Jewelry Diamonds And Gems

The two types of techniques that are the safest and most popular ways to extract minerals are bore and strip mining. Both can produce tons of metal ore however environmental issues prohibits this from being an exclusive way of mining. Strip mining and shaft mining remove dirt and rock to extract the metal ore desired. While strip mining (or pit) is the most destructive, it does provide a means of extracting several ores all at once. Soil and covering is removed by the huge Dragline cranes then small excavators move in and remove the needed ore.

Open-Pit diamond mining or open-cast mining is a method of extracting rock or minerals from the earth by removal from an open pit or burrow. Open pit mines are used when deposits of minerals are found near the surface or along kimberlite pipes. Open pit mining is used when the “overburden,” or surface material covering the deposit, is relatively thin and/or the minerals are imbedded in structurally unstable earth (cinder, sand, or gravel) that is unsuitable for tunneling. “Pit lakes” tend to form at the bottom of open-pit mines as a result of groundwater intrusion.

Underground mining requires the dynamiting of sections of diamond bearing ore into small pieces. These pieces of ore are then gathered up and dumped into railway cars that travel the mine’s access tunnels to the cruncher. The cruncher breaks up the ore into yet smaller pieces resembling gravel in preparation for later steps in the diamond recovery process. This gravel-like material is next poured into another machine called a churning tank, where the diamonds, because of their high density, sink to the bottom along with some of the heavier gravel. This material is finally moved onto conveyor belts, which carries it to the grease table.

With the increase of diamond production about ten times what it had been before the 1870?s what use to be an extremely rare mineral became very accessible to Western societies. This effect caused the world to change their outlook on diamonds. Diamond production has gone from zero to almost five million carats in five short years. In 2001, there was a 53% increase in the quantity of diamonds mined from the previous year; in 2002 carat recovery increased by 34% over 2001.

When you are buying brand new jewelry, it’s important to ask as many questions as possible about the origins of the material. Although not entirely fail-safe, the KPCS provides a good frame of reference for buying legitimate diamonds. Shipments of diamonds from Kimberley Process participating countries are shipped with a certificate of origin, and participating countries only trade with other Kimberley Process participants. Also, always buy from a reputable dealer who should be willing and able to tell you a diamond’s country of origin and the mine from which it came.

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