Hall band

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As hall band , also selvage , Sahlband , cable tape , Solband , hem or Gangulme is referred to in the mining , both the upper and the lower bounding surface of a passage against the surrounding rock . The boundary area against the horizontal is referred to as the horizontal hall band and the boundary area against the hanging wall as the hanging hall band. The rule here is that both the sole and the roof do not make a proper hall band.

Basics and differences

In the case of dike deposits, the separation between the actual dike and the adjacent rock is quite different. There are deposits in which there is a clear separation between the actual mineral and the adjacent rock in the hanging and lying areas . This separation is usually very clear, so that the useful mineral has not grown together with the adjacent rock. If there is an open gap at this separation point, this is called an open separation. The hall band is then referred to as a detached hall band . Depending on the deposit , the separation points are covered with a thin layer of clay , mica , chert, talc or soapstone . If the joints are very smooth so that they mirror, the miner calls them a mirror or armor . In early mining, good armor was a sign of a rich gait. In addition to these clear delimitation areas, the last parallel parts of the corridor are often referred to as the hall band. There is no clear dividing point and the rock is often grown together. In some storage facilities, the horizontal and hanging walls run differently. In fault zones in particular, the corridor in the lying area is separated from the adjacent rock by a sharp band of rooms and gradually merges into the undisturbed rock layers in the hanging area. There are also deposits in which the duct is separated from the actual adjacent rock by a thin, lettuce layer. These transitions are called Besteg or Besteg .

Individual evidence

  1. ^ A b c Heinrich Veith: German mountain dictionary with evidence . Published by Wilhelm Gottlieb Korn, Breslau 1871.
  2. ^ A b Moritz Ferdinand Gätzschmann: Collection of mining expressions. Second substantially increased edition, Verlag von Craz & Gerlach, Freiberg 1881.
  3. ^ A b c d Carl Friedrich Richter: Latest mountain and hut lexicon. Second volume, Kleefeldsche Buchhandlung, Leipzig 1805.
  4. ↑ a b c New and well-established mineral and mining lexicon. Bey Johann Christoph and Johann David Stößeln, Chemnitz 1743.
  5. ↑ Discovered secrets or explanation of all made-up words and idioms in mines and smelters = work according to alphabetical order in two parts . Bey Johann Heinrich Kühnlein, Helmstedt 1778.
  6. ↑ Explanatory dictionary of the technical terms and foreign words that occur in mining in metallurgy and in salt works and technical articulations that occur in salt works. Falkenberg'schen Buchhandlung publishing house, Burgsteinfurt 1869.
  7. ↑ a b P. Krusch: The investigation and assessment of ore deposits. Published by Ferdinand Enke, Stuttgart 1907.
  8. ↑ a b c d e Moritz Ferdinand Gaetzschmann: Complete guide to the art of mining. First part, second edition, published by Arthur Felix, Leipzig 1866, pp. 75–76.
  9. ↑ a b Johann Christoph Stößel (Hrsg.): Mining dictionary. Chemnitz 1778.