Pb-free cracker dust has been installed on top of Pb-rich topsoil in Broken Hill.
We investigated the efficacy of cracker dust in suppressing topsoil Pb.
High Pb concentrations are found in natural soils near the Broken Hill orebody.
Low Pb concentrations are found in most cracker dusted topsoils near the orebody.
Pb-rich dust deposition has only a slight effect on the efficacy of cracker dust.