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Allard Stock, La Plata District (California District), La Plata Co., Colorado, USAi
Regional Level Types
Allard Stock- not defined -
La Plata District (California District)Mining District
La Plata Co.County
ColoradoState
USACountry

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Latitude & Longitude (WGS84): 37° 24' 24'' North , 108° 5' 20'' West
Latitude & Longitude (decimal): 37.40671,-108.08895
GeoHash:G#: 9wehu3sjb
USGS MRDS Record:10264283
Köppen climate type:Dsb : Warm, dry-summer continental climate
Nearest Settlements:
PlacePopulationDistance
Mancos1,380 (2017)19.0km
Durango18,006 (2017)23.5km
Rico255 (2017)32.2km
Dolores963 (2017)37.4km
Cortez8,715 (2017)44.4km


Former mines/claims: Gail; North Star; Morning Star; Bright Star; Offset Nos. 1-2; Northerner; Northwesterner; Minnie; Protection; Flaussie Nos. 1-3; Audrey Nos. 1-2; Prize; Chance Nos. 1-2; Unpatented Claims: Copper Hill; Jane Nos. 1-4; Bill; Beverly; Herb; Jeanie; Larry; Punkey; Skippy; Willie; Willow Springs; Esmerelda; Hill Nos. 1-3; Jean; Ute; Ruby Nos. 1-95; Shorty Nos. 1-4; Pinky Nos. 1-2; Madden No. 1; Hazel Nos. 1-2; Sandra; Marge Nos. 1-2

Deposit: Pyrite And Chalcopyrite Sparsely Disseminated Through Syenite, Which Is Traversed By Numerous, Discontinous Dikes Of Augite And Orthoclase, By Quartz Veins Containing Chalcopyrite And Pyrite, And By Quartz-Flourite Veins Carrying Pyrite And Some Galena. Oxidation Of Sulfides Visible Throughout Area.

Deposit type: Porphyry Cu

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


15 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!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Acanthite
Formula: Ag2S
Reference: Summerlin, E. (2014). PGE mineralization at the Allard stock: Implications for the porphyry to epithermal transition, La Plata Mountains, Colorado (Auburn University MS thesis).
Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Bornite
Formula: Cu5FeS4
Reference: Summerlin, E. (2014). PGE mineralization at the Allard stock: Implications for the porphyry to epithermal transition, La Plata Mountains, Colorado (Auburn University MS thesis).
Calcite
Formula: CaCO3
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; Summerlin, E. (2014). PGE mineralization at the Allard stock: Implications for the porphyry to epithermal transition, La Plata Mountains, Colorado (Auburn University MS thesis).
Chalcopyrite
Formula: CuFeS2
Reference: Summerlin, E. (2014). PGE mineralization at the Allard stock: Implications for the porphyry to epithermal transition, La Plata Mountains, Colorado (Auburn University MS thesis).
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Covellite
Formula: CuS
Reference: Summerlin, E. (2014). PGE mineralization at the Allard stock: Implications for the porphyry to epithermal transition, La Plata Mountains, Colorado (Auburn University MS thesis).
Fluorite
Formula: CaF2
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Galena
Formula: PbS
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; Summerlin, E. (2014). PGE mineralization at the Allard stock: Implications for the porphyry to epithermal transition, La Plata Mountains, Colorado (Auburn University MS thesis).
Hematite
Formula: Fe2O3
Reference: Summerlin, E. (2014). PGE mineralization at the Allard stock: Implications for the porphyry to epithermal transition, La Plata Mountains, Colorado (Auburn University MS thesis).
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; Summerlin, E. (2014). PGE mineralization at the Allard stock: Implications for the porphyry to epithermal transition, La Plata Mountains, Colorado (Auburn University MS thesis).
Malachite
Formula: Cu2(CO3)(OH)2
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Pyrite
Formula: FeS2
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; Summerlin, E. (2014). PGE mineralization at the Allard stock: Implications for the porphyry to epithermal transition, La Plata Mountains, Colorado (Auburn University MS thesis).
Quartz
Formula: SiO2
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Sphalerite
Formula: ZnS
Reference: Summerlin, E. (2014). PGE mineralization at the Allard stock: Implications for the porphyry to epithermal transition, La Plata Mountains, Colorado (Auburn University MS thesis).

