Yuba River Placer District

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

Information leading to the delineation of this focus area

Basis for focus area Outline of placer localities in MRDS with PGE production listed by Peterson (1994); localities may not be exact.
Identified resources Historical production of gold and PGE.
Production Yuba River Placer District produced about 6,702 oz PGE.
Status Past placer mining.
Estimated resources Unknown.
Geologic maps Saucedo and Wagner (1992), scale 1:250,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Placers and tailings deposits.
Deposits Hammonton district (MRDS dep_id: 10310626).
Evidence from mineral occurrences MRDS; other MRDS sites in and near this focus area are described as Au-PGE placers, but the presence of PGE is not substantiated at all localities.
Geochemical evidence Data from Peterson (1994).
Geophysical evidence Unknown.
Evidence from other sources None.
Comments Reworking of historical tailings, especially if coupled with mercury cleanup, could provide potential PGE resources if technology and economic incentives warranted the effort.
Cover thickness and description Surface alluvial/tailings deposits.
Authors Jane M. Hammarstrom, Erica Key.
New data needs Updated geologic mapping, lidar, geochemistry, aeromagnetic and aeroradiometric surveys.
Geologic mapping and modeling needs Updated geologic mapping.
Geophysical survey and modeling needs High-resolution, Rank 1 aeromagnetic and aeroradiometric surveys.
Digital elevation data needs Lidar complete.