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Contact NowUnderground 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.
Contact NowAn octant, also called "reflecting quadrant", is a measuring instrument used primarily in navigation.It is a type of reflecting instrument that uses mirrors to reflect the path of light to the observer and, in doing so, doubles the angle measured.
Contact NowInternational Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research ..
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