Although all the classical biohydrometallurgical topics - e.g. bioleaching, microbiology, molecular biology, biosorption, bioremediation - are addressed, the continued emphasis is on the environmentally friendly aspects of the biotechnologies used.Given the interdisciplinary nature of the field, biologists, hydrometallurgists, geologists, chemists, physicists and engineers should be interested in this collection of papers which discuss the future trends in biohydrometallurgy..