OTHER RESOURCE,'? OF MICHIGAN 91 



or where it has not reached the copper district, or 

 has not uncovered remunerative quantities of it. 

 While there are areas in which mining operations 

 have long since ceased and the land has returned 

 to its wild neglected status, there are other areas 

 in which for the first time mineral exploitation is 

 being carried forward. Copper mining in Michigan 

 suffered from the recession of business following the 

 conclusion of the World War, but the return of 

 normal relations throughout the commercial world 

 is expected to reestal)lish the industry on a reason- 

 ably satisfactory basis. 



A by-product of the copper industry is of par- 

 ticular importance to Michigan agriculture. Arsenite 

 of lime is recovered from tbe smelters and is service- 

 able as a grasshopper and general poison. It was of 

 advantage in the grasshopper "epidemic" of 1920 

 CO have an abundant supply of this sidjstance readily 

 available, and it was freely utilized. 



With the exception of Brazil, the Lake Superior 

 region has the largest deposits of iron ore known 

 to exist in the world. These occur in Michigan, 

 Wisconsin, Minnesota and in Canada. The deposits 

 in Michigan are found in three ranges: The Mar- 

 quette, the Menominee and the Gogebic. The ex- 

 ploitation of the Lake Superior iron ores followed 

 the discovery of this mineral on the Marquette Range, 

 as already stated, in 1844. The following year a 

 company organized at Jackson carried on explora- 

 tions in the same district and located the famous 

 "iron mountnin" near Teal T>ake, lictwecn the pres- 



