502 



Scientific Proceedings, Royal Dublin Society. 



spectively lOf and 6*9 ozs. per ton. The following is the analysis 

 of the argentiferous galenetic blende, so-called "Bluestone," as 

 found at the Connary mine, E. Wioklow. 



Silver,^ 



Zinc, 



Lead, 



Iron, 



Manganese, . 



Antimony, 



Arsenic, 



Copper, 



Aluminum, . 



Magnesium, with traces 



Sulphur, 



Silica, &c.. 



of Calcium 



trace 



0-024 



25-27 



25-18 



6-61 



0-21 

 0-08 

 2-60 

 0-60 

 0-02 

 23-71 

 16-896 



100-000 



This mineral may therefore be said to consist of 



Sulphide of Zinc, 

 Sulphide of Lead, 

 Sulphide of Silver, 



37-68 per cent. 

 29-07 

 00-275 ,, 



and contains variable quantities of pyrites, which in this particular 

 specimen amounts to 10 per cent. 



The sulphide would represent nearly 22 per cent, of the sulphur 

 found. 



It was examined for the rarer metals by the spectroscope, but 

 no indication of those elements could be got. 



Grold was present in very small quantities. It was not estimated. 



Mr. A. Byder, of the Ovoca Mining Company, has kindly given 

 me the following information upon the subject of the lie of the 

 ore : — " The bluestone commences immediately to the east of a 

 fault. It is here very rich in sulphur, and consequently of little 

 value. We have driven on it for about 120 fathoms east, and have 

 found that it increases in size [i. e. thickness of lode) and value as 

 we go east. It also increases in value as we go deeper. It is the 

 most 'bunchy' ore I know, growing in one place from 4 inches 

 thick up to 3 feet 6 inches. In a distance of four fathoms I 



Equal to 8-6 ounces per ton (nearly 8 ounces troy). 



