Sand pit

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Opened sand washing near Lauterbach in the Black Forest
Uhry sand pit near Königslutter , Lower Saxony

The extraction of sand from the uppermost sediment layers in open-cast mining is referred to as a sand pit , sand mill , sand pit or sand wash . The degraded materials among the mass of raw materials of the construction industry .

Suitable places for sand pits can be found in the lower reaches of wide valleys and in river plains , where the gradient of the river is already low and a large proportion of crushed stone or gravel can no longer be deposited. There are also numerous sand pits in the molasse zone of the Alpine foothills . Likewise in the North German Plain , where the Pleistocene inland ice deposited large amounts of sand and gravel.

The excavation can be done with different types of excavators , but also manually (with a shovel ) for loose sand and small quantities . In various places, archaeologists have come across sand pits from the Stone Age .

In contrast to gravel and gravel pits , sand pits do not fill so significantly with groundwater after mining has ended , because the hydrological conditions are different and the slopes are more prone to landslides than with solid rock. Notwithstanding the mining distinction is spoken in both cases of Stretch .

Drained excavation pits as well as abandoned pits are mostly of particular ecological and nature conservation interest in the - intentional as well as natural - renaturation as special locations. In addition, more attractive remains can also be used for recreational purposes.

literature

  • Jacob Stoller: Geological guide through the Lüneburg Heath. Springer Fachmedien, Wiesbaden 1918.

Web links

Commons : Sand Pits  - Collection of pictures, videos and audio files

See also