Längenfeld (mining)

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A length field , also an extended field or a striking field , is a pit field that is restricted to a single specific deposit . The Längenfeld was the usual way of describing the spatial extent of a mining license until the 19th century . The length field relates directly to the deposit body based on its outcrop at the surface.

Basics

Originally the Längenfeld was limited to corridors , but was also used for seams in the Duchy of Kleve and the Mark .

"According to the older German mining law, the mine fields were not stretched along the surface of the earth, but formed by the body of the deposit."

- L. Mintrop

Source:

From 1821 onwards, the length field also included several seams. Since the General Mining Act for the Prussian States was passed on June 24, 1865, only square fields have been awarded in Prussia . On June 1, 1954, the "Law to clean up the length fields" was passed. Due to this law, existing length fields were converted into square fields upon request. Fields that were not requested have been deleted.

calculation

Längenfeld

According to the Kleve-Märkische Bergordnung of April 29, 1766, a length field had the following size:

  • 1 treasure trove and up to 6 to 12 dimensions,
  • 1 treasure trove and up to 20 dimensions in coal mining; this corresponded to a maximum of 602 laughs (1260 meters)
Derivation of the sizes
  • 1 Prussian treasure trove had a length of 42 laughs, that is the equivalent of 87.881 m
  • 1 Prussian measure was 28 laughs long, that is the equivalent of 58.587 m

Length field with a small crossing

The third dimension of the length field was formed by the small crossing , two levels parallel to the hanging wall and the reclining wall, each with a spacing of 3½ lights at right-a- bank level . When the deposit collapsed, it was usually allowed to expand to the so-called eternal depth .

Längenfeld with a large crossing

On July 1, 1821, a law was passed that allowed an extension of the crossing at the discretion of the Mining Authority to up to 500 people. This additional expansion was known as the Great Crossing . "It [...] was measured at right angles to be painted horizontally, up to 500 puddles in the hanging wall or lying flat or evenly distributed on both sides ...".

literature

  • Georg Agricola : Twelve books on mining and metallurgy. Fourth book on the mining fields and miners' offices. VDI-Verlag GmbH, Berlin.

Individual evidence

  1. ^ A b Heinrich Veith: German mountain dictionary with evidence. Published by Wilhelm Gottlieb Korn, Breslau 1871, p. 23.
  2. ↑ a b c G. Schulte, W. Löhr: Markscheidekunde for mountain schools and practical use. 2nd, improved edition. Springer, Berlin 1941, p. 257 ff.
  3. ↑ a b c d L. Mintrop : Introduction to mine sheath theory with a special focus on coal mining. 2nd, improved edition. Springer, Berlin 1916, p. 76.
  4. ^ Tilo Cramm, Joachim Huske: Miners' language in the Ruhr area. 5th revised and redesigned edition, Regio-Verlag, Werne 2002, ISBN 3-929158-14-0 .
  5. ^ A b Gottfried Schulte, Wilhelm Löhr, Helmut Vosen: Markscheidekunde for study and operational practice. 4th, revised edition. Springer, Berlin / Heidelberg / New York NY 1969, p. 424 ff.
  6. ^ R. Willecke, G. Turner: Grundriß des Bergrechts. 2nd revised and expanded edition, Springer-Verlag Berlin-Heidelberg-New York, Berlin 1970.
  7. ↑ Joachim Huske : The coal mine in the Ruhr area. Data and facts from the beginning to 2005 (= publications from the German Mining Museum Bochum 144). 3rd revised and expanded edition. Self-published by the German Mining Museum, Bochum 2006, ISBN 3-937203-24-9 , p. 23.