Silver City (Chloride Flat) manganese deposits

Region West, Southwest
Mineral systems
Deposit types
Critical minerals
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Revised focus area includes districts in Grant County that have Mn potential, especially Chloride Flat district.
Identified resources Identified resources of iron and manganese. Historical production of manganese.
Production Chloride Flat district produced 1,634,000 long tons Mn at 11 to 16% Mn.
Status Chloride Flat district is centered in Silver City (urban area), reclaimed, and unlikely to produce again in the future. Other districts have Mn occurrences and minor Mn production.
Estimated resources 10 million metric tons reserves (10 to 16% Mn; 30 to 40% Fe). Resource potential for millions of tons more (Richter and others, 1983).
Geologic maps Richter and Lawrence (1983), scale 1:250,000; Richter and others (1986), scale 1:24,000; Lawrence and Richter (1986), scale 1:24,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Carbonate units, typically below an impervious unit (for example, shales). Generally exist to depths of 60 m. Shallow enrichment suggest outlook for discovering more unidentified resources is low (Richter and others, 1983).
Deposits Boston Hill mines (MRDS dep_id: 10014773).
Evidence from mineral occurrences MRDS; McLemore and others (2005).
Geochemical evidence Unknown.
Geophysical evidence No data.
Evidence from other sources McLemore and Austin (2017), McLemore (1997).
Comments Boston Hill area acquired by Town of Silver City and converted into greenspace and trail system.
Cover thickness and description Deposits typically shallow.
Authors Joshua M. Rosera, Virginia T. McLemore.
New data needs This area needs detailed 1:12,000 mapping, chemistry, alteration mapping.
Geologic mapping and modeling needs Detailed and alteration mapping.
Geophysical survey and modeling needs High resolution geophysical coverage needed.
Digital elevation data needs Lidar complete.