BY LEO A. COTTON. 



'79 



is another open cut, from jN" to O(text-fig.lO). This is the largest 

 excavation, and presents an interesting feature, in that there is 

 here a considerable development of copper-carbonates. A parcel 

 of rich tin-ore was obtained from C(text-fig.ll). This occurred 

 in a soft, iron-impregnated, sandy material lying close to a 

 slickensided wall, which separated the lode from a soft and 



Sea It 



8 Feet 



^Fig. 11. — Section across Leviathan Lode. A and F, decomposed granite; 

 B, slickensided wall of lode; C, Soft ironstone-band with cassiterite; D, 

 Hard ironstone-band with less cassiterite; E, Dark siliceous rock, constituting 

 lode; G, Lode of quartzose-type; H, Silicified granite, showing platy 

 structure. 



decomposed granite. G represents a lode similar to the quartzose 

 type at Elsmore. H is a belt of silicified granite, in platy layers 

 dipping to the south-west. 



The occurrence of copper-ores at this mine is of interest and 

 importance, in view of the fact that many of the lodes of Corn- 

 wall were originally worked for copper, and only made into tin 

 at a depth. 



Chapter iv.— Conclusion. 



The foregoing is a description of the general geology of a por- 

 tion of New England, with special reference to the tin-ore deposits 

 of that district. The area represented on the accompanying map, 

 lies within the rectangular block, at whose corners are situated 

 the towns of Inverell, Bundarra, Glen Innes, and Guyra. It is 

 mainly in the western portion of this block that the tin-deposits 

 occur. 



