RMK Kies AG operates the Grosszelg project for the extraction and processing of gravel and sand to supply aggregates for the construction sector. The project foresees staged extraction with planned backfilling and recultivation, local processing, traffic access arrangements and measures to control emissions and noise. RMK Kies is an interest group composed of the regional companies Merz, Knecht and Richi.
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Gravel extraction in the Grosszelg area in Birmenstorf, with planned output of around 145'000 m³ per year, phased over five sections and followed by backfilling.
Sand extraction
Sand extraction as part of the material extraction in the Grosszelg project, complementing the gravel extraction and serving regional supply of building materials.
Backfilling and land reclamation
Backfilling with clean excavated material, land reclamation of the extraction areas and gradual return to agriculture.
Regional supply of gravel and excavated material storage
Ensuring regional supply of gravel as well as backfill volumes for unpolluted excavated material in the Baden–Brugg–Limmattal area.
Ecological compensation
Ecological compensation measures during extraction, including connecting habitats, wildflower strips, field margins and biodiversity promotion areas.