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Mt. Emmons/Crested Butte (Chautauqua; Daisey; Daisey Mine; Mt. Emmons; Crested Butte), Elk Mountain District, Gunnison Co., Colorado, USAi
Regional Level Types
Mt. Emmons/Crested Butte (Chautauqua; Daisey; Daisey Mine; Mt. Emmons; Crested Butte)Table/Butte
Elk Mountain DistrictMining District
Gunnison Co.County
ColoradoState
USACountry

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Key
Lock Map
Latitude & Longitude (WGS84): 38° 52' 8'' North , 107° 2' 18'' West
Latitude & Longitude (decimal): 38.86889,-107.03861
GeoHash:G#: 9wgvh7bge
USGS MRDS Record:10215357
Locality type:Table/Butte
Köppen climate type:Dfc : Subarctic climate
Nearest Settlements:
PlacePopulationDistance
Crested Butte1,579 (2017)4.4km
Mount Crested Butte801 (2012)7.9km
Marble135 (2017)26.1km
Gunnison6,076 (2018)37.2km
Redstone130 (2011)38.8km


A former porphyry Mo-Zn-Ag-Au-Cu-Pb occurrence/mine located in the NE¼SE¼NE¼ sec. 6, T14S, R86W, 6thPM. MRDS database stated accuracy for this location is 10 meters.

The Mt. Emmons ore deposit is an example of the Climax-type porphyry molybdenum deposit. The geology of this type of ore deposit is described by Ludington and Plumlee (2009). They note that Climax-type molybdenum deposits are quite rare and give only 13 examples. Of these, the Climax ore deposit is far and away the largest. The Mt. Emmons deposit, is approximately 20% it's size.

In cross section the Mt. Emmons deposit has the classic Climax-type mushroom-like configuration (Mineral occurrence model information: Model code: 50; USGS model code: 16; Deposit model name: Climax Mo). Beneath Mt. Emmons a small, abrupt plug-like stock represents the mushroom stem while the ore deposit is like the cap, a draping dome over the intrusion's top. The ore body is blind, more than 900 feet below the surface, but a significant area of phyllic alteration is present on the surface.

The ore deposit has not been developed beyond exploratory work. As of early 2017 there may be a move by the owner to abandon the project, liquidate the property and repatriate the claims to the government given that the molybdenum market has been soft for many years and will be characterized by over capacity from lower cost sources for the foreseeable future.

Local rocks include rocks of the Mesaverde Formation, undivided.

NOTE: The MSHA list of 1-17-80 shows 2 ID numbers: 0503142 is shown as a past producer (Moly), and 91 employees; and, 0500409 is shown as active (Moly) with 70 employees.

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


20 valid minerals.

Detailed Mineral List:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Reference: Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Anglesite
Formula: PbSO4
Reference: Minerals of Colorado (1997) Eckel, E. B.
Beryl
Formula: Be3Al2(Si6O18)
Description: Occurs rarely as disseminations, within veins, and within miarolitic cavities beneath molybdenum mineralization shell in rhyolite/granite porphyry. Blue to white in color, locally transparent. Crystals up to 1+ cm long in miarolitic cavities. Associated in part with greisen along with molybdenite, pyrite, muscovite, and fluorite.
Reference: Mark Coolbaugh
'Biotite'
Reference: Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Calcite
Formula: CaCO3
Reference: Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Chalcopyrite
Formula: CuFeS2
Reference: Junxing Zhao, Kezhang Qin, Guangming Li, and Jinxiang Li (2011): Geology and Exploration 47(1), 54-70
'Chlorite Group'
Reference: Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Fluorite
Formula: CaF2
Reference: Junxing Zhao, Kezhang Qin, Guangming Li, and Jinxiang Li (2011): Geology and Exploration 47(1), 54-70; Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Galena
Formula: PbS
Reference: Junxing Zhao, Kezhang Qin, Guangming Li, and Jinxiang Li (2011): Geology and Exploration 47(1), 54-70
Hematite
Formula: Fe2O3
Reference: Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Heyrovskýite
Formula: Pb6Bi2S9
Habit: together with lillianite, as irregular masses, and as acicular needles and blades up to 4 mm long
Description: Found with lillianite in a 1-2 cm wide pyrite-clinochlore-ankerite-fluorite-quartz vein above the molybdenite mineralized shell. XRD analysis by Mati Raudsepp, University of British Columbia. XRF analysis identifies presence of Bi, Pb, and minor Ag.
Reference: Mark Coolbaugh
Hübnerite
Formula: MnWO4
Reference: Junxing Zhao, Kezhang Qin, Guangming Li, and Jinxiang Li (2011): Geology and Exploration 47(1), 54-70
'K Feldspar'
Reference: Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Lillianite
Formula: Pb3-2xAgxBi2+xS6
Habit: together with heyrovskyite, as irregular masses, and acicular crystals and blades up to 4 mm long
Description: Found with heyrovskyite in a 1-2 cm wide pyrite-clinochlore-ankerite-fluorite-quartz vein above the molybdenite mineralized shell. XRD analysis by Mati Raudsepp, University of British Columbia. XRF analysis identifies presence of Bi, Pb, and minor Ag.
Reference: Mark Coolbaugh
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Minerals of Colorado (1997) Eckel, E. B.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Molybdenite
Formula: MoS2
Reference: Junxing Zhao, Kezhang Qin, Guangming Li, and Jinxiang Li (2011): Geology and Exploration 47(1), 54-70; Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Junxing Zhao, Kezhang Qin, Guangming Li, and Jinxiang Li (2011): Geology and Exploration 47(1), 54-70; Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Junxing Zhao, Kezhang Qin, Guangming Li, and Jinxiang Li (2011): Geology and Exploration 47(1), 54-70; Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Pyrite
Formula: FeS2
Reference: Junxing Zhao, Kezhang Qin, Guangming Li, and Jinxiang Li (2011): Geology and Exploration 47(1), 54-70; Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Pyrrhotite
Formula: Fe7S8
Reference: Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Quartz
Formula: SiO2
Reference: Junxing Zhao, Kezhang Qin, Guangming Li, and Jinxiang Li (2011): Geology and Exploration 47(1), 54-70; Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Scheelite
Formula: Ca(WO4)
Description: occurs sparingly with huebnerite
Reference: Mark Coolbaugh
Sphalerite
Formula: ZnS
Reference: Junxing Zhao, Kezhang Qin, Guangming Li, and Jinxiang Li (2011): Geology and Exploration 47(1), 54-70

