El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USAi
| Regional Level Types | |
|---|---|
| El Dorado Mining District | Mining District |
| Mother Lode Belt | Belt |
| El Dorado Co. | County |
| California | State |
| USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
38° North , 120° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~5km
Locality type:
KΓΆppen climate type:
Location and History
This district is in west-central El Dorado County a few miles southwest of Placerville. It is in the Mother Lode gold belt and includes the Logtown area a few miles to the south of El Dorado. El Dorado, originally known as Mud Springs, was a camp on the Kit Carson emigrant trail before the beginning of the gold rush. There was much activity here during the gold rush and for some years afterward. The Church, Union and other mines were worked on a large scale during the 1890's and early 1900's. There was some work in the district again in the 1930's, but only minor prospecting since. This district is to the N of the Nashville District.
Geology
Slate of the Mariposa Formation (Upper Jurassic) occurs in the central portion of the district. Massive greenstone of the Logtown Ridge Formation (Upper Jurassic) is to the west, and granite rocks, schist and amphibolite lie to the east. The Mother Lode Belt here bends from the north to the northeast towards Placerville.
Ore Deposits
Most of the quartz veins in this district are confined to the slate, although a few are in greenstone and schist. They have north to northeast strikes and usually range from five to 10 feet in thickness. The ore contains free gold and pyrite and has an average content of about Yo ounce of gold per ton. Considerable high-grade ore was recovered from shallow workings. Much fault gouge is present. The greatest depth of development is about 2,000 feet.
Mines
Bidstrup, Buena Vista, Church ($1 million), Crown Point, Crusader, German, Griffith, Larkin, Martinez, McNulty, Ophir, Pochahantas, Red Wing, Starlight, Tullis, Union ($5 million?).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity 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-localities16 valid minerals.
Detailed Mineral List:
| β Arsenopyrite Formula: FeAsS Reference: Emmons and Becker (1885) Statistics and Technology of the precious Metals. Census reports Tenth census. June 1, 1880, Volume 13 By United States. Census office. 10th census, 1880, United States. Census Office |
| β Bornite Formula: Cu5FeS4 Localities: Reference: Clark, Wm. B. & D.W. Carlson (1956), Mines and mineral resources of El Dorado County, California: California Journal of Mines and Geology: 52(4): 480; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 93. |
| β Calcite Formula: CaCO3 Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10310688. |
| β Chalcopyrite Formula: CuFeS2 Localities: Blue Cat Mine (Magdalena; Madelina; Madeline), Logtown, El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA E. E. Copper Mine (E. E. Copper deposit), Logtown, El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA Noonday Mine, Logtown, El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
| β Diopside Formula: CaMgSi2O6 Colour: Dark green Description: Occurs as fine crystals. Reference: Hanks, Henry Garber (1884), Fourth report of the State Mineralogist: California Mining Bureau. Report 4, 410 pp. (includes catalog of minerals of California pp. 63-410), and miscellaneous observations on mineral products): 318; Kunz, George Frederick (1889), Apophyllite from California: Soc. Franc. Mineralogie, Bulletin 12: 80; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 307. |
| β Galena Formula: PbS Localities: Martinez Gold Mine (Martinez Mine; Martinez Hillside group; Bismark claim; Gold reef claim; Hillside Extension claim; Hillside Extension No. 3 claim; Martinez claim), Logtown, El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA School Girl and Union Mine (School Girl & Union; Springfield), Logtown, El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
| β Gold Formula: Au Localities: Reported from at least 47 localities in this region. Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
| β Muscovite Formula: KAl2(AlSi3O10)(OH)2 Localities: Martinez Gold Mine (Martinez Mine; Martinez Hillside group; Bismark claim; Gold reef claim; Hillside Extension claim; Hillside Extension No. 3 claim; Martinez claim), Logtown, El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA Martinez Mine (Martinez Gold Mine; Martinez claim; Bismarck claim; Gold Reef claim; Hillside Extension claim; Hillside Extension No. 3 claim; Martinez Hillside group; Hillside group), Logtown, El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA Description: Occurs as sericite schist. Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10095088. |
