Pacococha

PERSONAL CORRESPONDENCE, 1978.MINING AND MINERAL PROCESSING OPERATIONS. PERU. MCGRAW-HILL, INC., NEW YORK, 1978, P. 328.RIO TINTO ZINC MINING ANALYSIS SYSTEM. LEAD AND ZINC MINESOF THE WORLD (ZINC). MARCH 25, 1975, P. 22.OF THE WORLD (LEAD). MARCH 25, 1975, P. 20.RIO TINTO ZINC MINING COST ANALYSIS SYSTEM. PERFORMANCEANALYSIS. FEBRUARY 25, 1975, P. 286.ANALYSIS. MAY 27, 1975, P. 407.WORLD MINES REGISTER. COMPANIES BY COUNTRY. PERU. MILLERFREEMAN PUBLISHING, INC., SAN FRANCISCO, 1979, P. 150.SAME REFERENCE AS "A" ABOVE.