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Vontrigger Mine (California Mine; Runover Mine; California Gold and Copper Company; Consolidated; Von Trigger Mine; Vontrigor Mine; Dutch Oven Mine; Goodwin vein; Medberry vein), Vontrigger Hills, Signal District (Vontrigger District; Hackberry Mountain), San Bernardino Co., California, USA

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Latitude & Longitude (WGS84): 35° 2' 39'' North , 115° 7' 45'' West
Latitude & Longitude (decimal): 35.0441666667, -115.129166667
A former Cu-Au-Ag occurrence/mine located in secs. 2, 10, 11 & 15, T11N, R17E, SBM, 2.1 km (1.3 miles) SE of Vontrigger Hills (coordinates of record) and 10.3 km (6.4 miles) SSE of Lanfair, on wilderness land (Mojave Preserve). MRDS database accuracy for this location is not stated.

Mineralization is a vein deposit hosted in gneiss and schist. The ore body is 6.1 meters in thickness at a length of 182.88 meters. A brecciated zone trends NE apparently parallel with the planar structure of the schist and gneiss. Mineralization occurs discontinuously along slightly brecciated zones. The Goodwin vein strikes N45E and dips 85NW at a thickness of 6 to 20 feet. The Medberry vein is 485 feet NW of the Goodwin. It strikes N25E and dips 55NW at a thickness of 8 to 20 feet. Malachite is found above 100 to 140 feet, and principally chalcopyrite below that depth. Local rocks include Precambrian rocks, undivided, unit 2 (Mojave Desert and Transverse Ranges).

Workings include surface and underground openings with an overall depth of 91.44 meters and comprised of 3 inclined shafts ranging in vertical depths of 30 to 300 feet. The Medberry shaft is inclined 55 degrees to a depth of 280 feet with levels at 65, 110 & 200 feet. Most ore was stoped above the 100 foot level. The Goodwin shaft is 300 feet deep with levels at 72, 100 and 300 feet. Two other shafts were sunk NE of the Goodwin shaft, on the same ore body. The Twitchel shaft is 96 feet deep and the Scaroni shaft is 30 feet. There are also some shallow pits and open cuts.

Production data are found in: Wright, L.A. (1953): 68-69.

Production statistics: Year: 1907: ore (accurate); grade: ^8.87% Cu. Recovery percentage: 9 weight percent.

Year: 1929 (period = 1926-1929): ore (accurate); grade: ^5.03% Cu. Recovery percentage: 5 weight percent.

Year: 1945: ore (accurate): grade: ^less than 3% Cu. Recovery percentage: 3 weight percent.

Analytical data results: 4 to 7% Cu; $1 to $2 (period values) Au/ton.

Mineral List

5 entries listed. 5 valid minerals.

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Tucker, W. Burling & Reid J. Sampson (1943b), Mineral resources of San Bernardino County: California Journal of Mines and Geology, California Division Mines (Report 39): 39(4): 432, 438.

Wright, L.A., et al (1953), Mines and mineral resources of San Bernardino County, California: California Journal of Mines and Geology, California Division of Mines (Report 49): 49(1-2): 68-69.

Hewett, Donnel Foster (1956) Geology and mineral resources of the Ivanpah quadrangle, California and Nevada, USGS Professional Paper 275, 172 pp.: 119, 142, 143.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 227, 297, 298.

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

U.S. Bureau of Mines, Minerals Availability System (MAS) file #006071

Mineral and/or Locality  
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