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### The copper deposits of Michigan

#### Professional Paper 144

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- Document: **Document**                                
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- **Plate 2**                                 
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- **Plate 52**                                 
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- Download citation as:  RIS

#### Abstract

The copper district of Keweenaw Point, in the northern peninsula of Michigan, 
is the second largest producer of copper in the world.  The output of the 
district since 1845 has been more than 7,500,000,000 pounds and showed a rather 
steady and consistent increase from the beginning of production to the end of 
the World War in 1918, since which there has been a marked 
decrease.

#### Study Area



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U.S. 
Department of the Interior |                 U.S. Geological Survey                URL: 
http://pubs.er.usgs.gov/publication/pp144 
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