Mammoth Mine (Mammoth group of claim), Keyesville (Keysville), Keyesville Mining District (Keysville Mining District), Kern County, California, USAi

Regional Level Types
Mammoth Mine (Mammoth group of claim)	Mine
Keyesville (Keysville)	- not defined -
Keyesville Mining District (Keysville Mining District)	Mining District
Kern County	County
California	State
USA	Country

A former Au mine located in the SE¼ sec. 35, T26S, R32E, MDM, 0.7 km (0.5 mile) SSE of Keysville. Discovered in 1855. The property is comprised of 12 claims. Owned by the Mammoth Mountain Mining Company, Isabella, California. MRDS database stated accuracy for this location is 100 meters.

Mineralization is hosted in granite and slate. The ore body strikes NE and dips 70E at a thickness of 4.57 meters. The Mammoth vein is 2 to 15 feet thick & 10,000 feet on the lode. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).

Workings include underground openings with a length of 1,200.91 meters. Two veins have been developed on the lower tunnel, known as the Footwall vein and the Hanging Wall vein. The lower, or main, working tunnel is driven S40W for 1,980 feet. At 800 in from the portal, a winze has been sunk on the footwall vein to a depth of 200 feet. At 165 feet below the collar of the winze, a level has been driven on the vein 100 feet to the NE and 180 feet to the SW. Near the loction of the winze, a raise has been put up 95 feet to the No. 4 tunnel. The No. 6 lower tunnel has been advanced a total distance of 1,980 feet. There is a vein of quartz 3 feet wide in the face of this tunnel. About 600 feet S of the winze, there is a raise 122 feet above the tunnel in the footwall of the vein. At 450 feet S of this raise, a raise has been put up 117 feet, intersecting the Sumner tunnel(No. 3 tunnel) level. At 150 feet S of this raise, a winze was sunk on the vein for 50 feet. The width of the vein encountered in the winze shows 3 feet of quartz. Workings on the vein are as follows: No. 6 lower tunnel - 1,980 feet; No. 4 tunnel - 104 feet in elevation above the No. 5 tunnel; No. 5 tunnel - 775 feet; No. 3 tunnel is 119 feet above the No. 5 - 735 feet; No. 2 tunnel, 145 feet above the No.4 - 450 feet. On the No. 2 tunnel, which is located on the SW slope of the hill, the McGill ore shoot is stated to have been 280 feet long, with an average width of 4 feet. This shoot was stoped to the surface a distance of 150 feet. Tunnel No. 3 developed the Tom Lane ore shoot, which is stated to have been 160 feet long by 120 feet high and with an average width of 4 feet. Tunnel No. 4 developed the Higgins ore shoot, which was 500 feet long and 150 feet high, averaging 4 feet in width. In the winze on tunnel No. 5, an ore shoot 120 feet long by 3 feet wide was developed.

Production data are found in: Tucker, W. Burling (1929) & Tucker, W. Burling & Reid J. Sampson (1933).

Gold ran $20-$54 (period values)/ton from tunnel No.2. Ore fromthe winze in tunnel No. 5 ran $17 (period values)/ton, for a total of $20,000 (period values). Tucker reported a production figure of $3,000,000 for a sixty year period since its discovery in 1855.

Other Databases

Link to USGS MRDS:	10109893

Localities in this Region

Other Regions, Features and Areas containing this locality

References