Mohave County miner., 1914-02-07
National Copper Mines Com
 pany.

Idaho, constitutes one of the most in teresting that has been made in the district for some time.
 Power will be purchased from the Washington Power company under a contract which makes it desirable for the mining company to maintain as high a power factor on the load as possible. The mining company has water rights from which approxi- mately 600 horsepower can be devel- oped and it was determined to utilize this to supply part of the power re- quirements of the mine and mill and at the same time to use these general ing stations to improve the power factor as much as possible. Accord ingly two hydro electric plants will be built on Dead Mans creek located so as to secure the maximum amount of power from the available water. In each plant there will be installed an impulse type water wheel driving a POO, 3 phase, 60.cycle generator. These plants will be connected to the load in parallel with the power supply of the Washington Water Power company. There will be no attempt made to reg ulate the load taken by these plants, and as a consequence the waterwheel will not be supplied with governors of the ordinary design. They will, how ever, be supplied with overspeed gov ernors which will defect the water wheel nozzle in case through any ac cident the load on either or both of the plants is disconnected which would tend to allow the water wheel to race. When the machines are connected in parallel with the Washington Water Power company's lines, the frequency delivered by the power company will necessarily fix the speeds at which the generators can run and they will take as much of the mining company's load as the water running through the wa ter wheels will permit. They will, therefore, always be developing as much power as possible, yet their speed will be fixed and held constant by the frequency of the power con- pany's supply lines.
 The fields of these generators will be so designed that by adjusting the excitation properly very high power factor on the entire load will be se- cured.
 One of these hydro electric plants will be designed for operation in the usual manner by an attendant ln the station. The other plant is designed to run without attendance and the gen. orator may be connected to or discon- nected from the load from distant point (the compressor station at the mine) by means of electrically operated switches. The governor on the water wheel will be also controlled by the same mechanism which operates the switches and the plant will be stopped or started without anyone going near it. The installation at the mine will consist of approximately 300 horse power in induction motors, the largest being POO horsepower Westinghouse motor driving an air compressor.
 The mill which has been designed and is being built by the General En- gineering company of Salt Lake, will be driven by approximately 600 horse. power of induction motors. Each de. partmsnt of the mill will be driven b, separate motor, the two largest in dividual machines being a 300 horse power on the Hardings mill depart ment. and POO horsepower on the dr. crushing department. All the motors will be equipped with suitable protec tive apparatus to cut them off iron the supply lines in case of overload ol in case of failure of power.
 Electric haulage will be used under ground to handle the ore, and the or, will be transported from the tunne mouth to the mill over an electric rail way, which is rather unique in som of it's features. The run from tn alit to the head of the mill is abou 10000 feet long and in this distanc there is drop of 450 feet In elevation necessitating grade of 41a per cen on the railroad. The railroad is bull along the side of Dead Mans gulc
 and has 24-inch gauge and is lai