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Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, usually 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 or rubies.
An aluminum smelter was started up in Lend, Austria, in 1899. Little aluminum was produced in Germany before 1914, but World War I brought an urgent demand, and several smelters went into production employing electricity generated by steam power. Later the U.S.S.R. began producing substantial amounts of aluminum in the Ural industrial complex, and by 1990 primary metal was produced in 41 nations throughout the world.
Aluminium is the most abundant metal in the earths crust. The aluminium containing bauxite ores gibbsite, böhmite and diaspore are the basic raw material for primary aluminium production. Proven, economically viable reserves of bauxite are sufficient to supply at least another 100 years at current demand.
Chip clearance is the name of the game for aluminum, and 3 flutes give you that perfect balance of tool strength and chip clearance. 2 flutes can be a viable option where cutting forces are lower and chip clearances are more of a factor. This can also be a way to reduce cutting forces for light, iffy cuts.
The first type is the boom truck. These machines are usually used in order to break huge rocks or even to extract metal from the ground. The other type is the tunneling machine which is also known as a mini digger. Another type of machines that are used is the line machine. These are also used to break large amounts of ore.