MINERAL RESOURCES OF AROROY DISTRICT. 421 



ore, assaying 10 grains or over to the ton, occurs in irregular masses near the 

 footwall. The Nancy No. 2 is situated near this vein and branching from it. 

 This is smaller than the preceding, but contains patches of rich ore. The two veins 

 join on the surface some distance to the southeast and also appear to approach 

 in depth. Both seem to be cut off by the Mabel, an east and west vein nearly 

 parallel to the Pirate vein, and about 300 meters to the south. An inclined fault, 

 approximately parallel to the strike and following the grade of the steep hillside, 

 seems to have displaced the upper portions of both veins. The upper level is for 

 the most part less than 30 meters below surface, and the larger vein has rather 

 irregular boundaries, surface slipping having greatly confused the relations of 

 ore and country rock. As the vein forms the summit of the hill, the steep slope 

 on the eastern side is deeply covered by a talus consisting almost entirely of 

 quartz fragments. The ancient miners found this a profitable field, for stone 

 mortars and pestles are found here in great numbers. It has been proposed to 

 work this on a larger scale, but preliminary sampling by a series of small pits 

 and open cuts, which, however, were not continued to bed rock, did not show 

 sufficiently satisfactory values. 



Another group of four veins has been developed to some extent by the same 

 company on the Nebraska Star claim, some 400 meters to the east. Here the 

 veins are narrower, at the widest never exceeding 4 meters, and then seem to pinch 

 out to the northwest. The two which are farthest to the east are united at the 

 surface and separate some 4 meters below. The ore, especially in the larger 

 vein, is somewhat less oxidized and contains more calcite than in the Nancy veins. 

 The best examples of the blue-gray calcite are to be found here. A mass of 

 oxidized, iron-stained quartz occurs on the Have Got claim, about 400 meters 

 southeast of the Nebraska Star veins, and possibly is a continuation of them. 

 The workings have been caved for several years so that nothing definite could be 

 learned of its relations. It appears to be a rather irregular, funnel-shaped body, 

 possibly a local widening of smaller veins. The country rock surrounding this 

 deposit is also reported to have carried a considerable proportion of values. 



The above comprise the more important veins of the Aroroy region as now 

 developed. Boston Hill, the southeastern continuation of Kalakbao, is known to 

 contain several veins, one of which, rather narrow and of white quartz stained 

 with iron oxide, shows in places unusually high values at the surface. 



An interesting series of ancient workings on the Gilt Edge claim, on the 

 southern end of Mount Kalakbao along a vein which, contrary to the usual rule, 

 contains, even at the surface, a large proportion of calcite, can be seen to this day. 



The property of the Tengo Mining Company is located 6 kilometers to the 

 south of Mount Kalakbao. Here, one large vein, with possibly others parallel 

 to it, outcrops on a spur of Mount Cogran. Not enough development work has 

 been done as yet to determine with any certainty the relations of these veins. 

 The ore is a somewhat brecciated quartz much stained with iron oxide, and in 

 places near the surface carries values much higher than the average for the dis- 

 trict. No extension of the Cogran veins to the northwestward has been found. 

 There is no evidence that they have any tendency to pinch out at the northwest 

 end of the spur, and it is possible that they are cut off by a fault. 



Higher up the Guinobatan River to the east of Mount Vil-lon is a group of veins 

 now worked by Mr. Hayes and his associates. These do not seem to follow the 

 dominant northwesterly trend exhibited in the Aroroy district, but are supposed 

 to form a network. Other deposits are said to exist in the main range still 

 farther to the southeast, and it is quite probable that further prospecting will 

 develop new districts in this inland region. 



