The use of metal by the pre-Columbian Indians of South America was almost entirely confined to the western edge of the continent, where the Andes provided an abundant supply of gold, silver, and copper, and smaller amounts of platinum and tin. The first objects of metal were probably made on the Peruvian Coast and in Colombia, and each region developed a distinct type of metallurgy. That of Colombia was based on gold, and the gold-copper alloy called tumbaga. That of Perú was based on gold, silver, copper, and bronze. The processes used were similar, but the emphasis was entirely different. Variations in local style within the two regions are sufficient to differentiate the metalwork of various tribes although the technical processes are the same.