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Eldora, Caribou Mining District, Boulder Co., Colorado, USAi
Regional Level Types
EldoraTown
Caribou Mining DistrictMining District
Boulder Co.County
ColoradoState
USACountry

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Key
Latitude & Longitude (WGS84):
39° 56' 54'' North , 105° 33' 49'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Other/historical names associated with this locality:
Eldorado


Eldora is a town in the Caribou Mining District, about 3 miles west of Nederland. Local mines include the mines near Lost Lake and southwest of Grand Island as well as those south of the town. It has had only a small output and is of interest chiefly because of its gold-telluride ores, which were discovered about 1896. The deposits were actively developed during the following decade, but since 1906 the camp has been comparatively inactive. The only mine credited with a noteworthy output is the Enterprise, about half a mile south of Eldora.

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

9 valid minerals.

Detailed Mineral List:

Baryte
Formula: BaSO4
Reference: U.S. Geological Survey Professional Paper 223
Gold
Formula: Au
'K Feldspar'
Reference: U.S. Geological Survey Professional Paper 223
'K Feldspar var: Adularia'
Formula: KAlSi3O8
Reference: U.S. Geological Survey Professional Paper 223
Molybdenite
Formula: MoS2
Reference: U.S. Geological Survey Professional Paper 223
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: U.S. Geological Survey Professional Paper 223
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: U.S. Geological Survey Professional Paper 223
Petzite
Formula: Ag3AuTe2
Reference: Minerals of Colorado (1997) E.B. Eckel; U.S. Geological Survey Professional Paper 223
Pyrite
Formula: FeS2
Reference: Eckel, Edwin Butt, Robert R. Cobban, Shirley K. Mosburg (1997), Minerals of Colorado, updated & revised., 676 pp., Fulcrum Publishing (ISBN-10: 1555913652; ISBN-13: 978-1555913656).
Quartz
Formula: SiO2
Roscoelite
Formula: K(V3+,Al)2(AlSi3O10)(OH)2
Sylvanite
Formula: (Au,Ag)2Te4
Reference: Eckel, Edwin Butt, Robert R. Cobban, Shirley K. Mosburg (1997), Minerals of Colorado, updated & revised., 676 pp., Fulcrum Publishing (ISBN-10: 1555913652; ISBN-13: 978-1555913656).

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Molybdenite2.EA.30MoS2
Petzite2.BA.75Ag3AuTe2
Pyrite2.EB.05aFeS2
Sylvanite2.EA.05(Au,Ag)2Te4
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Roscoelite9.EC.15K(V3+,Al)2(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'K Feldspar'-
'var: Adularia'-KAlSi3O8

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
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Petzite2.4.3.3Ag3AuTe2
AmBnXp, with (m+n):p = 1:2
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Sylvanite2.12.13.3(Au,Ag)2Te4
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
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.
'K Feldspar'-
'var: Adularia'-KAlSi3O8
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2

List of minerals for each chemical element

HHydrogen
H RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
OOxygen
O QuartzSiO2
O RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
O BaryteBaSO4
O K Feldspar (var: Adularia)KAlSi3O8
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O MuscoviteKAl2(AlSi3O10)(OH)2
AlAluminium
Al RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
Al K Feldspar (var: Adularia)KAlSi3O8
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si QuartzSiO2
Si RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
Si K Feldspar (var: Adularia)KAlSi3O8
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
SSulfur
S PyriteFeS2
S BaryteBaSO4
S MolybdeniteMoS2
KPotassium
K RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
K K Feldspar (var: Adularia)KAlSi3O8
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
VVanadium
V RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
FeIron
Fe PyriteFeS2
MoMolybdenum
Mo MolybdeniteMoS2
AgSilver
Ag PetziteAg3AuTe2
Ag Sylvanite(Au,Ag)2Te4
TeTellurium
Te PetziteAg3AuTe2
Te Sylvanite(Au,Ag)2Te4
BaBarium
Ba BaryteBaSO4
AuGold
Au GoldAu
Au PetziteAg3AuTe2
Au Sylvanite(Au,Ag)2Te4

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Bastin, Edson S. and Hill, James M. (1917), Economic Geology of Gilpin County and adjacent parts of Clear Creek and Boulder Counties, Colorado, USGS Professional Paper 94, 379 pp.
Lovering, T.S.and E.N. Goddard (1950), Geology and ore deposits of the Front Range, Colorado, USGS Professional Paper 223, 319 pp.

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