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Magnolia Mining District, Boulder Co., Colorado, USAi
Regional Level Types
Magnolia Mining DistrictMining District
Boulder Co.County
ColoradoState
USACountry

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Key
Latitude & Longitude (WGS84):
40° North , 105° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~34km
Locality type:


The Magnolia mining district lies, about 5 miles due west of Boulder and about a mile south of Middle Boulder Creek. The district is about 1,400 feet above the valley bottom.

Most of the productive veins crop out in an area of less than a square mile and the outcrops range in altitude from approximately 7,000 feet at the Graphic vein to about 7,700 feet at the Kekionga shaft a mile to the southwest.

Gold-telluride ore was found on the Magnolia vein in 1875 and during the next 2 years nearly all the veins now known in the district were discovered. Because of the high tenor of the ore and its erratic distribution in rich pockets, company mining and milling by absentee landlords has seldom been successful, and the district does not have a large output on record.

All the ore deposits in the Magnolia district are fissure fillings; mineralization has been chiefly of the gold-tel1urille type but some tungsten ore has been mined. Gangue minerals are present in only minor quantity and consist of little but light-colored to dark-colored varieties of extremely fine grained quartz "horn".

The district is noted for the variety of telluride minerals found and for the unusual association of gold tellurides with tungsten, molybdenum, and vanadium minerals.




Regions containing this locality

North America PlateTectonic Plate
Rocky Mountains, North AmericaMountain Range

Select Mineral List Type

Standard Detailed Strunz Dana 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

39 valid minerals. 4 (TL) - type locality of valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and 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:

