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  3. Earth MRI focus areas

Metamorphic

Metamorphic systems recrystallize rocks containing organic carbon or REE phosphate minerals.
Color on map:

Deposit types

Name Commodities Critical minerals
Graphite (coal or carbonaceous sed) Graphite (amorphous and flake) Graphite (amorphous and flake)
Magnesite Mg Mg
Gneiss REE (monazite, xenotime) Th, U, REE, Y REE, U
Gneiss uranium U U

References

Source: Hofstra, A.H., and Kreiner, D.C., 2020, Systems-Deposits-Commodities-Critical Minerals Table for the Earth Mapping Resources Initiative: U.S. Geological Survey Open-File Report 2020-1042, 24 p., https://doi.org/10.3133/ofr20201042.

List of Earth MRI focus areas with mineral system = Metamorphic

26 focus areas match these criteria.

Focus area Region States Mineral Systems Deposit types Commodities
Chugach Range Graphite Alaska Alaska Metamorphic Graphite (coal or carbonaceous sed) (none)
Seward Peninsula Graphite Alaska Alaska Metamorphic Graphite (coal or carbonaceous sed) (none)
Yukon-Tanana Upland Graphite Alaska Alaska Metamorphic Graphite (coal or carbonaceous sed) (none)
Graphite in black shales North Central Michigan; Minnesota; Wisconsin Metamorphic Graphite (coal or carbonaceous sed) (none)
Brimfield Schist graphite Northeast Connecticut; Massachusetts Metamorphic Graphite (coal or carbonaceous sed) (none)
Cockeysville Marble Northeast Maryland Metamorphic Graphite (coal or carbonaceous sed) (none)
Glens Falls Graphite Areas Northeast New York; Vermont Metamorphic Graphite (coal or carbonaceous sed) (none)
Graphitic Gneiss Northeast Maryland Metamorphic Graphite (coal or carbonaceous sed) (none)
Madrid Formation graphite Northeast Maine Metamorphic Graphite (coal or carbonaceous sed) (none)
Chester-Allentown graphite district Northeast Pennsylvania Metamorphic Graphite (coal or carbonaceous sed) (none)
California Coast Ranges graphite Northwest California; Oregon Metamorphic Graphite (coal or carbonaceous sed) (none)
Northern Washington graphite Northwest Washington Metamorphic Graphite (coal or carbonaceous sed) (none)
Southwest Montana graphite Northwest Montana Metamorphic Graphite (coal or carbonaceous sed) (none)
Sunset Northwest Washington Metamorphic Gneiss U; Graphite (coal or carbonaceous sed) molybdenum; uranium
Central Laramie Range Rocky Mountains Wyoming Metamorphic Graphite (coal or carbonaceous sed) (none)
Rocky Mountain graphite Rocky Mountains Colorado; South Dakota Metamorphic Graphite (coal or carbonaceous sed) (none)
Sweetwater Arch Rocky Mountains Wyoming Metamorphic Graphite (coal or carbonaceous sed) (none)
Wyoming Metasedimentary and Metavolcanic Belts Rocky Mountains Wyoming Metamorphic Gneiss U; Graphite (coal or carbonaceous sed) gold; uranium
Alabama Graphite-Vanadium Belt Southeast Alabama Metamorphic Graphite (coal or carbonaceous sed) (none)
Eastern Blue Ridge graphite deposits Southeast Georgia; North Carolina; Virginia Metamorphic Graphite (coal or carbonaceous sed) (none)
Central and southern California graphite Southwest California Metamorphic Graphite (coal or carbonaceous sed) (none)
Central Texas graphite Southwest Texas Metamorphic Graphite (coal or carbonaceous sed) (none)
Music Valley Southwest California Metamorphic Gneiss REE (monazite, xenotime) thorium; uranium; yttrium
Nevada graphite: Chedic Southwest Nevada Metamorphic Graphite (coal or carbonaceous sed) (none)
Nevada graphite: Grumpy Lizard Southwest Nevada Metamorphic Graphite (coal or carbonaceous sed) (none)
New Mexico graphite Southwest New Mexico Metamorphic Graphite (coal or carbonaceous sed) (none)