| β Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 Localities: Martinez Gold Mine (Martinez Mine; Martinez Hillside group; Bismark claim; Gold reef claim; Hillside Extension claim; Hillside Extension No. 3 claim; Martinez claim), Logtown, El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA Martinez Mine (Martinez Gold Mine; Martinez claim; Bismarck claim; Gold Reef claim; Hillside Extension claim; Hillside Extension No. 3 claim; Martinez Hillside group; Hillside group), Logtown, El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA Description: Occurs as sericite schist. Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10095088. |
| β 'Psilomelane' Localities: Martinez Mine (Martinez Gold Mine; Martinez claim; Bismarck claim; Gold Reef claim; Hillside Extension claim; Hillside Extension No. 3 claim; Martinez Hillside group; Hillside group), Logtown, El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA Martinez Gold Mine (Martinez Mine; Martinez Hillside group; Bismark claim; Gold reef claim; Hillside Extension claim; Hillside Extension No. 3 claim; Martinez claim), Logtown, El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
| β Pyrite Formula: FeS2 Localities: Reported from at least 7 localities in this region. Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
| β Pyrite var. Gold-bearing Pyrite Formula: FeS2 Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10310688. |
| β Pyrolusite Formula: Mn4+O2 Localities: Martinez Mine (Martinez Gold Mine; Martinez claim; Bismarck claim; Gold Reef claim; Hillside Extension claim; Hillside Extension No. 3 claim; Martinez Hillside group; Hillside group), Logtown, El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA Martinez Gold Mine (Martinez Mine; Martinez Hillside group; Bismark claim; Gold reef claim; Hillside Extension claim; Hillside Extension No. 3 claim; Martinez claim), Logtown, El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
| β Pyrrhotite Formula: Fe1-xS Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
| β Quartz Formula: SiO2 Localities: Reported from at least 44 localities in this region. Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
| β Rhodonite Formula: CaMn3Mn[Si5O15] Localities: Martinez Mine (Martinez Gold Mine; Martinez claim; Bismarck claim; Gold Reef claim; Hillside Extension claim; Hillside Extension No. 3 claim; Martinez Hillside group; Hillside group), Logtown, El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA Martinez Gold Mine (Martinez Mine; Martinez Hillside group; Bismark claim; Gold reef claim; Hillside Extension claim; Hillside Extension No. 3 claim; Martinez claim), Logtown, El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA Reference: Trask, Parker Davies, Ivan F. Wilson & F.S. Simons (1943), Manganese deposits of California β a summary report: California Division Mines Bulletin 125: 111; Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 52; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 321; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 411. |
| β Silver Formula: Ag Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
| β Sphalerite Formula: ZnS Reference: Emmons and Becker (1885) Statistics and Technology of the precious Metals. Census reports Tenth census. June 1, 1880, Volume 13 By United States. Census office. 10th census, 1880, United States. Census Office |
| β Talc Formula: Mg3Si4O10(OH)2 Description: Occurs as talcose schist in the vein. Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10030133. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| β | Gold | 1.AA.05 | Au |
| β | Silver | 1.AA.05 | Ag |
| Group 2 - Sulphides and Sulfosalts | |||
| β | Arsenopyrite | 2.EB.20 | FeAsS |
| β | Bornite | 2.BA.15 | Cu5FeS4 |
| β | Chalcopyrite | 2.CB.10a | CuFeS2 |
| β | Galena | 2.CD.10 | PbS |
| β | Pyrite | 2.EB.05a | FeS2 |
| β | var. Gold-bearing Pyrite | 2.EB.05a | FeS2 |
| β | Pyrrhotite | 2.CC.10 | Fe1-xS |
| β | Sphalerite | 2.CB.05a | ZnS |
| Group 4 - Oxides and Hydroxides | |||
| β | Pyrolusite | 4.DB.05 | Mn4+O2 |
| β | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| β | Calcite | 5.AB.05 | CaCO3 |
| Group 9 - Silicates | |||
| β | Diopside | 9.DA.15 | CaMgSi2O6 |
| β | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| β | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| β | Rhodonite | 9.DK.05 | CaMn3Mn[Si5O15] |
| β | Talc | 9.EC.05 | Mg3Si4O10(OH)2 |
| Unclassified Minerals, Rocks, etc. | |||
| β | 'Psilomelane' | - | |
List of minerals for each chemical element
References
Sort by
Year (asc) Year (desc) Author (A-Z) Author (Z-A)Lindgren, Waldemar (1894), Placerville folio: USGS Geological Atlas of the U.S., folio 3, 4 pp.
Storms, W. H. (1900), Church and Union mines: California Mining Bureau Bulletin 18: 91-92.
Tucker, W. B. (1919), El Dorado County, Church and Union mines: California Mining Bureau Report 15: 283, 299.
Logan, C. A. (1936), Mother Lode gold belt, Church and Martinez mines: California Division of Mines Bulletin 108: 21-22, 30-31.
