The development of Inca metallurgical technology is mainly manifested in the diversification of processing technology and the perfection of casting technology. The Incas knew how to process metals in various ways. Forging, stamping and inlaying processes are mainly used to make tools, such as gold and silver vessels, shafts, sickles, sticks, needles and semicircular knives. The casting skills of the Incas were superb. They use molded wax molds for casting. First, they made a model out of sediment, and then coated it with wax. After careful processing, a new layer of sediment was attached to the wax model. Leave a hole in the upper part of the model and pour the molten metal into the hole. After the wax layer melts, it flows out from the hole below, and the original position of the wax layer is occupied by metal. After cooling, the sediment model is broken and metal castings are formed. Casting is mainly used to make copper and bronze products.
The development of Inca metallurgical technology directly stimulated the development of decorative arts. They made portraits of men and women and camel statues with gold and silver. The gold statue of the sun god and the gold and silver decorations in the Sun Temple in Cuzco show the outstanding achievements of the Incas in decorative arts, and their skills are close to those of the European Renaissance. Metal decorative art is also reflected in the life of nobles. According to archaeological data, dozens to hundreds of pounds of gold and silver ornaments are often hidden in the tombs of nobles.