22 Ai; T. 2 — 1!. KOTÙ : 



slope of II siiuill c'i'osiuii-hullow in gruiiitc, aiul to tlio northwest of it 

 rises tlie steep, double-peaked 67/;7ö?z-67/7//(-.s-a/^ '^ (PI. U. Jig. 2) with 

 its ])as(' of niasanito covered lialf way np by the *4reen porphyrite, 

 wliich call l»c seen distinctly from the cuinuài by tlie difference of 

 colors. Tlie top descends abruptly northwards towards Chhil-mm. 

 ^^'.-J'-'*;'^'' hi order to make an inspection of the Ka-ryonn'' copj)er 



mine, 4 km nortli of the eiininäl, we made an ascent northwards to 

 tlie pass (IM. II. ji</. 1) of Kul-Uio-chhi''- (105 ni), the top of 

 which a})i)roximately coincides with the l)Oundary of the masanite 

 and tlie green porphyrite. >'roni the top t saw towards the iiortli 

 the equatorial Mîireioig-.^an '^ I'idge which culminates at Mu-rcung-mn 

 in (*}i]tU-tiüii^\ and consists probably of the same porphyrite and 

 its derivatives. From the pass we followed a stream northwards 

 down t() Ko-haho'i'^ , where a, ti/pica' mamnlic is exposed having 

 a pumiceous aspect on its weathered surface. A ten minute 

 walk to a hill on the east brought us to the copper mine (G hn 

 from the étonnai), then owned b}^ Mr. Maki. The mine'^ is at the 

 western foot of Ka-ri/ong-san (400 in). 



The country-rock is the omnipresent green porphyrite''^ in 

 which five parallel veins of about H or 6 feet in thickness run 

 N. 10'^ E. with a westerly dip. The vein stuff' is a green matrix 

 sprinkled with beautiful, cur^'ed and striped pyritohedrons of 



1) -:A: H: lii ^) -A (TR m \U ^) m ^î i) Ä P^ Hi •') m iä\ «) .-.VI Ëi 



7) Afcordiii^ to Inonyc' {lor. clL), the mine was opened about 20 years ago and worked under 

 the ooutrol of tlie Kiny of Korea. In 1H'J:3 it was transferred to the management of a .Japanese. 

 The mine yielded about 20,000 kin of ore monthly in 1901, and the total outiiut was sent to 

 Osaka, but in 1'.)Ü5 the rich ores were worked out and the mini; was abandoned in the same 

 year. The vein runs N. 10° E., and extends 50-()0 feet along the strike, gradually thinning at 

 both extremities. The ores contain 35,25^jf of copper, but in general yield '20j^J of it. 



8) The rock is green and aphanitic with small porpliyritic plagioclase, clearly seen on 

 weathered surfaces. The siugite is diopsidic with a decomposed i)roduct similar to that of 

 enstatitc. The phenocrystic i)lagioclase has only a few lamellar twins, and the crystal is 

 flattened ou (010). 



