332 



PROCEEDINGS OP THE GEOLOGICAL SOCIETY. 



[June 9, 



whatever ; but it was found to be quite poor, nearly barren, under- 

 neath the granite, though pretty rich above it, and the " horse " 

 dividing the reef gradually widened again in depth, whilst for a 

 good height above, towards the second granite-vein, it had been 

 nearly absent (fig. 6). 



The fourth granite vein that traverses the reef is from 5 to 8 inches 

 thick, and dips E. at an angle of about 20° with a slight northerly in- 



Fig. 6. — Cross section of the 

 Reef, showing third vein 

 of Granite and " Horse. ''^ 





Fig. 7. — Cross Section, showing fourth Gra- 

 nite-vein cutting off the Reef (eastern and 

 western veins ivith '^Horse^^ between) and 

 probable position of lost portion, also gra- 

 nite bottom fioor and felspathic vein. 



clination. It was struck in the engine-shaft at a depth of 430 feet, 

 where the reef, as a whole, has a width of nearly 50 feet, of which 

 the western vein represents about 20 feet, the " horse " about 

 25 feet, and the eastern vein 4-5 feet. Beneath the granite all 

 traces of the reef are absent, and only the hard blue metamor- 

 phic sandstone of the district occupies the place. The company 

 deepened their shaft through this rock to a depth of 490 feet, when 



