一、世界贵金属的资源据日本报导,到1975年为止,世界上已发现的铂族金属铂、钯、铱、铑、钌、锇的总藏量约15000吨,按目前用量情况,只能用100年左右的时间。金银也同样受到资源限制。世界黄金最大生产国南非,最近不得不开采低品位的金矿,例如1970年,开采金矿品位为13.3克/吨,1974年开采的金矿品位下降到10.0克/吨,鉴于贵金属资源 I. World Precious Metals Resources According to reports in Japan, until 1975, the total reserves of platinum group metals such as platinum, palladium, iridium, rhodium, ruthenium and osmium found in the world have reached about 15,000 tons. According to the current usage, they can only be used About 100 years time. Gold and silver are also subject to resource constraints. South Africa, the world’s largest gold producer, has had to exploit low-grade gold mines recently. For example, gold was mined at 13.3 g / t in 1970 and declined to 10.0 g / t at 1974. Given the precious metal resources