I; ■:;;;■■ 



THE PHILIPPINE 



Journal of Science 



A. Chemical and Geological SciflNCES 

 AND THE Industries / 



Vol. VI DECEMBEE, 1911 No. 6 



ADDITIONAL NOTES ON THE ECONOMIC GEOLOGY 

 OF THE BAGUIO MINERAL DISTRICT.* 



By Warren D. Smith and Frank T. Eddingfield. 

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



CONTENTS. 



I. General Geology. Okigin or the Veins and Ose 



Introduction. Deposits. 



Igneous Rocks. Oxidized and Sulphide Zones. 

 The dioiite. II. Economic Geology. 



Tertiary lava8. Gold. 



Lower andesite. The nonmetallic minerals and 



Upper andesite. structural materials and their 



Andesite bi-eccia. economic possibilities. 



Intrusives. Limestone. 



Sedimentaries. Silica. 



Major Creek formation. Sand-lime brick. 



The Baguio formation. Glass sand and pottery 



Later sedimentaries. glaze. 



Geologic History. Brick clay. 



Structure. Road metal. 



Mineral Veins. Summary. 

 Minerals in the Benguet 

 Lodes. 



I. GENEIt.lL GEOLOGY. 

 INTRODUCTION. 



In his notes on the Geology and Geography of the Baguio Mineral 

 District,^ Eveland discussed the various classes of igneous rocks in this 

 region. It will not be necessary to add many details to his description 

 but it is necessary to give some further statements regarding distribui 

 and relationships. 



* An extended description of the various mining properties in this distri 

 has already been prepared and will be included in The Mineral Resources, 191. 

 and also in one of the technical journals in the United States. 



'This Journal. Sec. A (1907), 2, 207. 

 3 06090 429 



