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The Super Pit swallowed a century of small underground workings on the Golden Mile into a single hole 3.5 km long. It is the most photographed mine in Australia.
品位。 Low grade by underground standards, made economic by scale.
"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。
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The best electrical conductor there is, and the metal that has been used as money for longer than almost anything…
"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。