| 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 |
Placers were mined in the late 1800s and early 1900s; production exceeded 2,500 lbs (1,134 kg) scheelite concentrate averaging 38.29% W03. |
| Status |
Past placer mining. |
| Estimated resources |
Tungsten placer deposits (scheelite-bearing alluvium) extend about 3 mi (5 km) through a relief of more than 2,600 ft (800 m) along Cattle Canyon. U.S. Bureau of Mines identified submarginal resources estimated to contain 20 million yd3 (15 million m3) of alluvium. |
| 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 in alluvium and talus mined along Cattle Canyon. |
| Deposits |
Cattle Canyon placers. |
| 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 mainly included 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. |
| Cover thickness and description |
Exposed. |
| 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. |
