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Cotopaxi Feldspar Mine (Cotopaxi Feldspar prospect; Henry pegmatite), Cotopaxi Pegmatite area, Cotopaxi, Cotopaxi District, Fremont Co., Colorado, USAi
Regional Level Types
Cotopaxi Feldspar Mine (Cotopaxi Feldspar prospect; Henry pegmatite)Mine
Cotopaxi Pegmatite areaArea
Cotopaxi- not defined -
Cotopaxi DistrictMining District
Fremont Co.County
ColoradoState
USACountry

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Key
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Latitude & Longitude (WGS84): 38° 25' 11'' North , 105° 40' 27'' West
Latitude & Longitude (decimal): 38.41989,-105.67433
GeoHash:G#: 9wufe64k1
Locality type:Mine
Köppen climate type:BSk : Cold semi-arid (steppe) climate
Nearest Settlements:
PlacePopulationDistance
Coaldale255 (2011)9.5km
Howard723 (2011)14.4km
Salida5,467 (2017)31.0km
Smeltertown120 (2011)32.8km
Westcliffe577 (2017)36.5km


A former feldspar pegmatite occurrence/mine located on the boundary between secs. 7 & 8, T48N, R12E, NMM, approximately 3½ miles NNE of Cotopaxi, W of Fernleaf Gulch, E of Bernard Creek and N of the Arkansas River. Owned by the Colorado Feldspar Company, Canon City. Operated for several months in 1939.

NOTE: The geographic coordinates presented were taken from the topo map based on the description furnished (prospect on the secs. 7 & 8 line).

The pegmatite cropped out as an irregular knob prior to mining, but this knob has been almost completely removed. The exposures that remain consist of graphic and granitic intergrowths of quartz and feldspar, massive quartz, nests of biotite, and distorted octahedrons of magnetite. A small quantity of buff to gray feldspar occurs in masses 2 feet in length. After crystallization of the feldspar, it was altered by solutions, and hematite, muscovite, uraninite, and another mineral tentatively identified as samarskite were deposited. One patch of pegmatite containing 75 pounds of uraninite is reported to have been found.

Workings include a shallow open cut 60 feet long, 40 feet wide and 6 feet deep (the topo map reflects 1 prospect pit symbol at the end of a unimproved, dead end road).

A few hundred tons of feldspar were produced.

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 at this locality.


Mineral List


14 valid minerals. 1 erroneous literature entry.

Detailed Mineral List:

'Albite-Anorthite Series'
Reference: Minerals of Colorado (1997) Eckel, E. B.
Allanite-(Ce)
Formula: {CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Reference: "Minerals of Colorado, updated & revised", pp. 14-15, by Eckel, Edwin B., 1997
'Biotite'
Reference: "Minerals of Colorado, updated & revised", pp. 14-15, by Eckel, Edwin B., 1997; USGS Prof. Paper 227
'Columbite-(Fe)-Columbite-(Mn) Series'
Reference: "Minerals of Colorado, updated & revised", pp. 14-15, by Eckel, Edwin B., 1997
Euxenite-(Y)
Formula: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Reference: "Minerals of Colorado, updated & revised", pp. 14-15, by Eckel, Edwin B., 1997
Fluorite
Formula: CaF2
Reference: "Minerals of Colorado, updated & revised", pp. 14-15, by Eckel, Edwin B., 1997
Hematite
Formula: Fe2O3
Reference: Minerals of Colorado (1997) Eckel, E. B.; USGS Prof. Paper 227
'Hornblende'
Reference: "Minerals of Colorado, updated & revised", pp. 14-15, by Eckel, Edwin B., 1997
Kainosite-(Y)
Formula: Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
Reference: "Minerals of Colorado, updated & revised", pp. 14-15, by Eckel, Edwin B., 1997
Magnetite
Formula: Fe2+Fe3+2O4
Reference: "Minerals of Colorado, updated & revised", pp. 14-15, by Eckel, Edwin B., 1997; USGS Prof. Paper 227
Microcline
Formula: K(AlSi3O8)
Reference: USGS Prof. Paper 227
Monazite-(Ce)
Formula: Ce(PO4)
Description: Reidentified as crytolite
Reference: "Minerals of Colorado, updated & revised", pp. 14-15, by Eckel, Edwin B., 1997
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: USGS Prof. Paper 227
Quartz
Formula: SiO2
Reference: USGS Prof. Paper 227
Samarskite-(Y)
Formula: (Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Reference: "Minerals of Colorado, updated & revised", pp. 14-15, by Eckel, Edwin B., 1997; USGS Prof. Paper 227
Synchysite-(Y)
Formula: CaY(CO3)2F
Reference: "Minerals of Colorado, updated & revised", pp. 14-15, by Eckel, Edwin B., 1997
Uraninite
Formula: UO2
Reference: "Minerals of Colorado, updated & revised", pp. 14-15, by Eckel, Edwin B., 1997; USGS Prof. Paper 227
Xenotime-(Y)
Formula: Y(PO4)
Reference: "Minerals of Colorado, updated & revised", pp. 14-15, by Eckel, Edwin B., 1997
Zircon
Formula: Zr(SiO4)
Reference: Minerals of Colorado (1997) Eckel, E. B.
Zircon var: Cyrtolite
Formula: Zr[(SiO4),(OH)4]
Reference: Minerals of Colorado (1997) Eckel, E. B.

