| MadSci Network: Environment & Ecology |
When garbage decays anaerobically (as in any enclosed space) the anaerobic bacterial action produces, among other things, chelating agents like lactate and oxalate, which enhance metal solubility considerably. Therefore, the metal that you are considering would contribute to the contamination around the disposal site. It would actually be better not to line the mines. The contamination from the garbage itself can be controlled more easily.
Try the links in the MadSci Library for more information on Environment & Ecology.