Between 1529 and 1533, shortly after the founding of Jáchymov, three new important mining towns appeared almost simultaneously in the upper reaches of the Erzgebirge: Abertamy (Abertham), Boží Dar (Gottesgab) and Horní Blatná (Bergstadt Platten). The reason behind this was the rich discoveries of silver, tin and iron ores in the near vicinity. Abertamy with its neighbouring mining settlement Hřebečná (Hengstererben) was built on Bohemian territory. Horní Blatná and Boží Dar, on the other hand, were founded by the Saxon Elector John Frederick on previously undeveloped land and only incorporated into the Kingdom of Bohemia in 1546.
Horní Blatná is one the most striking examples of Renaissance-style planned mining towns in the Erzgebirge. Similar to Marienberg, its distinctive features are a large, central, almost square marketplace, dominated by the Church of St. Lawrence, and a system of roads running perpendicular to each other.
The ore districts Horní Blatná, Hřebečná and Bludná (Irrgang) bear witness to 400 years of tin ore mining. Overground, a series of notable objects are preserved, including Vlčí Jámy sinkhole and Ledová Jáma sinkhole on the summit of Blatenský vrch (Plattenberg), the sinkhole of Susanna mine in Bludná, and the Schneppova sinkhole in Hřebečná. Worthy of special mention is the sinkhole of the Red Mine in Hřebečná, which measures over 230 m and is one of the largest of its kind internationally. From the perspective of mining history, the underground section of the Mauritius mine in Hřebečná is of great value. There, authentic evidence for a wide variety of tin ore mining processes from the 16th to the 19th century is preserved. In the skarn district Zlatý Kopec (Goldenhöhe), where tin, iron, copper and zinc ores were mined, clear evidence of underground ore extraction is preserved. A unique element of the local mining landscape are the heaps near Boží Dar, which bear witness to the enormous scale of cassiterite mining by placer work in the highest reaches of the Erzgebirge. The man-made ditch Blatenský příkop, still fully functional today, can be considered one the most significant mining water supply systems in the Czech part of the Erzgebirge.