Iron and gold are different because iron rusts and gold does not.

铁和黄金不同，因为铁会生锈，而黄金不会。

youdao

The separation of iron and gold is solved to a gossan type gold ore through "direct reduction with coal-magnetic separation-cyanidation process".

应用煤基直接还原—磁选—氰化提金工艺处理某铁帽型含金矿石，解决了矿石中铁、金分离问题。

youdao

The materials from e-waste include iron, copper, gold, silver and aluminum.

电子垃圾中的材料包括铁、铜、金、银和铝。

youdao

Let's choose Latin, the language of scholarship, and so iron became Fe for ferrum and lead became Pb for plumbum and gold is Au for aurum and so on.

那就选拉丁文吧，用于学术的语言，所以，iron就变成了Fe，表示铁元素,铅变成了，Pb，表示铅元素,金变成了Au，表示金元素，等等。

麻省理工公开课 - 固态化学导论课程节选

But there are also some big differences, such as the composition of their commodity exports: New Zealand's top exports are dairy, meat and forestry products, whereas Australia's top three are coal, iron ore and gold.

ECONOMIST: Should Australia and New Zealand form a currency union?

South Korea's Yonhap news agency reported that the corporation hoped to exploit deposits of iron ore, gold and copper in other parts of the Tanzania to help fund its project.

BBC: S Korea 'in Tanzania land deal'

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