The effect of basic rock thickness, mining height and advancing speed on roof breaking is analyzed.

并进一步分析了基岩厚度、采高、推进速度对顶板破断的影响。

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The primary gold deposits in western Hunan are included mainly in three types as quartz vein type, fracture zone altered rock type and altered basic rock type.

湘西地区的岩金矿，主要有石英脉型、破碎带蚀变岩型和基性岩蚀变型三类。

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The writers think of the two-pyroxene granulite enclaves as the undissolved renains while some kind of basic rock in crust is partly dissolving and after the mid-acid porphyry formed.

笔者们认为二辉麻粒岩包体是下地壳中某种基性岩发生部分熔融，形成中酸性斑岩后的难熔残体，并且利用微量元素的定量模式计算了部分熔融的程度。

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All that mining and trucking rock around was expensive, even though the basic idea, heating the rock, has always been very simple, so simple that you can even do it at home, as NPR's technology reporter Nell Boyce explains.

NPR: Industry Seeks to Extract Oil from Rocky Mountain Shale

Not content with the basic black concert T shirt, the Stones are moving into upscale souvenirs--Rolling Stones Rock wear--to be sold at the concert sites when possible, but also in retail outlets like Macy's, J.

FORBES: Satisfaction Guaranteed

Ms Knight said the banks supported the basic framework of the tripartite agreement but that it had clearly been "found wanting" during the Northern Rock crisis.

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