VOLUME XXIII NUMBER 5 



THE 



JOURNAL OF GEOLOGY 



JULY-AUGUST 1915 



THE GEOLOGY OF CENTRAL MINAS GERAES, BRAZIL 



E. C. HARDER 

 Washington, D.C. 



AND 



R. T. CHAMBERLIN 

 University of Chicago 



PART II 



Principal Mineral Deposits 

 Iron Ores 



Bedded Ores 

 Concentration Ores 

 Origin of the Bedded Ores 

 Manganese Ores 

 Gold 

 Diamonds 



PRINCIPAL MINERAL DEPOSITS 



IRON ORES 



On the basis of their physical properties, which to some degree 

 separates them also according to chemical composition, the iron 

 ores^ of Minas Geraes may be classified as follows. 



^H. K. Scott, "The Iron Ores of Brazil," Jour. Iron and Steel Institute, LXI, 

 (1902), 248; O. A. Derby, "The Iron Ores of Brazil," Iron Ore Resources of the 

 World, p. 313, Stockholm, 1910; C. K. Leith and E. C. Harder, "The Hematite Ores 

 of Brazil and a Comparison with the Hematite Ores of Lake Superior," Econ. GeoL, 

 VI, (1911) 670-86; E. C. Harder, "The 'Itabirite' Iron Ores of Brazil," Econ. 

 GeoL, IX, (1914) loi-ii; E. C. Harder, "The Iron Industry in Brazil," Btill. Am. 

 Inst. Mg. Engrs., October, 1914. 



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