MINERAL RESOURCES OF THE STATE OF NEW YORK 121 



deposit. It is composed of pink and green felsdpars and quartz 

 with magnetite as the only dark ingredient of importance. The 

 gneiss country is permeated by the granite which is to be seen also 

 in independent bodies. Apparently the deposit has been a locus 

 of igneous activity, a feature that characterizes practically all of 

 the magnetites in Highland region. Several trap dikes occur in 

 the vicinity. The largest is about 6 feet thick and crosses the ore 

 body diagonally, disappearing into the footwall with depth. They 

 have been described by Prof. J. F. Kemp as belonging to the 

 camptonite class of dike rocks. They are much later in age than 

 the granite. 



The Forest of Dean mine is worked by the Fort Montgomery 

 Iron Corporation which a few years ago succeeded the Hudson Iron 



Approximate section of the Forest of Dean magnetite deposit 



