750 



GEOLOGY AND TOPOGRAPHY OF THE LEAD REGION. 



The amounts smelted by Richards & Co., at their furnace in Warren, Illinois, are ap- 

 pro>dmately as follows : 



Year. 

 1873. 



1874. 



Pounds. 

 450,000 

 300,000 



Year. Pounds. 



1875 250,000 



1876, to October 1st. . . . 200,000 



Inasmuch as no detailed statements could be obtained from any of these parties, or 

 anything more than the foregoing approximations, it is impossible to give a correct and 

 reliable account of the several amounts they have smelted since 1862. By comparing 

 their present product with that of other parties in former years, it is estimated that 

 they have smelted, since January 1, 1862, about one hundred million pounds. 



As it is a matter of interest to compare the present production of the mines with tlio 

 past, I have taken the liberty to reproduce the following statistics of the Upper Missis- 

 sippi Lead mines, the product being given in tons of metallic lead. 1 



I am also indebted to Messrs. N. Corwith & Co., of Galena, for the following con- 

 densed statement of the production of the Upper Mississippi Lead mines: 



Years. Pigs. 9 Tons. 



1821 to 1831 664,118 23,244 



1831 to 1841 1,591,950 55,718 



1841 to 1851 6,170,857 215,979 



1851 to 1861 4,609,553 161,334 



1861 to 1871 2,419,985 84,700 



1872 200,000 7,000 



1873 200,000 7,000 



1874 150,000 5,400 



1875 150,000 5,400 



To Oct. 1876 125,000 4,500 



1 See Whitney's Metallic Wealth of the United States, 1854, p. 421. 



2 The weight of a pig of lead is about 72 pounds. 



