"Teufe is the German mining term for depth. The Teufe (hT) indicates how deep a given point lies below the surface of an open-cast pit or below the ground level in the area surrounding the pit. By contrast, the height, h, refers to its distance from a reference surface ´above´. The vertical distance between the surface and a point in the mine (Grubengebäude), i.e. the vertical depth, was formerly also called the Seigerteufe. This difference is no longer made today. The terms Teufe and Seigerteufe are synonymous." - (en.wikipedia.org 10.07.2022)
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