Some 13% of the proved deposits of minerals are the largest of their kind in China, and two-thirds of the deposits are among the largest of their kind in the Yangtze River valley and in south China. Yunnan ranks first in the country in deposits of zinc, lead, tin, cadmium, indium, thallium and crocidolite. Other deposits include iron, coal, copper, gold, mercury, silver, antimony and sulfur.