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Mugwump Mine (Young America Mine; Diamond Peak Mine), Alleghany, Alleghany District (Forest District), Sierra Co., California, USA

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Latitude & Longitude (WGS84): 39° 28' 21'' North , 120° 51' 41'' West
Latitude & Longitude (decimal): 39.47238, -120.86131
A former lode Au occurrence/mine located in secs. 28 & 33, T19N, R10E, MDM, about 1.6 km (1.0 mile) W of Alleghany, on the S slope of Pliocene Ridge, W of Wet Ravine. MRDS database accuracy for this location is not stated. Property was purchased in 1893 for $13,500.

Mineralization is a vein deposit hosted in greenstone and Late Permian slate. The ore body strikes N and dips W at a thickness of 1.22 meters. Both vein walls are tuffaceous slate and may be displaced 100 feet by a northerly fault, though it may be displaced to the N on a reverse fault. The footwall is black conglomeritic slate in the S part of the tunnel. The hanging wall is a dense, green, supposedly altered tuff, 1 inch (2.5 cm) to 3 feet (0.91 meter) thick, with gouge. At the S end of the quartz the strike changes, dip flattens, and the quartz reaches a maximum thickness of 4 feet. The tuffs, or effusives, are altered to white clay in the upper level, but dark slates are easily recognizable. Surface gray clay retains a schistose structure. Au is associated with coarse arsenopyrite. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range).

Workings include surface & underground openings with an overall depth of 38.1 meters and comprised of a 3,000 foot adit with 1,300 feet of drifts on several levels.

Production data are found in: MacBoyle, Errol (1920b).

Major production occurred before 1893. The tailings dump was reported to contain 50,000 to 60,000 tons of material at $1.50 to $2.50 (period values) Au/ton.

Mineral List

3 entries listed. 3 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.


Ferguson, Henry G. & R.W. Gannett (1932), Gold quartz veins of the Alleghany district, California: USGS Professional Paper 172. (no page number provided)

MacBoyle, Errol (1920b), Mines and mineral resources of Sierra County: Calif. In. Bureau Report 16, 144 pp. (published as separate chapter): 133-134.

Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193: 19.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 33.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10034799.

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