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Show SUBSTATIONS AND TRANSMISSION MINES Construction performed under this major category included: Ilo Power Plant Substation Toquepala Mill Substation Main Transmission Line, 133 KV, 65.5 miles long 13.8 KV Subtransmission Lines, from Ilo Substation to Smeltor Camp, 11.5 miles Smelter Camp to Ilo Port, 2.5 miles Ilo Port to Coquina Plant, 6.5 miles 11 KV Subtransmission Lines, from Mill Substation to Mine & Mill Camps, 4 miles Mill Substation to Mine Power Plant and Pit Distribution, 6.4 miles Mill Substation to locomotive Running Repair Shop, 1.2 miles Primary Communication Systems Contract for final location surveys of the 138 KV power transmission line from the Ilo Power Plant to the Toquepala mill was let by Southern Peru Copper Corporation to, and work was accomplished by, H. C. Hughes Associates of Salt Lake City in 1957. Contractor construction began in February 1959. Engaged manpower peaked at 144, the line was completed on May 22, 1959, and on June 29, 1959 the line was energised. The 107 kilometers of line contain Z19 conventional wood pole structures, with seven structure types represented incorporating from 2 to 5 roles each. The 926 erected poles are entirely Class I, treated red cedar, ranging in length from 10' to 85'. Conductor for the considered coastal section, 16.6 miles in length, is 300 HCH Copper except for the Ilo river valley crossing, which is 300 HCH Copperweld Copper, Type E. Conductor for the upland i miles is 477 MCM Aluminum Cable Steel Reinforced. The system employs conventional overhead ground wires. Longest clear spans are the 675 meter (2,213') Ilo river valley crossing and the 673 meter (2,207') Quobrada Cimarrona crossing. For construction of the middle third of the line, crews utilizes the temporary camp erected for rail- |