16 Bulletin of the New York State Museum. 



were kept going and the mine was in order. It is remarkable for 

 the large size of the ore body, the undulating foot- wall, the " rolls," 

 which run north-west and south-east, or at right angles to the dip, 

 and for the fault at the south side, by which the ore is displaced 

 vertically 10 feet. Its slope is 600 feet long. A large amount of 

 ore was taken from the original outcropping bed, on the hillside, 

 and the total output of this mine is a large part of the aggregate 

 raised by the company from all of its mines. From the Sterling 

 levels to the nearest levels in the Lake mine the unopened space is 

 75 feet. 



The Lake mine has reached a vertical depth of 130 feet, and ex- 

 tends under the Sterling lake. The ore body is marked by the same 

 structural features as that of the Sterling mine, and it varies from 4 

 to 20 feet in thickness. The dip averages 15° to north-northeast. 

 The axes of the rolls run nearly in the direction of the dip and the 

 intervals, from roll to roll, are generally a few yards only, or less 

 than in the Sterling. The hoisting slope runs down the foot- wall 

 obliquely to the line of dip, and from it the levels each way penetrate 

 the ore. Pillars are left conveniently where the pinches occur. The 

 walls are of gneissic rock, clean and firm. The ore is rich and 

 medium fine-crystalline. 



The Clarke mine (formerly Tip-Top) on the hill west of the 

 Sterling mine is no longer worked. 



The ore raised in mine cars from the Lake and Sterling levels is 

 dumped at the surface into the company's railway cars and shipped 

 thence, without further handling, to its destination. Over the ridge 

 and about one mile east of the Sterling, in the town of Monroe, are 

 the Cooke and the Scott mines. The latter mine is near the old 

 Oregon, its openings almost connected, and being to the south of the 

 old pits and workings. The Scott "vein" is apparently a few feet 

 above, that is, in the hanging- wall side of the Oregon. There is a 

 third bed in the foot- wall side. The Scott mine has reached a depth 

 of 430 feet on the slope, and its levels have an extreme length on the 

 course of the "vein," of 900 feet. The ore is from 4 to 18 feet 

 thick. The wall rocks are fine-crystalline gneisses. The ore is quite 

 fine-grained and contains in places some hornblende and feldspar, in 

 coarse-crystalline masses. The Cooke mine is south of the last named 

 and in lower ground ; much the same structural features are seen in 

 it as in the Scott mine. The shaft has a vertical depth of 250 feet ; 

 there is more water ; the ore is more crystalline and not as close- 



