File:Factory and industrial management (1891) (14577752397).jpg

Identifier: factoryindustria15newy (find matches)
Title: Factory and industrial management
Year: 1891 (1890s)
Authors:
Subjects: Engineering Factory management Industrial efficiency
Publisher: New York (etc.) McGraw-Hill (etc.)
Contributing Library: Engineering - University of Toronto
Digitizing Sponsor: University of Toronto

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n theavailable water, have been obliged to shut down for short periodsduring the long droughts, on account of the shortage of water-supply.As the reefs outcrop along the toj) of the watershed between thestreams flowing into the Atlantic on the west and the Indian ocean onthe east, there is no large catchment area in the vicinity of the mines,and they are limited to the conserving of water from very small areasduring the short rainy season. The amount of water pumped fromthe mines is small, much too little for the mining requirements, andin the deep levels the amount is still less, in i)roportion, than in theoutcrops. Mr. W. II. Ilall estimates that the outcrop ground yieldsabout 50,000 gallons per shaft, the first row of deep levels about45,000 gallons per shaft, and the second row of deep levels not morethan 2,500 to 5,000 gallons per day. Then, too, the mine water isusually very acid, on account of the oxidizing of the pyrites in theore, so that the boilers and pipes suffer greatly.
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26 264 MINING ON THE WITIVATERSRAND. Every endeavour is made to recover all possible water after using ;so, in addition to the main dams for impounding surface water, thereare tailings and slimes reservoirs, where the water from the tailings andslimes is caught, to be pumped back to the mill and used over again. Much capital has been expended in dams. Along every smallspruit and dry creek, dams of greater or less extent have been built tocatch storm-water. The largest of these are those built by the RandMines, the one on the Natal spruit holding not less than 700,000,000gallons, and being built of masonry. From these dams the water is pumped to large distributing reser-voirs, from which supplies are drawn. Though simple in construc-tion, they represent the outlay of considerable capital. They are

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