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McLaughlin Mine (Manhattan Mine), Knoxville, Knoxville Mining District, Napa County, California, USAi
Regional Level Types
McLaughlin Mine (Manhattan Mine)Mine
Knoxville- not defined -
Knoxville Mining DistrictMining District
Napa CountyCounty
CaliforniaState
USACountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
38° 50' 17'' North , 122° 21' 50'' West
Latitude & Longitude (decimal):
Type:
Nearest Settlements:
PlacePopulationDistance
Guinda254 (2011)14.8km
Hidden Valley Lake5,579 (2011)17.2km
Lower Lake1,294 (2011)22.8km
Middletown1,323 (2011)23.7km
Clearlake15,182 (2017)26.3km
Mindat Locality ID:
15218
Long-form identifier:
mindat:1:2:15218:4
GUID (UUID V4):
d1a0b91a-caf4-4d11-a5b7-d2438e919e7b


A former open-cast Au-Ag-Pb-Hg-Sb occurrence/mine located in sec. 6, T11N, R4W, and in sec. 1, T11N, R5W, MDM, 2.4 km (7,900 feet) WNW of the Knoxville Mine. Discovered 1865. Worked 1863 - 1877, 1892 - 1905, 1916, 1927, 1932 - 1933, and 1936 - 1945. Some operations extended into Yolo and Lake counties.

The McLaughlin deposit is a large hot spring-type gold deposit located in the northern Coast Ranges of California at the faulted lithologic contact between the Coast Range ophiolite and the Great Valley sequence. The McLaughlin deposit is centered around the sheeted vein complex, a large multistage vein swarm, localized in a dilation zone formed by rheologic contrasts in the footwall polymictic melange. The surface expression of the sheeted vein complex is a subaerial sinter terrace, which merges into the sheeted vein complex. Metal zoning in the sheeted vein complex is highly telescoped. The sinter is enriched in mercury, whereas gold and silver are restricted to the upper 350 m. with the proportion of gold to silver decreasing with depth. Gold is typically present as electrum and is associated with silver and base metal-bearing sulfosalts. Below 350 m mineralization is dominated by small quartz veins with base metal sulfides.

Mineralization is a hydrothermal vein deposit. Host rock is aphanitic volcanic rock (tuff). The ore zone is irregular at 1609.3 meters (1 mile) long and 30.48 meters (several hundred yards ?) wide. The ore occurs as irregular veins of cinnabar filling joint cracks in Tertiary olivine basalt and is disseminated in the rocks adjoining the veins. Alteration is local: silicification of fault zones and tuff; bleaching and kaolinization of basalt. Volcanics are overlain by hot springs deposits.

Production: Ore ran more than 32-50 pounds/ton hand cobbed. Assay given as 18,520 grams/metric ton.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


26 valid minerals.

Rock Types Recorded

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

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Alunogen
Formula: Al2(SO4)3 · 17H2O
Colour: Yellow-white
Description: Occurs as micro-crystals on melanterite.
Ammonioalunite
Formula: (NH4)Al3(SO4)2(OH)6
Aragonite
Formula: CaCO3
Arsenopyrite
Formula: FeAsS
Baryte
Formula: BaSO4
Buddingtonite
Formula: (NH4)(AlSi3O8)
Calcite
Formula: CaCO3
Cinnabar
Formula: HgS
Gold
Formula: Au
Description: Dendritic.
Gold var. Electrum
Formula: (Au,Ag)
Jamesonite
Formula: Pb4FeSb6S14
Description: Occurs as delicate capillary crystals "feather ore" associated with cinnabar.
Kaolinite
Formula: Al2(Si2O5)(OH)4
Description: Alteration product of basalt.
'K Feldspar'
'K Feldspar var. Adularia'
Formula: KAlSi3O8
Marcasite
Formula: FeS2
Melanterite
Formula: Fe2+(H2O)6SO4 · H2O
Mercury
Formula: Hg
Metacinnabar
Formula: HgS
Miargyrite
Formula: AgSbS2
Montmorillonite
Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Montroydite
Formula: HgO
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
Opal
Formula: SiO2 · nH2O
Description: Brightly-colored, hydrocarbon-rich material.
Opal var. Lemon Opal
Formula: SiO2 · nH2O
Opal var. Precious Opal
Formula: SiO2 · nH2O
Pyrargyrite
Formula: Ag3SbS3
Pyrite
Formula: FeS2
References:
Pyrolusite
Formula: Mn4+O2
Description: Occurs as radiating concentric masses with cinnabar.
Quartz
Formula: SiO2
Quartz var. Chalcedony
Formula: SiO2
Description: Occurs as "frothy" veins with associated mineral crystals.
Quartz var. Myrickite
Formula: SiO2
Senarmontite
Formula: Sb2O3
Habit: Octahedral
Description: Occurs as micro-octahedra in vugs and fissures of chert.
Stibnite
Formula: Sb2S3
Description: Occurs as fibrous bands with cinnabar.

