242, Mining of non-ferrous metal ores, except gold and uranium . The crushing, grinding or otherwise treating certain earths, rocks and minerals .. sulphur ores and natural sulphur, potash, sodium and borate minerals, barytes, . stones (except diamonds) and semi-precious stones such as emerald crystals and tiger's eye.
Oct 10, 2018 . The Kafubu emerald mines are located in central Zambia, 45 km ... After crushing, the ore is washed and sized, with ... siderite, ferroan dolomite, ankerite and calcite); niobian rutile, pyrite, talc, zircon, barite, albite, calcite,.
The roads we ride or drive on and the buildings we live learn and work in all contain . state or after mechanical processing, such as crushing, washing, or sizing. . Barium: Barium is an element, derived primarily from the mineral barite, and used . The gemstones of beryl, a beryllium mineral, are emerald and aquamarine.
Until 2008, all of the emerald-bearing ore produce at the Kagem mine was . reaction zones where they are easily removed by crushing and processing of the rock . zircon, barite, albite, lepidocrocite, glauconite, quartz, chrysoberyl, margarite,.