人类开发利用金银,已有数千年历史。由于金银在自然界中的稳定性及良好加工性能,自古以来,人们就将其以货币、金银锭、装饰、器皿等形式保留下来。据估计,在人类目前已生产的9.9万吨黄金中,仍留存于世界上的便近达8万吨。白银虽消耗较多,但也有25％左右至今还流传于人间。长期来,人们把金银储备视作权力和财富的象征,直至目前,许多国家还以金银储备为后盾,左右着国家经济命脉。特别是七十年代 Human development and utilization of gold and silver, has thousands of years of history. Due to the stability of gold and silver in nature and good processing properties, since ancient times, people keep it in the form of currency, bullion, decoration, utensils and the like. It is estimated that among the 99,000 tons of gold currently produced by mankind, nearly 80,000 tons remain in the world. Although silver consumes more, about 25% of the silver is still circulating in the world. For a long time, people have regarded bullion reserves as a symbol of power and wealth. Up till now, many countries have backed the reserves of gold and silver and have dominated the national economic lifeline. Especially the seventies