Burcham Mine (Total Wreck Mine; Burcham vein; Mulcahy vein), Calico, Calico District (Daggett District; Calico-Daggett area), Calico Mts (Calico Hills), San Bernardino Co., California, USA
|Latitude & Longitude (WGS84):||34° 57' 0'' North , 116° 52' 33'' West|
|Latitude & Longitude (decimal):||34.95, -116.875833333|
A former Pb-Ag-Au-Cu-Zn occurrence/mine located in sec. 15, in the SE¼ sec. 16 and in the NE¼ sec. 21, T10N, R1E, SBM, 1.1 km (0.7 mile/3,500 feet) W of Calico (12 miles NE of Barstow). Operated intermittently during the period 1927 to 1945. MRDS database stated accuracy for this location is 10 meters.
Mineralization is a vein deposit hosted in volcanic breccia (agglomerate). The ore body is irregular in form. Irregular masses in faulted Tertiary tuffs, flows, and breccia. There are 2 veins. The Burcham vein strikes N70W and dips 35-65S at a thickness of 3 to 7 feet. The Mulcahy vein, 300 to 500 feet N of the Burcham vein, strikes N45W and dips 65S at a thickness of 4 to 30 feet. Controls for ore emplacement included faults. Rocks comprise a closely related series of Tertiary flows and associated tuffs, conglomerates, or breccia. They are cut by numerous dikes and irregular intrusions of rhyolite and other rocks. The oldest, most important, ore-bearing formation is an interbedded series of rhyolite flows, including breccias, massive tuffs, porphyritic flows, banded flows and water-laid deposits of several kinds of volcanic debris, including well-laminated silts. Associated rocks include Pliocene rhyolite. Local rocks include Tertiary volcanic flow rocks, unit 16 (Northern Mojave Desert).
Local geologic structures include faults.
Workings include underground openings with a length of 3,048 meters
and comprised of a crosscut tunnel driven N15E for 512 feet. It intersected the Burcham vein 104 feet from the portal. Drifts were driven 200 feet SE and 640 feet NW. A 150 foot shaft was sunk at the intersection of the vein. Two raises were driven to surface. The Mulcahy vein intersected by a crosscut tunnel with a drift 500 feet NW and 240 feet SE.
Production data are found in: Goodwin, J.G. (1957): 619.
The average smelter recovery was 11% Pb, 2.05 ounces Ag, 0.404 ounce Au/ton, plus recoverable Zn & Cu.
7 valid minerals.
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 Macrostrat.org
|Zanclean - Aquitanian|
3.6 - 23.03 Ma
|Tertiary volcanic flow rocks, unit 16 (Northern Mojave Desert)|
Age: Neogene (3.6 - 23.03 Ma)
Stratigraphic Name: Alvord Peak Basalt; Artist Drive Formation; Barstow Formation (part); Funeral Fanglomerate (part); Gem Hill Formation (part); Greenwater Volcanics; Red Buttes Quartz Basalt; Ricardo Formation (part); Saddleback Basalt; Tropico Group
Description: Tertiary volcanic flow rocks; minor pyroclastic deposits.
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. 
Storms, William H. (1890), The mines of Calico district, San Bernardino County, California: Engineering & Mining Journal: 49: 382-383.
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): 475-476.
Wright, L.A., et al (1953), Mines and mineral resources of San Bernardino County, California: California Journal of Mines and Geology: 49(1-2): tabulated list No. 238, p. 73.
Goodwin, Joseph Grant (1957) Lead and zinc in California. California Journal of Mines and Geology, Division of Mines: 53(3&4): No. 187, p. 619.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 126.
Weber, F.H., Jr. (1966a), Silver mining in Old Calico. California Division of Mines and Geology Mineral Information Service:19: 71-80.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 47 (map 2-26), 196 (map 5-5).
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10034021 & 10140751.
U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060710238.