References
USGS (1946), TOPOGRAPHIC MAP OF SOUTH RANGE QUADRANGLE, HOUGGHTON COUNTY, MICHIGAN, 7.5 MINUTE SERIES : UNITED STATESDEPARTMENT OF THE INTERIOR GEOLOGIC SURVEY.WHITE,W.S. (1968), THE NATIVE-COPPER DEPOSITS OF NORTHERNMICHIGAN: IN ORE DEPOSITS OF THE UNITED STATES, 1933-1967.RIDGE,J.D.-EDITOR, VOL.1: THE AMERICAN INSTITUTE OF MINING,METALLURGICAL, AND PETROLEUM ENGINEERS, INC, NEW YORK.BRODERICK,T.M., HOHL,C.D.,EIDEMILLER,H.N. (1946), RECENT CONTRIBUTIONS TO THE GEOLOGY OF THE MICHIGAN COPPER DISTRICT:IN ECONOMIC GEOLOGY AND THE BULLLETIN OF THE SOCIETY OF ECONOMIC GEOLOGISTS, VOL.XLI.BUTLER,B.S., BURBANK,W.S. (1929), THE COPPER DEPOSITS OFMICHIGAN: USGS PROFFESSIONAL PAPER 144.CORNWALL,G.R., RUNNER,J.J., STROMQUIST,A.A., SWANSON,R.W.,WHITE,W.A. (1949), DETAILED GEOLOGIC MAPS OF RECENTLY ACTIVECOPPER MINES, HOUGHTRON AND KEWEENAW COUNTIES, MICHIGAN:UNITED STATES GEOLOGICAL SURVEY.HORE,R.E. (1914),MINERAL RESUORCES OF MICHIGAN:ANNUAL REPORTOF THE BOARD OF GEOLOGICAL AND BIOLOGICAL SURVEY FOR 1914.PUBL. 19 GEOLOGICAL SERIES 16.ALLEN,R.C. (1910), MINERAL RESOURCES OF MICHIGAN: ANNUALREPORT OF THE BOARD OF GEOLOGICAL AND BIOLOGICAL SURVEY FOR1911. PUBL. 8 GEOLICAL SERIES 6.SCHACHT,W.H. (1922) THE MINING METHODS OF THE COPPER RANGECOMPANY, HOUGHTON COUNTY, MICHIGAN: PROCEEDINGS OF THE LAKESUPERIOR MINING INSTITUTE TWENTY-SECOND ANNUAL MEETING (MICHIGAN COPPER DISTRICT) HELD AT HOUGHTON, MICHIGAN, AUG 28,29,30, 1922.GREGORY,C.E. (1973), APPENDIX D WEIGHTS OF VARIOUS ROCK MATERIALS: IN EXPLOSIVES FOR NORTH AMERICAN ENGINEERS: SERIESON ROCK AND SOIL MECHANICS, VOL.1 NO.4.PARDEE,F.G. (1929,1930,1931,1932), PRIVATE REPORT TO THESTATE TAX ASSESSOR ON THE BALTIC MINE: STATE OF MICHIGAN