Allanite-(Ce)
Formula: {CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Reference: Minerals of Colorado (1997) E.B. Eckel
Altaite
Formula: PbTe
Reference: Minerals of Colorado (1997) Eckel, E. B.
Alunite
Formula: KAl3(SO4)2(OH)6
Reference: Minerals of Colorado (1997) Eckels, E. B.
Calaverite
Formula: AuTe2
Localities: Reported from at least 6 localities in this region.
Calcite
Formula: CaCO3
Reference: Minerals of Colorado (1997) Eckel, E. B.
Calomel
Formula: (Hg2)2+Cl2
Reference: Minerals of Colorado (1997) Eckel, E. B.
Chalcopyrite
Formula: CuFeS2
Reference: Minerals of Colorado (1997) E.B. Eckel
'Chlorite Group'
Reference: Minerals of Colorado (1997) Eckel, E. B.
Coloradoite (TL)
Formula: HgTe
Description: Closely intermixed with native tellurium and quartz. The type description of coloradoite was based on impure specimens from the Keystone and Mountain Lion mines in the Magnolia district and from the Smuggler mine in the Balarat district.
Reference: "Minerals of Colorado, updated & revised", p. 158, by Eckel, Edwin B., 1997
Empressite
Formula: AgTe
Reference: In the collection of Brent Thorne.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Minerals of Colorado (1997) E.B. Eckel
'Fayalite-Forsterite Series'
Reference: Minerals of Colorado (1997) Eckel, E. B.
'Feldspar Group'
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
Ferberite
Formula: FeWO4
Ferrotellurite (TL)
Formula: Fe(TeO4) (?)
Type Locality:
Reference: Heys Mineral Index 3rd ed.
Fluorite
Formula: CaF2
Reference: Minerals of Colorado (1997) E.B. Eckel
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Minerals of Colorado (1997) Eckel, E. B.
Goethite
Formula: α-Fe3+O(OH)
Reference: Van King
Gold
Formula: Au
Localities: Reported from at least 17 localities in this region.
Hessite
Formula: Ag2Te
Reference: Minerals of Colorado (1997) E.B. Eckel
Hübnerite
Formula: MnWO4
Reference: Minerals of Colorado (1997) Eckel, E. B.
Ilmenite
Formula: Fe2+TiO3
Reference: Minerals of Colorado (1997) Eckel, E. B.
Ilmenite var: Picrotitanite
Formula: Fe2+TiO3
Reference: Minerals of Colorado (1997) Eckel, E. B.
Iodargyrite
Formula: AgI
Reference: Minerals of Colorado (1997) Eckel, E. B.
Keystoneite (TL)
Formula: Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Description: Golden yellow. Admantine luster. Radiating sprays & parallel growth aggregates of hexagonal, aciciular xls. Ave. size of xls: 0.2 x 0.02 x 0.02 mm.
Reference: "Minerals of Colorado, updated & revised", p. 289, by Eckel, Edwin B., 1997
'Limonite'
Formula: (Fe,O,OH,H2O)
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
Magnolite (TL)
Formula: (Hg+2)(Te4+O3)
Reference: Minerals of Colorado (1997) Eckel, E. B.
Marcasite
Formula: FeS2
Reference: Minerals of Colorado (1997) E.B. Eckel
Melonite
Formula: NiTe2
Mercury
Formula: Hg
'Mica Group'
Reference: Minerals of Colorado (1997) Eckel, E. B.
Molybdenite
Formula: MoS2
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; U.S. Geological Survey Professional Paper 223; William Crowley Kelly, Edwin Newell Goddard (1969) Telluride Ores of Boulder County, Colorado. GSA Memoir 109.
'Native Amalgam'
Formula: (Ag,Hg)
Reference: Minerals of Colorado (1997) Eckel, E. B.
Paratellurite
Formula: TeO2
Reference: Minerals of Colorado (1997) Eckel, E. B.
Petzite
Formula: Ag3AuTe2
Reference: Minerals of Colorado (1997) E.B. Eckel
Pyrite
Formula: FeS2
Pyrrhotite
Formula: Fe7S8
Reference: Minerals of Colorado (1997) E.B. Eckel
Quartz
Formula: SiO2
Localities: Reported from at least 6 localities in this region.
Quartz var: Chalcedony
Formula: SiO2
Reference: Minerals of Colorado (1997) Eckel, E. B.
Rickardite
Formula: Cu7Te5
Reference: Minerals of Colorado (1997) E.B. Eckel
Roscoelite
Formula: K(V3+,Al)2(AlSi3O10)(OH)2
