ADIRONDACK MAGNETIC IRON ORES l6l 



which outcrops just south of Big island as indicated on the map. 

 The latter is thus probably an extension of the Sanford, the two 

 being connected by a belt beneath the lake. 



The Sanford deposit is conveniently situated for working, and a 

 quantity of ore that is not subject to careful estimate but which 

 must amount to several millions of tons can be removed by ordinary 

 quarry methods before reaching the level of the adjacent lake. 

 Its position directly in the valley will facilitate transportation 

 when once the district is provided with railroad communication. 

 In quality the ore is above the average of the district. Except 

 for admixture with feldspar it is nearly a pure aggregate of iron 

 minerals. The feldspar is segregated to a great extent along 

 certain bands, though it occurs in smaller amount all through the 

 mass. The separation of the rich ore from the admixed ore and 

 rock could be performed without much difficulty during the quarry 

 operations. 



The Cheney deposit lies about a mile west of Lake Sanford, and 

 has apparently no connection with the Sanford body. It is known 

 to be of large size, though it has been little explored. In one place 

 a pit of some 20 feet deep has been opened. Professor Kemp has 

 described the occurrence as follows : ' ' The wall rock is a gabbro- 

 gneiss as already stated, and the ore contains more sulfur and 

 phosphorus than do the others in the anorthosites. It emits a 

 sulfurous odor when broken with the hammer. In thin sections 

 it is seen to be lean. Apatite is abundant, and brown hornblende, 

 red brown biotite, chloritized augite, and some plagioclase make 

 up a large part of the aggregate." The ore is at times quite rich, 

 but its average is not as high as the Sanford ore. 



About 2 miles north of the Sanford deposit, on its line of strike, 

 there is an exposure of fine grained ore which is mentioned by 

 Emmons as a probable continuation of that deposit. There is said 

 to be a nearly continuous line of magnetic attraction between the 

 two. An opening has been .made well up on the side of Mt Adams. 

 In addition to plagioclase the ore, according to Kemp, contains 

 some spinel. 



In the vicinity of the Tahawus Club and north and west of there 

 towards Lake Henderson, there is a complex of deposits forming an 

 almost connected series distributed over an area of perhaps a 

 square mile. Ore shows on both sides of the river near the outlet 

 of Calamity brook, and on the west side is the Millpond opening 

 from which most of the ore in the early days was taken to supply 

 the furnace. This pit is about 100 feet long and from 10 to 40 feet 

 wide, the walls are like those of the Sanford deposit and the iron 



