The corridor of heaps and sink-holes following the line of the Schweizergang (Swiss Seam) is a typical example of the surface evidence left by the start of ore-mining activity in Jáchymov in the first half of the 16th century. The seam was discovered in 1526. Using picks, silver was reportedly found up to a depth of 80 metres. The Schweizergang was the second-most productive seam in the Jáchymov district after the Kuhgang (Cow Seam). By 1589, around 30 tonnes of silver had been extracted. The seam reached the surface just below the current road from Mariánská, just past a location known as the Abertamy Crossing. The underground route of the seam is mirrored on the surface by an impressive line of closely-spaced heaps, comprising hundreds of heaps and stretching over a distance of almost 2.5 kilometres. Many of them are associated with characteristic funnel-shaped depressions (sink-holes) which are formed by the collapsed mouths of hauling shafts. The heap and sink-hole corridor above the Schweizergang is the most extensive and coherent of such landscapes resulting from historical surface-ore extraction in the Czech Republic.