CADMIUM 



109 



Table 23. — Recoverable identified resources of cadmium in 

 the United States, grouped by major geologic regions and 

 compared with similarly classified zinc resources of these 

 regions 



[See also chapter on "Zinc"] 



Region 



Appalachian 



Mississippi Valley 

 Rocky Mountain _ 

 Pacific Coast 



Total 



^ Average. 



45,000 



'150 



295 



Because of the geochemical similarity of zinc and 

 cadmium, most deposits containing zinc also contain 

 cadmium but in lesser to barely trace amounts. As 

 indicated previously, cadmium is produced solely as 

 a byproduct of zinc extraction and purification. For 

 detail on the types of zinc deposits, their classifica- 

 tion, and the prospecting techniques used in the 

 search for them the reader is referred to the discus- 

 sion of zinc resources in "Zinc," this volume. For 

 additional information on the utilization and ex- 

 ploitation of cadmium, the reader is referred to 

 Heindl (1970). 



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