In the late 1970s, residents of the Wanli district of Tainan City began importing scrap from the US such as electronic components and communications equipment. From this scrap they reclaimed metals like gold, silver and copper by such methods as acid washing or burning off the non-metallic parts.
民國六十年代末期，台南市灣裡地區居民自美國進口電子零件、通訊器材等廢五金，以酸洗和燃燒等方式，回收金、銀、銅等貴金屬。