In 1990, the Bureau of Mines conducted a mineral investigation of the mines and prospects in the east Mojave National Scenic Area (emnsa), San Bernardino County, CA. During field work, the Bureau identified 701 mines and prospects in emnsa for which the geology, mineral resources, and mining history were compiled and summarized. Analytical results for 1,188 rock samples collected are tabulated. Total value of identified resources in emnsa is $7.7 billion. Twenty-four mines and prospects were deemed profitable under current economic conditions. Development could generate considerable economic benefits to San Bernardino County. Potential economic benefits from mining the deposits were evaluated under the following access restrictions for emnsa: (1) full access, (2) h. R. 3460, And (3) s. 11-H.R. 780. Under the full-access scenario, cumulative mine revenues are $3.0 billion, cumulative personal earnings at mines and supporting industries are $0.94 billion, and annual jobs at mines and supporting industries are 2,379. Under h.R. 3460, Mine revenues, personal earnings, and annual jobs are $2.9 billion, $0.88 billion, and 2,165, respectively. Under s. 11-H.R. 780, Mine revenues, personal earnings, and annual jobs are $1.0 billion, $0.32 billion, and 936, respectively.