Gallery:

BaSO4 Baryte
SiO2 · nH2O Opal

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold
var. Electrum
1.AA.05(Au,Ag)
1.AA.05Au
Mercury1.AD.05Hg
Group 2 - Sulphides and Sulfosalts
Metacinnabar2.CB.05aHgS
Cinnabar2.CD.15aHgS
Stibnite2.DB.05Sb2S3
Pyrite2.EB.05aFeS2
Marcasite2.EB.10aFeS2
Arsenopyrite2.EB.20FeAsS
Pyrargyrite2.GA.05Ag3SbS3
Miargyrite2.HA.10AgSbS2
Jamesonite2.HB.15Pb4FeSb6S14
Group 4 - Oxides and Hydroxides
Montroydite4.AC.15HgO
Senarmontite4.CB.50Sb2O3
Quartz4.DA.05SiO2
var. Myrickite4.DA.05SiO2
var. Chalcedony4.DA.05SiO2
Opal
var. Lemon Opal
4.DA.10SiO2 · nH2O
var. Precious Opal4.DA.10SiO2 · nH2O
4.DA.10SiO2 · nH2O
Pyrolusite4.DB.05Mn4+O2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Aragonite5.AB.15CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
Ammonioalunite7.BC.10(NH4)Al3(SO4)2(OH)6
Melanterite7.CB.35Fe2+(H2O)6SO4 · H2O
Alunogen7.CB.45Al2(SO4)3 · 17H2O
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var. Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Montmorillonite9.EC.40(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Buddingtonite9.FA.30(NH4)(AlSi3O8)
Unclassified
'K Feldspar'-
'var. Adularia'-KAlSi3O8

List of minerals for each chemical element

HHydrogen
H AlunogenAl2(SO4)3 · 17H2O
H Ammonioalunite(NH4)Al3(SO4)2(OH)6
H Buddingtonite(NH4)(AlSi3O8)
H KaoliniteAl2(Si2O5)(OH)4
H MelanteriteFe2+(H2O)6SO4 · H2O
H MuscoviteKAl2(AlSi3O10)(OH)2
H Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
H OpalSiO2 · nH2O
H Opal var. Precious OpalSiO2 · nH2O
H Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
H Opal var. Lemon OpalSiO2 · nH2O
CCarbon
C AragoniteCaCO3
C CalciteCaCO3
NNitrogen
N Ammonioalunite(NH4)Al3(SO4)2(OH)6
N Buddingtonite(NH4)(AlSi3O8)
OOxygen
O K Feldspar var. AdulariaKAlSi3O8
O AlunogenAl2(SO4)3 · 17H2O
O Ammonioalunite(NH4)Al3(SO4)2(OH)6
O AragoniteCaCO3
O BaryteBaSO4
O Buddingtonite(NH4)(AlSi3O8)
O CalciteCaCO3
O Quartz var. ChalcedonySiO2
O KaoliniteAl2(Si2O5)(OH)4
O MelanteriteFe2+(H2O)6SO4 · H2O
O MontroyditeHgO
O MuscoviteKAl2(AlSi3O10)(OH)2
O Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
O OpalSiO2 · nH2O
O PyrolusiteMn4+O2
O QuartzSiO2
O SenarmontiteSb2O3
O Opal var. Precious OpalSiO2 · nH2O
O Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
O Opal var. Lemon OpalSiO2 · nH2O
O Quartz var. MyrickiteSiO2
NaSodium
Na Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
MgMagnesium
Mg Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
AlAluminium
Al K Feldspar var. AdulariaKAlSi3O8
Al AlunogenAl2(SO4)3 · 17H2O
Al Ammonioalunite(NH4)Al3(SO4)2(OH)6
Al Buddingtonite(NH4)(AlSi3O8)
Al KaoliniteAl2(Si2O5)(OH)4
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Al Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SiSilicon
Si K Feldspar var. AdulariaKAlSi3O8
Si Buddingtonite(NH4)(AlSi3O8)
Si Quartz var. ChalcedonySiO2
Si KaoliniteAl2(Si2O5)(OH)4
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Si OpalSiO2 · nH2O
Si QuartzSiO2
Si Opal var. Precious OpalSiO2 · nH2O
Si Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Si Opal var. Lemon OpalSiO2 · nH2O
Si Quartz var. MyrickiteSiO2
SSulfur
S AlunogenAl2(SO4)3 · 17H2O
S Ammonioalunite(NH4)Al3(SO4)2(OH)6
S ArsenopyriteFeAsS
S BaryteBaSO4
S CinnabarHgS
S JamesonitePb4FeSb6S14
S MarcasiteFeS2
S MelanteriteFe2+(H2O)6SO4 · H2O
S MetacinnabarHgS
S MiargyriteAgSbS2
S PyrargyriteAg3SbS3
S PyriteFeS2
S StibniteSb2S3
KPotassium
K K Feldspar var. AdulariaKAlSi3O8
K MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca AragoniteCaCO3
Ca CalciteCaCO3
Ca Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
MnManganese
Mn PyrolusiteMn4+O2
FeIron
Fe ArsenopyriteFeAsS
Fe JamesonitePb4FeSb6S14
Fe MarcasiteFeS2
Fe MelanteriteFe2+(H2O)6SO4 · H2O
Fe PyriteFeS2
AsArsenic
As ArsenopyriteFeAsS
AgSilver
Ag Gold var. Electrum(Au,Ag)
Ag MiargyriteAgSbS2
Ag PyrargyriteAg3SbS3
SbAntimony
Sb JamesonitePb4FeSb6S14
Sb MiargyriteAgSbS2
Sb PyrargyriteAg3SbS3
Sb SenarmontiteSb2O3
Sb StibniteSb2S3
BaBarium
Ba BaryteBaSO4
AuGold
Au Gold var. Electrum(Au,Ag)
Au GoldAu
HgMercury
Hg CinnabarHgS
Hg MercuryHg
Hg MetacinnabarHgS
Hg MontroyditeHgO
PbLead
Pb JamesonitePb4FeSb6S14

Other Databases

Link to USGS MRDS:10040777

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate

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

 
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