/2 NEW YORK STATE MUSEUM 



relations of the ore bodies at and near Mineville, may first be given. 

 There is one group of mines based on a large faulted and folded ore 

 body in the village of Mineville itself. It outcrops at about the 

 1 200 and 1300 foot contours and is the basis of several distinct 

 mines, some of which are no longer worked. A half mile to the 

 northwest, Barton hill rises to an altitude of 1880 feet and on its 

 eastern slope, and ranging from its 1300 contour to the 1750 is a 

 long diagonal outcrop with many pits. The group, collectively 

 taken, is here called the Barton hill. It is possible that this bed 

 swings around to the east under the drift and is the basis of the two 

 Harmony shafts, south of the Mineville groups [see map: fig. 6]. 

 Yet there is still much uncertainty about this connection. 



At the north end of the Barton hill group a gap of concealed and 

 drift-covered fields intervenes with no demonstrated ores. After 

 half a mile, ore again appears in two bands one over the other, at 

 the openings called the Fisher hill and Burt lot, both on the 

 1 600-1 640 contours and now for 10 years or so idle. 



A half mile east of Fisher hill and on the 1450 contour of another 

 hill, is the recently revived Smith mine, whose ore body is tapped 

 still lower down by the O'Neill shaft. Another interval ensues to 

 the north and then after half a mile two old-time but long aban- 

 doned mines are met, called the Hall and the Sherman. The former 

 is one of the oldest in this locality and is mentioned by Professor 

 Emmons. Drilling has recently been in progress in exploring them, 

 but no mining has been done for many years. Still farther north 

 no ores are known for several miles. 



Mineville group. These great ore bodies are the chief source of 

 the local production, and they present a mass of noble proportions. 

 Thanks to the liberal spirit and courtesy of the two companies, and 

 to the excellent and careful records of the engineers they can be so 

 well illustrated that with the solitary exception of the Tilly Foster 

 mine in Putnam county, they give us the best idea of the general 

 shape and relations of a magnetite body, yet afforded in this country. 

 At the latter the structural relations are simpler, and the amount 

 of ore much less. The Mineville group presents a very violent case 

 of folding, accompanied by stretching and pinching of the crest. 

 The ores are in a pitching fold which makes depth rapidly to the 

 southwest, so that we have to keep the relations constantly in mind 

 in terms of solid or three-dimensional geometry. At the north end 

 we have further to deal with a series of faults and a very puzzling 

 relationship, which on the basis of one bed of ore is not easy to 

 satisfactorily clear up. In the present description, the writer's 



