The practice shows that the flow velocity of bulk ore rock at the stope drawpoint and the dimensions of drawpoint have remarkable influence on the drawing effect.

实践证明，采场放出口矿岩散体速度分布和放出口尺寸对放矿结果有显著影响。

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Based on this, the explosive type that matched the ore rock conditions was determined and the basis for selecting the related parameters of the test of shaft excavation by one blasting was obtained.

据此确定了与矿岩条件相匹配的炸药类型，得到了试验地段一次爆破成井试验的相关参数选取依据。

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Escondida means "hidden" in Spanish, and it refers to the fact that the copper ore body was buried beneath hundreds of meters of barren rock, and the surface geology gave no signs of its presence.

埃斯康迪达在西班牙语中有“隐藏”的意思，正暗示了铜矿的矿体埋藏在废石层下几百米深的地方，而从地表却一丝痕迹也看不出来。

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The company said the closure was necessitated by weak volcanic rock above the ore deposit which allowed water to flow into the mine.

FORBES: The perils of mining

Besides the unsightly effects that many mines have on the landscape, they usually churn out vast quantities of toxic waste in the form of acidic drainage-water and tailings the fine particles of rock produced when ore is ground down to release the minerals it contains.

ECONOMIST: Mine pollution

What was decades ago a lump of rock can be transformed into an economic ore by new technology.

FORBES: Peak Copper: Worldwatch Institute Gets It Wrong Again