Il6 • NEW YORK STATE MUSEUM 



tite, feldspar and augite. The feldspar is mostly oligoclase, with 

 subordinate orthoclase. Incomplete analyses quoted by Putnam, 

 No. i from a sample of 300 tons crude ore and No. 2 from 150 tons 

 concentrates, show the following percentages: 



1 2 



Iron 34-8i 65.14 



Titanic acid nil pres. 



Phosphorus .041 .017 



The sulfur was not estimated. The percentage of phosphorus 

 in both crude ore and concentrates is somewhat higher than the 

 average obtained from present operations at Lyon Mountain, yet 

 the concentrates are superior in this respect to most Bessemer 

 ores. Determinations made on 33 samples of drill cores taken 

 from different localities, reported by Mr H. H. Hindshaw, gave an 

 average of 41.87 per cent iron and .025 per cent phosphorus. 



Main group of mines. The ore deposits now under operation 

 at Lyon Mountain comprise the middle section of the belt on the 

 northwestern slopes of the high ridge. The mean elevation of the 

 outcrop is about 2000 feet above sea. level and 300 feet above the 

 floor of the adjoining valley. 



In the southern portion of the group three parallel series of 

 deposits occur and are known locally as the front or main vein, 

 the middle vein and the back or Dickson vein. The main vein 

 which is the one most extensively worked has been proved by 

 actual development to constitute a continuous ore body for a dis- 

 tance of about 2500 feet and its further continuity indicated by 

 test pits and magnetic determinations for an additional 2000 feet. 

 The back vein has been opened only on the southern portion; it 

 outcrops parallel to the main vein at a horizontal distance of 

 about 200 feet. The middle vein between the two is undeveloped 

 and little is known about its extent. A plan of the surface and 

 underground workings is shown in figure 18. 



It is only in the extreme southwestern part of the group that 

 any evidence of a marked structural break is found. For most of 

 the distance the outcrop follows an almost straight line in a gen- 

 eral direction n. 20 e. Near shaft 5, however, a rather sharp fold 

 enters causing the outcrop to swing around to nearly west and this 

 direction is followed for the remaining distance of 1000 feet in 

 which the deposits have been mined. Beyond the Burden open 

 cut which is the most westerly working on the southern wing of 

 the fold the continuation of the ore has not been clearly estab- 



