JOURNAL OF THE COLLEGE OF SCIENCE, IMPEEIAL UNIVERSITY, 

 TÜKYÖ, JAPAN. 

 VOL. XXVII., ARTICLE 12. 



Journeys through Korea 



(Contribution II.) 



The Geology and Ore Deposits of the Hol-gol 

 Gold Mine, Su-an District, Korea ^^ 



By 



B. Koto, -f*/^' D., BigcikiihahusM 

 Professor of Geology, Science College, Imperial University, Tokyo 



With 4 Plates 



The following brief description-- is based upon tlie investiga- 

 tions of Messrs. K. Nakashima ^^ and T. Iki "*'. I myself have not 



1) When this paper was on the point of beins; sent to the printer, I received from 

 Herr Oberbergrat Professor Dr. E. Beck a copy by friendly gift of his well-known standard 

 work, " Lehre von den Erzlagerstätten ", Dritte Auflage. On hastily running over the pages 

 on the contact-metamorphic ore- deposits, I found on p. 165 brief notes of a written com- 

 munication from Herr Bergingenieur L. Bauer on the same gold deposit on which the 

 present paj)er is intended to make a short contribution. With the statements made there I 

 generally agree; but I am unfortunate in not being able to find in the specimens at my disposal 

 a sure trace of tremolite in coarse marble. However, I found ilvaite or liëvrite in large 

 quantities. 



2) This paper was nearly ready in March, 1907, and was originally intended to be 

 embodied in my series of papers entitled "Journeys through Korea", the first number of 

 which has just appeared in this Journal, Vol. XXVI., Art. 2, 1909. As further contributions, 

 toucliing north Korea, must long remain unfinislied, and as meanwhile the state of things in 

 the peninsula is speedily changing, it seems better to let the present short paper appear 

 independently ; otherwise my account would soon be out of date. 



3) " The Ore-deposit of the Hol-gol Mine in Sii-an, Hoang-hai-Do, Korea." 1905. (MS.) 

 Dr. K. iSTAKASHniA, an expert of the Mitsui Mining Co., of this city, allowed me the free use 

 in the present paper of numerical data from his manuscript, for which I return my warmest 

 thanks. 



4) "Eeport on tlie Mineral Eosources of Korea. Tlie Hoang-hai-Kyömj-sang-Do Divi- 

 sion" (in Japanese). Mining Bureau, Tokyo, 1906. 



