The deposit - A gift of nature
The deposit is
situated in the so-called Upper Cretaceous Beienrode Basin in the eastern
part of Lower Saxony near Königslutter.
The basin is
closely connected with salt-tectonic activities leading to the formation of
a mushroom-shaped salt dome, known as Beienrode diapir. On its flank a basin
was formed, which served as a sediment trap consolidating both marine and
fluviatile sediments over a period of many million years.
About 70 million
years ago the sea slowly regressed and the environment changed from marine to
continental conditions resulting in the formation of a coast line. A river
that carried its cargo from southeast deposited the sediment in a branched estuary.
Quartz is known
to be a very hard mineral, and thus more resistant than other minerals.
Therefore, high-grade quartz sand with rounded grains was enriched during the
rolling fluvial transport of onetime rough and quartz rich material that was
broken down by processes of weathering and erosion far away in the outback.
was subtropical during and after sedimentation, which caused the remaining potassium
feldspar to weather to kaolinite by means of hydrolysis.
Kaolinite is a secundary clay mineral, which is still present in the finest
fraction of the raw sand until now. It is washed out during the preparation process.
The extreme whiteness of the sand is attributed to former natural dissolution
processes, in which probably humic acids were involved. As a result iron was
leached from the sand and taken away.
Technique in conformaty with nature
applied techniques are pure physical preparation procedures, which were improved
by research and development activities and large-scale test work to such a high
level that flotation chemicals, acids, or other auxiliary agents are entirely