There are two kinds of copper factories, one is smelting, which has a certain influence on the body, and the other is profile, cold rolling, hot rolling, setting and so on, which is basically harmless to the body.
In the west of Yimen County, Yunnan Province. Tongchang yi people's township people's government resident. Population 1380. It was named after mining copper mines in Ming and Qing Dynasties. Produce flue-cured tobacco, corn, rice and so on. There are factories for copper mining and wood processing. There is a highway connecting Shuang Yi Highway.