The second step of mining is to process the ore to seperate the diamonds from the rest of the ore. The ore is put into a large funnel along with a heavy fluid and is then mixed, causeing a rotation in the fluid. This process is much like panning for gold. As diamonds are more dense than the surrounding material, they tend to sink while the rest of the material rises to the top and spills out. According to the Natural Museum of History, "99 percent of the waste in ore is removed." (Diamonds - American Musuem of History) To further seperate the remaining one percent of.waste, an X-ray diamond recovery machine is used. This machine is used in the State Line Kimberlite District in Colorado. (McKenzie Bay International Ltd.) The final step in mining is the seperation of diamonds into industrial grade and gemstone grade stones. This can be done at the mine or at a diamond center.
http://www.emporia.edu/earthsci/amber/go340/students/laird/diamond3.html
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