506 



THE ORE-DEPOSITS OF BOHAH CREEK, 



of the ore. The silver-values for average ore are higher than ia 

 the King Conrad Lode. Tlie silver is probably associated with 

 galena, (possibly as sulphide of silver) but assays show that, of 

 the metalliferous minerals, arsenopyrite and sphalerite also con- 

 train appreciable quantities. It was also noticed that, where the 

 galena is associated with sericite, the silvei-- values are higher; 

 and it is possible that the sericite itself contains silver. 



Text-fig.5 is a section of the lode, which is symmetrically 

 banded, and shows the same order of deposition as was noted in 

 the King Conrad Lode. This lode, too, is rather wider than the 



Scs/e 



z Feef 



Text-fig. 5. — Illustrating the banding of the Conrad 

 Lode. 



a, granite — s, soft band of kaolinised rock, the 

 "dig" — h, arsenopyrite — c, sphalerite and chalcopy- 

 rite merging into sj)lmlerite and galena — d, comb- 

 quartz. 



King Conrad, its average width being about 2 feet. This section 

 differs from that of the King Conrad Lode chiefly in the exist- 

 ence of a pronounced " dig," which has been described. The 

 outer bands are of arsenopyrite, and these are followed by 

 admixed sphalerite and chalcopyrite, which pass over into a zone 

 of mixed sphalerite and ax-gen tiferous galena. The central 

 portion of the vein is filled with quartz exhibiting well marked 

 comb-structure. It was diflicult to select a specimen of suffi- 

 ciently large size to illustrate the nature of the banding, but 

 Plate xvi., gives a fair representation of portion of the lode. It 