Reference: Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Reference: Minerals of Colorado (1997) Eckel, E. B.
Silver
Formula: Ag
Sphalerite
Formula: ZnS
Reference: Minerals of Colorado (1997) Eckel, E. B.
Stibnite
Formula: Sb2S3
Reference: Minerals of Colorado (1997) Eckel, E. B.
Sylvanite
Formula: (Au,Ag)2Te4
Localities: Reported from at least 9 localities in this region.
Tellurite
Formula: TeO2
Tellurium
Formula: Te
Weishanite
Formula: (Au,Ag,Hg)
Description: structural ID confirmed weishanite. these are the best known crystals of weishanite.
Reference: EDS analysed by J.Desor 2016_11_28; Bindi, L., Keutsch, F.N., Lepore, G.O. (2018): Structural and chemical study of weishanite, (Au,Ag,Hg), from the Keystone mine, Colorado, USA. Mineralogical Magazine 82, 1141-1145.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Mercury1.AD.05Hg
Silver1.AA.05Ag
Tellurium1.CC.10Te
Weishanite1.AD.20a(Au,Ag,Hg)
Group 2 - Sulphides and Sulfosalts
Altaite2.CD.10PbTe
Calaverite2.EA.10AuTe2
Chalcopyrite2.CB.10aCuFeS2
Coloradoite (TL)2.CB.05aHgTe
Empressite2.CB.80AgTe
Hessite2.BA.60Ag2Te
Marcasite2.EB.10aFeS2
Melonite2.EA.20NiTe2
Molybdenite2.EA.30MoS2
Petzite2.BA.75Ag3AuTe2
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Rickardite2.BA.30Cu7Te5
Sphalerite2.CB.05aZnS
Stibnite2.DB.05Sb2S3
Sylvanite2.EA.05(Au,Ag)2Te4
Group 3 - Halides
Calomel3.AA.30(Hg2)2+Cl2
Fluorite3.AB.25CaF2
Iodargyrite3.AA.10AgI
Group 4 - Oxides and Hydroxides
Ferberite4.DB.30FeWO4
Goethite4.00.α-Fe3+O(OH)
Hübnerite4.DB.30MnWO4
Ilmenite4.CB.05Fe2+TiO3
var: Picrotitanite4.CB.05Fe2+TiO3
Keystoneite (TL)4.JM.05Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Magnolite (TL)4.JK.60(Hg+2)(Te4+O3)
Paratellurite4.DE.25TeO2
Quartz4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
Tellurite4.DE.20TeO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Alunite7.BC.10KAl3(SO4)2(OH)6
Ferrotellurite (TL)7.AB.10Fe(TeO4) (?)
Group 9 - Silicates
Allanite-(Ce)9.BG.05b{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Roscoelite9.EC.15K(V3+,Al)2(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Fayalite-Forsterite Series'-
'Feldspar Group'-
'Garnet Group'-X3Z2(SiO4)3
'Limonite'-(Fe,O,OH,H2O)
'Mica Group'-
'Native Amalgam'-(Ag,Hg)
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Mercury1.1.7.1Hg
Silver1.1.1.2Ag
Weishanite1.1.8.6(Au,Ag,Hg)
Semi-metals and non-metals
Tellurium1.3.4.2Te
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Hessite2.4.2.1Ag2Te
Petzite2.4.3.3Ag3AuTe2
AmXp, with m:p = 1:1
Altaite2.8.1.3PbTe
Coloradoite (TL)2.8.2.5HgTe
Empressite2.8.25.AgTe
Pyrrhotite2.8.10.1Fe7S8
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 2:3
Stibnite2.11.2.1Sb2S3
AmBnXp, with (m+n):p = 1:2
Calaverite2.12.13.2AuTe2
Marcasite2.12.2.1FeS2
Melonite2.12.14.1NiTe2
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Sylvanite2.12.13.3(Au,Ag)2Te4
Miscellaneous
Rickardite2.16.15.1Cu7Te5
Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
AX2
Paratellurite4.4.3.2TeO2
Tellurite4.4.6.1TeO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 9 - NORMAL HALIDES
AX
Calomel9.1.8.1(Hg2)2+Cl2
Iodargyrite9.1.5.1AgI
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Alunite30.2.4.1KAl3(SO4)2(OH)6
Group 34 - SELENITES, TELLURITES AND SULFITES
A(XO3)
Magnolite (TL)34.1.7.1(Hg+2)(Te4+O3)
A2(XO3)3·xH2O
Keystoneite (TL)34.3.2.3Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Ferberite48.1.1.2FeWO4
Hübnerite48.1.1.1MnWO4
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Allanite-(Ce)58.2.1a.1{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Roscoelite71.2.2a.4K(V3+,Al)2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
'Fayalite-Forsterite Series'-
'Feldspar Group'-
Ferrotellurite (TL)-Fe(TeO4) (?)
'Garnet Group'-X3Z2(SiO4)3
Ilmenite
var: Picrotitanite
-Fe2+TiO3
'Limonite'-(Fe,O,OH,H2O)
