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Ch. 10: The Essential Combination

Ch. 10: The Essential Combination Page of 449 Ch. 10: The Essential Combination Text size:minus plus Restore normal size   Mail page  Print this page
SYSTEMATIC MINING
357
average quantity of water pumped from the mine is about 40,000 gallons per hour, or more than three times the quantity which is pumped from De Beers and Kimberley mines com­bined. In order to make use of this water, it is pumped to De Beers floors for washing the blue ground, and to the village of Kenilworth for irrigation purposes.
The average yield of diamonds for several years past under De Beers management has been three-tenths of a carat per load.
The value of the Premier mine diamonds as compared with those from De Beers and Kimberley mines is about twenty per cent less, owing to the greater proportion of boart and small diamonds. The diamonds from this mine show distinctive char­acteristics, and a parcel of them can be easily distinguished from those produced from other mines. It is estimated that the production of this mine could be raised to 1,000,000 carats per annum. The mine is being developed for the commence­ment of underground mining. Plan on page 318 shows the shape and size of the mine on the 500-foot level. It is estimated that there are 13,000,000 loads, equal to 10,400,-000 tons, of blue ground in sight above this level. The Premier mine may, therefore, be looked upon as a mine of very great value, and one which will play an important part in the future history of the diamond-mining industry.
Ch. 10: The Essential Combination Page of 449 Ch. 10: The Essential Combination
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