Tailings - Wikipedia
Examples Sulfide minerals The effluent from the tailings from the mining of sulfidic minerals has been described as "the largest environmental liability of the mining industry". These tailings contain large amounts of pyrite (FeS 2) and Iron(II) sulfide (FeS), which are .
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Bayer process - Wikipedia
In the Bayer process, bauxite ore is heated in a pressure vessel along with a sodium hydroxide solution at a temperature of 150 to 200 C. At these temperatures, the aluminium is dissolved as sodium aluminate in an extraction process. The aluminium compounds .
Froth flotation - Wikipedia
Froth flotation is one of the processes used to recover recycled paper. In the paper industry this step is called deinking or just flotation. The target is to release and remove the hydrophobic contaminants from the recycled paper. The contaminants are mostly printing .
Copper extraction techniques - Wikipedia
Until the latter half of the 20th century, smelting sulfide ores was almost the sole means of producing copper metal from mined ores (primary copper production). Davenport, et al, noted in 2002 that even then 80% of global primary copper production was from copper .
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The Ruby Mine, Sierra County, California [Read this article from the California Mining Journal, April 1987] The Ruby Mine is an underground placer and lode mine located between Downieville and Forest City, in Sierra County, California. It is in the Alleghany .
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Gold mining - Wikipedia
It is impossible to know the exact date that humans first began to mine gold, but some of the oldest known gold artifacts were found in the Varna Necropolis in Bulgaria. The graves of the necropolis were built between 4700 and 4200 BC, indicating that gold mining .
Mineral Spiral Concentrators
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Gold cyanidation - Wikipedia
The expansion of gold mining in the Rand of South Africa began to slow down in the 1880s, as the new deposits being found tended to pyritic ore. The gold could not be extracted from this compound with any of the then available chemical processes or technologies
11. Gold and gold mining Te Ara Encyclopedia of New Zealand
Dredging and alluvial mining The international price of gold was fixed for most of the 19th and 20th centuries. As other goods increased in price, gold became relatively less valuable. In the late 1960s the price of gold was allowed to float. It rapidly rose in the.
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