underground mining
production of underground cavities in the mountains in a closed construction
underground hard rock mining
underground mining techniques used to excavate hard minerals
deep underground mining
form of underground mining, in which the development of the deposit and the extraction of the raw materials take place at a greater depth
longwall mining
a form of underground coal mining where a long wall of coal is mined in a single slice
Underground mining (soft rock)
mining techniques used to extract minerals/materials from sedimentary rock