OCR

the halo zone of low grade material were incorporated as a part of the entire ore body. After extensive study, it was decided that the deposit could be more profitably worked as an open pit mine. In the Fall of 1955, Cyprus Mines Corporation exercised its option and assumed management of Pima Mining Company. Union Oil Company retained a 25 percent interest and a 25 percent interest was sold to Utah Construction Company. In November 1955, Utah Construction Company started removal of the overburden over the main ore body. In April 1956, Pima started its own stripping operation alongside the Contractor. Utah completed its stripping contract on October 1, 1956 after having stripped 6 million yards of alluvium and waste rock. (Pima had stripped an additional 3 million yards of waste material during the time Utah was working in the pit). Pima moved its offices to the mine site on June 1, 1956. All efforts were concentrated on completion of the mill, auxiliary buildings and the water supply system in order to get the mine into production. Plans were underway for a County Road due east of the mine which would shorten the haul of concentrates to our railroad spur on the Nogales Highway. Ore was being stock- piled for processing in the mill. At 8:40 AM on December 15, 1956, the first load of rock was dumped into the crusher for a preliminary tryout. The mill turned over for the first time on December 21st and on December 28th, the first concentrates were made. Pima started its shipments of concentrates to the El Paso smelter on January 4, 1957. 13 - Walnut Processing Plant in California for Stockton Enterprises Inc. in the amount of $5,660,000. 14 - Industrial Building in Salt Lake City, Utah, for Cate Equipment in the amount of $173, 500. 15 - Engineering Plant and Facilities in Utah for the Sperry Rand Corporation in the amount of $621,500. 16 - Mendocino Hospital in California for Mendocino county in the amount of $909,000.