Gejiu or Kokiu both: gô-jēo͞o [key], town (1994 est. pop. 216,400), S Yunnan prov., China. Site of the country's largest tin reserves, it is the great tin-mining center of China, with smelters and concentrating plants. Iron and coal are also found there, and chemicals are produced. The name sometimes appears as Ko-chiu.

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