Amador Co., California, USA

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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.

Mineral List

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

Albite Alleghanyite 'Anauxite' 'Andradite-Grossular Series' Ankerite 'Apatite' 'var: Phosphorite' Arsenopyrite 'Axinite Group' Azurite Bornite Calcite Chalcocite Chalcopyrite Chromite 'Chrysoprase' Chrysotile 'Clay'

Clinochlore var: Chromian Clinochlore Copiapite Copper Cuprocopiapite Diamond Epsomite Galena 'Garnet' Gold Graphite 'Grossular-Hibschite Series' Halite 'Halloysite' Hematite Kaolinite Kornelite 'Limonite' Löllingite

Magnesiochromite Magnetite Malachite Marcasite Melanterite Mendozite Molybdenite Opal var: Wood Opal 'Petrified Wood' 'Psilomelane' Pyrite Pyrolusite Pyrrhotite Quartz var: Amethyst var: Chalcedony var: Rock Crystal var: Rose Quartz

Quartz var: Rutilated Quartz var: Smoky Quartz Rhodochrosite Rhodonite Rutile 'Silica' Silver 'Soapstone' Spessartine Sphalerite Stibnite Strengite Talc Tephroite Tetrahedrite Tremolite Uvarovite Wollastonite

75 entries listed. 49 valid minerals.

Localities in this Region

USA California Amador Co. A. J. Ringer Ranch Placer Mine A & B Reeves Mine Acme Consolidated Prospect (Robinson) Ajax Alexander prospect (Alexander property; Lucille) Allan property Allen Property (Wheeler Mine; Johnson Lease) Allen Ranch Placer Mine Allison Prospect Alphi Prospect (Alpi) Alpine Wheeler Mine (Johnson Lease) Alta Extension Mine Alta Mine Ama Oro (Whitmore) Amador Central Amador King Prospect (Rhetta) Amador Lime Rock American Cement Company Amick Arata Property Arroyo Seco Ranch Placer Associated Mining Company Property Atlantic Prospect Avala Prospect Ayers; Charlers Babcock Bacon Clay Pit (Airplane Pit) Bacon Pit Badger Mine Baker Hill Baliol Mine Ballard Mine (Ballard and Martin Mine) Baratini Mine Bartlett Battle Mountain Beatrice Prospect Belmont Prospect Ben Brown Pit Berry Mine Betty Lu Placer Mine Big Gulch Claim Big Pine Mine Bighorn Mine Black Metal Black Wonder Mine Boardman Placer Mine Bona Fortuna Prospect Boring Shale Pit Boro Prospect Boyson Prospect Bright Placer Mine Bruce Prospect Bruschi Ranch Placer Mine Bryan Prospect Buena Vista Dredge No. 3 Buena Vista Pit (Buena Vista Peak Pit) Bull Run Mine Burlington Prospect Caledonia Mine California Group (Potosi) Capital Carbondale Unnamed Cr occurrence Centennial Mine Chalk Hill Chaney Pit Chaparral Prospect Cheney Hill Pit Chicago Chief Prospect Chili Jim Prospect (Chili Joe) China Gulch Prospect China Hill Quarry Chitwood Chocolate Prospect (Harvey Prospect) Clapboard Placer Mine Clark Placer Mine Clark Sand Pit Clarsona Clay pit (MRDS - 10211635) Clay Pits (MRDS - 10211636) Cleveland Consolidated Placer Mine Clinton (Irishtown) Clinton Consolidated Mine (Union Consolidated; Clinton Bar Placer Mine) Clipper Placer Clyde and North Clyde Prospect Colorado Group Columbus Gold Gravel Placer Comet Prospect Confidence Prospect Consolidated McNamara Prospect (Price McNamara Prospect) Consumnes River Lorentz Property Consumnes River Placers - Plymouth (Cosumnes River Placers) Contini Mine (Mikado) Cosmopolitan Group (Providence; Dry Creek; Henry Clay) Coulter Prospect Courtwright