Tonglusha copper mine is a large mine with underground and surface combined mining system.

铜录山铜矿是露天与地下联合开采的大型铜矿。

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The stability of the slope at the west and north of the first underground mining zone is safety guarantee of combined mining.

安太堡不采区的初始开采区域，北面和西面也都是露天矿的边坡，它们的稳定是露天与井工同时开采的安全保证。

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Applying combined mining new technology, the actual mining, manage and fire-protection in mining area have made remarkable economic benefit.

采用综放新技术，使采区在回采、管理、防火等方面取得了显著的经济效益。

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Stephen Ball, chief executive officer of Lockheed Martin UK, owner of UK Seabed Resources, says the engineering experience of offshore oil and gas operations and the trend to rising mineral prices have now combined to make seabed mining feasible.

BBC: UK Seabed Resources joins deep-ocean mineral-mining rush

Mining stocks can sometimes amplify the volatile movements of precious metals they gather from the earth, especially when there are dramatic movements in the price of the commodity itself combined with no reduction or even increases in the costs associated with mining the commodities themselves.

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Alcoa is the world leader in the production and management of primary aluminum, fabricated aluminum, and alumina combined, through its active and growing participation in all major aspects of the industry: technology, mining, refining, smelting, fabricating, and recycling.

FORBES: Alcoa Can't Wait But You Should Before You Buy