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coarse gold may be removed by gravity concentration the processing required to recover fine gold from crushed ore is determined by the free-milling or refractory

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history of technology the development over time of systematic techniques for making and doing things the term technology a combination of the greek technē art

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corundum is used as a gemstone abrasive refractory and much more red corundum is a ruby blue is a sapphire any other color is a fancy sapphire synthetic

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iridium is a chemical element with symbol ir and atomic number 77 a very hard brittle silvery-white transition metal of the platinum group iridium is generally

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cyanidation - a method of extracting gold or silver by dissolving it in a weak solution of sodium cyanide development - is the

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terminology for most of their recorded history taiwanese aborigines have been defined by the agents of different confucian christian and nationalist quot civilizing

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aug 05 diamonds are the ultimate form of conspicuous consumption despite the likes of edward jay epstein railing against de beers demand for diamonds will likely

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processing methods although there are a number of different diamond recovery technologies being utilized worldwide the two principal types are rotary pan plants and

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this mining method involves searching for gold in ancient layers of sediment known as alluvial deposits these layers are composed of tiny bits of gravel sand and

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in the 18th century diamond deposits were discovered in brazil in small quantities and later in australia russia and the united states

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