Skip to main content
U.S. flag

An official website of the United States government

Floyd Gray

Floyd Gray is a Scientist Emeritus with the USGS Geology, Minerals, Energy, and Geophysics Science Center in Tucson, AZ. Floyd's work with the USGS has included regional geologic studies, metallogenic studies, mineral-resource assessments, and mineral-environmental studies. 

As a mineral resource specialist in the MRP, he studies the genesis and geologic setting of early magmatic and hydrothermal ore deposits and conducts assessments for undiscovered mineral resources in the Southwestern US, northern Mexico, Central America and the Caribbean basin. He is the project chief of the USGS Puerto Rico, U.S. Virgin Islands and Adjacent Areas of the Greater Antilles Quantitative Mineral Resource Assessment project. His recent research efforts have been in the area of flood hazard early warning systems, hydrogeologic framework studies, aqueous and environmental geochemistry, soil geochemistry, and limnology focusing on mineral-related environmental/ecological vulnerabilities resulting from dispersal of metal contaminants from abandoned and newly developing mine lands. Part of the long-term focus has been to understand the physical and biogeochemical processes that control the distribution, transport, and fate of trace elements in aquatic systems.