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Underground mining hard rock Wikipedia. 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.
Crusher - Wikipedia. A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. . Querns and mortars are types of these crushing devices. .. ease the process transportation if they are to be taken underground for carrying out the.
Crusher - Wikipedia A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. Crushers may be used to reduce the size, or change the form, of waste materials so they can be more easily disposed of or recycled, or ...
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Crusher - Wikipedia, the free encyclopedia. A portable rock crusher from the early 20th century ... to ease the process transportation if they are to be taken underground for carrying out the operations. Read more
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Crusher - Wikipedia. Universal crusher-the swing jaw is fixed at an intermediate position The Blake crusher was patented by Eli Whitney Blake in 1858. The Blake type jaw crusher has a fixed feed area and a variable discharge area. Blake crushers are of two types- single toggle and double toggle jaw crushers.
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