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Georgetown District, East Segment Mother Lode, El Dorado County, California, USAi
Regional Level Types
Georgetown DistrictMining District
East Segment Mother LodeLode
El Dorado CountyCounty
CaliforniaState
USACountry

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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
Mindat Locality ID:
69059
Long-form identifier:
mindat:1:2:69059:6
GUID (UUID V4):
0


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.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

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

29 valid minerals.

Rock Types Recorded


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

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Anatase
Formula: TiO2
Brookite
Formula: TiO2
Calcite
Formula: CaCO3
'Chlorite Group'
Chromite
Formula: Fe2+Cr3+2O4
Chrysotile
Formula: Mg3(Si2O5)(OH)4
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Clinochlore var. Chromium-bearing Clinochlore
Formula: Mg5(Al,Cr)2Si3O10(OH)8
Diopside
Formula: CaMgSi2O6
Colour: White
Description: Massive material and lath-like crystals to 7 mm wide; resembles vesuvianite.
Enargite
Formula: Cu3AsS4
Galena
Formula: PbS
Graphite
Formula: C
Grossular
Formula: Ca3Al2(SiO4)3
Habit: trapezohedral
Colour: Pure white
Fluorescence: Bright pink-orange in LW
Description: Occurs in veinlets in serpentine.
Hessite
Formula: Ag2Te
Description: A float specimen was found in 1854.
Ilmenite
Formula: Fe2+TiO3
Description: Occurs in placer sands including as beautiful and complex crystals with brilliant faces to 1 inch (2.5 cm) diameter.
'Limonite'
Description: Occurs as an alteration product of nontronite.
Margarite
Formula: CaAl2(Al2Si2O10)(OH)2
Description: Occurs in graphitic metapelites as pseudomorphic replacements of chiastolite.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
Description: Occurs as sericite schist surrounding fine-grained chert.
Native Copper
Formula: Cu
Description: Occurs in siliceous shales.
Native Gold
Formula: Au
Localities: Reported from at least 37 localities in this region.
Nontronite
Formula: Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Description: Occurs altered/altering to limonite.
Opal
Formula: SiO2 · nH2O
Paragonite
Formula: NaAl2(AlSi3O10)(OH)2
Description: Occurs in graphitic metapelites.
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Description: Occurs in veinlets.
'Psilomelane'
Pyrite
Formula: FeS2
Habit: Cubic
Description: Occurs as brilliant cubes.
Pyrite var. Gold-bearing Pyrite
Formula: FeS2
Pyrolusite
Formula: Mn4+O2
Quartz
Formula: SiO2
Localities: Reported from at least 29 localities in this region.
Quartz var. Smoky Quartz
Formula: SiO2
References:
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4
'Serpentine Subgroup var. Picrolite'
Formula: D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Tremolite
Formula: ◻Ca2Mg5(Si8O22)(OH)2
Uvarovite
Formula: Ca3Cr3+2(SiO4)3
Vesuvianite
Formula: Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
Colour: Brown
Description: Occurs as crystals.
Wulfenite
Formula: Pb(MoO4)
Description: Occurs as small grains.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Native Copper1.AA.05Cu
Native Gold1.AA.05Au
Graphite1.CB.05aC
Group 2 - Sulphides and Sulfosalts
Hessite2.BA.60Ag2Te
Galena2.CD.10PbS
Pyrite
var. Gold-bearing Pyrite
2.EB.05aFeS2
2.EB.05aFeS2
Enargite2.KA.05Cu3AsS4
Group 4 - Oxides and Hydroxides
Chromite4.BB.05Fe2+Cr3+2O4
Ilmenite4.CB.05Fe2+TiO3
Quartz4.DA.05SiO2
var. Smoky Quartz4.DA.05SiO2
Opal4.DA.10SiO2 · nH2O
Pyrolusite4.DB.05Mn4+O2
Anatase4.DD.05TiO2
Brookite4.DD.10TiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Wulfenite7.GA.05Pb(MoO4)
Group 9 - Silicates
Chrysotile9.00.Mg3(Si2O5)(OH)4
Grossular9.AD.25Ca3Al2(SiO4)3
Uvarovite9.AD.25Ca3Cr3+2(SiO4)3
Vesuvianite9.BG.35Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
Diopside9.DA.15CaMgSi2O6
Tremolite9.DE.10◻Ca2Mg5(Si8O22)(OH)2
Prehnite9.DP.20Ca2Al2Si3O10(OH)2
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Paragonite9.EC.15NaAl2(AlSi3O10)(OH)2
Muscovite
var. Sericite
9.EC.15KAl2(AlSi3O10)(OH)2
Margarite9.EC.30CaAl2(Al2Si2O10)(OH)2
Nontronite9.EC.40Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
var. Chromium-bearing Clinochlore9.EC.55Mg5(Al,Cr)2Si3O10(OH)8
Albite9.FA.35Na(AlSi3O8)
Unclassified
'Chlorite Group'-
'Limonite'-
'Psilomelane'-
'Serpentine Subgroup'-D3[Si2O5](OH)4
