Hard rock aggregates: Thickness and quality of geological occurrences

Hard rock aggregates play a central role particularly for the construction and maintenance of the Swiss railway network (railway ballast) as well as of high-performance roads. For further information: <a href="https://rawmaterials.swissgeol.ch/de/hartstein" target="_blank">rawmaterials.swissgeol.ch</a>. This dataset (raster cell size: 50 x 50 m) shows an estimation of the spatial distribution, the usable thickness and the quality of the hard rock-bearing geological units situated at a ground elevation lower than 1300 m a.s.l. and with a thickness exceeding 30 m. The dataset has been produced based on geological profiles, stratigraphic descriptions and through an automated workflow applied to the swissGEOCOVER2D dataset. Explanatory notes regarding the geological units considered and their characteristics can be found in the <a href="https://api3.geo.admin.ch/featureattachments/ch.swisstopo.geologie-hartsteinvorkommen/pdf/Hard_rock_catalog_2024.pdf" target="_blank">Hard rock catalog</a>. The workflow and methodology used for the compilation of the dataset are described in the <a href="https://api3.geo.admin.ch/featureattachments/ch.swisstopo.geologie-hartsteinvorkommen/pdf/Hard_rock