Day opening
In the miners' language, all accesses to a mine from the day into the mine building ( underground ) are referred to as day opening . Depending on whether the route to the mine is horizontally via a tunnel or vertically via a shaft , a distinction is made between tunnel mouth and shaft opening .
Individual evidence
- ↑ When the earth suddenly breaks open - the facts about the daybreak , derwesten.de , February 1, 2013
- ↑ Mundloch , mineralienatlas.de
- ↑ Additional offer from the slate exhibition mine: Raumländer prepare pit path , Siegener Zeitung , April 16, 2016