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Dunderburg Mine (Dunderberg Mine), Dunderberg Peak (Castle Peak), Castle Peak District, Mono Co., California, USA

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A former Au-Ag mine located in the E½ SE¼ sec. 19, T3N, R25E, MDM, 4.6 km (2.9 miles) NNE of Dunderberg Peak (coordinates of record), on National Forest and/or state of California land (1 mile ESE from the Green Creek campground) (located claim). Owned by Doland Segerstrom (1978). MRDS database stated accuracy for this location is 10 meters.

Mineralization is hosted in granite. The ore body strikes N and dips 45W at a thickness of 2.74 meters. Ore in the lower tunnel is highly mineralized with pyrite. Alteration is local (oxidation). Local rocks include Mesozoic volcanic rocks, unit 3 (Mojave Desert, Death Valley area, and Eastern Sierra Nevada).

Workings include underground openings with a length of 944.88 meters and an overall depth of 304.8 meters. They are comprised of 3 crosscut tunnels with the upper at 900 feet long. 200 feet below is a 1,700 foot long tunnel, and 800 feet below that is a 500 foot adit with a 100 foot deep winze.

Oxidized ore in the upper tunnel carries values in Au from $20 - $40/ton (period values).

Mineral List

5 entries listed. 5 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.


Conkling, A.R. (1878), Annual report upon geographical survey west of the 100th meridian in California, Nevada, Utah, Colorado, Wyoming, New Mexico, Arizona, and Montana, App. 1: 167-183, App. I, 1: 184.

Wheeler, G.M. (1878), Annual report upon the geographical surveys west of the 100th meridian in California, Nevada, Utah, Colorado, Wyoming, New Mexico, Arizona, and Montana: Appendix of US War Dept. Chief Engineers Annual Report 1878: 184.

Eakle, Arthur Starr & R.P. McLaughlin (1919), Mono County: California Mining Bureau. Report 15: 166-167.

Tucker, W. Burling (1927), Los Angeles, Mono Counties: California Journal of Mines and Geology, California Mining Bureau. (Report 23): 23: 123.

Tucker, W.B., and Sampson, R.J. (1940), Mineral Resources of Mono County: California Journal of Mines and Geology: 36(2): 123, Pl. 1.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 300, 339.

U.S. Bureau of Mines Open-File Report MLA 49-82 (1982), Pl. 1, Nos. 17 & 20.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10007172 & 10212340.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060510033.

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