References
HEINRICHS, W.E., JR., PIMA DISTRICT, ARIZONA, A HISTORICALAND ECONOMIC PERSPECTIVE, AIME 105TH ANNUAL MEETING, LASVEGAS, NEVADA, FEBRUARY, 1976, 15 PP.HEINRICHS, W.E., JR., AND R.C. THURMOND, A CASE HISTORY OFTHE GEOPHYSICAL DISCOVERY OF THE PIMA MINE, PIMA COUNTY,ARIZONA, GEOPHYSICS, V. 19, NO. 3, JULY, 1954, PP. 600-12.MINING WORLD, USE OF GEOPHYSICS PAYS OFF AT PIMA WITH DIS-CLOSURE OF COPPER OREBODY, OCTOBER, 1954, PP. 42-5.PAYDIRT, PIMA MINE'S INCREASED PRODUCTION ON STREAM,JANUARY 29, 1973, PP. 1,3.SKILLINGS, DAVID N., JR., PIMA MINING COMPANY, SKILLINGSMINING REVIEW, V. 61, NO. 12, MARCH 18, 1972, PP. 16-9.SKILLINGS MINING REVIEW, EXPANSION AND IMPROVEMENT AT PIMACOPPER MINE, V. 62, NO. 37, SEPT. 15, 1973, PP. 1, 8-10.MILLINGBASSAREAR, J.H., AND H.W. SORSTOKKE, PIMA EXPANSION FOURUSES SEMIAUTOGENOUS GRIND, AIME TRANS., V. 254,DECEMBER, 1963, PP. 297-300; MINING ENGR., MAY, 1973,PP. 37-9.COBURN, JAMES, ET.AL., CYPRUS PIMA MINING COMPANY, PRES.AT ARIZONA AIME SPRING MEETING, MINERAL PROCESSING DIV.,TUCSON, ARIZONA, MAY 17, 1974, 29 PP.DAYTON, STAN, THE QUIET REVOLUTION IN THE WIDE WORLD OFMINERAL PROCESSING, E & MJ, JUNE, 1975, PP. 87-8.ENGR. AND MIN. JOURNAL, E & MJ FLOWSHEET PORTFOLIO, JUNE,GEOLOGY AND HISTORYCOOPER, J.R., SOME GEOLOGIC FEATURES OF THE PIMA MININGDISTRICT, PIMA COUNTY, ARIZONA, U.S.G.S. BULL. 1112-C,1960, 103 PP.ENGINEERING AND MIN. J., JUNE, 1977, P. 104.RESERVES AND QUANTITYENGINEERING AND MINING JOURNAL, LARGE TRUCK FLEET AT PIMAMAKES LONG STEEP HAUL, JUNE, 1977, PP. 104-105.STANDARD OIL COMPANY (INDIANA) 1982 ANNUAL REPORT, 1983,P 34.ENGINEERING AND MINING JOURNAL. LARGE TRUCK FLEET AT PIMAMAKES LONG STEEP HAUL, JUNE 1977, PP. 104-105.