ADIRONDACK MAGNETIC IRON ORES 1 59 



iron. They are also coarser grained as a rule than the ores in the 

 gabbro. 



The deposits outcrop on both sides of the narrow valley occupied 

 by Lakes Sanford and Henderson and their outlet which is one of 

 the head-streams of the Hudson river. The valley bottom lies at 

 an elevation of from 1700 to 1800 feet. The situation of the more 

 important ore bodies is shown on the map reproduced from a 

 section of the Santanoni quadrangle [pi. 15]. The outlines of the 

 bodies as sketched are to be considered as approximations only, 

 since they have not been fully proved. It will be observed that 

 the deposits are grouped along a north-south belt about 2 miles 

 wide and 4 or 5 miles long. 



On the south end are the Sanford and Cheney ore bodies situated 

 on the east and west sides respectively of Lake Sanford. The 

 Sanford is perhaps the most important of the whole group. It 

 lies between the crest of Sanford hill and the lake shore, occupying 

 in its widest part the entire interval of about \ mile and running 

 north and south for fully twice the distance. Outcrops are found 

 on the west shoulder of the hill, at a point about 300 feet above 

 the lake level where a small quantity of ore has been removed, 

 and at many points directly south. For the most part the out- 

 crop is concealed, however, by a light covering of soil and glacial 

 materials. The Sanford deposit was prospected with considerable 

 care by Professor Emmons who has left a circumstantial and 

 faithful record of the results. 1 Five lines of excavation were made 

 under his direction, four running transverse and one parallel to 

 the length of the body. The middle transverse section began at 

 the base of the hill and ran eastward at right angles to the course of 

 the ore, a distance of 514 feet. Its exact location is not now ascer- 

 tainable though probably it was about on a line with the opening 

 mentioned above. The record of this section which is given in 

 greatest detail affords a good idea as to the general character of 

 the ore body and is here quoted. 



Record of the middle transverse section of the Sanford ore body made 

 by Professor Emmons 



Pit Interval 



•.no. feet 



i . . Fine granular feldspar, intermixed with iron, garnet 



and hornblende 

 1 2 36 Rich ore breaking into tabular masses 



1 Survey of the Second Geological District. 1842. p. 249. 



