270 



The Philippine Journal of Science 



1915 



The work on the outcrops at M and N has been too limited 

 to prove the extent of the deposit. About 100 tons of the mix- 

 ture of bitumen and clay-tuff has been mined. The surface 

 conditions indicate a considerably larger deposit in this vicinity 

 than in any of the foregoing. The thickness is greater, and 

 outcrops are found over an area of fair dimensions. It is claimed 

 by interested prospectors that exploration by drilling has proved 

 a thickness of about 15 meters over an area 300 meters square. 

 It is stated also that the same bituminous mixture is encountered 

 beneath the surface in the tovi^n of Villaba at a distance of 800 

 meters north of the outcrop at L. The exploration of the de- 

 posits at L and M would be a simple and inexpensive undertak- 

 ing, since the breccia of bitumen and clay-tuff appears to lie near 

 the surface. 



The quantity of rock asphalt at N undoubtedly is to be meas- 

 ured in thousands of tons. Although no exploration has been 

 undertaken, the dimensions of the exposed face make it certain 

 that there are present at least several thousand tons. If the 

 vertical dimensions of the deposit and its dimensions at right 

 angles to the exposed face are of the same order of magnitude 

 as the revealed length of the face — suppositions which are by 

 no means unreasonable — the total quantity of rock asphalt at 

 N must amount to hundreds of thousands of tons. 



THE UTILIZATION OF THE RESIDUAL BITUMENS 



If petroleum is obtained commercially in Leyte, no problem 

 arises as to its disposal. The Philippine market for petroleum 

 products amounted to 3,641,078 pesos ^" in 1914, according to the 

 import records of the Collector of Customs as shown in the 

 following table : 



Table IX. — Imports of petroleum products into the Philippine Islands 



in 191U. 



Petroleum product. 



Quantity. 



lAtei's. 

 1. 689. 108 



5, 508. 189 

 Illuminating oil ! 48.617.689 



Crude oil, including all natural oils without regard to specific gravity --. 



Refined or manufactured oil, naphtha, including all lighter products of 



distillation 



Lubricating and heavy paraffin oil _ 



Residuum, including tar, and all others, from which the light bodies have 

 been distilled 



Total 



3, 048, 610 



765. 182 



69, 528, 778 



Value. 



Pesos, 



48,360 



663, 408 



2, 562, 040 



426,258 



41,012 



3, 641, 078 



" One peso Philippine currency equals 100 centavos, equals 50 cents 

 United States currency. 



