The Grandi quarry is a quarry in the Ardey Mountains in Herdecke an der Ruhr. It is one of the last four quarries in the Ruhr area where Ruhr sandstone is extracted. In 1900, the number of quarries in Herdecke alone was 20, with a total of about 300 workers. Uses include floor coverings, cover plates, block steps, staircases, window sills, tombstones and custom-made products, up to use in stream restoration. Examples are the façade of the Werne City Museum. The Grandi farm goes back to the tunnel builder Felice Grandi from Italy, who came to Herdecke with his family in 1905. He leased the quarry; In 1945, the family acquired the quarry and runs it in the fourth generation.
Source: Wikipedia.org
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