Triumph Mine, Whitlock (Farmer's Hope; Whitlock Creek; Whitlock Gulch), Whitlock District, Bagby-Mariposa-Mount Bullion-Whitlock District, Mother Lode Belt, Mariposa Co., California, USA
|Latitude & Longitude (WGS84):||37° 33' 19'' North , 120° 0' 17'' West|
|Latitude & Longitude (decimal):||37.5552777778, -120.004722222|
A former lode Au mine located in secs. 29 & 32, T4S, R18E, MDM, 1.3 km (4,300 feet) E of Whitlock, along Sherlock Creek (4 miles N of Mariposa), on private land. Operated by Mrs. G. C. Griffith. MRDS database stated accuracy for this location is 1,000 meters.
Mineralization is a vein deposit with 2 veins hosted in greenstone. The ore body strikes N and dips E steeply at a thickness of 0.25 meter. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
Workings include underground openings with a length of 152.4 meters and an overall depth of 60.96 meters, comprised of a shaft and drifts.
2 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
145 - 201.3 Ma
|Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains)|
Age: Jurassic (145 - 201.3 Ma)
Stratigraphic Name: Copper Hill Volcanics; Gopher Ridge Volcanics; Logtown Ridge Formation; Mariposa Formation; Monte de Oro Formation; Oregon City Formation; Peaslee Creek Volcanics; Penon Blanco Formation; Brower Creek Volcanic Member; Smartville Complex
Description: Undivided Mesozoic volcanic and metavolcanic rocks. Andesite and rhyolite flow rocks, greenstone, volcanic breccia and other pyroclastic rocks; in part strongly metamorphosed. Includes volcanic rocks of Franciscan Complex: basaltic pillow lava, diabase, greenstone, and minor pyroclastic rocks.
Comments: Western Sierra Nevada and western Klamath Mountains. Mostly basaltic to andesitic breccias, flows, and tuffs, metamorphosed but with primary volcanic features generally recognizable. Minor associated sandstone and conglomerate. Largely or entirely of marine origin. Includes some rocks interpreted as ophiolites (Smartville complex)
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. 
Laizure, Clyde McK (1928), Mariposa, Madera Counties: California Journal of Mines and Geology, California Mining Bureau (Report 24): 24(2): 137.
Bowen, O.E., Jr. & C.H. Gray, Jr. (1957), Mines and mineral deposits of Mariposa County, California: California Journal of Mines and Geology (Report 53): 53(1&2): 312.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10031140 & 10261188.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060430475.