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Grand Victory Mine, Tiger Lily, Placerville District, Mother Lode Belt, El Dorado Co., California, USA

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A former lode Au-Sb occurrence/mine located in the NE¼SE¼ sec. 33 & in the NW¼NE¼ sec. 34, T10N, R11E, MDM, 1.5 km (0.9 mile) ESE of Tiger Lily, N of Squaw Hollow Creek and S of Pleasant Valley Road (4 miles SE of Diamond Springs), on private land. Discovered in 1857. Land holdings are 72 acres. Operated by the Provident Minerals Corp., C/O Floyd Singleton. Operated starting in 1857, 1933 to 1935, 1879 to 1890, and 1894 to 1901. MRDS database stated accuracy for this location is 500 meters. The gold quartz vein on folio 3 seems to be in secs. 33 & 34; listed, but not plotted on the map, Pl. II, Logan (1934).

Mineralization is a vein deposit hosted in schist. The ore body is 30.48 meters. Country rocks include silicified schist, slate, quartzite and limestone of the Calaveras Group. The limestone bodies strike N70E at depth and are 12 to 33 feet thick. The mine is within ½ mile of surface exposure of a granodiorite batholith. The strike of the ore bodies varies from NW to NE and may cut the schistosity of the enclosing rocks. Local rocks include Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada).

Local geologic structures include acid dikes parallel to the ore bodies and diorite dikes strike N58E, N51E, and S77E. A batholith affects country rocks at depth.

Workings include surface and underground openings with a length of 762 meters,, overall depth of 117.35 meters, overall length of 152.4 meters and an overall width of 41.15 meters. They are comprised of a 500 foot drift adit, open cuts as wide as 135 feet. About 450 feet from the adit portal is a winze with 3 levels at 100, 200 and 300 feet. There are also several thousand feet of drifts and crosscuts.

Production data are found in: Logan, Clarence August (1938)

In 1879 the ore was treated in a 5-stamp mill. By 1888 extensive open cuts and underground workings had been developed and a 40-stamp mill was active. A cyanidation plant was installed in 1894 and operated until 1901, when the mine was shut down. Considerable prospecting and development was done in the 1930's. Much of the earlier ore mined was from weathered material.

Analytical data results: In 1885 the ore averaged $2 (period values) Au/ton.

Mineral List



1 entry listed. 1 valid mineral.

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References

Lindgren, Waldemar & Henry Ward Turner (1894), Description of the gold belt, California; description of the Placerville sheet: USGS Geol. Atlas, Placerville folio (Folio No. 3) 3 pp.; […(abstract): Jour. Geol.: 4: 248-250 (1896)].

Logan, Clarence August (1934), Mother Lode Gold Belt of California: California Division Mines Bulletin 108, 221 pp.: Pl. II.

Logan, Clarence August (1938), Mineral resources of El Dorado County: California Journal of Mines and Geology, California Division Mines (Report 34): 34(3): 231-232, 262, Pl. II.

Clark, Wm. B. & D.W. Carlson (1956), Mines and mineral resources of El Dorado County, California: California Journal of Mines and Geology (Report 52): 52(4): 414-415, 505, Pl. 10.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10007085, 10030244 & 10284838.

U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060170816.

 
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