Precious metals are mainly refers to gold (Au), silver (Ag) and platinum group metals [platinum (Pt), palladium (Pd), osmium (Os), iridium (Ir), ruthenium (Ru), rhodium (Rh)] 8 kinds of metal elements. Most of these metals has a beautiful color (except platinum group metal osmium blue-gray metal, the other are the silver-white metal), chemical resistance of a large, under normal conditions, it is unlikely to cause a chemical reaction. Precious metals are used to make jewelry and souvenirs, but also a wide range of industrial uses.
Base metals are usually less expensive metal, as opposed to say the precious metal. In the mining and economic fields, base metals industry refers to non-ferrous metals (excluding precious metals). These include copper, lead, nickel and zinc. In addition to the metal, the base metal further including steel, aluminum, tin, tungsten, molybdenum, tantalum, magnesium, cobalt, bismuth, cadmium, titanium, zirconium, antimony, manganese, beryllium, chromium, germanium, vanadium, gallium, hafnium, indium , niobium, rhenium and thallium.
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