IliON-ORE RESEEVES.<^ 



By Charles Kenneth Leith. 

 Professor of Geology, Vnlrcrsity of Wisconsin. 



The great increase in the world's annual consumption of iron, 

 together with the attempts of large interests to acquire the known 

 iron-ore reserves, have led to careful inventories of the world's supply 

 of iron ore, its rate of depletion, and to speculations as to further 

 supplies. Estimates of the time of exhaustion of the present known 

 supply have varied widely, but have shown startling agreement in 

 the short time assigned. During the present year there have appeared 

 several discussions of the subject which merit especial attention.'' 



Professor Tornebohm estimates for the Swedish Government the 

 iron-ore reserves of the world by countries, based on detailed figures 

 for the individual districts, as follows : 



" Reprinted by permission from Economic Geology, Vol. I, No. 4, February-March, 1906. 

 Economic Geology Publishing Company, Lancaster, Pa. 



* Presidential address, by R. A. Hadfleld. Delivered at the annual meeting of the Iron 

 vnd Steel Institute at London May 11, 1905. Journ. Iron and Steel Inst., Vol. LXVII, 

 No. 1, 1905, pp. 27-106. 



The iron ore supply of the world, by Prof. Alfred Tornebohm, Teknisk Tidskrift, Sep- 

 tember, 1905. Translated m the Iron Age November 2, 1905, pp. 1158-1160. 



The exhaustion of the world's metals, by N. S. Shaler. International Quarterly, Vol. II, 

 1905, pp. 230-247. 



A world survey of iron and steel, by J. Stephen .Jeans, secretary British Iron and Steel 

 Institute. 



A blue book of iron-ore deposits in foreign countries, by Llewellyn Smith. Compiled at 

 the board of trade from diplomatic and consular reports, London, 1905. 



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