Birch Creek

Region West, Northwest
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Tungsten, Cu, Au, and Ag hosted in limestone-hosted skarns. Focus areas are the contacts between the granodiorite intrusions and limestone.
Identified resources Historical production of copper, gold, lead, and silver.
Production Indian Queen mine (1902-1949): 308 oz Au, 43,744 oz Ag, 1,771,824 lbs Cu, and 5,464 lbs Pb.
Status Past mining. Past exploration for W resources by surface sampling of dumps and prospect pits in the 1950s.
Estimated resources Unknown.
Geologic maps Loen and Pearson (1989), scale 1: 250,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Skarn developed along contact between Mission Canyon Limestone and Pioneer batholith.
Deposits Indian Queen mine (MRDS dep_id: 10078274), Greenstone mine (MRDS dep_id: 10102054).
Evidence from mineral occurrences MRDS.
Geochemical evidence Scheelite was reported from prospect pits and adits that were not developed into operating mines.
Geophysical evidence Unknown.
Evidence from other sources None.
Comments Skarns forming pods along the contact with granodiorite crop out on the surface and were explored by shallow prospects for W and Cu resources. A W resource was found at the Stanfield prospect and an attempt was made to put the property into production. A grade of 0.02 to 0.21% tungsten oxide was reported by Geach (1972).
Cover thickness and description Exposed at the surface.
Authors Stanley L. Korzeb.
New data needs High resolution geophysics, lidar, geochemistry, geologic mapping, trace element analysis on skarn related intrusions, and skarns for critical elements.
Geologic mapping and modeling needs Detailed mapping of the known skarns and intrusive contacts could be used to develop a geologic model for the district. Geophysics may uncover skarn deposits that do not crop out on the surface and find extension of the known skarns.
Geophysical survey and modeling needs High resolution geophysical survey to help identify exploration targets that are not exposed on the surface.
Digital elevation data needs Lidar inadequate.