206 



The Philippine Journal of Science 



1914 



which obtain. The situation of the ores in a difficultly accessible 

 region makes them less readily available than other known ores 

 in the Philippines. 



GEOLOGY 



SITUATION OF THE ORE DEPOSITS 



The Bulacan iron ores occur along a north-south line which 

 lies near the western border of the Eastern Cordillera of Luzon 

 (fig. 1). Discontinuous exposures are found over a total length 



12100 



IS'OO 



15*00 



IZI'OO 



Fig. 1. Outline map of central Luzon, showing situation of Bulacan iron-ore mining region with 



respect to Manila. 



of 15 kilometers, the southernmost exposure being about 8 kilo- 

 meters northeast of the town of Angat, Bulacan. Further east, 

 near the axis of the cordillera, are several minor deposits, and 

 at Santa Inez and Bosoboso in Rizal Province, some 45 kilo- 

 meters to the south-southeast, are other iron ore deposits similar 

 in general character to those near Angat.^ Only the Bulacan 

 ores are to be discussed in this paper. 



The town of Angat is almost due north of Manila, and is distant 

 some 60 kilometers by the main routes of travel. It is situated 



"Adams, G. I., This Journal, Sec. A (1910), 5, 106. 



