OCCURRENCE OF TIN IN' NOVA SCOTIA.- PIERS. 247 



the lumps inspected. Some of the fluorite occurred in dendritic 

 form. 



A sample of five bags was selected for treatment, whose 

 combined net weight was 1403.94 pounds (637 kilos). The 

 results of the concentration and assays are thus summarized by 

 Professor Sexton, in his report dated' 4th September, 1907: 



(a) The original ore as sampled and assayed contained 

 only a trace of tin. 



(b) 543.2 pounds of product through 4 on 8 mesh were 

 treated on a Collom jig with no resulting concentration what- 

 ever. An assay of the material fed showed a trace of tin. 



(c) 310.8 pounds of product through 8 on 16 mesh were 

 treated' on a Collom jig and only a very thin layer of about 

 |th inch on the first sieve showed signs of being concentrated 

 material. This layer when separated by skimming was found 

 to consist mostly of included grains of quartz and feldspar, 

 with fluorite and tourmaline, and when this product was 

 assayed it was found to contain tin, but in such small quantity 

 that it could not be weighed. 



(d) 257.3 pounds of product through 16 mesh sieve was 

 treated on a half-size Wilfley table, making a small amount of 

 impure heads containing 0.583 per cent, of tin, a very small 

 amount of very impure tailings containing 0.08 per cent, of 

 tin, and about 237.81 pounds (107.9 kilos) of clean tailings 

 containing no tin at all. A calculation of the tin in the whole 

 product fed to the Wilfley table showed it to contain 0.0192 

 per cent., a very small amount indeed. 



Professor Sexton concludes that the percentage of tin pre- 

 sent in the ore supplied to him is so small as to miake the work- 

 ing of such ore as a whole unprofitable ; and he thinks that the 

 cf.siterite must exist in the form of minute flakes and crystals 

 in the ore, and in small quantity. He recommends the locating, 

 by careful inspection and assays, of some ore-shoot which con- 

 tains enough tin to make practical mining profitable, for it will 



