Bacteria (e.g., Thiobacillus ferrooxidans, Thiobacillus thiooxidans, Leptospirillium ferrooxidans & Thiobacillus organoparus) have been used in the process known as microbial mining for several decades, see the following citations:
Joseph Alper; Bioengineers are off to the mines; High Technology; April 1984; pp. 32-35.
Corale L. Brierley; Microbiological mining; Scientific American; Vol. 247; No. 2; August 1, 1982; pp. 44-53.
Chapter 15- Microbes as metal traps; in E. Antebi, D. Fishlock; Biotechnology, Strategies for Life; The MIT Press; 1986; pp. 153-155 & also pp. 227 & 229 for citations.