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The largest above-ground relic of tin extraction in the Krupka district is the Große Pinge (“big sinkhole”), just below the summit of the Komáří hůrka (808 metres above sea level). Records of underground mining at this location go back to 1416. The sinkhole developed as the result of the excavation of a 140 x 45 metre greisen deposit primarily containing tin and copper ores. At roughly 75 metres deep, the depression – covering approximately 5,000 square metres – was formed by the collapse of the underlying excavated chambers. Dürrholz Adit, the most important adit in the district, has drained water from the area since the end of the 15th century. Surrounding the sinkhole were a series of other mines, including the Glatz mine. From the 1680s onwards, a whim shaft was used to extract tin and copper ore from a depth of up to 200 metres.