They struck a rich seam of iron ore.

他们开出一个富铁矿层。

《牛津词典》

A glacier next to a nearby zinc and lead mine has retreated since the site closed in 1990, exposing an outcrop of metal-rich ore, where drilling will start again soon.

一座铅锌矿在1990年关闭后，周围的冰川就不断缩小，暴露出金属含量丰富的矿石，因此钻井工作将会很快开始。

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A major outbreak of lead poisoning in children has been occurring in Zamfara State, Nigeria since at least March 2010, related to the processing of lead-rich ore for the extraction of gold.

至少自2010年3月以来，尼日利亚扎姆法拉州就出现了儿童铅中毒大暴发，这与从含铅丰富的矿石中提取黄金有关。

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Out there in the desolate, lunar like desert of northern Chile is a mineral-rich ore called caliche -- once known as white gold.

FORBES: Patricio Contesse's white gold

The court halted mining of the ore in the mineral-rich state in 2011 after social activist group Samaj Parivartan Samuday alleged that rampant illegal mining had damaged the environment.

WSJ: Court Eases Mining Ban in Karnataka

Depending on whether it was just a fluke occurrence or a sign that the constitution of the oil sands it processes is changing, the company could either retool its extraction process or, if the problem is a short-term one, blend the rich ore with more normal inputs.

FORBES: Suncor Invests In Redemption