ECONOMIC GEOLOGY OF "THE BAGUIO DISTRICT. ^Q^l- 



. ■: .:KAOIiINI.TB ; (JJiai^ai^Oo) ; ' : 

 Probably not.-pui'e, occurs as part of the clayrgouge' next to the -vein wall*- ■■ 

 TALC (HoMgatSiOa),). 

 • Mixed with kaolin as an amorphous mass. 



'." ■ LIMONITE (gFeaOg. 3H2O). , '' 



This is. found as a yellowish stain in the veins in the oxidized zone. It is. a 

 result of the alteration of the pyrite in part and the decomposition of ferruginous 

 wall rocks. 



HEMATITE (FeoOj). 



This is a reddish incrustation originating in the same manner as the-limonite; 

 it also occurs as small, hard, bluish-gray flakes and particles which remain in 

 the pan when panning for gold. 



" PYRITES (FeSj). 



.This mineral is intimately associated with the gold, often enclosing minute 

 gold' particles. Occurs universally in the veins and also in the country rock. 



GALENA (PbS). 



This lead-gray, hea\'y mineral with its characteristic cubical cleavage, yield- 

 ing silvery bright faces, has been found in small quantities only, associated with 

 a small amount of sphalerite and chalcocite in a few veins in Gold Creek. 



CHALCOCITE (CujS). 



This mineral occurs both in the massive form and as slender orthorhombic 

 crystals in several places in the veins on the Kelley property. 



MALACHITE (CuCOs . Cu(0H)2). 



Occurs as occasional bright gi'een incrustations in the Gold Creek lodes. 



CHALCOPYRITE (CuFeSj). 



Only occasionally seen and usually as small, irregular, and amorphous pieces. 



CHROMITE (FeCraOi). 



Found in some of the Major Creek lodes as small botryoidal masses; black, 

 with a sublustrous to dull appearance. 



SIDERITE (PeCOa). 



Found in some lodes in the lower Antamok in compact and earthy fragments. 

 Color brown. Not very prominent. 



MAGNETITE (FeaO.,). 



Occurs as small grains in many of the ores. 



ILMENITB (FeTiOa). 

 Occurs, with magnetite. 



OLIVINE (Mg. Fe2)Si04). 

 Probably derived from some decomposed basaltic inclusion in the vein. 



