Education Department Bulletin 



Published monthly by the University of the State of New^York 



Entered at the postoffice at Albany, N. Y. as second-class matter 



NO. 423 ALBANY, N. Y. APRIL 1908 



New York State Museum 



John M. Clarke/ Director 

 Museum Bulletin 119 



GEOLOGY OF THE ADIRONDACK MAGNETIC 

 IRON ORES 



DAVID EL NEWLAND 



WITH A REPORT ON THE 



MINEVILLE-PORT HENRY MINE GROUP 



BY 



JAMES F. KEMP 



INTRODUCTION 



The description of the Adirondack magnetites has been pre- 

 pared in partial fulfilment of a plan to give an account of the iron 

 ore deposits throughout the State. Field work was started in the 

 Adirondacks in 1905 and has been carried on, as opportunity 

 offered, during each succeeding season. It is hoped to complete the 

 investigation of the other ore-bearing regions in the near future. 



In the present report Prof. James F. Kemp has contributed the 

 part relating to the important Mineville deposits, a section which he 

 has recently mapped in connection with the geological investiga- 

 tion that is being carried on in the region under direction of the 

 State Geologist. 



The Adirondack region of crystalline rocks affords a variety of 

 iron ores differing in their character and geological surroundings. 

 Those found in sufficient abundance to be exploitable commer- 

 cially may be classified under the main groups — (1) nontitaniferous 



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