'Mica Group'-
'Native Amalgam'-(Ag,Hg)
Quartz
var: Chalcedony
-SiO2
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
H RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
H AluniteKAl3(SO4)2(OH)6
H Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
H Limonite(Fe,O,OH,H2O)
H Goethiteα-Fe3+O(OH)
CCarbon
C CalciteCaCO3
OOxygen
O Magnolite(Hg2+)(Te4+O3)
O KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
O FerrotelluriteFe(TeO4) (?)
O TelluriteTeO2
O QuartzSiO2
O RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
O FerberiteFeWO4
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
O AluniteKAl3(SO4)2(OH)6
O Quartz (var: Chalcedony)SiO2
O HübneriteMnWO4
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
O Ilmenite (var: Picrotitanite)Fe2+TiO3
O CalciteCaCO3
O Garnet GroupX3Z2(SiO4)3
O ParatelluriteTeO2
O Limonite(Fe,O,OH,H2O)
O IlmeniteFe2+TiO3
O Goethiteα-Fe3+O(OH)
FFluorine
F FluoriteCaF2
MgMagnesium
Mg KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
AlAluminium
Al RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Al AluniteKAl3(SO4)2(OH)6
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
SiSilicon
Si QuartzSiO2
Si RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Si Quartz (var: Chalcedony)SiO2
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Si Garnet GroupX3Z2(SiO4)3
SSulfur
S MolybdeniteMoS2
S PyriteFeS2
S AluniteKAl3(SO4)2(OH)6
S SphaleriteZnS
S StibniteSb2S3
S ChalcopyriteCuFeS2
S PyrrhotiteFe7S8
S MarcasiteFeS2
ClChlorine
Cl Calomel(Hg2)2+Cl2
KPotassium
K RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
K AluniteKAl3(SO4)2(OH)6
CaCalcium
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Ca CalciteCaCO3
Ca FluoriteCaF2
TiTitanium
Ti Ilmenite (var: Picrotitanite)Fe2+TiO3
Ti IlmeniteFe2+TiO3
VVanadium
V RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
MnManganese
Mn KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Mn HübneriteMnWO4
Mn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Fe FerrotelluriteFe(TeO4) (?)
Fe FerberiteFeWO4
Fe PyriteFeS2
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Fe Ilmenite (var: Picrotitanite)Fe2+TiO3
Fe ChalcopyriteCuFeS2
Fe PyrrhotiteFe7S8
Fe MarcasiteFeS2
Fe Limonite(Fe,O,OH,H2O)
Fe IlmeniteFe2+TiO3
Fe Goethiteα-Fe3+O(OH)
NiNickel
Ni KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Ni Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Ni MeloniteNiTe2
CuCopper
Cu ChalcopyriteCuFeS2
Cu RickarditeCu7Te5
ZnZinc
Zn SphaleriteZnS
Zn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
MoMolybdenum
Mo MolybdeniteMoS2
AgSilver
Ag Sylvanite(Au,Ag)2Te4
Ag SilverAg
Ag Native Amalgam(Ag,Hg)
Ag IodargyriteAgI
Ag HessiteAg2Te
Ag PetziteAg3AuTe2
Ag EmpressiteAgTe
Ag Weishanite(Au,Ag,Hg)
SbAntimony
Sb StibniteSb2S3
TeTellurium
Te Magnolite(Hg2+)(Te4+O3)
Te ColoradoiteHgTe
Te KeystoneiteMg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Te FerrotelluriteFe(TeO4) (?)
Te TelluriumTe
Te TelluriteTeO2
Te Sylvanite(Au,Ag)2Te4
Te AltaitePbTe
Te CalaveriteAuTe2
Te MeloniteNiTe2
Te ParatelluriteTeO2
Te HessiteAg2Te
Te PetziteAg3AuTe2
Te RickarditeCu7Te5
Te EmpressiteAgTe
IIodine
I IodargyriteAgI
CeCerium
Ce Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
WTungsten
W FerberiteFeWO4
W HübneriteMnWO4
AuGold
Au GoldAu
Au Sylvanite(Au,Ag)2Te4
Au CalaveriteAuTe2
Au PetziteAg3AuTe2
Au Weishanite(Au,Ag,Hg)
HgMercury
Hg Magnolite(Hg2+)(Te4+O3)
Hg ColoradoiteHgTe
Hg MercuryHg
Hg Native Amalgam(Ag,Hg)
Hg Calomel(Hg2)2+Cl2
Hg Weishanite(Au,Ag,Hg)
PbLead
Pb AltaitePbTe

References

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U.S. Geological Survey Professional Paper 223.

External Links


Localities in this Region


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.
 
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