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• Mineral processing (Practical Action Technical Brief)
  |Sapphire ...l.jpg|thumb|150px|right|Figure 3: A ball mill being used as part of a gold mining operation in Arequipa, Peru Photo: Practical Action]]
  38 KB (6,224 words) - 03:38, 26 August 2016
• Original:Lapidary Work
  ...little mining town which opened up about 1849 and is famous for its silver mining. The Creede bacon is a mixture of amethyst and agate and one or two other m The main gemstones are: diamond, ruby, sapphire, emerald, topaz, amethyst, agate, tiger's eye, jade, lapis lazuli, opal and
  19 KB (3,484 words) - 05:18, 17 December 2011
• Viability of recycling semiconductors in LED Televisions
  ...InGaN or GaN semiconductor devices is the substrate. Silicon carbide and sapphire substrates are both used. The substrate heated in a chamber with an atmosp ...upply for indium and gallium are both low purity (<99%) when produced from mining companies. The low purity product could be sold directly to the same custom
  17 KB (2,676 words) - 22:01, 3 November 2012