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Mason Valley Gem claim, Mason Valley, Banner District, San Diego Co., California, USA

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Located 10.5 miles SE of Julian in NW¼ sec. 3, T14S, R5E, SBM, on the southwest side of Mason Valley, in a ravine on the east side of a small group of hills, at N32.98162, W116.46216, at an elevation of 2,425 feet. Reportedly owned by D. G. Ingraham in 1939. It is named after the Mason family, desert pioneer farmers in this area.

NOTE: The original Township is erroneously described as 13S in the County Report according to the original database entry.

Mineralization is a pegmatite deposit reported to contain lepidolite and tourmaline.

Workings include surface and underground openings. The prospect is developed by two small cuts and a short adit.

In 1939 John W. Hilton described the 100 feet adit and the minerals listed, but none found was of gem stone quality.

Members of the San Diego Mineral & Gem Society have visited the site many years ago and found grossulars similar, but smaller, than the ones shown by Rob Lavinsky.

In 1999 remains of these activities could still be seen but the adit portal could not be located.

Mineral List

8 entries listed. 4 valid minerals.

The above list contains all mineral locality references listed on 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 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.


Hilton, J. W. (1939): Mine that has everything, except gem stones. In: The Desert Magazine, Volume 3, November 1939: 26–28, 39.

Tucker, W.B., Reed, C. H. (1939): Los Angeles Field District - Mineral Resources of San Diego County. California Journal of Mines and Geology, quarterly chapter of the State Mineralogist Report (Report 35): 35: 55.

Weber, F. H. (1963), Geology and mineral resources of San Diego County, California. California Division of Mines and Geology, County Report 3: 107.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, Deposit ID 10213767.

Mineral Availability System (MAS/MILS ID) database file # 0060730353

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