Mineral assessment tracts in Black Hawk county, Iowa

LS01: Duluth Cu-Ni-PGE (5a) (Middle Proterozoic) , covers 52 % of this area
The number of undiscovered deposits in this tract was not estimated.
LS07: Sediment-hosted Cu, reduced-facies (modified) (30b.1) (Middle Proterozoic) , covers 48 % of this area
90%50%10%5%1%
25101010
LS09: Mississippi Valley, S.E. Missouri Pb-Zn (32a) (Late Paleozoic) , covers 100 % of this area
90%50%10%5%1%
00012