Georgetown District, East Segment Mother Lode, El Dorado County, California, USAi
Regional Level Types | |
---|---|
Georgetown District | Mining District |
East Segment Mother Lode | Lode |
El Dorado County | County |
California | State |
USA | Country |
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Latitude & Longitude (WGS84):
38° North , 120° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~58km
Type:
KΓΆppen climate type:
Mindat Locality ID:
69059
Long-form identifier:
mindat:1:2:69059:6
GUID (UUID V4):
e7e51ee1-7716-4297-8d51-0f31120ffd3a
Location
The Georgetown district is in northwestern El Dorado County at the north end of the northeast segment of the Mother Lode belt. It extends from just north of Garden Valley north through Georgetown and the Georgia Slide area to the Middle Fork of the American River. It is both a lode- and placer-mining district.
History
Mining began here in 1849 by a party of placer miners from Oregon. The site was first known as Growlersburg, but was soon changed to Georgetown. It is reported to have been named for either George Ehrenhaft, who laid out the town, or George Phipps, a sailor-prospector. The placers were highly productive during the 1850s. The seam deposits at Georgia Slide were mined on a large scale by hydraulicking from 1853 to about 1895. There was some activIty during the early 1900s, and in the 1930s the Beebe and Alpine mines were worked on a fairly large scale. There has been minor prospecting and skin diving in the district since.
Geology
This district is in the northern end of the Mother Lode gold belt (see fig. 4). There is a two-mile wide north- and northwest-trending belt of Mariposa slate (Upper Jurassic) in the central portion of the district, with greenstone and green schist to the west and mica schist, slate, quartzite, amphibolite, and serpentine to the east. In places, especially at Georgia Slide, the bedrock is deeply weathered. Several patches of Tertiary gravel overlain by andesite are exposed on some hills in the northern part.
Ore Deposits
The ore deposits consist of thick zonettf mineralized schist and slate that contain numerous quartz veins and veinlets. Where deeply weathered the gold became concentrated and such deposits were worked by placer-mining methods. These are known as "seam" deposits. Below the weathered zone they were mined as lode deposits. The seam deposit at Georgia Slide was 1000 feet long and 500 feet wide. Usually the milling ore yielded from 1/7 to 1/5 ounce to the ton, but many high-grade pockets were encountered. In addition, there are several wide quartz veins containing finely disseminated free gold and pyrite. These veins contained ore shoots with stoping lengths of up to 500 feet. The Tertiary gravel patches have yielded gold.
MinesLode-seam: Alpine ($500,000+), Alma, Barney, Beebe ($2 million), California Jack, Cove Hill, Georgia Slide ($6 million), Mamaluke, Mount Hope.
Placer: Anderson, Bottle Hill, Cary, Cement Hill, Holmes, Jones Hill, Little Chief, Mulvey Point, Patterson, Rowe, Shoemaker, Tanksley, Trimble.
