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Smitty prospect, Banner, Banner District, San Diego Co., California, USA

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A W occurrence/prospect located 10.3 km (6.4 miles) ENE of Banner in SE1/4 SEC 22 T12S R5E SBM, at N33.11132 W116.45035, elevation 2’320 feet.

Mineralization is hosted in schist and granitoid rocks.

From 1951 to 1956 a number tungsten (scheelite) prospects and claims were located on the slopes of the Grapevine Mountain. Scheelite fluoresces under UV-light and prospectors invested in “black lights”. In daylight they searched for tactite, marble and schist. In the darkness they examined these metamorphic rocks with the “black light”, hoping to detect fluorescent blue spots. Scheelite might be accompanied by brown grossular, green diopside, white wollastonite, calcite, quartz, zoisite, clinozoisite and idocrase. This is the reason why these prospects were also visited by mineral collectors.
A typical example is the San Felipe Garnet Mine, which was never a mine, but started as a prospect and later became a location for mineral collectors till it was included in the Anza Borrego Desert State Park which does not permit collection of minerals.

Mineral List

5 entries listed. 5 valid minerals.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Weber, F.H., Jr. (1963a): Mines and mineral resources of San Diego County, California; California Division of Mines and Geology, County Report 3, p.279.

Rowland, R. W. (1972): San Diego County’s Tungsten Boom – 1951 to 1956. In: Environment Southwest, San Diego Natural History Museum, 1972, p.10.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, Deposit ID 10035205, which shows it in a wrong position (S of Hwy 78 instead of N).

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, Deposit ID 10189584.

Mineral Availability System (MAS/MILS ID) database file # 0060730463.

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