This site from the US Geologic Survey contains interactive online spatial data maps of mineral resources for the US, Colorado, Hawaii, Alaska, and the world. Each map provides "geologic, lithologic, geochemical, geophysical, and mineral deposit information in consistent, standard formats." By clicking on one of the map-viewing options, users may select from a list of data sets to be spatially...

From the California Geological Survey, the Online Maps and Data site contains information focused on natural hazards. Topics include minerals, earthquakes, and landslide and erosion hazards. The site also includes the General Location Guide for Ultramafic Rocks in California. The site also has links to a publications page and a new interactive mapping program called the Seismic Hazards Mapping...