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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-localities29 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 DiagramDetailed Mineral List:
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
β | Copper | 1.AA.05 | Cu |
β | Gold | 1.AA.05 | Au |
β | Graphite | 1.CB.05a | C |
Group 2 - Sulphides and Sulfosalts | |||
β | Hessite | 2.BA.60 | Ag2Te |
β | Galena | 2.CD.10 | PbS |
β | Pyrite | 2.EB.05a | FeS2 |
β | var. Gold-bearing Pyrite | 2.EB.05a | FeS2 |
β | Enargite | 2.KA.05 | Cu3AsS4 |
Group 4 - Oxides and Hydroxides | |||
β | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
β | Ilmenite | 4.CB.05 | Fe2+TiO3 |
β | Quartz | 4.DA.05 | SiO2 |
β | var. Smoky Quartz | 4.DA.05 | SiO2 |
β | Opal | 4.DA.10 | SiO2 Β· nH2O |
β | Pyrolusite | 4.DB.05 | Mn4+O2 |
β | Anatase | 4.DD.05 | TiO2 |
β | Brookite | 4.DD.10 | TiO2 |
Group 5 - Nitrates and Carbonates | |||
β | Calcite | 5.AB.05 | CaCO3 |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
β | Wulfenite | 7.GA.05 | Pb(MoO4) |
Group 9 - Silicates | |||
β | Chrysotile | 9.. | Mg3(Si2O5)(OH)4 |
β | Uvarovite | 9.AD.25 | Ca3Cr2(SiO4)3 |
β | Grossular | 9.AD.25 | Ca3Al2(SiO4)3 |
β | Vesuvianite | 9.BG.35 | Ca19Fe3+Al4(Al6Mg2)(β»4)β»[Si2O7]4[(SiO4)10]O(OH)9 |
β | Diopside | 9.DA.15 | CaMgSi2O6 |
β | Tremolite | 9.DE.10 | β»Ca2Mg5(Si8O22)(OH)2 |
β | Prehnite | 9.DP.20 | Ca2Al2Si3O10(OH)2 |
β | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
β | Paragonite | 9.EC.15 | NaAl2(AlSi3O10)(OH)2 |
β | Muscovite var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
β | Margarite | 9.EC.30 | CaAl2(Al2Si2O10)(OH)2 |
β | Nontronite | 9.EC.40 | Na0.3Fe2((Si,Al)4O10)(OH)2 Β· nH2O |
β | Clinochlore var. Chromium-bearing Clinochlore | 9.EC.55 | Mg5(Al,Cr)2Si3O10(OH)8 |
β | 9.EC.55 | Mg5Al(AlSi3O10)(OH)8 | |
β | Albite | 9.FA.35 | Na(AlSi3O8) |
Unclassified | |||
β | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
β | 'Limonite' | - | |
β | 'Psilomelane' | - | |
β | 'Chlorite Group' | - | |
β | 'Serpentine Subgroup var. Picrolite' | - | D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Chrysotile | Mg3(Si2O5)(OH)4 |
H | β Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
H | β Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
H | β Margarite | CaAl2(Al2Si2O10)(OH)2 |
H | β Muscovite | KAl2(AlSi3O10)(OH)2 |
H | β Nontronite | Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O |
H | β Opal | SiO2 · nH2O |
H | β Paragonite | NaAl2(AlSi3O10)(OH)2 |
H | β Prehnite | Ca2Al2Si3O10(OH)2 |
H | β Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
H | β Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
H | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
H | β Serpentine Subgroup | D3[Si2O5](OH)4 |
H | β Serpentine Subgroup var. Picrolite | D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn |
C | Carbon | |
C | β Calcite | CaCO3 |
C | β Graphite | C |
O | Oxygen | |
O | β Albite | Na(AlSi3O8) |
O | β Anatase | TiO2 |
O | β Brookite | TiO2 |
O | β Calcite | CaCO3 |
O | β Chrysotile | Mg3(Si2O5)(OH)4 |
O | β Chromite | Fe2+Cr23+O4 |
O | β Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
O | β Diopside | CaMgSi2O6 |
O | β Grossular | Ca3Al2(SiO4)3 |
O | β Ilmenite | Fe2+TiO3 |
O | β Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
O | β Margarite | CaAl2(Al2Si2O10)(OH)2 |
O | β Muscovite | KAl2(AlSi3O10)(OH)2 |
O | β Nontronite | Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O |
O | β Opal | SiO2 · nH2O |
O | β Paragonite | NaAl2(AlSi3O10)(OH)2 |
O | β Prehnite | Ca2Al2Si3O10(OH)2 |
O | β Pyrolusite | Mn4+O2 |
O | β Quartz | SiO2 |
O | β Quartz var. Smoky Quartz | SiO2 |
O | β Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
O | β Uvarovite | Ca3Cr2(SiO4)3 |
O | β Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
O | β Wulfenite | Pb(MoO4) |
O | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
O | β Serpentine Subgroup | D3[Si2O5](OH)4 |
O | β Serpentine Subgroup var. Picrolite | D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn |
Na | Sodium | |
Na | β Albite | Na(AlSi3O8) |
Na | β Nontronite | Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O |
Na | β Paragonite | NaAl2(AlSi3O10)(OH)2 |
Mg | Magnesium | |
