1 68 NEW YORK STATE MUSEUM 



garnet, hornblende, feldspar and the other constituents of the 

 gabbro. Analyses by W. F. Hillebrand, quoted from Kemp's 

 article, show the following composition for the ore from both pits. 



North pit South pit 



Fe 2 3 26.30 11. 16 



FeO 29.78 28.35 



Ti0 2 18.82 13.07 



Cr 2 3 75 .37 



V 2 O s 62 .50 



PA tr. .32 



S 06 .10 



76.33 53-87 



Iron 41 . 57 29.87 



PORT LEYDEN MINE 



Near the site of the old iron furnace at Port Ley den, Lewis co., 

 a titaniferous ore body exists in somewhat remarkable associations. 

 It was prospected many years since by a shaft which is said to be 

 65 feet deep but is now filled with water almost to the surface. 

 No ore can be seen in place either at the shaft or in the outcrops 

 nearby, so that it is probably limited to a lens or shootlike mass 

 of no great lateral dimensions. In the volume of the Mineral 

 Resources for 1886, the following mention is made of the occurrence: 

 "A titaniferous ore at Port Leyden (Lewis county) occasioned 

 the erection of a blast furnace, concerning which Mr George D. 

 Colby says : ' With a view of ascertaining the amount and quality 

 of the ore which led to the erection of these works, the present 

 company made borings to a depth of 300 feet. The core of the 

 borings indicated an abundance of ore, but of such chemical com- 

 position that no attempt has been made by this company to produce 

 pig iron from it.' " 



An analysis of the ore, quoted from the same source, shows the 

 percentages below: 



Fe 3 4 52.67 



FeS 2 5.86 



Si0 2 10.95 



Ti0 2 9.31 



A1 2 3 5-2i 



Mn 1 . 1 2 



