Granite Mountain syenite

Region Central, South Central
Mineral systems
Deposit types
Critical minerals
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Magmatic syenite currently produced from multiple quarries. The focus area outlines the underlying syenite complex.
Identified resources None.
Production None.
Status Current mining of syenite for construction materials.
Estimated resources Unknown.
Geologic maps Haley and Stone (2000, 2001), scale 1:24,000.
Geophysical data Inadequate (Rank 4 and 5) aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Nepheline syenite.
Deposits Granite Mountain Quarries, 3M Quarry.
Evidence from mineral occurrences Known occurrences of nepheline syenite with a region that also includes carbonatitic rocks of the Magnet Cove intrusive complex.
Geochemical evidence Enrichment of REE in bauxite developed on weathered nepheline syenite is consistent with potential for REE in the parent rock.
Geophysical evidence None.
Evidence from other sources Haley and Stone (2000); Haley and Stone (2001).
Cover thickness and description Outcrops to unknown depths under younger sedimentary rocks.
Authors Bradley S. Van Gosen.
New data needs High resolution geophysical surveys to map covered intrusives, geochemistry.
Geologic mapping and modeling needs None.
Geophysical survey and modeling needs Aeroradiometric survey to better define the syenite intrusion; Geophysical modeling of depth to syenite bedrock.
Digital elevation data needs Lidar adequate.