Property - Woods and Roach Lease Crannis Prospect Creek Ledge Croesus and St. Martin Prospect Crown Point (Drytown Consolidated) Custer deposit Dane & Mitchell Mine Deaver Prospect (Reeves Mine) Defender Defiance Del Porto Marble Delta Placer Gold Company Denend Placer Mine Detert Property Deutschke Pit Dew Drop Dewitt Mine (Haley; Dewitt No. 1 and No. 2) Dickson Pit Dondero Carrara Quarry Dooley Property Dosch Pit (Clark Pit) Douglas Downs Mine Dredge Area (MRDS - 10187025) Dredge Tailings (MRDS - 10091934) Dredge Tailings (MRDS - 10114548) Dredge Tailings (MRDS - 10163143) Dredge Tailings (MRDS - 10186879) Dredge Tailings (MRDS - 10235495) Dredge Tailings (MRDS - 10259745) Dredge Tailings (MRDS - 10259857) Drytown Fremont Mine (Fremont-Grover Mine) South Cosmopolitan Group (Worley) Du Frene prospect (Empire Mine; Pacific Mine) E. A. Culver Prospect E. A. Kent Dredge No. 1 (Burden Ranch) Eagle's Head East Amador (Little Amador Mine) East Belt East Eureka Prospect Echo Restoration and Other Claims Ecklund Property Edwin Deposits El Dorado Mine (Eldorado Mayon Mine) Elephant Hydraulic Elephantine Prospect Elkhorn Mine (Haywire Mine) Ellis Brothers Ranch Elmer Evans Deposit Elwood Orr Placer Empire Prospect Enoch Prospect Eureka No. 2 Prospect Everett prospect (Everett deposit) Excelsior Prospect (Idaho Jr. Prospect) Excramer Gold Mine Extension Mine Fancher Farci Pit Farrell Prospect Fiddletown Fiddletown deposit Florence Focus Forest Home Fort Ann Mine (Acme; Robinson) Fort Grizzly Placer Fort John Forty Nine Prospect Frank P. and Annie Del Porto Property Placer G. J. Alexander Garibaldi Dredge Garibaldi Ranch Garibaldi Ranch Mine George Kretcher Property Giant Gillett Mine Glavich Placer Mine Goat Ranch Mine (Golden Gate Consolidated) Gold Gravel Mines Gold Mountain Mine (Quartz Mountain) Gold Placer Gravel Golden Crown (Gold Crown) Golden Eagle Prospect (Triumph Prospect) Golden Gate Golden Gate Prospect Golden Gate Prospect (Golden Gate Consolidated) Governor Bradford Prospect Grand Prize Mine Granite State Prospect Great Eastern Prospect Green Prospect Greenstone Quarry (Greenstone Quarry) Grelich Ranch Grelich Ranch Grey Eagle (Gray Eagle) Gritton and Keefer Placer Mine Hageman Mine Hammer Hams Salt Springs (Salt Springs Reservoir) Hardscrabble Prospect Hartford Hayward Mine (Allen) Herbertville Midian Mine Hercules Prospect Holsinger Placer Mine Homestake Prospect Honula (Honolulu Lady) Hope Fountain Horton Placer Hubbard and McAdams Prospect Humbug Diggings Placer Mine I. X. L. Placer Mine Illinois Mine (Green) Indian Creek Placer Mine Indiana Mine Ione Ione Coal and Iron Company Deposit Ione Formation Ione Pit and Mill Ione Quarry Irish Hill Irish Hill Gage Irish Hill Placer Irma and Weldon Prospect Iron Cliff Prospect Jack Jackson-Plymouth District Amador City Soapstone lode (Soapstone outcrop) Treasure Mine (Hazard Mine) Drytown Enterprise Jackson Plymouth Jackson Butte Jackson Valley Quarry Jill Joe Davis Prospect Joe Garibaldi Ranch John McCulloh Property John Orr Property John Tonzi Property Johnson Ranch Jose Gulch Mine (Brown; Aurora) Julia Prospect Jumbo Mine Jupiter Kaolin-Eye Pit Kate Gray Placer Katherine and Adeline Kearsing Kelly Kennedy Extension Prospect

