ADIRONDACK MAGNETIC IRON ORES 97 



12 years ago, put a stop to underground operations and it has not 

 since been reopened. It is said that the ore bodies narrowed 

 appreciably near the bottom, indicating that they are probably 

 lenticular like the Nelson Bush deposits. 



In the reports of Putnam and Smock the mine is described with 

 some detail. Three parallel bodies occur, called the black, the 

 blue and the gray veins. They are separated by gneiss with an 

 interval of 40 feet or less between adjacent walls. The strike is 

 n. 35 e. and the dip 70 at the surface flattening to 55 at 325 

 feet depth. Smock states that the bodies run off as shoots under- 

 ground pitching at an angle of 40 along the strike. The first ore 

 body on the foot-wall side is the gray vein which varies from 3 to 



Fig. 16 Ideal section of the Arnold ore bodies. Blue vein is hematite 



25 feet in thickness. The black vein in the middle is from 3 to 27 

 feet thick and the blue to the west about the same. There are two 

 shafts, 500 feet apart, driven on the dip of the foot-wall vein con- 

 necting by crosscuts with the adjacent veins, and a series of levels 

 about 700 feet long. The section included herewith [fig. 16] shows 

 the relations of the three ore bodies. 



Putnam advances the opinion that the Nelson Bush ore bodies 

 are a continuation of the gray vein, but this can scarcely be true 

 since the axis of the former when produced southward falls con- 

 siderably to the east of the Arnold workings. No indications of 

 a fault sufficient to account for the difference in horizon were 

 found on the surface. It seems more probable that the two mines 

 are located in separate horizons. 



The marked variation in the character of the ore in the different 

 veins is an interesting feature. The black vein yields a granular, 



