106 107 cerro de pasco The greatest investment of the XXth century 1922 1927 1926 [ November 23 ] The La Oroya smelter produces its first blister copper bar. The blister copper is shipped to Cataret, NJ, until the La Oroya refinery can treat all production. The La Oroya smelter enters production and the closure of the Smelter and Casapalca smelters begins. The Metallurgical Research Department is created in La Oroya. [ April 13 ] The Amistad concentrator plant is inaugurated in Morococha. The lead recovered from Casapalca minerals is treated by several companies, including ASARCO. Timeline 1922/ 1930 1928 1929 1928–30 1928–29 [ September ] The central shaft of the Morococha mine is inaugurated. The experimental production of refined bismuth and also of the lead-bismuth alloy begins in La Oroya. Gold is produced from blister copper and refined lead in the US. Additional gold ounces come from the lead-bismuth alloy. Silver is recovered from valuable impurities in USrefined blister copper, lead, and lead-bismuth alloy.
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