472 



Report of the State Geologist. 



being little <>r no rock covering the ore. The old Clark working is half-wav 

 up the hill, and affords a line example of pinching and swelling of the ore-bed, 

 as shown in a foregoing figure. Considerable ore has been obtained from 

 this mine. 



One mile to the northeast of the Sterling mine, is the Augusta mine, 

 which was of considerable importance in former years. A plan of the 

 ore-body is shown in Plate XLIX. The ore had been mined for a distance 

 of 100 feet on the dip. This mine has been recently opened again. A 

 longitudinal section, or rather side elevation of the section, is given in the 

 lower portion of the same plate, and in Plate L are shown a number of 

 transverse sections drawn along the lettered lines indicated in the upper 

 drawing of the previous plate. It will be seen from these that the ore-body 

 was long and flat. A fine fault is exposed in the hanging Avail at the mouth 

 of the mine (Plate XL). The exact amount of displacement is not known 

 and it does not show in the sections of the ore-body. 



The Causeway and Mountain mines include several small and parallel ore- 

 bodies, which are shown in plan in the upper portion of Plate L. A side 

 elevation of the section of those of the Mountain mine is also shown in the 

 upper right-hand portion of the same plate. It will be seen from this that in 

 each case the ore cropped out at the surface, and that in one instance the 

 bottom of the ore-body had not been reached w hen the mine was shut down. 

 The writer is indebted to Mr. Knox, the superintendent of the Sterling mines, 

 for permission to reproduce these sections and also for other information 

 concerning the mines in this region. 



The Scott mine is a mile and one-half northeast of the Sterling, and was 

 formerly of considerable importance. According to Smock*, it has reached a 

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

 strike, of 900 feet. The ore-bed is four to eighteen feet thick. At the Cooke 

 mine, which is south of the Scott, the shaft has a vertical depth of 250 feet. 

 None of these mines afford bessemer ores. 



The Forest-of-Dean mine is situated five miles west of Fort Montgomery. 

 It has been inactive for a considerable period, but was started up again 

 last August. The mine is owned by the Port Henry Iron Co. and is 

 operated by the Forest-of-Dean Iron Co. The ore-body is large and some- 

 what lenticular, with a thickness of ten to forty feet, and a width of as much 

 as eighty feet in places. A slope is sunk on the pitch which is 22° N. E. and 

 the full width of the vein is stoped out. Pillars are left at intervals to 



3 hoc., cit. 



