Underground Mining (hard Rock)
Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, mainly those containing metals such as ore containing gold, silver, iron, copper, zinc, nickel, tin and lead, but also involves using the same techniques for excavating ores of gems such as diamonds. In contrast soft rock mining refers to excavation of softer minerals such as salt, coal, or tar sands.
Read more about Underground Mining (hard Rock): Development Mining Vs. Production Mining, Ventilation, Ground Support, Ore Removal, Deepest Mines
Famous quotes containing the words underground and/or mining:
“It is in our interests to let the police and their employers go on believing that the Underground is a conspiracy, because it increases their paranoia and their inability to deal with what is really happening. As long as they look for ringleaders and documents they will miss their mark, which is that proportion of every personality which belongs in the Underground.”
—Germaine Greer (b. 1939)
“In strict science, all persons underlie the same condition of an infinite remoteness. Shall we fear to cool our love by mining for the metaphysical foundation of this elysian temple? Shall I not be as real as the things I see? If I am, I shall not fear to know them for what they are.”
—Ralph Waldo Emerson (1803–1882)