144 



NEW YORK STATE MUSEUM 



lake, known as Little pond. An old road passes it and out through 

 the valley of Kerner brook and is reputed to be the one made by the 

 first settlers in entering what is now Pleasant valley. A little to 

 the northeast of the pond and in two hillocks of gabbro, openings 

 have been made upon bodies of titaniferous ore of considerable 

 size. A great area of dark basic gabbro is present in these hills, 

 and the openings have been, excavated in masses of ore occurring 

 in it. The north pit is 20 by 20 feet and 15 feet deep. The south 

 pit, 200-300 yards southeast, is run in a hillside and is 30 by 30 

 feet. The working face is 25 feet high. The ore contains the same 

 green isotropic substance described from Split Rock. Great ex- 

 pectations were raised by these ore bodies when first discovered ; 

 thus W. C. Watson in his History of Essex County, states that 

 the ore forms an entire hill and is inexhaustible in amount.^ 



The wall rock of the pits is the usual green gabbro of this region. 

 The ore is found on microscopic examination to contain, besides 

 the ilmenite and magnetite, brown hornblende, olivine, garnet, 

 and plagioclase. The following partial analyses by W. F. Hilde- 

 brand indicate the composition. When recast we obtain the 

 third and fourth columns. 



Ti02 



FeO 



Fe.O. 



CraO, 



V2O. 



S. . . 



Total 



Fe 

 Sp. 



Gr. 



North 



So th 



pit 



pit 



18.82 



13.07 



29.78 



28.35 



26.30 



II .16 



•75 



■37 



.62 



•50 



tr. 



•32 



.06 



.10 



7^-33 



53 •87 



41 57 



29.87 



4.41 



3^83 



Ilmenite • 

 Magnetite 

 Chromite 

 Pvrrhotite 



North 

 pit 



South 

 pit 



35^27 



24.40 



38.05 

 .64 

 .18 



16.24 



•45 

 .26 



Pit near Lincoln pond. Lincoln pond is the source of the Black 

 river, and was earlier referred to, in speaking of the Tunnel moun- 

 tain pits. A quarter of a mile west of it in a steep cliff of gabbro, 

 an open cut has been run in on a mass of ore. The opening is 

 locally known as the Kent mine, and it is the largest of all the 

 openings in Elizabethtown. It is 15 feet wide by 75 to 100 feet 

 long, and is continued by a shaft to an unknown depth, as it was 

 full of water when visited. The wall rock is quite massive, and 

 varies in composition from a true norite to a gabbro. Green augite, 



1 N. Y. State Agric. Soc. Trans. 1852; 12:649. 



