48 



NEW YORK STATE MUSEUM 



^y/e, while if the whole hed is taken out without sorting, the aver- 

 age will be about 4ofo. The fossil ore in the western part of the 

 State runs from 35 or 36^ to 44 or 45;^. 



The following analysis quoted from a paper by A. H. Chester- 

 is of interest, as it represents the average from a large number of 

 analyses of Clinton ores from Oneida county. 



Fe... 



SiO^. 



AI263 



MnO 



CaO. 



MgO. 



S.... 



CO2 



H.6.... 



O in Fe and P 



. 44 



•4 



13 



09 



5 



99 





.19 



5 



85 



2 



69 





31 





53 



6 



08 



I. 



45 



19 



71 



100.29 



The percentages would indicate that the ores analyzed were chiefly 

 from the oolitic bed, though no mention of localities is made in the 

 paper. 



Phosphorus and sulfur are both comparatively high in the 

 Clinton ores. The former is seldom less than .25^ and ranges up to 

 more than ifc. Reckoned on the basis of metallic iron, the phos- 

 phorus content will average from i to 2^. The sulfur is morC; 

 variable, being found in some ores only in traces and in other* 

 running up to .5;^. It occurs always in the form of pyrite whicl 

 seems to be associated rather with the shale partings than in-l 

 termixed with the hematite. Between the ore and wall rock therei 

 is oftentimes a thin seam of pyrite. 



Among the other important impurities of the ores are silica,] 

 alumina, lime and magnesia. Most of the silica is in the free state 

 as quartz. Its proportion varies from a minimum of 2 or 3^ up 

 to 15^, the higher percentages being shown by oolitic ores. 

 In the fossiliferous hematites the average may be placed at about] 

 7 or S^/>. The alumina is combined with a part of the silica to 



* Address delivered before the Utica Mercantile Manufacturing Association, Utica, 1881.J 