Clark, W. B., and Carlson, D.W. (1956), EI Dorado County, lode gold mines: California Jour. Mines and Geology, vol. 52, pp. 401-429.
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.; [β¦(abstract): Jour. Geol.: 4: 248-250 (1896)].
Storms, William H. (1900), The Mother Lode region of California: Church and Union Mines, California Mining Bureau. Bulletin 18: 91-92.
Tucker, W. Burling & C.A. Waring (1919), El Dorado County: California Journal of Mines and Geology, California Mining Bureau. (Report 15): 15: 283, 299.
Logan, Clarence August (1935), Mother Lode Gold Belt of California: California, Church and Martinez Mines, Division Mines Bulletin 108, 221 pp.: 21-22, 30-31.
Clark, Wm. B. & D.W. Carlson (1956), Mines and mineral resources of El Dorado County, California: California Journal of Mines and Geology: 52(4): 401-429.
Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193: 45.
External Links
Localities in this Region
- California
- El Dorado Co.
- Mother Lode Belt
- El Dorado Mining District
- El Dorado (Mud Springs)
- Bullion Mine
- Crown Point Consolidated Mine (Gold Queen claim; Bald Eagle claim)
- Crusader Mine (Crusader claim; Alta claim; Gibralter claim)
- Falls Mine
- Gibraltor and Alta occurrence
- Jones Mine (Good Luck Mine)
- Lone Star Extension claim
- Lone Star Mine [1]
- Mathenas Creek Mine (Schneider)
- Oro Flem Mine (Oro Flam; Oriflamme)
- Relocated Eureka Mine
- San Leandro Mine
- Tennessee Creek placer
- Tullis Mine (Diamond)
- Unnamed Au mine [44]
- Unnamed Diopside occurrence [1]
- Unnamed placer Au mine [16] (dredge tailings)
- Logtown
- Adjuster Mine (Hustler claim; Adjuster claim)
- Alabama Express Mine (Golden Rod & Gold Dust Mine; Alabama; Empress; Goldenrod; Gd Dst [Gold Dust claim])
- Baker and Hamilton placer
- Bidstrup Mine
- Blue Cat Mine (Magdalena; Madelina; Madeline)
- Buena Vista Mine
- Church Mine
- Climax Mine
- Dan Wicham Mine
- Double E occurrence
- Dr. Wren occurrence
- Duncan and Adams Mine
- E. E. Copper Mine (E. E. Copper deposit)
- El Dorado (Mud Springs)
- El Dorado Mining District
- Mother Lode Belt
- El Dorado Co.
- California
- El Dorado Co.
- Mother Lode Belt
- El Dorado Mining District
- Logtown
- Equator Mine (Equetor)
- German Mine [1] (Haeger)
- Gold Top Mine
- Idaho Mine
- Julia Beard Mine
- La Moille Mine
- Lookout Mine (Santa Ynez; Sam Hill; Mohawk)
- Loveless Mine
- Lucky Jack Mine [1]
- Martinez Gold Mine (Martinez Mine; Martinez Hillside group; Bismark claim; Gold reef claim; Hillside Extension claim; Hillside Extension No. 3 claim; Martinez claim)
- Martinez Mine (Martinez Gold Mine; Martinez claim; Bismarck claim; Gold Reef claim; Hillside Extension claim; Hillside Extension No. 3 claim; Martinez Hillside group; Hillside group)
- McNulty Mine (Oakland; Golden Gate)
- Minerva Mine
- Minnehaha Mine
- Moonday prospect
- New Petaluma Mine
- Noonday Mine
- Ophir Mine
- Orum Mine (Woodland)
- Pocahontas Mine
- Red Rover Mine
- Red Wing Mine (Red Top)
- Richards Quartz Mine
- Richelieu Mine
- Robert prospect
- School Girl and Union Mine (School Girl & Union; Springfield)
- Seymour Hill Mine
- Spanish King Placer Mine
- St. Louis Mine
- Starlight and Independence Mine (Starlight Mine)
- Union Mine (Union-Church Mine; Springfield Mine)
- Unnamed Au mine [18] (Four unnamed adits)
- Wild Rose Consolidated Mine (Wild Rose Cons.; Old Abe claim; Lone Star claim; Wild Rose claim; Moon claim [?])
- Logtown
- El Dorado Mining District
- Mother Lode Belt
- El Dorado Co.
Other Regions, Features and Areas containing this locality
This page 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.
El Dorado Mining District, Mother Lode Belt, El Dorado Co., California, USA