vin, a, 2 Edding 'field: Ores of the Philippines 97 



Antamok Valley veins. — The characteristic veins of this sec- 

 tion are represented by the Headwaters, Camote-Clayton, Gomok, 

 and Eileen. These are made up of compact calcite, manganese, 

 and varying amounts of quartz. In general the manganese bands 

 representing secondary ore contain the highest values, but high 

 assays are also obtained from the quartz and calcite. However, 

 the last two are very irregular in the distribution of values, and 

 are barren in many places. 



No honeycomb quartz was found in this region. This circum- 

 stance, together with the regularity of the calcite content of the 

 veins, leads to the conclusion that in certain instances the quartz 

 was deposited in the fissure first, and that a second Assuring took 

 place, after which the calcite was deposited. Veins are found 

 containing quartz and manganese without any calcite, as in the 

 Benguet Consolidated and the Madison; and of veins of calcite 

 without manganese, as in the Capitalist. Veins are also found 

 in this section without calcite or manganese, but they have not 

 been developed, although some of them are worthy of exploita- 

 tion. The most prominent are the Otek, Emma, and the Sunrise 

 Fraction. 



The gold is about 30 per cent free-milling (30-mesh), and is 

 occasionally found as small specks or plates that can readily be 

 seen in the ore ; iron pyrite is abundant in the quartz veins, but 

 is subordinate in the calcite-bearing veins. Several mines have 

 been successfully operated in this section. 



Itogon River. — In this section calcite veins predominate, 

 although one large vein, the Lincoln Fraction, was found con- 

 taining quartz and calcite. The main calcite veins are the 

 Capitalist, Hamilton, Wheeler, and Jefferson. These veins carry 

 small values in gold, and have never been properly prospected. 



Gold Creek. — The principal veins are large, strong, quartz 

 veins, striking nearly east and west. Among these are Kelly 

 No. 3, Kelly South Slope, Muyot, Midas, Lorenzo Pao, and Tejon 

 Dike. Several veins striking northeast and southwest are found 

 on the Kelly, Mayon, and Ascension groups. 



An irregular arrangement of veins occurs in the Kelly North 

 Slope group. Here four veins are found having different strikes, 

 which results in several intersections within the property (fig. 

 3) , each vein cutting at least one other group. Another feature 

 peculiar to this group is the occurrence of telluride ore in the 

 veins, and the comparative absence of free gold. 



In the Major group are a large number of veins striking 

 northeast-southwest. Many of them are contact deposits be- 



116737 2 



