The study sheds light on the problem of the establishment of a new foundry for processing precious metal ores and heavy mineral concentrates at Zelezna Breznica in 1752. It is based on documents from the Archive of the Court Office in Vienna, which have not been considered in expert literature up to now. An iron foundry operated at Zelezna Breznica from the 15th century to the end of the 17th century. As a result of shortage of wood and charcoal around the old foundries, new foundries were built from the beginning of the 18th century in areas with better and more easily available supplies of charcoal. Therefore, in 1751, the chief inspector of economic and forestry matters at the office of the count of the chamber in Banska Stiavnica, Imrich Rust proposed the construction of a new foundry for processing precious metal ores in Zelezna Breznica. The proposal was approved by the Court Chamber in Vienna on 18 January 1752. The construction of the foundry cost 8 333 gulden.