Region West, Northwest
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area LIP-related conduit-type Cu-Ni-PGE. Mafic sills associated with a large igneous province intruding sulfur rich rocks in the lower part of the Belt Basin.
Identified resources Unknown.
Production Minor extraction of material in the Revais Creek district in Montana and in Boundary County, Idaho.
Status No current mining. Minor exploration by small miners in Boundary County.
Estimated resources Unknown.
Geologic maps Entire area is covered by maps ranging in scale from 1:100,00 to 1:250,000-scale. See Zientek, Derkey and others (2005) for digital compilation of the maps.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Mafic sills and intrusions are potential sources of metals (Cu, Ni, and PGE). Sulfur from the Prichard Formation or correlative rocks.
Deposits Revais district, Montana: Blue Ball, Drake, Revais; Boundary County, Idaho: Montgomery prospect (MRDS dep_id: 10067859).
Evidence from mineral occurrences MRDS; Kiilsgaard (1951).
Geochemical evidence Kiilsgaard (1951) discussing the Montgomery mine: "Assays made on the drill cores contain as much as 3.5 percent copper and 1.1 percent nickel.
Geophysical evidence Unknown.
Evidence from other sources Unknown.
Cover thickness and description Heavily forested. Complex structure-in fold and thrust belt.
Authors Michael L. Zientek.
New data needs Sampling to determine if any of the sills have lithogeochemical characteristics consistent with extraction or concentration of magmatic sulfide minerals.
Geologic mapping and modeling needs None requested at this time.
Geophysical survey and modeling needs High resolution, Rank 1 aeromagnetic and aeroradiometric coverage. EM surveys to look for conductors.
Digital elevation data needs Lidar is inadequate.