GEOLOGY AND ORE DEPOSITS OF SU-AN 29 



The mine is now being worked in part directly by the 

 Government, and in part by the people each of whom pays a 

 royality at rates varying from 3.6 to 5 mommê of gold per month. 

 The number of inhabitants living near the mine is said to be 

 from 300 to 400. Fuel is scanty even in this hilly interior. A 

 small bundle made up of 16-18 sleuder pieces of wood may be 

 had for 10 Korean sen (5 Japanese seQ\ but the price will no 

 doubt increase rapidly as soon as an extensive demand is created. 

 The thin forest of the granitic On-jin-san yields only slender and 

 stunted trees. The wages of a miner vary according to his ability 

 from .70 to 1.30 yen a day. The total number of stamp mills 

 erected on tlie surrounding streams is thirty-six. Each mill 

 consists of ten stamps of 26* kilos. The mills are operated by 

 water power, and gold and silver are directly extracted by the 

 process of amalgamation in the mill. 



G. Auriferous Localities in the Environs 

 of the Hol-gol Mine 



In the neighborhood of the Hol-gol gold mine, there are a 

 number of auriferous localities where gold washing was formerly 

 carried on, but nearly all of tliem have now been abandoned. 



Sang-dai^\ About 12 km southeast of the Hol-gol mine ^\ is 

 the deserted gold mine of Sang-dai, situated at the junction of the 

 limestone with the porphyritic granite of On-jin-san. On a rugged 

 hill at the fork of two streams flowing from the north, there are 

 remains of open works, abandoned more than ten years ago, along 

 the strike (N. 60° W.) of the limestone with the dip to the north- 

 east. The contact limestone is much fissured and crushed, and is 



1) 1 mommê =?,. lb gramme. 



2) Jlffi 3) See PL IV. 



