Host-rock alteration is made up of retrograde and mineralized alteration.

围岩蚀变包括退化蚀变和矿化蚀变。

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Rock mechanics models have been established for different types of rock structure to offer a reliable mechanical basis for the analog analysis of host rock stability while mining in a broad area.

采用围岩分类专家系统中的不确定性推理处理方法，以工程地质学家谷德振提出的岩体结构划分标准为基础，对金川二矿区岩（矿）体用模糊数学中择近原则的方法进行模糊综合判别。

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So it has more important significance that how to recognize silicified rock from host rock and the extent of silicify.

因此，如何正确地识别硅化岩石与原岩，以及硅化的强弱对于找矿有着重要意义。

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He's a rock critic for the Chicago Sun Times and co-host of the public-radio rock 'n' roll talk show Sound Opinions.

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