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Acanthite2.BA.35Ag2S
Bornite2.BA.15Cu5FeS4
Chalcopyrite2.CB.10aCuFeS2
Covellite2.CA.05aCuS
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Malachite5.BA.10Cu2(CO3)(OH)2
Group 9 - Silicates
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Unclassified Minerals, Rocks, etc.
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Acanthite2.4.1.1Ag2S
AmBnXp, with (m+n):p = 3:2
Bornite2.5.2.1Cu5FeS4
AmXp, with m:p = 1:1
Covellite2.8.12.1CuS
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
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 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Augite65.1.3a.3(CaxMgyFez)(Mgy1Fez1)Si2O6
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Chrysocolla74.3.2.1Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Limonite'-(Fe,O,OH,H2O)

List of minerals for each chemical element

HHydrogen
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
H Limonite(Fe,O,OH,H2O)
H MalachiteCu2(CO3)(OH)2
CCarbon
C CalciteCaCO3
C MalachiteCu2(CO3)(OH)2
OOxygen
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O CalciteCaCO3
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O Limonite(Fe,O,OH,H2O)
O MagnetiteFe2+Fe23+O4
O MalachiteCu2(CO3)(OH)2
O QuartzSiO2
O HematiteFe2O3
FFluorine
F FluoriteCaF2
MgMagnesium
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
AlAluminium
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
SiSilicon
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si QuartzSiO2
SSulfur
S GalenaPbS
S PyriteFeS2
S ChalcopyriteCuFeS2
S SphaleriteZnS
S AcanthiteAg2S
S BorniteCu5FeS4
S CovelliteCuS
CaCalcium
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca CalciteCaCO3
Ca FluoriteCaF2
FeIron
Fe PyriteFeS2
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe Limonite(Fe,O,OH,H2O)
Fe MagnetiteFe2+Fe23+O4
Fe ChalcopyriteCuFeS2
Fe HematiteFe2O3
Fe BorniteCu5FeS4
CuCopper
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Cu MalachiteCu2(CO3)(OH)2
Cu ChalcopyriteCuFeS2
Cu BorniteCu5FeS4
Cu CovelliteCuS
ZnZinc
Zn SphaleriteZnS
AgSilver
Ag AcanthiteAg2S
PbLead
Pb GalenaPbS

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

Bartonian - Maastrichtian
37.8 - 72.1 Ma



ID: 3002988
Laramide intrusive rocks

Age: Phanerozoic (37.8 - 72.1 Ma)

Description: Mainly intermediate to felsic compositions; some mafic

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:{granitic,dioritic}

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)
Eckel, E.B., (1938), Copper Ores Of The La Plata District, Colorado, And Their Platinum Content: Colorado Sci. Soc. Proc., V.13, No. 12, P. 647-664.
Schwartz, G.M., And Others, (1949), Disseminated Chalcopyrite With Platinum And Palladium, In Eckel, E.B., And Others, Geology And Ore Deposits Of The La Plata District, Colorado: USGS Prof. Paper 219, P. 63-65, 84-85.
Cbm Annual Report (1968), Topo Map
Werle, J. L., Ikramuddin, M., & Mutschler, F. E. (1984). Allard stock, La Plata Mountains, Colorado—an alkaline rock-hosted porphyry copper–precious metal deposit. Canadian Journal of Earth Sciences, 21(6), 630-641.
Summerlin, E. (2014). PGE mineralization at the Allard stock: Implications for the porphyry to epithermal transition, La Plata Mountains, Colorado (Auburn University MS thesis).


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