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Mary Jane deposit (Liebuck; Kane; Leebrick), Mason, Mason Valley, San Diego Co., California, USA

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A Graphite deposit/prospect located in secs. 3 & 10, T14S, R5E SBM. Also extends into sec. 34, T13S, R5E SBM.

Note by R. Muster: Sec. 34 seems to be an error, it extends actually only into sec. 3, but this is then called the Seyer deposit (Hilton 1939) at N32.98374 W116.46329.

It was first explored in 1915 by Frank Stephen, in 1958 the mining rights were owned by Guy Urquhart.

Mineralization is a graphite deposit in granite, gneiss and pegmatite, consisting of graphite-rich zones in fine-grained schist. The schist carries about 11% graphite in the form of crystalline flakes.

The workings comprised 3 adits up to 96 feet long, 1 shaft 50 feet deep, most of it is now caved in, and several open cuts. The centre is located at N32.97289 W116.46194, elevation 2450 feet.

Mineral List

1 entry listed. 1 valid mineral.

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.


Tucker, W. Burling (1921), Los Angeles field division: California Mining Bureau. Report 17: 378.

Tucker, W.B. (1925): San Diego County. In: Report XXI of the State Mineralogist, Mining in California, Vol. 21, p. 369.

Tucker, W.B. and Sampson, R.J. (1939): Mineral Resources of San Diego County. In: California Journal of Mines and Geology, Vol. 35, p.44.

Weber, F.H., Jr. (1963a) Mines and mineral resources of San Diego County, California. California Division of Mines and Geology County Report 3, 309 pp.: 167-168.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 207.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 56.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, Deposit ID 10286405.

Mineral Availability System (MAS/MILS ID) database file # 0060730359.

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