384 MR. J. B. SCRIVENOR OH THE [Aug. I 9°9) 



Until a depth of 120 feet had heen reached in the mine, no tin-ore 

 was discovered in the wall of the deposit. Beyond a slight iron- 

 staining, the crystalline-limestone country presented no remarkable 

 feature, and the division between the ore and the wall was distinct. 

 At 120 feet, however, small veins were found running into the 

 country-rock. One of these veins, not more than an eighth of an 



Pig. 1. — Section of the Lahat ' Pipe,' looking north-north- eastivar ds 

 (depth =300 feet). 



inch thick, was found to contain pyrite, a white mica, yellow tour- 

 maline, cassiterite, and perhaps dolomite and apatite. 



At about the same depth, evidence was found of a slight silicifica- 

 tion of the limestone- wall ; and with the silicified limestone were 

 associated small quantities of tin-ore. A partly silicified specimen 

 yielded *083 per cent, of cassiterite. 



The ore in the pipe, until work was suspended, proved to be of 



