Copper-Tin Veins of the Akénobé District. 3 



This district was thoroughly studied and mapped about thirty- 

 years ago by T. Kochibei), whose report on its geology and oro 

 deposits is of high vahie even at present, bat many new data and 

 facts since brought to light by progressive mining explorations 

 necessitate a more detailed study, w^hich lead to conclusions some- 

 what different from those reached by the above mentioned author. 



Before proceeding further, I must here fulfill the pleasant duty 

 of acknowledging my deep indebtedness to the munificence of Toku- 

 jiro Fujita Esq. of Osaka, whose liberal offer of all the necessary 

 expenses has enabled me to publish this paper in its present form. 



II. Topography. 



The Akénobé mining district forms a part of the mountainous 

 region of Eastern Chugoku, consisting of precipitous peaks and ranges 

 of about 1000 meters (Fig. 2). The western and central parts of 

 Chugoku are very remarkable in their physiographic features, inas- 

 much as they form an elevated peneplain sculptured deeply by re- 

 juvenated rivers (Fig. 3).2)3J But in the district now in question, 

 the t(ipography is somewhat different. It is in ripe maturity. 

 Peaks are generally more precipitous an^l higher in this district 

 than in the western and central parts of Cliûgoku. The prominent 

 peaks in the area under consideration are Suruga-miné (1053 m.), 

 Takaiwa-miné (1054 m.), Shiroiwaminé (930 m.) on the eastern 

 side of the Akénobé valley; Sora-yama (977 m.) and Ryöken-zan 

 (786 ra.) on the south; and Sajimi-yama (900 m.) and others on 

 the west. On observing the general topography from the summit 



1) T. Kochibe. " (reology ami ore deposits of the Ikuno mine," 1890 fin Jaj-winese). 



2) B. Koto, " The physiographic type of Chugoku," Report, Earthq« Invest. Committee, 

 No. 63, pp. 1-1.5. 



3) T. Katô, "The ore deposits in the environs of Hanano-yama, near tlie town of Oda, 

 Trov. Nagato, Japan," Journ. Meiji Coll. Techn., Vol. I., No. 1, 1916. 



