﻿» 

 BAGUIO MINERAL DISTRICT. 209 



Baguio, from which point at least the more elevated portions of the area 

 could be reached by aid of a horse. A general geologic reconnaissance 

 of the district extending beyond the mapped area, in order fully to grasp 

 certain broader problems was followed by a more detailed study of the 

 geologic relations of the smaller area. The perhaps extraordinary 

 occurrence and sequence of geologic phenomena in so limited an area 

 "made this portion of the work extremely interesting, and, needless to 

 add, correspondingly difficult. 



Within a comparatively limited field, the study of recent vulcanism 

 reveals lava flows of different ages, igneous intrusions of notable extent 

 and the still active evidence of numerous hot springs; ore deposits are 

 encountered of undoubted value and extent, varying in type from free 

 milling gold ores to "basic" gold-bearing sulphides of copper, lead, zinc 

 and iron; sedimentary beds with a rich fauna can be seen, the study 

 of which may be vitally important to broader questions of the former 

 extent of the Philippine Islands, or rather their connection with con- 

 tinental areas; rarely can such a combination be found, both as to the 

 interest to the scientist and the value of knowledge to be gained from 

 an economic standpoint. 



With the information acquired by me, the way was clear to a closer 

 study of smaller areas from a purely economic basis. It was possible 

 by camping at the different places where prospecting and mining opera- 

 tions were going on thoroughly to examine every opening of importance. 

 Ores and veins were inspected, faults measured — in short, all that was 

 necessary was done to attain the total of information, so far as it might 

 be derived from the present stage of the district in mine development. 

 Numerous samplings and assays aided in the work, and in addition some 

 underground surveys were made where vein structure or dislocation made 

 it advisable. 



In the field, excepting in rare instances, every assistance and coopera- 

 tion was met with. The natives, miners and others with whom it was 

 necessary and desirable to come in contact made smooth many rough 

 paths, and this brief acknowledgment of those courtesies and aids may be 

 taken as but a fraction of the appreciation of the writer. 



It is a pleasure to record the aid of my colleague Mr. W. D. Smith 

 in determining and classifying the fossil remains of this region while I 

 was studying and working on field material during the preparation of 

 this report, and in that connection no little cooperation was rendered by 

 him in aiding me to an understanding of the paleontology and the 

 petrography of the region; this will be spoken of later. I also desire 

 to express my appreciation of three weeks' assistance in the field given 

 me by Mr. Smith. 



