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Amador Co., California, USA

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Location is approximate, based on center of defined region.
Latitude & Longitude (WGS84): 38° North , 120° West (est.)
Neighbouring regions:

Geological Overview Of Amador County
Amador County lies almost entirely in the Sierra Nevada geomorphic province; only the extreme western portion lies in the Great Valley. From the Great Valley eastward, the range gradually rises to the glaciated crest in the vicinity of Mokelumne and Thimble Peaks, both of which lie above 9000 feet.

The older rocks of the Sierra Nevada, commonly called the Bedrock series, consist of isoclinally folded, complexly faulted metamorphic rocks of Paleozoic and Mesozoic ages, intruded by several types of igneous rocks, chiefly granitic. Unconformably overlying these rocks in the western portion of Amador County are much younger, nearly flat-lying Tertiary sediments. These nearly flat-lying sediments are commonly called the Superjacent series.

In Amador County, the older metamorphic rocks are divided into the Calaveras and Amador (Taliaferro, 1943, pp. 282-284) groups and the Mariposa formation. The Calaveras group includes all of the pre-Mesozoic rocks in this county while the Amador group and Mariposa formation are Jurassic. Taliaferro has divided the Amador group of Amador County into two distinctive formations: the Cosumnes and Logtown Ridge formations.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.

Mineral List

Mineral list contains entries from the region specified including sub-localities

54 valid minerals.

Rock Types Recorded

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Rock list contains entries from the region specified including sub-localities

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Alphabetical List Tree Diagram

Localities in this Region


This page contains all mineral locality references listed on 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 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.


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Irelan, William, Jr. (1888), Amador County, Mother Lode mines: California Mining Bureau. (Report 8), 946 pp.: 41-96.
Brown, J.A. (1890), Amador, Calaveras Counties: California Mining Bureau. (Report 10): 10: 98-123, 147-152.
Fairbanks, Harold W. (1890), Geology of the Mother Lode region: California Mining Bureau. (Report 10): 10: 23-90.
Preston, E.B. (1893), Amador, Butte, Calaveras, El Dorado, Lassen, Monterey, Plumas, San Benito, Sierra, Tuolumne Counties, also Salton Lake: California Mining Bureau. (Report 11): 11: 139-178, 200-209, 241-242, 259-262, 323-333, 370-373, 387-393, 400-419, 493-513.
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)].
Turner, Henry Ward (1894a), Description of the gold belt; description of the Jackson sheet: USGS, Geol. Atlas Jackson folio (Folio No. 11), 6pp. (reprinted 1914).
Helmhacker, R. (1897),Das Vorkommen der Goldgänge in Amador County, Californien, verglichen mit Eule in Böhman: Berg- u. Hüttenm. Zeit., Band 56: 380-382.
Ransome, Frederick Leslie (1900), Description of the Mother Lode district, California: USGS Geological Atlas, Mother Lode, folio No. 63, 11 pp.
Storms, William H. (1900), The Mother Lode region of California: California Mining Bureau. Bulletin 18.
Lindgren, Waldemar (1911), The Tertiary gravels of the Sierra Nevada of California: USGS Professional Paper 73, 226 pp.
Tucker, W. Burling (1914), Amador County: California Journal of Mines and Geology, California Mines Bureau (Report 14): 14: 39 (New York Mine; Oneida Mine; Original Amador Mine).
Tucker, W. Burling (1916), Amador, Calaveras, Tuolumne Counties: California Journal of Mines and Geology, California Mining Bureau. (Report 14): 14: 1-172; […(abstract): Geol. Zentralbl., Band 27: 396 (1922)]: .
Logan, Clarence August (1927), Amador County, Placer County: California Mining Bureau. (Report 23): 23: 131-202, 235-286.
Logan, Clarence August (1927), Amador County, gold quartz mines, California Mining Bureau. (Report 23): 23: 149-185.
Knopf, Adolf (1929), The Mother Lode system of California: USGS Professional Paper 157, 88 pp.; […(abstract): Engineering & Mining Journal: 128: 24 (1929); […Geol. Zentralbl., Band 41: 364-367 (1930)]
Logan, Clarence August (1934), Mother Lode Gold Belt of California: California Division Mines Bulletin 108, 221 pp.
Cater, F.W., Jr. (1948b), Chromite deposits of Calaveras and Amador Counties, California: California Division Mines Bulletin 134, part 3, chapter 2: 33-60.
Johnson, Fremont T. & Ricker, Spangler (1948), Ione-Carbondale clays, Amador County, California. U.S. Bureau of Mines Report of Investigation 4213, 6 pp. California Journal of Mines and Geology (1949) (Report 45): 45: 491-498.
Wiebelt, F.J., Sanborn, W.C., Trengrove, R.R., and Ricker, A.S. (1951) Investigaton of West Belt copper-zinc mines, El Dorado, Amador, Calaveras, and Mariposa counties. U.S. Bureau of Mines Report of Investigation 4760, 62 pp.
Pask, Joseph Adam and Turner, Mortimer Darling (1952) Geology and ceramic properties of the Ione formation, Buena Vista area, Amador County, California. California Division of Mines and Geology Special Report 19, 39 pp.
Carlson, D.W. & W.B. Clark (1954), Mines and Minerals of Amador County, California: California Journal of Mines and Geology: 50: 167, 173, 175, 179, 180, 185, 189, 215.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
Moore, L. (1968), Gold resources of the Mother Lode Belt, El Dorado, Amador, Calaveras, Tuolumne, and Mariposa counties, California: U.S. Bureau of Mines Technical Progress Report 5: 1-22.
Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193.
Duffield, W.A. ad M.H. Beeson (1973) Two-garnet rodingite from Amador County, California. USGS Jour. Res.: 1: 665-672.
Duffield, W.A. and Sharp, R.V. (1975), Geology of the Sierra foothills melange and adjacent areas, Amador County, California: USGS Professional Paper 827, 30 p.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 75, 436.
Zimmerman, J.E. (1983), The geology and structural evolution of a portion of the Mother Lode Belt, Amador County, California: Unpublished M.S. thesis, University of Arizona, 138 p.

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