THE PHILIPPINE 



Journal of Science 



A. Chemical and Geological Sciences 

 AND the Industries 



Vol. IX JUNE, 1914 No. 3 



THE IRON ORES OF BULACAN PROVINCE, P. I. 



,By F. A. Dalburg and Wallace E. Pratt 

 (From the Division of Mines, Bureau of Science, Manila, P. I.) 



One map, 6 plates, and 6 text figures 



contents 



Introduction. 



General statement. 



Scope of the present paper and sources of information. 



Summary of principal results obtained. 

 Geology. 



Situation of the ore deposits. 



Physiography. 



General geologic relations. 



Sedimentary rocks. 



Post-Miocene formations. 

 Miocene formations. 



Igneous rocks. 



Effusive rocks. 

 Intrusive rocks. 

 Deep-seated rocks. 

 Economic Geology. 



General character of the ores. 



General character of the ore deposits. 



The Camaching ore deposit. ^___ ^ . ^.„;j,^ 



The Montamorong ore deposit. /'^^t\SO<^lS'l ^^^W^J^. 



The Hison-Santa Lutgarda-Constancia ore deposit. /^"^ ^/;> 



The Santol ore deposit. 



Minor ore deposits. 

 Chemical Composition of the Ores. 

 Genesis of the Ores. 

 Quantity of Ore Available. 



127944 201 



