The Bureau of Mines has initiated a program to determine the availability of land for mineral exploration and development in Alaska. Researchers involved in this program are comparing land availability, based on ownership and government policies and regulations., To the distribution of known mineral deposits and terrances. This report on southeastern Alaska presents the findings of the first of six regional studies that will cover the state. The study consisted largely of data compilation and analysis using various mapping techniques. Summary land availability data are presented on copies of U.S. Geological Survey quadrangles at a scale of 1:5000,000. Five categories of land availability were identified: open to mineral exploration and development (approximately 9.4 million acres, or 38% of the 24.8-million-acre study area), open but with possible use restrictions (4.2 million acres, or 17%), selected (0.5 million acres, or 2%), patented exploration and development (10 million acres, or 40%). Of the 1,187 known mineral deposits in the study area, approximately 38% are on land in the open category. Mineral terranes comprise approximately 6.7 million acreas, or 27% of southerastern Alaska. Approximately 34% of these terranes are on open land.