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Unnamed Sand & Clay Mine (2), Portola Hills, Santa Ana Mountains, Orange Co., California, USAi
Regional Level Types
Unnamed Sand & Clay Mine (2)Mine
Portola HillsGroup of Hills
Santa Ana MountainsMountain Range
Orange Co.County

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Latitude & Longitude (WGS84):
33° 41' 22'' North , 117° 36' 42'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
Portola Hills9,083 (2018)2.1km
Trabuco Canyon3,000 (2014)3.6km
Foothill Ranch11,698 (2018)4.6km
Rancho Santa Margarita49,324 (2017)5.5km
Lake Forest82,492 (2017)8.6km

A former clay pit operation located in sec. 33, T5S, R7W, SBM, 2.1 km (7,000 feet) ENE of Portola Hills.

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Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

Detailed Mineral List:

Reference: Stauffer, C.R. (1945), High Alumina Clays of the Santa Ana Mountain Region, California, U.S. Geological Survey Strategic Minerals Investigation Preliminary Report 3-197 Map No. 56; USGS MRDS database (2005), loc. file ID #10116170.

List of minerals arranged by Strunz 10th Edition classification

Unclassified Minerals, Rocks, etc.

List of minerals arranged by Dana 8th Edition classification

Unclassified Minerals, Mixtures, etc.

List of minerals for each chemical element


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Stauffer, C.R. (1945), High Alumina Clays of the Santa Ana Mountain Region, California, U.S. Geological Survey Strategic Minerals Investigation Preliminary Report 3-197 Map No. 56.
USGS MRDS database (2005), loc. file ID #10116170.
Minerals Availability System (MAS), file ID #0060590033.

Other Databases

USGS MRDS Record:10116170

Other Regions, Features and Areas containing this locality

North America
Pacific PlateTectonic Plate

This page 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.
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