Stettin Mine Adit (Stettin Tunnel)

"In the upper Muttental near Witten there were two further hard coal deposits named Mausegatt and Mausegatt Unterbank below the seams Anclam and Arrival. The three men Johann Dürholt, Johann Kickut and Peter Hilby wanted to mine these and therefore put their hopes on both seams in 1770 one.
The three trades were enfeoffed on May 8th, 1772 under the new seam names Stettin and Neuglück. In 1811 the union dug a long shaft (the Wilhelmschacht), which a short time later reached the Johannes Erbstollen. The 1.40 meter thick coal bank was first brought to the surface with a reel. Then in 1830 the union put on a horse peg on the 57 Lachter deep Wilhelmschacht. In 1833, the horse owner received 19 silver groschen for mining 100 bushels of hard coal. The coal was brought south to the Bergisches Land by carters for sale. When the coal reserves under the Wilhelmschacht were exhausted in 1843, a new shaft with a length of tons was sunk 300 meters to the east. This new shaft was named Gerhardschacht and was also sunk down to the bottom of the Johannes tunnel. The mouth hole of the Szczecin conveyor tunnel shown here also dates from this time. The horse peg was also relocated and rebuilt on the new shaft. In 1845, 16 miners were employed at the Neuglück and Stettin collieries.
Six years later (1851) the coal was mined in the lent mine field of the Stettin colliery, so that the operation ended. The Göpel was torn down and sold. Today only the tunnel mouth hole reminds of the old Stettin colliery. "Source: 7grad.org/Exkursionen/NRW/Muttental/Stollen_Stettin/stollen_stettin.html

On the mining circular route, there is a board with some information at every tunnel / mine, which even many "Ruhrpottlers" did not know yet.
For this reason, it is worth stopping the hike for a moment to read up.

An old gallery which got over 200 years ago mining rights.