United States Geological Survey Research 1978. Mineral Resource and Mineral Fuel Investigation.

摘要

The study of mineral deposits and the geologic factors responsible for their formation is essential if we are to assess national and worldwide supplies and potential for mineral commodities. This continuing effort provided important statements on chromite, fluorite, and alunite resources during 1977. Studies of major U.S. regions produced a deeper understanding of the metal life deposits of the West and called attention to the possibility of important undiscovered metallic mineral deposits in a geologic environment that is widespread in eastern and central United States.