Chilex then went ahead with the development and construction of a mine on the eastern section of the Chuquicamata field. (It acquired the remainder of the field gradually over the next 15 years). The 10,000 tons per day leaching plant was planned to produce 50,000 tons of electrolytic copper annually. Amongst the equipment purchased were steam shovels from the Panama Canal. A port and an oil-fired power plant were built at Tocopilla, to the west and an aqueduct was constructed to bring water in from the Andes. Production started on May 18, 1915. Actual production rose from 4,345 tonnes in the first year to 50,400 tonnes in 1920 and 135,890 tonnes in 1929 before the Depression hit and demand fell.