The remains of the ferrous metallurgy and handicrafts center based on iron from the oldest Brnjica cultural group stage (the 14th-13th centuries BC) were discovered in one part of the archaeological Hisar site in Leskovac; found are: millstones (several hundreds), smelting furnaces (dozens), charcoal pits, air blowing ceramic pipes, slag, amorphous iron, bloom and other ferrous artefacts.