GEOLOGY AND ORE DEPOSITS OF SU-AN 27 



a sample taken from it shows that it contains 0.0034 gold, 0.0070 

 silver, and 2.94 copper. 



An assay of the earthy ores, occurring on the west side of the 

 western ore-body gave the following results : — 

 Nos. Gold Silver 



4 0.0027 0.0024 



5 0.0001 0.0007 

 10 — 0.0010 



Nos. 4 and o are the yellowish earthy ores at the mill sites 

 of Morai-chhi. No. 10 is from the fault plane. All these ores 

 difler from the calcareous ores, already mentioned, in being derived 

 from the débris of metamorphic schists which fill the fissure of 

 the longitudinal fault. 



Another kind of ore is that occurring in ÛiQporphyritic granite. 

 The analysis made on such ores gave the following results : — 

 Nos. Gold Silver 



7A 0.0006 0.0068 



7B 0.0001 0.0025 



70 trace 0.0014 



46 trace 0.0008 



Nos. 7A, B, and C are taken from the outcrop of pit No. 28, 

 impregnated with iron oxide and quartz. " A " still shows an 

 unaltered portion of the granite-porphyry, " C " a decomposed 

 reddish, earthy variety, and *' B " an intermediate stage between 

 " A " and " C ". No. 46 is a granite-porphyry containing im- 

 pregnated quartz and pyrite picked up at the heading of pit No. 

 32. 



In conclusion, it must be said in the first place that the 

 ore-body is in the Hine-silicale-Jiornfeh, a metamorphosed limestone 



