IG 



Iwasaki ; 



80 X 



Fig. 4.— Qnartzose gold ore of the Hasami Mine. Q, Quartz 

 containing liquid enclosures, in parallel or radial arrange- 

 ment. P, Pores connected by passages with 

 a lining of siderite. 



sandstone and sliale, the 

 former being the more 

 important of the country 

 -rocks. Quartz-trachyte 

 is found in this con- 

 cession, and is supposed 

 to he the ore-bringer of 

 the gold A'eins. Several 

 veins are met with run- 

 ning N. 45° W., and dip- 

 ping 70°-80° SW. They 

 are mostly simple veins, 

 about 5 feet thick, but 

 sometimes assembled 

 together, attaining even 

 100 feet in thickness. 

 Usually the simple 



veins are reg 



ular 



m 



80X 



Fig. 5. — Colony of gold in the quartzose gold 

 ore of the Hasami Mine. 



extent, with distinctly 

 banded or brecciated 

 structure. The ores 

 now being worked are 

 stained by limonite, 

 for they belong to 

 the weathered zone. 

 When the working 

 proceeds deeper, much 

 sulphide is expected. 



Under the micro- 

 scope, the quartz in 

 the gold ore shows a 

 granular or hyp- 

 idiomorphic struc- 

 ture. (Fig. 4.) The 

 outline of the quartz is 

 always smooth, in 



