USEFUL METAL- 



121 



FIG. 79. Map showing location of Coeur d' Alene, Idaho district. 

 After Ransome. (By permission of the Macmillan Company, from Ries' 

 Economic Geology.) 



Areai in which occur Am< in which occur Ana in which Principal aurif*rou Productive mm..-* PTUMKXU ur nuiwi 

 laad-nlver drootiu of lead-ulvrr dt po.ni of occur coinr 4rM , not ..r imnurjr 



known pnmary ondar> impurunw aVtniU imporuncv- 



imporuncf to far a< at pnttcnt 



known 



FIG. 80. Geologic map of Coeur d' Alene, Idaho district. (After 

 Ransome. (By permission of the Macmillan Company, from Ries' Economic 

 Geology.) 



