134 135 cerro de pasco The greatest investment of the XXth century 1933 1937 1939 1940 1936 1935 1934 [ July ] The controversial Kingsmill tunnel, used to drain the Morococha mine, is completed. [ June 10 ] The installation of the Mahr Tunel concentrator is completed to process the mineral from San Cristobal and Morococha. A small plant produces sulphuric acid to meet the needs of the company and, later, the entire national market. The zinc electrolytic pilot plant produces its first zinc ingot. The Custodis Construction Co. begins construction of the Cottrell Central Chimney to treat smelter fumes. [ October 6 ] The Malpaso hydroelectric plant begins operations. Lead-bismuth alloys are produced for use in low-melting temperature alloys. Lead from the La Oroya pilot refinery is treated in the United States. Timeline 1930/ 1949 1943 1941–53 1946 1944 1949 1942 [ September 23 ] The company's largest concentrator plant, located in Cerro de Pasco, in the Paragsha area, begins operations. Raw antimony is recovered from Cottrell and smelter fumes. The Supervised Schools of the Company are organised in La Oroya, entrusted with the Supervision of Education, dependent on Industrial Relations. The pilot copper refinery begins operations in La Oroya. The Yauricocha mine becomes part of the Department of Mines. The production of copper sulphate begins to remove impurities from the electrolytes of the copper refinery.
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