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Pack Rat Mine, Tule Mountain (Mount Tule; Tulley Mountain), Jacumba, Jacumba District, San Diego Co., California, USA

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Latitude & Longitude (WGS84): 32° 43' 2'' North , 116° 13' 50'' West
Latitude & Longitude (decimal): 32.71722,-116.23056
Köppen climate type:Csa : Hot-summer Mediterranean climate

Granite pegmatite located 7.2 km (4.5 miles) NE of Boulevard; 9.1 km (5.6 miles) WSW of Dos Cabezas; and, 11.7 km (7.3 miles) NNW of Jacumba.


Several 10- to 20-foot-thick granite pegmatite dikes trend north 6 degrees west, dip 65 degrees west, and extend as far as one-half mile in schist and quartzite. Pegmatite pockets contain microcline, green muscovite, black tourmaline (schorl), columbite/tantalite, gem-grade beryl (goshenite and aquamarine), fluorapatite, spessartite, and quartz. Most pockets are filled with montmorillonite clay and range in size from a few inches to several feet.

Workings & Production:

Eight open cuts. According to the claimant in 1986, several specimens of aquamarine and garnet have been sold.

Sample Data:

One random chip sample of green mica contained 6.1 percent potassium, 0.15 percent fluorine, 0.00069 percent beryllium, 0.028 percent lithium, 0.016 percent magnesium, and 0.055 percent manganese. Pockets within the pegmatite were observed to contain several indicator minerals of gem-bearing zones.

Mineral List

22 valid minerals. 1 erroneous literature entry.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Late Cretaceous - Paleoproterozoic
66 - 2500 Ma

ID: 2828910
pre-Cenozoic granitic and metamorphic rocks undivided

Age: to Cretaceous (66 - 2500 Ma)

Stratigraphic Name: Ash Mountain Complex; Placerita Formation; Sur Series

Description: Granitic and metamorphic rocks, mostly gneiss and other metamorphic rocks injected by granitic rocks. Mesozoic to Precambrian.

Comments: Southern California, Mojave Desert, Sierra Nevada, central California Coast Ranges

Lithology: Major:{plutonic,gneiss}, Incidental:{metasedimentary, metavolcanic}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

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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Todd, V. R. et al. (1987). Mineral Resources of the Sawtooth Mountains and Carrizo Gorge/ Eastern McCain Valley Wilderness Study Areas, San Diego County, California. U.S. Geological Survey Bulletin 1711-B, 26 p., maps.
Fisher, Jesse (2011), Mines and Minerals of the Southern California Pegmatite Province. Rocks & Minerals: 86: 14-34.

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