USA California Amador Co. Kent Dredging Company King and Enos (Free) Kreth Ranch Placer Mine L. K. Hall Prospect L. Ludekins Placer Mine Lady Bedford Prospect Lagomaraino Drift Tunnel Placer Lancha Plana Gold Dredging Company Last Chance Laterite Pit Lee Stock Lessley Ranch Placer Mine Lilly Dredge Little Illinois Mine Little Sargent Prospect Littlefield Prospect (New Albany Consolidated; Middle Bar G.M.; Middle Bar Group) Live Oak Mine Loncha Plana Gold Dredge Lot 232 Lignite Pit (Coal Mine No. 4) Lot 274 Pit Lucky Girl Maddox Clay Company Prospect Malinda Setter Properties Marklee Mine (Markley; Alturas) Martell Maryland Prospect Matulich Property Maximilian Prospect May Ella (Mayella) McGuire Pit McIntire Mine McKay and Love Prospect McKinney and Crannis Prospect (Crannis) Mechanics (Potazuba) Meehan Consolidated Prospect Mexican Mine (Reed Flat) Middle Bar Quartz Mine Midway and Esmeralda Prospect Min. Seg.; Patented (MRDS - 10138138) Mineral City Mineral Entry No. 613 Mineral Point Modoc Prospect Mokelumne River Monitor Prospect Monte De Oro Monte Richard Prospect (Monterichard Prospect) Montezuma (Crocker-Preston Prospect) Moon Prospect Moore Creek Mining Company Mother Lode Belt Mountain Gold Dredging Company Mountain King (Mountain Queen Pitts; Pitts) Mueller Placer Mine Mungo Park Mutual Life Insurance Company Mutual Mine Nevada Wabash (Wabash) New Albany New Hope Mine New London Prospect (Lucille) New Years Consolidated New York Mine (Anderson Mine) Newtonville Niagara Mine No. 1 and No. 2 Prospect North California Prospect (Webster) North Eureka No. 2 Prospect North Gover Prospect North Henry Clay Prospect North Lincoln Prospect North Star Mine Nother Carbondale Mine Nottus Mine O'Neal Sandstone Quarry (Barnett Quarry) Oaks Prospect Occident Prospect Old Oaker Mine (Daggett Lease) Oleta Onondago Prospect Oro Grande Osceola Prospect Owens Illinois Inc. Pardee District Parker Pathfinder Mine Peerless Mine (Homestake; Coulter; Seaton) Penavita Mine Pendola Prospect Pension Perini deposit (Perini Peyton et al lease) Peterson Mine Peyton deposit (Peyton Crocker-Preston prospect) Philadelphia Prospect (Richmond) Pick and Drill Pine Grove District Pine View No 1 Lode Claim Pioneer Mine Placer Deposit (MRDS - 10186972) Placer Deposit (MRDS - 10187134) Placer Deposits (MRDS - 10284172) Placer Gravel (MRDS - 10138541) Placer Gravel (MRDS - 10186868) Placer Gravel (MRDS - 10235227) Placer Gravel (MRDS - 10284017) Placer Gravel (MRDS - 10284414) Placeritas Mining Company Plymouth-Eureka Prospect Plymouth Area Caucasian Consolidated Mine Taylor Ranch Mine Plymouth Rock Pocahontas Mine Poclepovich Prospect Podesta Pratt's Hill Deposit Price Prospect (Prize) Providence Prospect Questa Prospect R. H. Hingston Ranch Placer Mine R & M Mining Company Rainbow Mine Randell Placer Ratto Mine Raymond Mining Company Prospect Red Cloud Red Crown Prospect Red Hill Mine Red Oak Prospect Red Star Relvas Gravel Deposit Rendell Reward Mine (Clough) Rim Can Dredge Rising Star Mine Roberts Lease Mine Rodonich Property Ruhser and Hubberty Deposit Rupley Ranch Placer Mine Russel Prospect Sally Placer Mine San Andreas Dredge Sand Plant Calcine No. 2 Santa Clara Placer Mine Schully Ranch Placer Mine Sclavonia Prospect Secor Dredge Shakespeare Mine Shenandoah Prospect (Easton Prospect; G. W. Easton Property) Shepard Barber Sierra Madre Stone Company Silva Placer Smokey No. 1 Smokey No. 2 Smokey No. 3 Solari Carlile Clay and Sand Somerset South Keystone Mine South Spring Hill Mine Spring Hill (Herbertville; Talisman) St. Julian Prospect (St. Junian Prospect) Stevich Placer (Stavich Placer) Stickel Sunnyside Placer Mine Sunset Swingle Property Tellurium Mine Templeton Thayer Mine (Grey House Mine; Greyhouse Mine; Grayhouse Mine) Thomas Iron Deposit (Anderson Lease) Three-In-One Mine Tierakoff Mine Tiger Mine TNT Mine Tom and Dick Trench (Trencher) Tri Mountain Tripp Prospect Trojan and N. Trojan Two Mining Locations Unidentified Workings (MRDS - 10114200) Union Flat Placer Unknown (MRDS - 10028018) Unknown (MRDS - 10028058) Unknown (MRDS - 10028287) Unknown (MRDS - 10028294) Unknown (MRDS - 10028296) Unknown (MRDS - 10028305) Unknown (MRDS - 10028324) Unknown (MRDS - 10028336) Unknown (MRDS - 10029539) Unknown (MRDS - 10091932) Unknown (MRDS - 10091942) Unknown Prospect (MRDS - 10028051) Unknown Prospect (MRDS - 10028112) Unnamed Adit (MRDS - 10114273) Unnamed Clay pit (MRDS - 10138325) Unnamed Clay pit (MRDS - 10162569) Unnamed Clay pit (MRDS - 10284092) Unnamed Location (MRDS - 10187412) Unnamed Location Prospect (MRDS - 10187634) Unnamed Mine (MRDS - 10114178) Unnamed Mine (MRDS - 10114381) Unnamed Mine (MRDS - 10114678) Unnamed Mine (MRDS - 10114728) Unnamed Mine (MRDS - 10138765) Unnamed Mine (MRDS - 10162682) Unnamed Prospect (MRDS - 10076456) Unnamed Prospect (MRDS - 10114297) Unnamed Prospect (MRDS - 10260205) Unnamed Prospect (MRDS - 10284199) Unnamed Prospects (MRDS - 10187394) Unnamed Quarries (MRDS - 10110621) Unnamed Quarry (MRDS - 10187258) Unnamed Quarry (MRDS - 10211185) Unnamed Quarry (MRDS - 10260042) Unnamed Shaft (MRDS - 10138342) Velvet Venture Prospect Victoria Prospect Volcano Volcano Limestone Volunteer Mine Votaw Ranch Placer Mine Vulture Prospect W. G. Anderson Property Wabash Prospect Wagon Wheel Wait Marble Prospect Wait Property Wallen Prospect West Eureka Prospect West of Lancha Plana West Side Prospect West Somerset Western Refractories Wetzler (Watzler Prospect) White Mountain Whomea Wild Cat Prospect Wonder Mine Woolford Wyomea Mine (Mooney Claim) Yaru No. 1 Yaru No. 2 Yellow Jacket Mine Yosemite Pits (Harvey Pits)

References

External Links