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Oneida Mine, Martell, Jackson-Plymouth District, Mother Lode Belt, Amador Co., California, USA

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A former Au-Ag mine located in sec. 17, T6N, R11E, MDM, 1.1 km (0.7 mile) NE of Martell and about 1.5 miles NNW of Jackson, on the E side of Oneida Creek, on private land. Discovered before the 1860's. The mine's holdings were 283 acres. Operated intermittently from the 1860's to 1914. Operated by the South Eureka Mining Co. C/O A. J. Mayman. MRDS database stated accuracy for this location is 100 meters.

This was one of the important early-day lode mines, producing ore averaging as high as $40 (period values) per ton in the 1860's. It was operated intermittently until the late 1890's when extensive development work was done and a new mill erected. After this work, the mine operated until 1914 and has been idle since.

The Oneida Mine is located 1.5 miles northwest of Jackson in the famous Mother Lode Gold Belt in the Sierra Nevada foothills. The mine lies between the adjoining Kennedy Mine on the south and the South Eureka Mine on the north. It is within the Jackson - Plymouth district which was the most productive district of the Mother Lode belt with an estimated total production of about $180 million (Clark, 1970). The Oneida Mine is credited with $2.4 million. (Clark, 1970).

Mineralization is a vein deposit (Mineral occurrence model information: Model code: 273; USGS model code: 36a; Deposit model name: Low-sulfide Au-quartz vein; Mark3 model number: 27) hosted in Late Jurassic slate and greenstone of the Mariposa Formation. The ore body is irregular, tabular & pinch and swell in form . The quartz ore vein in slate lies near the contact with greenstone. The main ore shoot is 8 feet by 150 feet. A small, rich ore body was discovered at the 1,000 foot level. The best ore is at the 1,500 foot level. Production ore occurs to 2,000 foot level with coarse Au in thin quartz seams. Ore materials included free-milling Au in quartz with auriferous sulfides, principally pyrite and arsenopyrite. Gangue materials include quartz, slate and greenstone. The slate is E of the contact; the greenstone is meta-andesite. Controls for ore emplacement included a fissure and ore shoots within mesothermal gold-bearing quartz veins. Local rocks include Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).

The Oneida vein occupies a fissure chiefly in slate near the contact with greenstone to the west (Tucker, 1914). The vein strikes N 27? E and dips 65?east and averages 5 feet wide. At its maximum it is 20 feet wide. The vertical shaft intersected the vien at the 1900-foot level where the hanging wall is greenstone and the foot wall black Mariposa slate, with heavy gouge on the foot wall (Storms, 1900).

The ore shoots have a northerly trend. The main ore shoot is 8 feet wide by 150 feet long and is near the shaft. North of this is an irregularly shaped ore body. A small but rich ore body was developed to the north of this on the 1000-foot level. The best ore was on the 1500-foot level, although there was production down to the 2000-foot level where some coarse gold was found in the thin quartz seam (Carlson & Clark, 1954). Ore in the lower workings is low grade

Ore is free milling gold in quartz with auriferous pyrite, arsenopyrite, and minor amounts of sphalerite and galena.

Workings include underground openings with an overall depth of 694.94 meters. A vertical shaft was sunk in the hanging wall at 2,280 feet deep, cutting the vein at 1,900 feet. An inclined shaft is 1,350 feet deep plus 2 additional shallow, inclined shafts. The Oneida Mine connected with the adjacent South Eureka Mine on the 1,800 foot level.

The Oneida Mine workings included a 2280-foot vertical main shaft in the hanging wall, a 1350- foot 65 degree inclined shaft, and two other shallow inclined shafts (Carlson & Clark, 1954). Levels were driven on the main shaft at 200', 350', 400', 500', 600', 700', 800', 900', 1000', 1100', 1200', 1500', 1700', 1800', 1900', 2000', 2100', 2200'. On the 1200 foot level, the vertical shaft is connected with the inclined shaft by a 500 foot crosscut.

1200-foot level: N 1,200 feet, S 1500 feet
1500-foot level: N 1,400 feet, S 650 feet
1700 foot level: N 250 feet, S 150 feet
1800-foot level: N 750 feet, S 1,505 feet
1900-foot level: N 250 feet, S 200 feet
2000-foot level: N 1,100 feet, S 1,200 feet
2200-foot level: N 450 feet, S 250 feet

A winze was sunk on the 2200-foot level, a 62 degree inclined winze was sunk on the vein 280 feet N of the shaft to a depth of 250 feet.

The ore was milled in a 60 stamp mill. When in full operation, 40-50 men were employed at the mine and mill ((Carlson & Clark, 1954).

Production data are found in: Carlson, D.W. & W.B. Clark (1954)

Total production was in excess of $2,500,000 (period values), before its sale to the South Eureka Mining Co.

Mineral List

8 entries listed. 8 valid minerals.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Irelan, William, Jr. (1890b), Tenth annual report of the State Mineralogist: California Mining Bureau.(Report 10), 983 pp.: 10: 109-110.

Crawford, James John (1896), Thirteenth report of the State Mineralogist: California Mining Bureau. (Report 13): 13: 75.

Ransome, Frederick Leslie (1900), Description of the Mother Lode district, California: USGS Geological Atlas, Mother Lode, folio No. 63, 11 pp.: claim sheet 1, section 1.

Tucker, W. Burling (1914), Amador County: California Mines Bureau Report 14: 39.

Logan, Clarence August (1934), Mother Lode Gold Belt of California: California Division Mines Bulletin 108, 221 pp.: 111-112, Pl. 3.

Carlson, D.W. & W.B. Clark (1954), Mines and Minerals of Amador County, California: California Journal of Mines and Geology (Report 50): 50(1): 188, 255, Pl. 1.

Carlson, D.W. & W.B. Clark (1954), Mines and Minerals of Amador County, California: California Journal of Mines and Geology (Report 50): 50(1): 188, 255, Pl. 1.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 12 (map 2-3).

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10102596, 10187120 & 10310659.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060050279.

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