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Ch. 10: The Essential Combination

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	322 THE DIAMOND MINES OF SOUTH AFRICA



	level. At Kimberley mine nine levels are being worked, from the 1840-foot to the 2160-foot level inclusive. The galleries are not supported in any way by timbers, but all tunnels in soft blue ground are timbered with sets of two props and a cap of round timber, and are covered with inch and a half lagging. Soft blue ground is drilled with long jumper drills sharpened at both ends. In hard blue ground, drills and single-hand hammers are used. The native workers become very skilful in both methods of drilling, and do quite as much work as white men would do under similar conditions.

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