Gold Mining Machinery: Its Selection, Arrangement, and Installation by W. H. Tinney

Author:W. H. Tinney
Language: eng
Format: epub
Publisher: Van Nostrand
Published: 1906-03-25T05:00:00+00:00

ROCK DRILLS.

177

is roughly ascertained by magnetic and dip needles imnietsed in warm gelatine solution which solidilies in the borehole; the position assumed by the needle with regard to the glass tube in which il is set gives an approximate idea of the deviation.

The machine shown in Fig. 71 is one of the most powerful made by the Sullivan Company, and has put down some of the deepest bores in the South Afritan gold field, a country in which an unusual number i>( deep bores have l)een made in order to locate the reef at increasing distances from the outcrop. The deep bore at 1 loom-kloof was carried to a depth of 3,100 ft. by the Sullivan "N"drill, which has a rated capacity of only i.ooo ft., and was completed at 5,560 ft. by the "I"' drill, with a rated capacity of 4,000 ft. It will be noticed that the Sullivan machines are rated well within their capacities. When the Ijore was nearing completion the rods alone weighed between 15 and id tons, this weight being handled by the engine without difficulty. The huring occupied fourteen months, an average speed of 400 ft. Fiu 71.- I'tiierit TuUuIni Sutl Dcirink, miulc 111

month ; the rotis were stciions, for transport.

pulled in 50 ft. lengths by means of a tubular steel derrick 66 ft. high. At a depth of 5,000 A.,

. 3A hours Were taken in lowering the rods, and from jj to 4 hours in

k hoisting them.

It was the "P" drill also that bored to 5,582 ft. at Springs, near Qohanncsburg, beginning on ist May 1904 and finishing on 2nd February

|jgoc. an average s|jecd of more than 600 ft. a month for over a mile

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