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The Grüner Graben ditch, which still carries water today and is largely preserved in its original condition, is one of the most important examples of silver and tin mining infrastructure in the Pobershau area. It exemplifies the water management systems in the Marienberg mining district. Built in the 17th century, the eight-kilometre-long, man-made ditch supplied water for the mines, ore stamp mills and ore-washing works. From the 19th century, it was used to supply water to the region’s emerging industries.