The USGS MRP has released a new set of maps compiled from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data that illustrate minerals deposited by hydrothermal alteration that are typically associated with copper, gold, silver, and molybdenum deposits. Some of the minerals mapped are also associated with REE-rich carbonatite deposits. Map coverage of the Basin and Range includes Nevada, southern Arizona, and parts of California, New Mexico, and Utah. The maps help define new deposit targets for mineral assessments and exploration, delineate hydrothermal systems for further deposit formation study, and assist in identifying potential acid-producing and acid-neutralizing rocks in watersheds. The maps and map units can be downloaded from the USGS Web site server (http://pubs.usgs.gov/of/2013/1139/; http://mrdata.usgs.gov/surficial-mineralogy/ofr-2013-1139/).