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Geologic map of Lake Valley manganese district, Sierra County, New Mexico

January 1, 1994

The Lake Valley district was originally developed as a manganese-silver district, but the known silver-bearing ore bodies have long since been worked out.  The critical shortage of manganese during World War II renewed interest in the manganese deposits; from October 1941 through June 1942 the U. S. Geological Survey and the U.S. Bureau of Mines conducted a cooperative exploration program in the district.  This exploration demonstrated that the Lake Valley district contained about 175,000 tons of ore; approximately 37,000 tons has subsequently been mined.  The present reserves are estimated to be approximately 140,000 tones of ore with a manganese content of more than 10 percent and an average content of 16.4 percent; about 75,000 tons of the ore has manganese content of more than 15 percent and an average content of 20.7 percent.

Citation Information

Publication Year 1953
Title Geologic map of Lake Valley manganese district, Sierra County, New Mexico
DOI 10.3133/mf9
Authors S. C. Creasey, A.E. Granger
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Miscellaneous Field Studies Map
Series Number 9
Index ID mf9
Record Source USGS Publications Warehouse