A gold mine is not a bottomless pit, the gold runs out.

一个金矿不是无限的，黄金采光了。

《柯林斯英汉双解大词典》

Nine tons of gold on plane AN12 belonged to a gold mine company.

AN12 飞机上的九吨黄金属于一家金矿公司。

youdao

People all rushed to the place where a gold mine had just been discovered."

人们都涌向金矿刚被发现的地方。

youdao

Some years earlier, he had asked several people to invest in a gold mine he had in Death Valley.

VOA: special.2011.08.03

Homestake operated as a gold mine for one hundred twenty-five years before closing about nine years ago.

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"Gold is Where you Find It" by Tyrone Comfort shows a man deep inside a gold mine.

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But this horde of documents is going to prove a gold mine for academic research.

BBC: Wikileaks: Bumpy ride ahead for US diplomats

Telcos are sitting on a gold mine of core capabilities and assets, critical for M2M success.

FORBES: The Massive M2M Business Opportunity (Part 2)

But for most sports, being televised is both an affirmation of status and a gold mine.

FORBES: Magazine Article