'var. Picrolite'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H ChrysotileMg3(Si2O5)(OH)4
H ClinochloreMg5Al(AlSi3O10)(OH)8
H Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
H MargariteCaAl2(Al2Si2O10)(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
H NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
H OpalSiO2 · nH2O
H ParagoniteNaAl2(AlSi3O10)(OH)2
H PrehniteCa2Al2Si3O10(OH)2
H Tremolite◻Ca2Mg5(Si8O22)(OH)2
H VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
H Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
H Serpentine SubgroupD3[Si2O5](OH)4
H Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
CCarbon
C CalciteCaCO3
C GraphiteC
OOxygen
O AlbiteNa(AlSi3O8)
O AnataseTiO2
O BrookiteTiO2
O CalciteCaCO3
O ChrysotileMg3(Si2O5)(OH)4
O ChromiteFe2+Cr23+O4
O ClinochloreMg5Al(AlSi3O10)(OH)8
O DiopsideCaMgSi2O6
O GrossularCa3Al2(SiO4)3
O IlmeniteFe2+TiO3
O Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
O MargariteCaAl2(Al2Si2O10)(OH)2
O MuscoviteKAl2(AlSi3O10)(OH)2
O NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
O OpalSiO2 · nH2O
O ParagoniteNaAl2(AlSi3O10)(OH)2
O PrehniteCa2Al2Si3O10(OH)2
O PyrolusiteMn4+O2
O QuartzSiO2
O Quartz var. Smoky QuartzSiO2
O Tremolite◻Ca2Mg5(Si8O22)(OH)2
O UvaroviteCa3Cr23+(SiO4)3
O VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
O WulfenitePb(MoO4)
O Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
O Serpentine SubgroupD3[Si2O5](OH)4
O Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
NaSodium
Na AlbiteNa(AlSi3O8)
Na NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Na ParagoniteNaAl2(AlSi3O10)(OH)2
MgMagnesium
Mg ChrysotileMg3(Si2O5)(OH)4
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
Mg DiopsideCaMgSi2O6
Mg Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
Mg Tremolite◻Ca2Mg5(Si8O22)(OH)2
Mg VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
Mg Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
AlAluminium
Al AlbiteNa(AlSi3O8)
Al ClinochloreMg5Al(AlSi3O10)(OH)8
Al GrossularCa3Al2(SiO4)3
Al Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
Al MargariteCaAl2(Al2Si2O10)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Al ParagoniteNaAl2(AlSi3O10)(OH)2
Al PrehniteCa2Al2Si3O10(OH)2
Al VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
Al Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Al Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
SiSilicon
Si AlbiteNa(AlSi3O8)
Si ChrysotileMg3(Si2O5)(OH)4
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si DiopsideCaMgSi2O6
Si GrossularCa3Al2(SiO4)3
Si Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
Si MargariteCaAl2(Al2Si2O10)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Si OpalSiO2 · nH2O
Si ParagoniteNaAl2(AlSi3O10)(OH)2
Si PrehniteCa2Al2Si3O10(OH)2
Si QuartzSiO2
Si Quartz var. Smoky QuartzSiO2
Si Tremolite◻Ca2Mg5(Si8O22)(OH)2
Si UvaroviteCa3Cr23+(SiO4)3
Si VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
Si Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Si Serpentine SubgroupD3[Si2O5](OH)4
Si Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
SSulfur
S Pyrite var. Gold-bearing PyriteFeS2
S EnargiteCu3AsS4
S GalenaPbS
S PyriteFeS2
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca CalciteCaCO3
Ca DiopsideCaMgSi2O6
Ca GrossularCa3Al2(SiO4)3
Ca MargariteCaAl2(Al2Si2O10)(OH)2
Ca PrehniteCa2Al2Si3O10(OH)2
Ca Tremolite◻Ca2Mg5(Si8O22)(OH)2
Ca UvaroviteCa3Cr23+(SiO4)3
Ca VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
TiTitanium
Ti AnataseTiO2
Ti BrookiteTiO2
Ti IlmeniteFe2+TiO3
CrChromium
Cr ChromiteFe2+Cr23+O4
Cr Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
Cr UvaroviteCa3Cr23+(SiO4)3
MnManganese
Mn PyrolusiteMn4+O2
Mn Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe Pyrite var. Gold-bearing PyriteFeS2
Fe ChromiteFe2+Cr23+O4
Fe IlmeniteFe2+TiO3
Fe NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Fe PyriteFeS2
Fe VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
Fe Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
NiNickel
Ni Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
CuCopper
Cu Native CopperCu
Cu EnargiteCu3AsS4
ZnZinc
Zn Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
AsArsenic
As EnargiteCu3AsS4
MoMolybdenum
Mo WulfenitePb(MoO4)
AgSilver
Ag HessiteAg2Te
TeTellurium
Te HessiteAg2Te
AuGold
Au Native GoldAu
PbLead
Pb GalenaPbS
Pb WulfenitePb(MoO4)

Localities in this Region

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate
USA

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