Metallogeny of the Japanese Is-land?. ] ji 



Arguing from the arrangement of the minerals in the ore- 

 deposit, I have come to the conclusion that the order of the- 

 petrification of emanations in the Kamaishi Mine must have been 

 as follows: magnetite, garnet, quartz, gold, and calcite. 



As a typical example of the mineral veins in the Kitakami 

 Province, I shall here choose the Shikaori Mine, not very far from 

 the Kamaishi Mine. The deposits of this mine are bedded veins 

 running S. 5° W. along the stratification of the Paleozoic formation. 

 As in the case of the Korean Province, the ores are composed of 

 the hard translucent quartz of a whitish colour, Avhich is characte- 

 ristic of the so-called old vein of Prof. Vogt. The gold content in 

 the ore is very variable. As a whole the ore is not very rich, l)ut 

 big nuggets have sometimes been found in the veins. A nugget 

 called " monster "^^ consists of thick plates of gold in the cracks of 

 the quartz ore. The fineness of the gold is estimated at 882.844 

 and the nuggets 910 grammes in weight. From the specific- 

 gravities of the quartz, the gold, and the nugget, I have estimated 

 its value at 950 yen. This is one of the largest nuggets ever got 

 from mineral veins in Japan, and is considered to be one of the- 

 best specimens of the kind in the world. Gold veins containing 

 coarse grains of gold disposed in an irregular manner are also often 

 found in this province, and constitute the source of gold placers. 



7. The Besshi Province. 



This metallogenetic province comprises the entire outer zones^ 

 of South Japan and the Ryûkyû Arc, and the southern part of the 

 outer zone of North Japan. In this province, the pyrite beds are 

 most important — stibnite and gold veins as well as manganese beds 

 being of rather subordinate value. The Besshi Copper Mine con- 

 tains the best of the pyrite beds in this province, and for tliis- 

 reason it is called the Besshi Province in this i)aper. 



The pyrite beds are chieflj^ found in the so-called crystalline 



1) The description of " Monster " is given in detail in uiy work " Gold," p. 284, Tôkyô,. 

 1910. (Japanese) 



