298 



ANNUAL REPOiRT SMITHSONIAN INSTITUTION, 1916. 



1909. Butler-Birkinbine : 



Lake Superior 1, 618 



Southern States 1, 814. 9 



New York 750 



New Jersey 135 



Pennsylvania 45 



Rocky Mountain region 100 



4, 462. 9 



1911. Minnesota-Michigan Tax Commission, J. R. Finlay, engineer : 

 Minnesota and Michigan i 1, 584 



1912. E. C. Eckel : 



Lake Superior 2, 000-2, 500 



Northeastern 300- 600 



Western • 300- 700 



Birmingham 1,500-2,000 



Texas 600-1, 000 



Other Southern States 500-750 



5, 200-7, 550 



The most complete of all the estimates is that of Dr. C. W. Hayes 

 in Bulletin 394 of the United States Geological Survey, 1909. The 

 estimates are divided into two classes of ores; first, those available 

 under present conditions ; and second, those which come within rea- 

 sonable possibilities of utilization for the future. The statistics are 

 given in long tons in millions and decimals of a million. 



In the last group of ores I have included Dr. Hayes's estimates of titaniferous magnetite without sepa- 

 rate classification. 



