28 Allï. 11'. — B. KOTÔ : 



at its contact with the intrusive granite : and secondly, that it 

 does not extend at the surface in a linear direction sufficient to 

 make it appear worth mining. Leaving out of consideration the 

 auriferous porphyritic granite too poor for mining under present 

 conditions, the area of the known ore-bearing portion may be 

 estimated as 6.6, square kilometers (2,000 tsubo) in all ; but from 

 the nature of the deposit, it must be taken as an admitted fact 

 that the workable and barren portions of the contact-metamor- 

 phosed limestone are so intermixed throughout the entire area 

 that it is a very difficult task to estimate fairly the average value 

 of the auriferous contents. As a matter of necessitv a great deal 

 of the mined limestone will have to be thrown out in the actual 

 working, as being either totally devoid of gold or at least yielding 

 too little to pay for working. The dejected ore and rubbish, ac- 

 cording to Mr. Nakashima, may be as much as 60^^. 



F. The Working of the Mine 



The mine seems to have been worked a hundred years or so 

 ago, but no exact record was kept. It was re-opened in 1896, and 

 a portion of it was operated for four years under the hand of a 

 Japanese — Tahei Yamaguchi — who set up wooden stamping mills 

 of the type now in use in Kagoshima, Japan. In 1900, Yama- 

 guchi sold all the rights he then held to the Korean Household 

 Department under whose control the mine was in operation up 

 1907 when it was just passing into the hands of an American, 

 named Collbran. In 1905, however, a syndicate, representing 

 Japan, England, and the United States, was formed, but was soon 

 dissolved owing to the unfavorable reports of the engineers who 

 were sent to investigate the workable capacity of the mine. 



