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Middletown, East Mayacmas Mining District, Lake County, California, USAi
Regional Level Types
Middletown- not defined -
East Mayacmas Mining DistrictMining District
Lake CountyCounty
CaliforniaState
USACountry

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Latitude & Longitude (WGS84):
38° 45' 9'' North , 122° 36' 50'' West
Latitude & Longitude (decimal):
38.75250,-122.61389
GeoHash:
G#: 9qbu3yem9
GRN:
N26W69
KΓΆppen climate type:
Csb : Warm-summer Mediterranean climate
Nearest Settlements:
PlacePopulationDistance
Middletown1,323 (2011)0.1km
Hidden Valley Lake5,579 (2011)7.8km
Cobb1,778 (2011)12.2km
Lower Lake1,294 (2011)17.6km
Calistoga5,330 (2017)19.5km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Santa Rosa Mineral And Gem Society, Inc.Santa Rosa, California36km
Mindat Locality ID:
80849
Long-form identifier:
mindat:1:2:80849:6
GUID (UUID V4):
ae5b9ad6-f3b4-4acc-8dda-bdf9cce7a299


A Hg mining area.

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

21 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

β“˜ Anorthite
Formula: Ca(Al2Si2O8)
Description: Occus as fine cleavage fragments.
β“˜ Azurite
Formula: Cu3(CO3)2(OH)2
β“˜ Calcite
Formula: CaCO3
β“˜ Chalcocite
Formula: Cu2S
β“˜ Chalcopyrite
Formula: CuFeS2
Description: Occurs as high-grade ore.
β“˜ Chromite
Formula: Fe2+Cr3+2O4
Localities: Reported from at least 6 localities in this region.
β“˜ Chrysotile
Formula: Mg3(Si2O5)(OH)4
Description: Occurs in serpentine.
β“˜ Cinnabar
Formula: HgS
Localities: Reported from at least 7 localities in this region.
β“˜ Dolomite
Formula: CaMg(CO3)2
Description: Occurs well-crystallized as gangue in Hg ores.
β“˜ Idrialite
Formula: C22H14
β“˜ Jamesonite
Formula: Pb4FeSb6S14
Description: A minor mineral here.
β“˜ Malachite
Formula: Cu2(CO3)(OH)2
β“˜ Mercury
Formula: Hg
β“˜ Metacinnabar
Formula: HgS
β“˜ Millerite
Formula: NiS
Description: Occurs in very small amounts.
β“˜ Opal
Formula: SiO2 · nH2O
β“˜ Pectolite
Formula: NaCa2Si3O8(OH)
Description: Occurs as extensive veins of fibrous material with calcite in serpentine.
β“˜ 'Psilomelane'
β“˜ Pyrite
Formula: FeS2
β“˜ Quartz
Formula: SiO2
β“˜ 'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4
β“˜ Tiemannite
Formula: HgSe
β“˜ Wollastonite
Formula: Ca3(Si3O9)
Colour: White
Description: Material is drusy.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
β“˜Mercury1.AD.05Hg
Group 2 - Sulphides and Sulfosalts
β“˜Chalcocite2.BA.05Cu2S
β“˜Tiemannite2.CB.05aHgSe
β“˜Metacinnabar2.CB.05aHgS
β“˜Chalcopyrite2.CB.10aCuFeS2
β“˜Millerite2.CC.20NiS
β“˜Cinnabar2.CD.15aHgS
β“˜Pyrite2.EB.05aFeS2
β“˜Jamesonite2.HB.15Pb4FeSb6S14
Group 4 - Oxides and Hydroxides
β“˜Chromite4.BB.05Fe2+Cr3+2O4
β“˜Quartz4.DA.05SiO2
β“˜Opal4.DA.10SiO2 Β· nH2O
Group 5 - Nitrates and Carbonates
β“˜Calcite5.AB.05CaCO3
β“˜Dolomite5.AB.10CaMg(CO3)2
β“˜Azurite5.BA.05Cu3(CO3)2(OH)2
β“˜Malachite5.BA.10Cu2(CO3)(OH)2
Group 9 - Silicates
β“˜Chrysotile9..Mg3(Si2O5)(OH)4
β“˜Pectolite9.DG.05NaCa2Si3O8(OH)
β“˜Wollastonite9.DG.05Ca3(Si3O9)
β“˜Anorthite9.FA.35Ca(Al2Si2O8)
Group 10 - Organic Compounds
β“˜Idrialite10.BA.20C22H14
Unclassified
β“˜'Psilomelane'-
β“˜'Serpentine Subgroup'-D3[Si2O5](OH)4

