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Hooten Ranch deposit, Toyon, Pardee District, Calaveras Co., California, USA

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A gemstone (agate-opal) occurrence located in the SW¼ (possibly) sec. 20, T4N, R11E, MDM, 3.3 km (2.1 miles) SW of Toyon, on the N shore of the New Hogan Lake (reservoir / Calaveras River) (On Hooten Ranch about 1 mile from state highway 12). MRDS database stated accuracy for this location is 1,000 meters.

Mineralization is an agate/opal deposit which covers the hill. The veins found range in width from very narrow to 2 inches (5 cm) thick near the surface and thicker underground. Some of the agate appears blue but appears clear when cut thin. Moss agate with white sprays has reportedly been found. Opal is common but probably of good grade as the veins get deeper. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).

Operated as a collect-for-fee site ($1.00 per person at the time).

Mineral List

3 entries 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.


Gems & Minerals (1965), (August): 25.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10028681.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060091410.

USGS crib list.

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