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At Mponeng the rock is around 60 C before any machinery starts, and the mine ships ice underground by the tonne to make the air survivable. It is the physical limit of how deep humans currently mine.
品位。 Narrow, high-grade reef — a seam sometimes thinner than this line of text.
"品位"是指有用成分在矿石中所占的百分比。一座品位为0.5%的铜矿，每产出一吨铜就需丢弃199吨废石。这一个数字，决定了一个矿体究竟是可开采的矿山，还是仅具地质意义的有趣岩石。
产出内容
Gold
The metal that does not tarnish, does not corrode and never runs out once mined — which is why almost all of it ever…
Uranium
A heavy, faintly radioactive metal whose nucleus can be split, releasing about two million times more energy per…
"副产品"是指因与主矿种赋存于同一岩体而被回收的金属，并非专门勘探的目标。因此，其供应量受主矿种经济性驱动，而非自身供需关系。