Iron

The Fe-content of Kish copper-based artifacts is generally quite low (i.e., <0.8%). Most likely its presence is in part a measure of the density of silicate inclusions in the metal, some of those inclusions being remnants of slag picked up during the original smelting of the copper ore.

ED I: 
Range: 0.037%–0.78% (n=13) 
Mean: 0.24% ± 0.05% (1 standard error) 
Highest Fe-level: Bident (inv. V 793/794)

ED III/Akk: 
Range: <0.016%–0.69% (n=43) 
Mean: 0.% ± 0.03% (1 standard error) 
Highest Fe-level: Dagger (inv. FM236 486)