List of minerals for each chemical element

HHydrogen
Hβ“˜ AzuriteCu3(CO3)2(OH)2
Hβ“˜ ChrysotileMg3(Si2O5)(OH)4
Hβ“˜ IdrialiteC22H14
Hβ“˜ MalachiteCu2(CO3)(OH)2
Hβ“˜ OpalSiO2 · nH2O
Hβ“˜ PectoliteNaCa2Si3O8(OH)
Hβ“˜ Serpentine SubgroupD3[Si2O5](OH)4
CCarbon
Cβ“˜ AzuriteCu3(CO3)2(OH)2
Cβ“˜ CalciteCaCO3
Cβ“˜ DolomiteCaMg(CO3)2
Cβ“˜ IdrialiteC22H14
Cβ“˜ MalachiteCu2(CO3)(OH)2
OOxygen
Oβ“˜ AnorthiteCa(Al2Si2O8)
Oβ“˜ AzuriteCu3(CO3)2(OH)2
Oβ“˜ CalciteCaCO3
Oβ“˜ ChrysotileMg3(Si2O5)(OH)4
Oβ“˜ ChromiteFe2+Cr23+O4
Oβ“˜ DolomiteCaMg(CO3)2
Oβ“˜ MalachiteCu2(CO3)(OH)2
Oβ“˜ OpalSiO2 · nH2O
Oβ“˜ PectoliteNaCa2Si3O8(OH)
Oβ“˜ QuartzSiO2
Oβ“˜ WollastoniteCa3(Si3O9)
Oβ“˜ Serpentine SubgroupD3[Si2O5](OH)4
NaSodium
Naβ“˜ PectoliteNaCa2Si3O8(OH)
MgMagnesium
Mgβ“˜ ChrysotileMg3(Si2O5)(OH)4
Mgβ“˜ DolomiteCaMg(CO3)2
AlAluminium
Alβ“˜ AnorthiteCa(Al2Si2O8)
SiSilicon
Siβ“˜ AnorthiteCa(Al2Si2O8)
Siβ“˜ ChrysotileMg3(Si2O5)(OH)4
Siβ“˜ OpalSiO2 · nH2O
Siβ“˜ PectoliteNaCa2Si3O8(OH)
Siβ“˜ QuartzSiO2
Siβ“˜ WollastoniteCa3(Si3O9)
Siβ“˜ Serpentine SubgroupD3[Si2O5](OH)4
SSulfur
Sβ“˜ ChalcopyriteCuFeS2
Sβ“˜ ChalcociteCu2S
Sβ“˜ CinnabarHgS
Sβ“˜ JamesonitePb4FeSb6S14
Sβ“˜ MetacinnabarHgS
Sβ“˜ MilleriteNiS
Sβ“˜ PyriteFeS2
CaCalcium
Caβ“˜ AnorthiteCa(Al2Si2O8)
Caβ“˜ CalciteCaCO3
Caβ“˜ DolomiteCaMg(CO3)2
Caβ“˜ PectoliteNaCa2Si3O8(OH)
Caβ“˜ WollastoniteCa3(Si3O9)
CrChromium
Crβ“˜ ChromiteFe2+Cr23+O4
FeIron
Feβ“˜ ChalcopyriteCuFeS2
Feβ“˜ ChromiteFe2+Cr23+O4
Feβ“˜ JamesonitePb4FeSb6S14
Feβ“˜ PyriteFeS2
NiNickel
Niβ“˜ MilleriteNiS
CuCopper
Cuβ“˜ AzuriteCu3(CO3)2(OH)2
Cuβ“˜ ChalcopyriteCuFeS2
Cuβ“˜ ChalcociteCu2S
Cuβ“˜ MalachiteCu2(CO3)(OH)2
SeSelenium
Seβ“˜ TiemanniteHgSe
SbAntimony
Sbβ“˜ JamesonitePb4FeSb6S14
HgMercury
Hgβ“˜ CinnabarHgS
Hgβ“˜ MercuryHg
Hgβ“˜ MetacinnabarHgS
Hgβ“˜ TiemanniteHgSe
PbLead
Pbβ“˜ JamesonitePb4FeSb6S14

Localities in this Region

USA
USA

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate
USA

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.

References

Bradley, W.W. (1918), Quicksilver resources of California, with a section on metallurgy and ore dressing: California Mining Bureau. Bulletin 78, 389 pp.
Ransome, Alfred Leslie & J.L. Kellogg (1939), Quicksilver resources of California: California Division Mines Report 35: 353-558.
Holmes, G.H. (1965) Mercury in California. US Bureau of Mines Information Circular 8252: 87-206.
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