No. 6.] bOUGLAS — LAKE SUPERIOR COPPER MINES. 



333 



Calumet aud Hecla for year ending Nov. 30, 1873 1 



Quincy, for year ending Nov. 30, 1873 



Franklin Pewabic 



Houghton 



Schoolcraft 



Concord 



Isle Koyale 



Atlantic, for broken season 



Albany and Boston, broken season 



Sumner, for year ending with close of navigation 

 Other sources 



Total 



15,194 1,429 



Production in 1872 12,612 



319 



Increase in 1873, 



2,582 1,110 



Keweenah Point District. 



Central, for year ending Nov. 30, 1873 



Copper Falls, for year ending with close of navi- 

 gation 



Phenix 



Cuff 



Delaware, for year ending Nov. 18, 1873 



Amygdaloid, broken season 



Other sources 



Total 



Product in 1872 



Increase in 1873 



Ontonagon District. 



