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Geologic map of the Gabbs magnesite and brucite deposits, Nye County, Nevada
Charles J. Vitaliano, Eugene Callaghan
1956, Miscellaneous Field Studies Map 35
During World War II the magnesite deposits at Gabbs, in northwestern Nye County, Nevada, were the source of ore for the world's largest magnesium metal plant.  This Government-owned plant, located at Henderson, near Las Vegas, Nevada, close to the source of power at Boulder Dam, produced 81,272 tons of metal...
Geologic map of the Tennessee Pass area, Eagle and Lake counties, Colorado
Ogden Tweto
1956, Miscellaneous Field Studies Map 34
The triangular area bounded by the most productive mining districts of central Colorado- Leadville, Climax-Kokomo, and Gilman-Red Cliff- is of economic interest not only because of its close spatial relation to these districts but because it is closely related geologically.  It contains the same rocks as the adjoining mining districts...