The effect of basicrock 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。
2
The primary gold deposits in western Hunan are included mainly in three types as quartz vein type, fracture zone altered rock type and altered basicrock 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。
3
The writers think of the two-pyroxene granulite enclaves as the undissolved renains while some kind of basicrock in crust is partly dissolving and after the mid-acid porphyry formed.