The vast expanse of Central and North Asia is rich in mineral resources of many kinds, which are extracted for use by the inhabitants of the area as well as those of lands far away. By the fourth millennium B.C., lapis lazuli from Badakhshan in Afghanistan is imported into Mesopotamia, and jade found in a royal Chinese tomb of the second millennium B.C. comes from Xinjiang. In the second millennium B.C., the people of the Andronovo culture are making their bronzes from copper and tin, which they mine from sources from the Urals to Tajikistan. Recently rediscovered tin mines contain pottery from both the Andronovo culture and the Bactrian-Margiana Archaeological Complex, suggesting that trade in ores or metal ingots was wide-ranging in the early centuries of the second millennium B.C. In this period, ceramic traditions generally are relatively local, while, over the whole expanse of North and Central Asia, as well as in bordering areas, various new metal complexes are more widely spread. Agricultural production becomes more extensive over the millennium.