Photo taken on May 9, 2011, shows a bronze drum unearthed in an ancient noble tomb in Guangnan County, southwest China's Yunnan Province. The Yunnan provincial archaeological institute and the Guangnan government on Monday jointly announced that the tombs discovered in Heizhiguo Township of Guangnan County are noble tombs and even royal tombs of the ancient Gouding kingdom under the rule of the Han Dynasty (202 BC-220 AD).