The corridor of heaps and sinkholes that follows the line of the Schweizergang (‘Swiss seam’) is typical of the surface remains left by early ore-mining activity in Jáchymov in the first half of the 16th century. The seam was discovered in 1526, when picks were used to excavate silver up to a reported 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 tons of silver had been extracted. The seam met the surface beneath the current road from Mariánská, just past the “Abertamy Crossing”. The underground route of the seam is mirrored on the surface by an impressive line of hundreds of closely-spaced heaps that stretches over a distance of almost 2.5 kilometres. Many of the heaps are accompanied by characteristic funnel-shaped depressions (sinkholes), formed by collapsed hauling shaft mouths. The heap and sinkhole corridor above the Schweizergang is the most extensive and continuous landscape resulting from historical surface mining of ore in the Czech Republic.