ADIRONDACK MAGNETIC IRON ORES 5 1 



often toward the south compass points than toward the north 

 points. 



Most of the deposits proved to be small and were quickly 

 exhausted. The few notable ones which have yielded the greater 

 part of the output for the district include the Penfield, the adjoining 

 West End, the Hammond, Dog Alley, North and No. 7 mines. 



The Penfield mine, with the West End, in the central part of the 

 ore belt may be ranked among the largest in the Adirondacks. 

 It is based on a deposit whose outcrop can be traced for 1000 feet. 

 The line of outcrop forms nearly a right angle. The body is thus 

 divided into a somewhat longer western portion which strikes 

 northeast and an eastern portion with a northwest strike. The 

 latter consists of a simple tabular bed swelling and thinning to 

 some extent and dipping 15 or more to the northeast. The 

 Ayers pit is on the extreme eastern end, across the Hammondville 



Fig. 4 Section across the Penfield pit, western portion. Pegmatite developed 

 along axis of the fold 



road. The central and western portions are more complex in 

 form; their outcrop lies evidently on the apex of an anticlinal 

 from which the ore runs off to the southeast and northwest. The 

 main workings are on the northwest wing of the fold following a 

 dip of 45 , while the ore to the southwest pinches out rapidly on 

 the dip. The foot-wall exposed in the open cut along the axis of 

 the fold consists of coarse pegmatite. The accompanying section 

 [fig. 4] shows the relations in the western portion of the deposit. 



The relations of the West End and Penfield ore bodies are not 

 certain from the little information that can now be obtained regard- 

 ing the workings. The former seems to be an underlying body 

 likewise developed as an anticlinal. Smock describes it in the 

 following words: " The West End is on the normal (southeast) 

 dip of the Penfield ore body, and is remarkable for its irregular 



