Bisbee daily review., 1908-03-29
I00,000,O0O
 TONS IF ORE
 BLOCKED OUT
Utah Copper Company Ready to Supply Garfield concen- trator Now About Ready to Run-Cost $3, ,0O0, 900.

At the present time there stands blocked out in the mines belonging to the Utah Copper Company more than l0O,OO0,000 tons of ore, the milling oi which will probably be done at the new Garfield Conce1trator plant just brought to completion. Tais is esti. mated to have cost three million dol. lars, including a $750.000 power plant The concentrator buildings are To- cated sixteen miles east from Salt Lake City, on slope facing the lake The plant is fed. by means of the Bingham branch of the Rio Graade Western railroad from the company's mines in Bingham canyon. It is de signed to treat 5000 tons of porphyry daily with a copper content varying from 1.5 to 2.5 The resulting con- centrates carry more thal 50,000 pounds o1 copper.
 Ore is received in a bin with a hold. ing capacity of 5000 tons or six days supply. The concentrator proper is divided into twelve separate groups each a complete unit in itself and having a capacity of 800 tons, the ma. chinery of which is driven by means of induction motors.
 
 lecting cars, then discharged through centrally placed bottom gates directly onto the grizzlies over the hoppers of Tour No. 71k type "K' Gates Gyratory Breakers. built by Allis-ChaImers Company, Milwaukee, each having C capacity of 100 tons per aour. These crushers are fed through discharge pockets with vertical gates operated .x,.HH Ox,Ix- tst- from the grizzlies goes to the crush CTS; the under size passes along to the first set of trommels, of which there are two each of the Gates crushers.
 Elevated to the mill top, the dry coarse crushed ore is screened wet through the No. 10 mesh screen. Pulp passing the screen is classified and then sent to the jigs. The con centrator floors are occupied by sev- enty-two jigs, 1,104 six-feet vanners and firty-eight concentrating tables Each oF the twelve mill sections may be operated entirely independently from the others. S /
 The power for operating the coarse crushing machinery is supplied from four 15O horsepower, three-phase, in- duction motors, 440 volts. Each mo tor is belted to a line shaft which drives a gyratory crusher, set or roughing rolls, two trommels and ele- vators.
 A power station having nearly H- OO0 horsepower capacity is required for the operation of the main mill and a small TOO ton mill at Bingham canyon originally built as an experi- mental plant. The power house, built of reinforced concrete brick and steel, 15S feet ot 228 feet, stands short distance below the mill. Twen- ty water tube boilers of the Heine type, built by the Risdoa Iron works of San Francisco furnish boiler ca pacity of 500 horsepower each for reciprocating engines direct connect ed to three-phase alternating current generators. Two of the engines were built by llAis-Chalmers company or Milwaukee. They are horizontal cross compound Reynolds Corltss units of the heavy duty type, with cylinders fifty-four inch by forty-eight inch stroke and designed to develop normally 1,50O horsepower each 100 R. P. M.
 Messrs. J. G. White and company acted as consulting engineers for the plant. Power is generated at 4,00n volts which is stepped down to 44O volts for use in the mill. Power Tor Bingham canyon mines and mill is transmitted overa fifteen mile line at 10000 volts.