Dec 31, 2014 A Visit to the Kagem Open-pit Emerald Mine in Zambia. Tao Hsu, Andrew Lucas, Vincent Pardieu, Robert Gessner. December 31, 2014. Compared to other colored gemstone operations, the pit at the Kagem emerald mine is quite massive. Blasting is used to remove the topsoil and waste rock that cover the emerald-bearing ore.
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