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Euxenite-(Y)4.DG.05(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Hematite4.CB.05Fe2O3
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Samarskite-(Y)4.DB.25(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Uraninite4.DL.05UO2
Group 5 - Nitrates and Carbonates
Synchysite-(Y)5.BD.20cCaY(CO3)2F
Group 8 - Phosphates, Arsenates and Vanadates
Monazite-(Ce) ?8.AD.50Ce(PO4)
Xenotime-(Y)8.AD.35Y(PO4)
Group 9 - Silicates
Allanite-(Ce)9.BG.05b{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Kainosite-(Y)9.CF.10Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
Microcline9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Zircon9.AD.30Zr(SiO4)
var: Cyrtolite9.AD.30Zr[(SiO4),(OH)4]
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Biotite'-
'Columbite-(Fe)-Columbite-(Mn) Series'-
'Hornblende'-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Uraninite5.1.1.1UO2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
ABO4
Samarskite-(Y)8.1.11.1(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
AB2O6
Euxenite-(Y)8.3.8.2(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Synchysite-(Y)16a.1.3.2CaY(CO3)2F
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
AXO4
Monazite-(Ce) ?38.4.3.1Ce(PO4)
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
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)
Group 60 - CYCLOSILICATES Four-Membered Rings
Four-Membered Rings with other anion groups
Kainosite-(Y)60.2.1.1Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
'Biotite'-
'Columbite-(Fe)-Columbite-(Mn) Series'-
'Hornblende'-
Xenotime-(Y)-Y(PO4)
Zircon
var: Cyrtolite
-Zr[(SiO4),(OH)4]

List of minerals for each chemical element

HHydrogen
H Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
H Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
H Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
H MuscoviteKAl2(AlSi3O10)(OH)2
CCarbon
C Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
C Synchysite-(Y)CaY(CO3)2F
OOxygen
O Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
O Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
O Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
O MagnetiteFe2+Fe23+O4
O Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
O Synchysite-(Y)CaY(CO3)2F
O UraniniteUO2
O Xenotime-(Y)Y(PO4)
O Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
O HematiteFe2O3
O QuartzSiO2
O MicroclineK(AlSi3O8)
O MuscoviteKAl2(AlSi3O10)(OH)2
O ZirconZr(SiO4)
O Monazite-(Ce)Ce(PO4)
FFluorine
F FluoriteCaF2
F Synchysite-(Y)CaY(CO3)2F
AlAluminium
Al Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Al MicroclineK(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Si Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
Si Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
Si QuartzSiO2
Si MicroclineK(AlSi3O8)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si ZirconZr(SiO4)
PPhosphorus
P Xenotime-(Y)Y(PO4)
P Monazite-(Ce)Ce(PO4)
KPotassium
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Ca Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Ca FluoriteCaF2
Ca Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
Ca Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Ca Synchysite-(Y)CaY(CO3)2F
TiTitanium
Ti Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
FeIron
Fe Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Fe MagnetiteFe2+Fe23+O4
Fe Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Fe HematiteFe2O3
YYttrium
Y Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Y Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
Y Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Y Synchysite-(Y)CaY(CO3)2F
Y Xenotime-(Y)Y(PO4)
ZrZirconium
Zr Zircon (var: Cyrtolite)Zr[(SiO4),(OH)4]
Zr ZirconZr(SiO4)
NbNiobium
Nb Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Nb Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
CeCerium
Ce Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Ce Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Ce Monazite-(Ce)Ce(PO4)
TaTantalum
Ta Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Ta Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
ThThorium
Th Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Th Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
UUranium
U Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
U Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
U UraniniteUO2

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Paleoproterozoic
1600 - 2500 Ma



ID: 3186950
Paleoproterozoic crystalline metamorphic rocks

Age: Proterozoic (1600 - 2500 Ma)

Lithology: Orthogneiss/paragneiss

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Paleoproterozoic
1600 - 2500 Ma



ID: 2855906
Granitic rocks of 1700-m.y. age group

Age: Proterozoic (1600 - 2500 Ma)

Stratigraphic Name: Boulder Creek Granite; Cross Creek Granite; Denny Creek Granodiorite; Kroenke Granodiorite; Browns Pass Quartz Monzonite; Powderhorn Granite; Pitts Meadow Granodiorite; Bakers Bridge Granite; Tenmile Granite

Description: Includes Boulder Creek -M.Y. AGE GROUP (AGE 1650-1730 M.Y.)--Includes Boulder Creek, Cross Creek, Denny Creek, Kroenke, Browns Pass, Powderhorn, Pitts Meadow, Bakers Bridge, and Tenmile Granites, Quartz Monzonites, or Granodiorites; also, unnamed granitic rocks

Comments: Original map source: Green, G.N., 1992, The Digital Geologic Map of Colorado in ARC/INFO Format: U.S. Geological Survey Open-File Report 92-0507, 9 p., scale 1:500,000.

Lithology: Major:{granite}, Minor:{granodiorite,quartz monzonite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Hanley, J.B., Heinrich, E.W., and Page, L.R. (1950), Pegmatite investigations in Colorado, Wyoming, and Utah 1942-1944, A report on resources of beryllium, tantalum, and lithium minerals and of muscovite, USGS Professional Paper 227, 125 pp.: 61-62.
Eckel, Edwin B. (1997), Minerals of Colorado, updated & revised.


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