170 NEW YORK STATE MUSEUM 



cn a ridge in contact with a gneissoid gabbro. They are of small 

 size and the ore is lean. 



Tunnel mountain, southeast of Elizabethtown and directly east 

 of Little pond, carries a deposit which outcrops on the summit 

 and has been opened to a depth of 40 or 50 feet. The pit runs 

 about north and south and is 10 feet wide. An attempt was made 

 to tap the deposit by a tunnel some 200 feet below the outcrop, 

 but was given up before reaching the ore. An analysis of the ore 

 by Hillebrand gave the following percentages: 



Fe 2 3 20.35 



FeO 28.82 



Si0 2 13.35 



Ti0 2 16.45 



Cr 2 3 .55 



A1 2 3 8.75 



CaO 2.15 



MgO 6.63 



PA 02 



V 2 O s 61 



C0 3 17 



S .09 



c : tr. 



CI tr. 



H 2 0.... 1.68 



99.62 



Iron 35.99 



On the east slope of Tunnel mountain two small pits have been 

 excavated in lean titaniferous ore. 



The Humbug vein, north of Cook shaft, Mineville, is titan- 

 iferous and probably occurs in gabbro, though its associations 

 have not been fully determined. The ore is reported to carry 

 20 per cent TiO. 



