References
OUTOKUMPU NEWS, NUMBER 1, 1965, BY OUTOKUMPU OY, HELSINKIFINLAND.WORLD MINING, "PYHASALMI - LARGEST OUTOKUMPU MILL", NOV.,1968, P28."COURIER 300 ON-STREAM ANALYSIS SYSTEM", BY A. LEPPALA, J.KOSKINEN, T. LESKINEN, AND P. VANNINEN, PAPER IN,"TRANSACTIONS OF THE SOCIETY OF MINING ENGINEERS OF AIME -SPECIAL MINERALS BENFICIATION ISSUE", SEPTEMBER, 1971,VOL. 250, NO. 3, PP261 - 268."PYHASALMI", MINING MAGAZINE, NOVEMBER 1972, PP444 - 452."FINN MINERS DISPLAY ADVANCED TECHNOLOGY", BY W.H. HEWITT,CANADIAN MINING JOURNAL, DECEMBER, 1973, PP16-17, 24-25.OUTOKUMPU OY ANNUAL REPORT, 1976, PAGE 6."PYHASALMI'S ADVANCED AND COMPLEX PROCESS CONTROL", WORLDMINING, JANUARY 1978, PP39 - 41."FINNISH MINING PROCTICE", MINING MAGAZINE, DECEMBER, 1978,PP571, 573.OUTOKUMPU OY ANNUAL REPORT, 1979, PAGE 19."GEOLOGY OF THE PYHASALMI ORE DEPOSIT, FINLAND",O. HELOVUORI, ARTICAL IN, "ECONOMIC GEOLOGY AND THEBULLETIN OF THE SOCIETY OF ECONOMIC GEOLOGISTS", ISSN #0361-0128, VOL. 74, NO. 5, AUGUST, 1979, PP1084-1101.1979 E/MJ INTERNATIONAL DIRECTORY OF MINING, "PYHASALMI",PAGE 281."PYHASALMI AND VIHANTI CONCENTRATORS", MINING MAGAZINE,SEPTEMBER, 1983, PP176-185."AUTOMATED CONCENTRATORS OF OUTOKUMPU", WORLD MINING,"PROCESS CONTROL", MAY 1983, PP48-52."PIONEERING PYHSASLMI CONCENTRATOR", E&MJ, APRIL, 1984,PP62-68.PYHASALMI; COPPER, ZINC, SULPHUR OPENED IN 1962.OUTOKUMPU OY, PYHASALMI MINE, MINING IN FINLAND.BRITISH SULPHUR CORP. LTD., "WORLD SURVEY OF SULPHURRESOURCES", THIRD EDITION, 1985.E&MJ INTERNATIONAL DIRECTORY OF MINING, 1991AME MINERAL ECONOMICS QUARTERLY MINE ANALYSIS, JUN 93,P. 48.BROOK HUNT-1992, P.221-228.