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Originally appearing in Volume V08, Page 161 of the 1911 Encyclopedia Britannica.
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VET . 6minerals found in the concentrates are pebbles and fragments of See also:

pyrope, See also:zircon, See also:cyanite, chrome-See also:diopside, See also:enstatite, a See also:green See also:pyroxene, See also:mica, See also:ilmenite, See also:magnetite, See also:chromite, See also:hornblende, See also:olivine, See also:barytes, See also:calcite and See also:pyrites. In all the S. See also:African mines the diamonds are not only crystals of various weights from fractions of a See also:carat to 150 carats, but also occur as microscopic crystals disseminated through the See also:blue ground. In spite of this, however, the See also:average yield in the profitable mines is only from 0.2 carat to o•6 carat per load of 1600 lb, or on an average about 11 grs. per ton. The See also:annual output of diamonds from the De Beers mines was valued in 1906 at nearly £5,000,000; the value per carat ranging from about 35s. to 70s. Pipes similar to those which surround See also:Kimberley have been found in other parts of S. See also:Africa. One of the best known is that of See also:Jagersfontein, which was really the first of the dry diggings (discovered in 1870). This large mine is near Fauresmith and 8o m. to the See also:south of Kimberley. In 1905 the See also:year's See also:production from the See also:Orange See also:River See also:Colony mines was more than 320,000 carats, valued at £938,000.

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