GEOLOGY AND ORE DEPOSITS OF SU-AN 31 



Keum-hoa ^\ After crossing a low pass to the west of Heimg- 

 kol, and passing tlie village of Keung-hoa, we come down to the 

 main valley wdiich runs from the south to the north. Precipitous 

 cliffs of limestone are seen, bearing some doubtful traces of gold. 



Song-hydn ~\ To the south of the last-named valley in the 

 environs of Song-hy'ôn, gold washing was formerly carried on, the 

 spot K to the northeast of the village deserving special notice. 

 Here the metamorphic argillite containing lenticular quartz mass, 

 and the overlying and underlying limestones are much fissured ; 

 and the calcareous rocks are stained with ferruginous products, and 

 often decomposed into red earth. The placer gold came no doubt 

 from these rocks. To the north of this auriferous locality, a 

 basaltic dyke and granitic mass are seen intruding through the 

 limestone, thus showing geologically a very close analogy to that 

 of Hol-gol. 



From what has been stated in the foregoing as regards the 

 occurrences of gold outside of Hol-gol, the original home of the 

 melal seems to he in the limestones into which most likely it was 

 carried by intruding granitic magma, though the impregnation is 

 poor and not yet secondarily enriched so as to make it worth 



working. 



^^>) ^^ 



