I46 NEW YORK STATE MUSEUM 



Part III 



TITANIFEROUS MAGNETITES 



Under this class are included the magnetic ores of the Adirondack^ 

 that carry titanium as an essential ingredient. While the per- 

 centage of this element fluctuates within rather wide limits as shown 

 by analysis of specimens taken from different localities, the mini- 

 mum is always above the proportions encountered in the magnetites 

 previously described. In the general run it amounts to at least 8 

 or 9 per cent (as Ti0 2 ) and will average perhaps 15 per cent in the 

 majority of the deposits. It is due solely to the titanium content 

 that the ores have not been more actively exploited. Except for 

 the early work at Lake Sanford, of which further mention is made 

 on a subsequent page of this report, there has been no active min- 

 ing of the deposits in the region, and till recently little interest 

 has been shown generally in the matter of commercial utilization 

 of titaniferous ores. 



The Adirondack region is a familiar one in the literature relating 

 to these ores. The descriptions of Emmons 1 who was the first to 

 draw attention to the large ore bodies of Lake Sanford, the metal- 

 lurgical experiments of Rossi 2 in connection with the same bodies, 

 and more recently the detailed accounts by Kemp 3 covering prac- 

 tically the entire series of occurrences may be specially noted. 

 The investigation of the geological features of the Adirondack ores 

 has been carried out by Professor Kemp in a manner that leaves 

 little to be added, and his descriptions and conclusions have been 

 closely followed in the present work. 



Distribution of the ores 



The distribution of the titaniferous magnetites is conditioned 

 primarily by the occurrence of the gabbro-anorthosite intrusions. 

 As has been previously noted, the principal „area of these rocks is 



1 Survey of the Second Geological District, 1842. 



2 Titaniferous Ores in the Blast Furnace. Am. Inst. Min. Eng. Trans. 

 1892-93. 21 1832. Also article in the Iron Age, Feb. 6 and 20, 1896. 



3 Preliminary Report on the Geology of Essex County. N. Y. State Mus, 

 49th An. Rep't. v. 2. 1S98. The Geology of Moriah and Westport Town- 

 ships. N. Y. State Mus. Bui. 14. 1895. The paper " Titaniferous Ores of 

 the Adirondacks," published in U. S. Geol. Sur. 19th An. Rep't. pt III, 1899, 

 contains much additional matter relating to the origin and chemical nature 

 of the ores. 



