Elemental composition can vary within the same copper-ore lode, usually because of varying admixtures of other elements, especially iron, lead, zinc, and arsenic.

即使在同一铜矿矿脉中，元素构成也会发生差异，这一般是因为其它元素，尤其是铁、铅、锡、和砷等程度不同的混合。

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With its proximity to Asia and mother lode of gold, oil, iron ore and coal, Australia has enjoyed uninterrupted growth for the past 13 years.

FORBES: Aussie Stock Guide