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Heyrovskýite2.JB.40bPb6Bi2S9
Lillianite2.JB.40aPb3-2xAgxBi2+xS6
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Sphalerite2.CB.05aZnS
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Hübnerite4.DB.30MnWO4
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anglesite7.AD.35PbSO4
Scheelite7.GA.05Ca(WO4)
Group 9 - Silicates
Actinolite9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Beryl9.CJ.05Be3Al2(Si6O18)
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Biotite'-
'Chlorite Group'-
'K Feldspar'-
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Pyrrhotite2.8.10.1Fe7S8
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
3 <ø < 4
Heyrovskýite3.3.3.1Pb6Bi2S9
ø = 3
Lillianite3.4.15.1Pb3-2xAgxBi2+xS6
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anglesite28.3.1.3PbSO4
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Hübnerite48.1.1.1MnWO4
Scheelite48.1.2.1Ca(WO4)
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)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
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
Unclassified Minerals, Mixtures, etc.
Actinolite-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
'Biotite'-
'Chlorite Group'-
'K Feldspar'-
'Limonite'-(Fe,O,OH,H2O)
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2

List of minerals for each chemical element

HHydrogen
H Limonite(Fe,O,OH,H2O)
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
BeBeryllium
Be BerylBe3Al2(Si6O18)
CCarbon
C CalciteCaCO3
OOxygen
O Limonite(Fe,O,OH,H2O)
O AnglesitePbSO4
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O QuartzSiO2
O HübneriteMnWO4
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O MagnetiteFe2+Fe23+O4
O CalciteCaCO3
O HematiteFe2O3
O MuscoviteKAl2(AlSi3O10)(OH)2
O BerylBe3Al2(Si6O18)
O ScheeliteCa(WO4)
FFluorine
F FluoriteCaF2
MgMagnesium
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
AlAluminium
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al BerylBe3Al2(Si6O18)
SiSilicon
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si QuartzSiO2
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si BerylBe3Al2(Si6O18)
SSulfur
S AnglesitePbSO4
S MolybdeniteMoS2
S PyriteFeS2
S SphaleriteZnS
S GalenaPbS
S ChalcopyriteCuFeS2
S PyrrhotiteFe7S8
S LillianitePb3-2xAgxBi2+xS6
S HeyrovskýitePb6Bi2S9
KPotassium
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca FluoriteCaF2
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Ca CalciteCaCO3
Ca ScheeliteCa(WO4)
MnManganese
Mn HübneriteMnWO4
FeIron
Fe Limonite(Fe,O,OH,H2O)
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe MagnetiteFe2+Fe23+O4
Fe PyrrhotiteFe7S8
Fe HematiteFe2O3
CuCopper
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SphaleriteZnS
MoMolybdenum
Mo MolybdeniteMoS2
AgSilver
Ag LillianitePb3-2xAgxBi2+xS6
WTungsten
W HübneriteMnWO4
W ScheeliteCa(WO4)
PbLead
Pb AnglesitePbSO4
Pb GalenaPbS
Pb LillianitePb3-2xAgxBi2+xS6
Pb HeyrovskýitePb6Bi2S9
BiBismuth
Bi LillianitePb3-2xAgxBi2+xS6
Bi HeyrovskýitePb6Bi2S9

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

Late Cretaceous
66 - 100.5 Ma



ID: 2866638
Mesaverde Fm, undivided

Age: Late Cretaceous (66 - 100.5 Ma)

Stratigraphic Name: Mesaverde Formation

Description: In northwest and west-central: Major coal beds in lower part; Rollins Sandstone Member at base in Delta, Gunnison, and Pitkin Counties. In southwest: sandstone and shale.

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:{sandstone}, Minor:{shale,coal}

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]

Early Jurassic - Late Triassic
174.1 - 237 Ma



ID: 3185972
Mesozoic sedimentary rocks

Age: Mesozoic (174.1 - 237 Ma)

Lithology: Sandstone-conglomerate

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]

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)
Dowsett, F. R., Jr., M. W. Ganster, D. E. Ranta, D. J. Baker, and H. J. Stein, (1981) Geology of the Mount Emmons molybdenum deposit, Crested Butte, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 325-332.
Eckel, Edwin B. (1997), Minerals of Colorado, updated & revised.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10215357.
Ludington, Steve and Plumlee, G.S. (2009), Climax-type porphyry molybdenum deposits, USGS Open File Report 2009–1215, 16 p.
Junxing Zhao, Kezhang Qin, Guangming Li, and Jinxiang Li (2011): Characteristics of alteration and mineralization in the Sharang porphyry molybdenum deposit in the northern margin of Gangdese and comparison with typical porphyry molybdenum deposits in the world. Geology and Exploration 47(1), 54-70.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0080510492.


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