Mg | β Chrysotile | Mg3(Si2O5)(OH)4 |
Mg | β Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
Mg | β Diopside | CaMgSi2O6 |
Mg | β Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
Mg | β Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
Mg | β Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
Mg | β Serpentine Subgroup var. Picrolite | D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn |
Al | Aluminium | |
Al | β Albite | Na(AlSi3O8) |
Al | β Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
Al | β Grossular | Ca3Al2(SiO4)3 |
Al | β Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
Al | β Margarite | CaAl2(Al2Si2O10)(OH)2 |
Al | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Al | β Nontronite | Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O |
Al | β Paragonite | NaAl2(AlSi3O10)(OH)2 |
Al | β Prehnite | Ca2Al2Si3O10(OH)2 |
Al | β Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
Al | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Al | β Serpentine Subgroup var. Picrolite | D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn |
Si | Silicon | |
Si | β Albite | Na(AlSi3O8) |
Si | β Chrysotile | Mg3(Si2O5)(OH)4 |
Si | β Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
Si | β Diopside | CaMgSi2O6 |
Si | β Grossular | Ca3Al2(SiO4)3 |
Si | β Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
Si | β Margarite | CaAl2(Al2Si2O10)(OH)2 |
Si | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Si | β Nontronite | Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O |
Si | β Opal | SiO2 · nH2O |
Si | β Paragonite | NaAl2(AlSi3O10)(OH)2 |
Si | β Prehnite | Ca2Al2Si3O10(OH)2 |
Si | β Quartz | SiO2 |
Si | β Quartz var. Smoky Quartz | SiO2 |
Si | β Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
Si | β Uvarovite | Ca3Cr2(SiO4)3 |
Si | β Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
Si | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Si | β Serpentine Subgroup | D3[Si2O5](OH)4 |
Si | β Serpentine Subgroup var. Picrolite | D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn |
S | Sulfur | |
S | β Pyrite var. Gold-bearing Pyrite | FeS2 |
S | β Enargite | Cu3AsS4 |
S | β Galena | PbS |
S | β Pyrite | FeS2 |
K | Potassium | |
K | β Muscovite | KAl2(AlSi3O10)(OH)2 |
K | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Ca | Calcium | |
Ca | β Calcite | CaCO3 |
Ca | β Diopside | CaMgSi2O6 |
Ca | β Grossular | Ca3Al2(SiO4)3 |
Ca | β Margarite | CaAl2(Al2Si2O10)(OH)2 |
Ca | β Prehnite | Ca2Al2Si3O10(OH)2 |
Ca | β Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
Ca | β Uvarovite | Ca3Cr2(SiO4)3 |
Ca | β Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
Ti | Titanium | |
Ti | β Anatase | TiO2 |
Ti | β Brookite | TiO2 |
Ti | β Ilmenite | Fe2+TiO3 |
Cr | Chromium | |
Cr | β Chromite | Fe2+Cr23+O4 |
Cr | β Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
Cr | β Uvarovite | Ca3Cr2(SiO4)3 |
Mn | Manganese | |
Mn | β Pyrolusite | Mn4+O2 |
Mn | β Serpentine Subgroup var. Picrolite | D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn |
Fe | Iron | |
Fe | β Pyrite var. Gold-bearing Pyrite | FeS2 |
Fe | β Chromite | Fe2+Cr23+O4 |
Fe | β Ilmenite | Fe2+TiO3 |
Fe | β Nontronite | Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O |
Fe | β Pyrite | FeS2 |
Fe | β Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
Fe | β Serpentine Subgroup var. Picrolite | D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn |
Ni | Nickel | |
Ni | β Serpentine Subgroup var. Picrolite | D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn |
Cu | Copper | |
Cu | β Copper | Cu |
Cu | β Enargite | Cu3AsS4 |
Zn | Zinc | |
Zn | β Serpentine Subgroup var. Picrolite | D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn |
As | Arsenic | |
As | β Enargite | Cu3AsS4 |
Mo | Molybdenum | |
Mo | β Wulfenite | Pb(MoO4) |
Ag | Silver | |
Ag | β Hessite | Ag2Te |
Te | Tellurium | |
Te | β Hessite | Ag2Te |
Au | Gold | |
Au | β Gold | Au |
Pb | Lead | |
Pb | β Galena | PbS |
Pb | β Wulfenite | Pb(MoO4) |
Localities in this Region
- California
- El Dorado County
- East Segment Mother Lode
- Georgetown District
- Buckeye
- Fornis
- Alma Mine (Almo Mine)
- Alpine Mine (Union Consolidated Mine; Alpine Gold Mining Co.)
