* Interdisciplinary field involving processes that
** make use of microbes, usually bacteria and archaea 
** mainly take place in aqueous environment  
** deal with metal production and treatment of metal containing materials and solutions 
*"Biohydrometallurgy may generally referred to as the branch of biotechnology dealing with the study and application of the economic potential of the interactions between microbes and minerals. It concerns, thus, all those engaged, directly or indirectly, in the exploitation of mineral resources and in environmental protection: geologists, economic geologists, mining engineers, metallurgists, hydrometallurgists, chemists and chemical engineers. In addition to these specialists, there are the microbiologists whose work is indispensable in the design, implementation and running of biohydrometallurgical processes."
*Biohydrometallurgy was first used more than 300 years ago to recover copper. The uses have evolved to extracting gold, uranium, and other metals.