Outlines of 1:250,000 scale map quadrangles in Alaska for use as a geographic reference within Google Earth or other software capable of interpreting KML, with links to additional mineral resource-related geoscientific information produced by USGS.

Geological, geophysical, geochemical, or lidar data acquisition projects funded by the Earth Mapping Resource Initiative (Earth MRI) pertaining to the study of critical mineral resources in the US.

Based on detailed information on the location of the Tertiary intrusions and mineral deposits, and on the control provided by the Proterozoic structures, all superimposed using GIS, a new outline of the Colorado Mineral Belt is proposed. Older representations are included for comparison. Data are provided in shapefile format.