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  2. Gold extraction - Wikipedia

    en.wikipedia.org/wiki/Gold_extraction

    Gold occurs principally as a native metal, i.e., gold itself.Sometimes it is alloyed to a greater or lesser extent with silver, which is called electrum.Native gold can occur as sizeable nuggets, as fine grains or flakes in alluvial deposits, or as grains or microscopic particles (known as colour) embedded in rock minerals.

  3. Wilfley table - Wikipedia

    en.wikipedia.org/wiki/Wilfley_table

    Wilfley tables typically act as rougher tables on gravity gold concentrate ahead final concentration methods (e.g. panning) High value heavy mineral concentrate cleaners. In mining, the vast majority of Wilfley-type tables are installed globally to concentrate (e.g.) tin, tungsten, tantalum, niobium, zircon, rutile, leucoxene, xenotime, monazite

  4. Knelson concentrator - Wikipedia

    en.wikipedia.org/wiki/Knelson_concentrator

    Feed material, typically from a ball mill discharge or cyclone underflow bleed, is fed as a slurry toward the centre of the bowl from above. The feed slurry contacts the base plate of the vessel and, due to its rotation, is thrust outward. The outer extremities of the concentrate bowl house a series of ribs and between each pair of ribs is a ...

  5. WestMountain Gold Pours First Gold Bar; and Reports Positive ...

    www.aol.com/news/2012-11-16-westmountain-gold...

    WestMountain Gold Pours First Gold Bar; and Reports Positive Assay Results Pilot Mill at Alaska Terra Project DENVER--(BUSINESS WIRE)-- WestMountain Gold, Inc. ("WestMountain") (OTCBB:WMTN), a ...

  6. Gold cyanidation - Wikipedia

    en.wikipedia.org/wiki/Gold_cyanidation

    Gold cyanidation (also known as the cyanide process or the MacArthur–Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore ...

  7. List of gold nuggets by size - Wikipedia

    en.wikipedia.org/wiki/List_of_gold_nuggets_by_size

    A gold nugget is a naturally occurring piece of native gold. Watercourses often concentrate nuggets and finer gold in placers.Nuggets are recovered by placer mining, but they are also found in residual deposits where the gold-bearing veins or lodes are weathered.

  8. Borax method - Wikipedia

    en.wikipedia.org/wiki/Borax_method

    Borax is a crystal-forming mineral that can be reduced to a powder, in this case for use as a flux. The borax method is a technique of artisanal gold mining, which uses borax as a flux to purify gold concentrates.

  9. Roasting (metallurgy) - Wikipedia

    en.wikipedia.org/wiki/Roasting_(metallurgy)

    Roasted gold ore from Cripple Creek, Colorado. Roasting has driven off the tellurium from the original calaverite, leaving behind vesicular blebs of native gold. Roasting is a process of heating a sulfide ore to a high temperature in the presence of air. It is a step in the processing of certain ores.

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