Journal of electricity, power, and gas . ] ELECTRICAL HYDRAULIC MINING BY N. K. COOPER. (This is a description of a successful method of gold mining hydraulically which is applicable tothose places where the gravels are too shallow to permit satisfactory dredge operations. Costs of in-stallation and operation are given.—The Editors.) The experience of the early hydraulic miners inCalifornia paved the way for the development ofhydroelectric power. Today that power is in turnmaking hydraulic mining possible in many caseswhere water is scarce, or the head not great enough foreconomical operation.
Journal of electricity, power, and gas . ] ELECTRICAL HYDRAULIC MINING BY N. K. COOPER. (This is a description of a successful method of gold mining hydraulically which is applicable tothose places where the gravels are too shallow to permit satisfactory dredge operations. Costs of in-stallation and operation are given.—The Editors.) The experience of the early hydraulic miners inCalifornia paved the way for the development ofhydroelectric power. Today that power is in turnmaking hydraulic mining possible in many caseswhere water is scarce, or the head not great enough foreconomical operation. Many of the gold-bearinggravels of California also cannot be profitably dredged pump, which performs the double duty of supplyingwater under 250 ft. head for a giant, which washesdown the gravel, and also to a hydraulic elevator,which raises the gravel to sluice boxes. This pumpis a 12 in. horizontal 2-stage series Byron Jacksoncentrifugal, driven at 1160 by a 400 2200-volt Westinghouse motor, to which it is directly con-. Comprehensive View of Hydraulic Giant in Operation, showing Hydraulic Elevator and Head of Sluices. because they are so shallow or the bedrock is so un-even as to make dredge operation unsatisfactory, ifnot impossible. These difficulties have recently been solved bya unique installation near Loomis, California, whereThe Associated Miners are now working about sixtyacres of level gravel, averaging twelve feet in depth. The system centers about a 400 motor driven nected. The pump handles 4500 gal. of water per min-ute under the 250 ft. head. In starting operations a pit was first dug for theelevator, and a line of 15 in. pipe run to the elevatorand lines of 14 in. pipe to two giants placed aroundthe elevator. While only one giant is operated mostof the time this arrangement enables the bedrock tobe washed, even in deep crevices, and to be cleaned 92 JOURNAL OF ELECTRICITY, POWER AND GAS [Vol. xxxn—No. 5 up by the streams from the giants wi
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