Abstract
Longbohe is a newly discovered copper mining, smelting and production site located strategically beside the Red River on the China–Vietnam border in Southeast Yunnan, China. Recent excavations have dated it from the second half of the second millennium to the end of the first millennium BC, making it the earliest copper mining and processing site in Upland Southwest China and Southeast Asia. The metallurgical production tradition in Upland Southwest China and Southeast Asia is recognized and detailed with reference to the chaîne opératoire revealed at the Longbohe site. The location of Longbohe provides evidence for a route along which metallurgy was introduced from Southwest China into Southeast Asia. Current evidence further suggests that metallurgy probably arrived on the Yunnan–Guizhou Plateau along the eastern Qinghai–Tibet Plateau corridors, and then entered Southeast Asia along south-flowing rivers. The Longbohe site is thus a most significant find in the southward dissemination of metallurgical technological systems into Southwest China and Southeast Asia in the later second millennium BC.