煤炭、金属矿石和地球上所能找到的其他有用物质，同土地相比更为有限。
Coal, metallic ores, and other useful substances found in the earth, are still more limited than land.
矿石有用组分以锌为主，铅、铜、金共生，其中闪锌矿中金元素含量非常高。
The main useful components of ore are zinc, lead, copper and gold, while sphalerite is rich in gold.
细菌浸出法是利用某些微生物及其氧化产物溶浸矿石中的有用金属的一种新工艺。
Bioleaching is a new technology using microorganism and its oxidizing product to leach useful metals.
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