basalt quarry, Germany, North Rhine-Westphalia, Siebengebirge

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Keywords: ., basalt, central, deposit, deposits, derder, europe, european, extraction, format, general, geology, german, germany, horizontal, igneous, mineral, mining, north, nrw, open, opencast, outcrop, outcrops, overview, pit, pits, quarries, quarry, resource, resources, rhine-westphalia, rhine-westphalian, rock, rocks, siebengebirge, stone, stones, strip, surface, view, volcanic, west, western