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The Aschergraben is one of the most important technical achievements from the early history of mining in Altenberg. It is the oldest artificial water system in the Altenberg mining district. The artificial water course was constructed between 1452 and 1458. It ensured the water wheels and ore dressing works were supplied with water for over 500 years. The Aschergraben carried water over a distance of 7.4 kilometres from the border forests above Cínovec to Altenberg, on a downward incline of 0.3-0.6 %. After mining in the area ceased, the water from the ditch was no longer needed. Nevertheless, the Aschergraben remained a functioning water course.

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