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Estelle Mine (Troeger's tunnel), Cerro Gordo, Cerro Gordo District, Inyo Mts (Inyo Range), Inyo Co., California, USA

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A former Pb-Ag-Au-Zn mine located in sec. 23, T16S, R38E, MDM, 2.5 km (1.5 miles) SW of Cerro Gordo. MRDS database stated accuracy for this location is 100 meters.

Mineralization is a vein deposit hosted in Late Devonian limestone. The ore is in structurally controlled fractures. There are 2 veins. The San Felipe vein strikes N35W and dips 70SW. The Santa Maria vein strikes N-S and dips 60E. Recent mapping indicates that the San Felipe vein was not reached, a parallel vein was. 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 5,494.63 meters. The Dellaphine tunnel was driven N70E for 8,070 feet at 6,290 feet of elevation.
Drifting on the main tunnel totals 4,783 feet. The main raise is 800 feet. Total workings from the 140, 340 & 660 levels from the main raise is 9,957 feet.

Production data are found in: Tucker, W. Burling & Reid J. Sampson (1938).

Production statistics: Year: 1926: ore: ^0.16 ounces Au; 20.8 ounces Ag; 21.61% (weight per cent) Pb. Total value was $80,146 (period values).

Mineral List

Mineral list contains entries from the region specified including sub-localities

8 entries listed. 7 valid minerals.

Localities in this Region


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.


Waring, Clarence A. (1915), Inyo County; 15th Report of the State Mineralogist, California Mining Bureau (Report 15): 15: 104.

Tucker, W. Burling & Reid J. Sampson (1938), Mineral resources of Inyo County, California: California Journal of Mines and Geology; California Division of Mines (Report 34): 34(4): 437-440.

Norman, L.A. & Richard M. Stewart (1951), Mines and mineral resources of Inyo County, California: California Journal of Mines and Geology (Report 47): 47(1): 69-70.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10076624 & 10285243.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060270138.

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