main cities of gansu: dunhuang, jiayuguan, lanzhou, wuwei, xiahe, zhangye, tianshui, yumen, jinchang
nearly 3,000 deposits of 145 kinds of minerals have been found and the reserves of 94 kinds of minerals have been ascertained, including nickel, cobalt, platinum family elements, selenium, casting clay, finishing serpentine, and five other minerals whose reserves are the largest in the country. gansu has special advantages in tapping 15 kinds of minerals such as nickel, zinc, cobalt, platinum, iridium, copper, stibium, barite, and baudisserite.