Coast Ranges

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

Information leading to the delineation of this focus area

Basis for focus area Seal and others (2017) and MRDS producers and past producers.
Identified resources Historical production of antimony, gold, and mercury.
Production Stayton Mining District: production limited to ~500 lbs Sn metal, although none since WW II (Aune, 1966).
Status Past mining.
Estimated resources Stayton Mining District: Inferred resources of 181,000 metric tons of ore and 907,000 metric tons of ore at 3% Sb (Bailey and Myers, 1949).
Geologic maps Jennings and others (2010), scale 1:750,000.
Geophysical data Some adequate Rank 2 (75%) and inadequate Rank 3 (25%) aeromagnetic coverage and Rank 5 aeroradiometric coverage.
Favorable rocks and structures Contact between the Coast Range Ophiolite and Great Valley Sequence, Tertiary volcanic rocks.
Deposits McLaughlin mine (MRDS dep_id: 10310645), Quien Sabe mine (MRDS dep_id: 10261617), Ambrose mine (MRDS dep_id: 10110930), French Ranch (MRDS dep_id: 10077206), Shriver (MRDS dep_id: 10040873), Stayton mine (MRDS dep_id: 10106914), Stanton-Santa Clara Claim.
Evidence from mineral occurrences MRDS; Seal and others (2017).
Geochemical evidence Unknown.
Geophysical evidence Unknown.
Evidence from other sources District scale mapping and historical mining.
Comments Most recent large scale mapping is Dibblee (1975), scale 1:62,500; later compilations at a scale of 1:24,000 were done by Dibblee and Minch in 2007, but there is no newer mapping.
Cover thickness and description In the Stayton Mountain District antimony is hosted in Quien Sabe volcanics outcrops.
Authors David A. Ponce, Ben Parrish, Erica Key.
New data needs Updated geologic mapping, geochemistry, aeromagnetic and radiometric surveys.
Geologic mapping and modeling needs Updated geologic mapping for quadrangles not recently published by CGS.
Geophysical survey and modeling needs High-resolution, Rank 1 aeromagnetic and aeroradiometric surveys.
Digital elevation data needs Lidar nearly complete.