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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. Borax method - Wikipedia

   en.wikipedia.org/wiki/Borax_method

   In contrast to the use of mercury (which relies on amalgamation of the gold to coalesce it and separate it from impurities) this method relies on borax's ability to lower all the minerals' melting points. Since the gold is usually the heaviest of these minerals, it allows for concentrating the gold on the bottom of the crucible.

4. Pressure oxidation - Wikipedia

   en.wikipedia.org/wiki/Pressure_oxidation

   Pressure oxidation is a process for extracting gold from refractory ore. The most common refractory ores are pyrite and arsenopyrite , which are sulfide ores that trap the gold within them. Refractory ores require pre-treatment before the gold can be adequately extracted. [ 1 ]

5. Scientists find way to make gold from electronic waste

   www.aol.com/news/scientists-way-gold-electronic...

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6. New facility to extract gold from electronics to open in Wales

   www.aol.com/facility-extract-gold-electronics...

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7. Tank leaching - Wikipedia

   en.wikipedia.org/wiki/Tank_leaching

   The tank leaching method is commonly used to extract gold and silver from ore, such as with the Sepro Leach Reactor. References This page was last edited on 12 ...

8. Gold plating - Wikipedia

   en.wikipedia.org/wiki/Gold_plating

   The thickness of gold plating on jewellery is noted in microns (or micro-meters). The microns of thickness determines how long the gold plating lasts with usage. The jewellery industry denotes different qualities of gold plating in the following terminology Gold flashed / Gold washed - gold layer thickness less than 0.5 micron

9. Extractive metallurgy - Wikipedia

   en.wikipedia.org/wiki/Extractive_metallurgy

   Extractive metallurgy is a branch of metallurgical engineering wherein process and methods of extraction of metals from their natural mineral deposits are studied. The field is a materials science, covering all aspects of the types of ore, washing, concentration, separation, chemical processes and extraction of pure metal and their alloying to suit various applications, sometimes for direct ...