X, A, 5 



Pratt: Persistence of Philippine Coal Beds 



293 



upon the excavation of a transverse drainage tunnel from the 

 lov^^est practicable point to the extension of the large vein at 

 depth. 



This tunnel was driven through shale and sandstone a total 

 distance of 647 meters and actually reached the large bed. But 

 shortly after its completion the lady whose enterprise was re- 



^ 



Scale 



2 3 



s Meters 



Fig. 1. Plan of Esperanza gallery at Compostela coal mine, Cebu, showing its passage 

 through a fault, with sections across gallery at a, 6, c, and d. 



sponsible for the successful termination of the undertaking, 

 which in that time must have been very difficult, died, and her 

 work was allowed to fall to ruin. The tunnel encountered three 

 other smaller beds of coal before it finally reached the large bed, 

 and these results were carefully recorded by the engineers of 

 the Spanish inspectorate. Abella estimated that a minimum 

 quantity of 600,000 tons of coal was developed with reasonable 

 certainty by this work, and the persistence of the large bed was 



