Humboldt Granite

Region Central, North Central
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Peralkaline 1.7 Ga A-type granite intrusion in the Upper Peninsula of Michigan containing elevated REE, anomalous Ba, F, Sn, W, and U.
Identified resources Unknown.
Production Unknown.
Status Unknown.
Estimated resources Unknown.
Geologic maps Cannon (1975), scale 1:24,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Peralkaline granite intrusion located along trend of concealed Great Lakes tectonic zone.
Deposits No data.
Evidence from mineral occurrences No data.
Geochemical evidence Geochemical similarities to other rare metal enriched granites.
Geophysical evidence No data.
Evidence from other sources No data.
Comments No reported mineralization, but rock type is permissive for possible critical mineral deposits.
Cover thickness and description Exposed.
Authors Benjamin J. Drenth, Klaus Schulz.
New data needs New mapping, high resolution geophysics.
Geologic mapping and modeling needs Need new geologic mapping.
Geophysical survey and modeling needs Need aeromagnetic, radiometric, and gravity data collection.
Digital elevation data needs Lidar adequate.