Mount Baldy mining district

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

Information leading to the delineation of this focus area

Basis for focus area Precambrian igneous and metamorphic rock complex from the California state geologic map (unit pCc) that covers the Cattle Canyon and Andrew tungsten mine area.
Identified resources Identified resources and historical production of tungsten.
Production 1950-1982 produced 1,100 kg of WO3 concentrate averaging 38.29% WO3.
Status Past mining.
Estimated resources Resources in 1982: 238,210 metric tons of W in Measured, Indicated, and Inferred resources in talus and veins.
Geologic maps Dibblee and Minch (2002), scale 1:24,000; Evans and others (1982), scale 1:48,000.
Geophysical data Magnetic high (523 on Plate 11) over part of the focus area correlated with a quartz diorite and gneissic rock complex (Evans and others, 1982).
Favorable rocks and structures Scheelite veins and skarn hosted in augen gneiss, biotite gneiss, diorite, granodiorite, porphyritic dikes, and quartz monzonite.
Deposits Andrew tungsten mine (MRDS dep_id: 10115273; USMIN Site ID: CA00062), Alron #1, Alron #2, Tiffany-Andrew Group, 4 Hi #1.
Evidence from mineral occurrences MRDS; USMIN; Evans and others (1982).
Geochemical evidence Geochemical analyses done as part of a wilderness study (Evans and others, 1982).
Geophysical evidence Unknown.
Evidence from other sources Unknown.
Comments Focus area included mainly for historical purposes. Part of the San Gabriel Mountains National Monument (GAP status code 3 - subject to extractive use). Relatively inaccessible rugged area of high relief, fire-prone area. Andrew Curtis mine abandoned.
Cover thickness and description Underground mine and exposed scheelite-bearing rocks.
Authors Jane M. Hammarstrom.
New data needs None requested at this time.
Geologic mapping and modeling needs None requested at this time.
Geophysical survey and modeling needs None requested at this time.
Digital elevation data needs Lidar complete.