In which city is the main nonferrous metal base in China?

(1) aluminum industry: Harbin, Longxi and Chongqing are the three major aluminum processing bases in China. Shanghai, Tianjin, Beijing, Wuhan, Changsha, Xi, Chengdu and other cities also have aluminum processing industries.

(2) Copper-nickel industry: Nickel is an important emerging non-ferrous metal in China, and most nickel resources are concentrated in Jinchuan, Gansu. In addition, there are Jilin, Sichuan Huili and Xinjiang Kalatongke mines. Jinchuan is a rare super-large polymetallic deposit, with nickel reserves ranking first in the world, copper reserves ranking third in China, second only to Dexing in Jiangxi and Yulong Copper Mine in Tibet, and cobalt reserves ranking second only to Panzhihua in China. Jinchuan Nonferrous Metals Company is a large metallurgical and chemical joint venture.

(3) Lead and zinc industry: it is relatively concentrated in five areas, such as Nanling, western Yunnan, Sichuan and Yunnan, Qinling-Qilian Mountain in Inner Mongolia and Langshan Mountain, and the northern margin of Qaidam Basin has good development conditions. The layout of the Seventh Five-Year Plan is based on the policy of developing central and southern China, accelerating northwest China, developing southwest China, opening up the coast and consolidating northeast China. Zhuzhou is the largest heavy nonferrous metal smelting center newly built after 1949, along with Shaoguan, Shenyang and Huludao zinc smelters. The ore mining centers are Shuikoushan in Changning, Hunan, Taolin in Linxiang, Huize in Yunnan and Chaihe lead-zinc mine in Liaoning. Northwest Changba lead-zinc mine is under construction.

(4) Tin: China is one of the oldest tin producing countries, and tin is a traditional export material. China's tin ore reserves rank among the top in the world. Mining areas and tin ore areas in Southeast Asian countries constitute the famous Pacific Rim tin ore belt, which is an important supplier of tin ore in the world. Tin mines in China are mainly concentrated in Yunnan, Guangxi, Guangdong and Hunan provinces. Yunnan and Guangxi account for more than 90% of the country's total reserves. Gejiu City, Yunnan Province is the largest tin production base in China, known as the "tin capital", and its output accounts for more than 70% of the country. However, due to the long mining history, the ore grade and output are declining. In recent years, many new tin deposits have been discovered in western Yunnan, which provides conditions for the sustainable development of Yunnan tin industry. Guangxi Dachang is the second largest tin mine base in China.