- Barney Mine
- California Jack Mine
- California Mine [1]
- Cranes Gulch Mine (Whitesides Mine)
- Eagle placer [1]
- Empire placer
- Lillian Lucero Nos. 1 and 2
- Manhattan Placer Mine
- Mount Hope Mine [1] (Mt. Hope Mine)
- Unnamed Au mine [4]
- Wilson Mine
- ⭔Garden Valley Area East
- Georgetown
- Anderson Placer Mine
- Barklage and Miller Mine
- Beebe Mine (Iowa claim; Woodside-Eureka claim; Brooklyn claim; East Lode claim)
- Black Oak Mine [2] (Black Oak deposit; Cassiorina Mine; Cassiorini Mine)
- Bottle Hill placer
- Bright Hope Mine
- Buffalo Bill deposit
- Cement Hill placer prospect
- Copper Chief Mine
- Cove Hill Mine
- David prospect
- David W. Cary placer (Cary placer)
- Elmira Placer Mine
- Esperanza Mine (Esperanza claim; Garden Valley claim)
- Eureka Mine [1]
- Ford Mines
- Georgetown area occurrences
- Georgia Slide Mine (Beattie and Parsons Consonsolidated Mine; Beattie and Parsons Cons.; Beattie claim; Blue Rock claim; Mulvey Point claim; Pacific claim; Parsons claim)
- Henser Mine
- Holmes placer
- Jones Hill placer
- Knight Dredge Mine (Knight Dredge)
- Georgetown District
- East Segment Mother Lode
- El Dorado County
- California
- El Dorado County
- East Segment Mother Lode
- Georgetown District
- Georgetown
- Little Chief Mine
- Mameluke Hill Mine (Mameluke Mine)
- Morning Star group (Morning Star claim; Lucky Boy claim; Evening Star claim; Lucky Girl claim)
- Mulvey Point placer (Mulvy Point)
- Noble placer
- Patterson Hill placer (Patterson)
- Rock Canyon
- Shoemaker placer
- Siegel lode
- Swift and Bennett Mine
- Tanksley placer (Tankaley placer)
- Trimble placer
- Unnamed Asbestos occurrence [1]
- Unnamed Au occurrence [5]
- Unnamed Ti occurrence [1]
- Unspecified Cu occurrence [2]
- Wageman occurrence (Wagemann)
- Georgia Slide
- Blasdel Mine
- Blue Rock Mine (Blue Rock claim)
- Brown & Thompson placer
- Gallagher Mine
- Gold Bug placer (Gold Bug Canyon Creek)
- Le Bouf and England occurrence
- Lincoln Mine [1]
- Lincoln Mine [2]
- Pacific Mine
- Plattsburg Mine
- Rau & Patterson placer (Rau claim; Rowe claim; Patterson claim)
- Sailor Slide placer
- Stanton Placer Mine
- Uncle Sam Mine [1]
- Van Mine (Vann Mine)
- W. W. Mine
- Waukeshau Placer Mine
- Weske Mine
- Meadow Brook
- Georgetown
- Georgetown District
- East Segment Mother Lode
- El Dorado County
Other Regions, Features and Areas containing this locality
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Georgetown area occurrences, Georgetown, Georgetown District, East Segment Mother Lode, El Dorado County, California, USA