The Making of America, Volume 6Robert Marion La Follette De Bower, Chapline & Company, 1907 - Inventors |
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Page 66
... range , in Minnesota , was opened in the year 1884. The ore which is here produced is a hard specular , high in iron , and usually of Bessemer grade . This range is the farthest removed from the principal pig iron producing centers ...
... range , in Minnesota , was opened in the year 1884. The ore which is here produced is a hard specular , high in iron , and usually of Bessemer grade . This range is the farthest removed from the principal pig iron producing centers ...
Page 82
... ranges , although the various systems are not thus apportioned . Virtually every mine on any of the four ranges other than the Mesabi is worked on the overhead stoping , the caving , or the milling plan . On the Mesabi range the ore is ...
... ranges , although the various systems are not thus apportioned . Virtually every mine on any of the four ranges other than the Mesabi is worked on the overhead stoping , the caving , or the milling plan . On the Mesabi range the ore is ...
Page 99
... range ores , good results are reached . It might be remarked in passing , that it is in the almost complete ownership of these old range Bessemer ores , essential for mixing , that the United States Steel Corporation comes nearest to ...
... range ores , good results are reached . It might be remarked in passing , that it is in the almost complete ownership of these old range Bessemer ores , essential for mixing , that the United States Steel Corporation comes nearest to ...
Contents
Mineral Resources of the United States | 1 |
Americas Underground Workers | 15 |
Platinum | 16 |
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