迄今的考古发掘证实,云南范围内最早的青铜器于1957年出土于大理剑川海门口遗址,C14测定为距今3115±90年。在千余件出土器物中,有大量陶器、石器和骨、角器,铜器则有14件,经北京铜铁学院化学成分检测,其中鱼钩、铜夹等5件含锡量仅1%左右,属红铜器;铜斧、镰等9件含锡5%~10%之间,为青铜器。一同出土的还有一铸铜的石范。1978年复又出土铜器12件,大多亦为青铜器。(1)从多数器形为范铸(非锻打)和含锡量较高(非铜锡共生)等特征 The archaeological excavations to date confirm that the earliest bronze ware in Yunnan Province was unearthed in 1957 at the Jianchuan Haimenkou site in Dali, where the C14 was measured as 3115 ± 90 years ago. In a thousand pieces of unearthed utensils, there are a large number of pottery, stone and bone, angle, bronze, there are 14 pieces by the Beijing Institute of copper chemical composition testing, including hooks, copper clips and other 5 containing only 1% Around, is a bronze; ax ax, sickle and other 9 containing tin 5% ~ 10% for the bronze. Also unearthed with a bronze Shi Fan. In 1978 unearthed bronze 12, mostly bronze. (1) from the majority of the shape of the fan-casting (non-forging) and containing a higher amount of tin (non-copper and tin symbiosis) and other characteristics