Castle stock

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

Information leading to the delineation of this focus area

Basis for focus area Metallic mineral deposits occur as skarns, fissure veins, and replacement veins. Intrusions and skarn deposits along contacts between intrusions and carbonate rocks.
Identified resources Historical major production of lead, silver, and zinc, with minor production of copper, gold, and manganese.
Production Cumulative production from the Castle Mountain district was about 38,000,00 lbs Pb, 2,150,000 troy oz Ag, and 147,000 lbs Zn (Winters, 1968).
Status Past mining.
Estimated resources Unknown.
Geologic maps Reynolds and Brandt (2006), scale 1:100,000; McDonald and others (2005), scale 1:100,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Intrusions and related skarns.
Deposits Yellowstone mine (MRDS dep_id: 10070481), Powderly mine (MRDS dep_id: 10246160), Cumberland mine (MRDS dep_id: 10105639).
Evidence from mineral occurrences MRDS.
Geochemical evidence Winters (1968) published two soil geochemical anomaly maps for base metals. Zinc is elevated in places (> 300 ppm). No other elements are specified.
Geophysical evidence None.
Evidence from other sources Skarns and associated intrusions are known in other districts to have resources of critical minerals.
Comments Exploration was only for precious and base metals hosted by skarns. Future exploration could be focused on the intrusive bodies and related skarn deposits.
Cover thickness and description Partially exposed at the surface and extends to unknown depth; some glacial cover.
Authors Stanley L. Korzeb, Kaleb C. Scarberry, Jay A. Gunderson, Joshua M. Rosera.
New data needs High resolution geophysics, whole-rock geochemistry for all critical minerals, geologic mapping, lidar.
Geologic mapping and modeling needs 1:24,000 scale geologic mapping.
Geophysical survey and modeling needs High resolution aeromagnetic and aeroradiometric coverage.
Digital elevation data needs Lidar inadequate.