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The western Frielinghaus open-pit tunnel is a historic tunnel in the Muttental that was part of the Frielinghaus mine. This mine was a hard coal mine in the Vormholz-Hardenstein district of Witten and was put into operation in 1771. The western open-pit tunnel was driven from the Hardenstein valley to connect the Erbstollenboden with the Muttental1. The Frielinghaus mine is now part of the Muttental mining hiking trail, which includes numerous historic mining sites and artifacts. Source: KI

The Braunschweig South Wing tunnel is a historic mining tunnel in Witten, North Rhine-Westphalia. It belongs to the former Braunschweig mine, which was in operation between 1748 and 1886. The tunnel is located near the German Mining and Field Railway Museum and the former forced labor camp Nachtigallstrasse2. The Braunschweig mine consisted of two wings, the north wing and the south wing. Mining in the south wing began in 1750 and was operated by the tradesmen Johann Peter Hundeiker and Gerhard Peter Merklinghaus. Today the tunnel is part of the Route of Industrial Heritage and a popular destination for hikes and circular walks. Source: KI

West of the branch that leads from Nachtigallstraße to Steinhausen, the Mausegatt coal seam appeared on the steep mountain slope. The coal layer was awarded on February 6, 1751 under the name Braunschweig. It sank to the south to the Borbecker Mulde and to the north to the Nachtigaller Mulde. Source: "When coal was still the future"; Gerhard Koetter, Klartext publishing house

The Frielinghaus mine in the Witten district of Vormholz-Hardenstein is a former hard coal mine. The mine was also known as the Frielinghaus Gerichts Herbede mine. From 1832 onwards, the mine was also known as the Frielinghaus Tiefbau mine, Frielinghausen mine or Frilinghausen mine. Parts of the mine are now part of the Muttental mining hiking trail. Source and link to the full article: https://de.wikipedia.org/wiki/Zeche_Frielinghaus

Coal was once made there

Information about the grotto on the Harkortberg and the bunkers that were built in the mountain can be found in official archives. But what could be more beautiful than an overgrown place whose purpose cannot be explained at first glance and which stimulates the imagination?

This daily operation creates a connection to a tunnel that the mine owner Oberste-Frielinghaus had built in 1794. The tunnel began at a depth of 13 m at the St. Johann Erbstollen and ran about 1,100 m in an easterly direction.

Quarry Dünkelberg, in this quarry the company Dünkelberg extracted clay stone for the production of bricks between 1897 and 1963.