OCR

Stage IV of the program included the magnetic concentration facilities, a steam-driven electrical generating station, and a pellet Plant, which produces 3/8 inch pellets from fine grind concentrated ore. The fine grinding assists in concentrating the ore and pelletizing prepares the fines for use in a blast furnace. Stage V of the program included new crushing and screening facilities at the mine. One of many interesting features of the new facilities is the down- hill conveyor, a 36-inch wide belt which transports the ore for about 1-1/2 miles. Because it runs downhill, the conveyor when loaded drives the conveyor motors (instead of vice versa) and thus generates 1,000 kilowatts of electric energy which is fed into the electrical network. The Utah crew on this project consisted of approximately thirty Americans, a number with long experience in Peru, at San Juan and Toquepala. They were led by K. J. Rowe, Project Manager; Wendall Pauling, Construction Superintendent; Jose Arguedos, Project Engineer; and John McCausland, Administrative Manager. Design engineering was handled by Utah's Design Section under Chief Design Engineer, R. H. Hunt, - and Project Engineer, A. H. Soderquist. It should be stated further that June of 1963 was a banner month for this Project. Crushing plant First of the June start-ups was the Primary-Secondary Crushing and Stockpiling Facility. This installation which is located between mines 2 and 5, provides for increased crushing capacity at the mine area. An interesting feature of the new crushing plant is that it is entirely under- ground, except for the hoisting facilities provided for servicing the equipment, and the dust collector. This crusher extends 73 feet below the ground surface--the equivalent of more than six stories. The great advantage of this underground design is that it permits the ore trucks to dump directly into the cavity of the Primary crusher, which is a 48" Allis -Chalmers Gyratory Crusher with a 500 h.p. motor. From the Primary Crusher, the material discharges to two 5' by 10' Hydrostroke Feeders (National Iron Company) which feed the two Secondary 7' Standard Heavy Duty Crusher (Nordberg-Symons) each with a 300 h.p. motor. Stockpiling The ore from the Secondary Crusher goes to an inclined conveyor, 42 inches wide and 500 feet long, which lifts the ore a total of about 140 feet and discharges it onto a tripper conveyor, which deposits the ore onto the stockpile area. This conveyor is supported by bents of unique design - like inverted U's - which permit a stockpile area completely free