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地球中的黄金黄金是稀有金属,在地壳里的92种元素中排第74位。根据有关地质资料,黄金在地壳中的丰度为3.5ppb,即平均每吨岩石中含黄金0.0035克。地壳的质量为0.24×10”吨,则黄金的分布量为8.4×10”吨,占地球总含金量的0.0018％。黄金不仅在地壳中的含量如此之微,而且在自然界里也很少富集成矿。即使形成可供利用的矿床,黄金在岩金矿中的最低可采品位一般也只有3克～5克/吨,砂金矿中的最低可采品位一般也只有0.1克～0.2克/吨。这里所说的黄金矿石,实际上是用肉眼根本看不到或仅仅能看到一点点金丝或金微粒的矿
The gold in the earth is a rare metal, ranking 74th out of 92 elements in the earth’s crust. According to the geological data, the abundance of gold in the earth’s crust is 3.5 ppb, or 0.0035 grams of gold per tonne of rock. The quality of the crust is 0.24 × 10 “tons, the distribution of gold is 8.4 × 10” tons, accounting for 0.0018% of the total gold content of the earth. Gold is not only so small in the earth’s crust, but it is also rarely found in nature. The lowest recoverable grade of gold in rock gold ore is typically only 3 to 5 g / tonne, even though the available deposit is formed. The lowest recoverable grade in placer gold is typically only 0.1 to 0.2 g / t. Gold ore here, in fact, can not see with the naked eye or can only see a little bit of gold or gold mine