COPPER. 143 



I 



2.04.16. Some important mining for copper has been done on 

 Isle Royale, along the Canadian shore, and in Minnesota, but al- 

 though Keweenawan rocks are in great force, no large amount of 

 the metal has been found. 1 



2.04.17. Example 19. St. Genevieve, Mo. Beds of chalco- 

 pyrite associated with chert in magnesian limestone of the Lower 

 Silurian system. St. Genevieve is situated on the Mississippi, about 

 forty miles south of St. Louis. The Second Magnesian Limestone 

 of the Lower Silurian outcrops, with the Carboniferous on the 

 north, and more or less Quaternary in the vicinity. There are two 

 nearly horizontal beds of ore, of widths varying between three 



1 It would be impossible and undesirable to give in this place com- 

 plete references to the literature. Such bibliography will be found in Irv- 

 ing's monograph, and in Wadsworth's. The more important papers are 

 given below, with some additions to the lists mentioned above. 

 Blake, W. P., "Mass Copper of the Lake Superior Mines," etc., M. E., 



IV. 110. 

 Credner, H., On the geology, etc., Neues Jahrbuch, 1869, p. 1. 



Engineering and Mining Journal, "History of Copper Mining in the 



Lake Superior District," March 18, 1882, p. 141. 



Foster and Whitney, Report on the Lake Superior Copper Lands, 1850. 

 Hall, C. W., "A Brief History of Copper Mining in Minnesota," Bull. 



Minn. Acad. Nat. ScL, Vol. III., No. 1, p. 105. 

 Irving, R. D., " The Copper-bearing Rocks of Lake Superior," Monograph 



V., U. S. Geol. Survey, especially p. 419. Rec. 

 Jackson, C. T., "The Great Copper-bearing Belt of Canada," Boston Soc. 



Nat. Hist., IX. 202. 

 Lawson, A. C., "Note on the Occurrence of Native Copper in the Animi- 



kie Rocks of Thunder Bay," Amer. Geol., V. 174, 

 Poole, H., " Michipicoten Island and its Copper Mines," Engineering and 



Mining Journal, Aug. 6, 1892, p. 125 ; Sept. 3, p. 220. 

 Pumpelly, R., Geol. Survey of Mich., 1873, Vol. I. 



" On the Origin of the Copper," Amer. Jour. Sci., U., III. 183-195, 243- 



253, 347-353. Rec. A later and fuller paper is in Proc. Amer. 



Acad., 1878, Vol. XIII., p. 233. 

 Wadsworth, M. E., Notes on the Geology of the Iron and Copper Districts 



of Lake Superior. Cambridge, 1880. 

 Whitney, J. D., " On the Black Oxide of Copper of_Lake Superior," Proc. 



Boston Soc. Nat. Hist., January, 1849, p. 102; Amer. Jour. Sci., ii.,, 



VIII. 273. 



Metallic Wealth in the United States, p. 245. Rec. 

 Whittlesey, C., "On Electrical Deposition," A. A. A. S., XXIV. 60. 

 Wright, C. E., and Lawson, C. D., Mineral Statistics of Michigan. An- 

 nual. 



