (adit) was closed down and the shafts were boarded up. In the course of time they collapsed, creating sink-holes. Recent decades have even seen the creation of new sinkholes, and the enlargement of existing ones. In the 1930s, the later Martin-Römer mining claim in the Hoher Forst was descended as part of prospecting works for wolframite deposits. The prospecting works resulted in the discovery of tungsten ores in two places, where upon mining was started. On 1st August 1945, operations were closed down.
The mouth of the Martin Römer adit is situated in the south-western part of the mining landscape. Constructed in 1807, it is 1 m high and approx. 0.60 m wide. The first part of the adit was lined with granite blocks for a length of approx. 8.5 m.