IX, A, 3 Dalburg and Pratt: Iron Ores of Bulacan 



229 



Constancia ore; records of the Spanish , 



Inspecci6n de Minas. 

 Montamorong ore; furnace charge; ana- 

 lyzed by Forrest B. Beyer, Bureau of 



Science. 

 Montamorong ore; records of the Spanish 



Inspeccion de Minas. 

 Santol ore; spalls from bowlders; analyzed 



by Forrest B. Beyer, Bureau of Science. 

 Santol ore; furnace charge; analyzed by 



T. Dar Juan, Bureau of Science. 

 Tumutulo ore; furnace charge; analyzed 



by Forrest B.Beyer, Bureau of Science. 

 Macatalingaore; furnace charge; analyzed 



by Forrest B. Beyer, Bureau of Science. 

 Mayapo ore; furnace charge; analyzed by 



Forrest B. Beyer, Bureau of Science. 

 Magnetite from Hongkong, China; Bull. 



Am. Inst. Min. Eng. 3, 86. 184. 

 Magnetite from Sweden. 

 Magnetite from Cornwall, Pennsylvania. 

 Hematite, Mesabi Range, Minnesota. 



0.108 



0. 036 



0.274 

 0.194 

 0.288 



0.057 



0.035 



0.161 



0.061 



0.061 



0.004 



0.003 

 0.007 

 0.062 



60.34 

 61.71 



67.48 



65.91 



57.72 



51.72 



57.46 



62.37 



66.75 



57.18 

 57.05 

 58.83 



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