32 



CONTENTS 



Introduction 1 



Situation 2 



A. Topographie Features 3 



B. Geology of the District 5 



Slaty mica-schist G 



Chlorite-muscovite-schist 6 



Chlorite-schist 7 



Argilhtc 8 



Contact-metamorphosed h mestones 9 



Porphyritic liornblende-granite 13 



Basalt 15 



Aplite and meta-diorite , 16 



C. Ore-Deposits 18 



The eastern and the western ore-bodies 20 



D. Origin of the Ore-Deposits 22 



E. Analyses of Ores 24 



F. The Working of the Mine 28 



G. Auriferous Localities in the Environs of the Hol-gol Mine... 29 



Sang- dai 29 



Salku-chhi, Kullyang-kol, Neurcum-lvOgai, Sök-tari, Heiing-kol ... 30 



Keum-hoa, Song-hyön 31 



Contents 32 



Plates I.— IV. 



