estite. The proportion of this mineral which must be imported is 100 percent.
5. Chromium. The proportion of this mineral which must be imported is 79 percent.
6. Cobalt. The proportion of this mineral which must be imported is 85 percent.
7. Columbium. The proportion of this mineral which must be imported is 100 percent.
8. Copper. The United States is the world's second largest producer of this mineral. Importation, thus, is not a significant problem with respect to national defense needs.
9. Fluorspar. The proportion of this mineral which must be imported is 91 percent.
10. Gold. The United States is the world's third largest producer of this mineral. Importation, thus, is not a significant problem with respect to national defense needs.
11. Graphite. The proportion of this mineral which must be imported is 91 percent.
12. Iron. The United States is a major world producer of this mineral. Importation, thus, is not a significant problem with respect to national defense needs.
13. Manganese. The proportion of this mineral which must be imp
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