It is the sand in its natural form, as it is mined by the riverbed. It is the raw material of all the other building materials produced by the group. It is a material of high purity as it is mined from running water, leaching during extraction.
The material is suitable and can be used, other than raw material, for the production of other sand fractions, for the backfilling of networks, the back filling of other areas (foundation of buildings, etc.), addition to concrete, road-base or coating of other materials etc. .
Given that it has also hydraulic properties, it allows the passage of moisture without any precipitation. It is also a very hard kind of rock with wear resistance (Los Angeles 16%).