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Rock Creek placers, South Pass-Atlantic City Mining District, Fremont Co., Wyoming, USAi
Regional Level Types
Rock Creek placersGroup of Placers
South Pass-Atlantic City Mining DistrictMining District
Fremont Co.County
WyomingState
USACountry

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Key
Lock Map
Latitude & Longitude (WGS84):
42° 23' 32'' North , 108° 43' 44'' West
Latitude & Longitude (decimal):
Locality type:
Group of Placers
Nearest Settlements:
PlacePopulationDistance
Lander7,686 (2017)49.0km


Commodities (Major) - Gold; (Minor) - Silver; (Trace) - Mica, PGE - Platinum, Copper
Deposit Type: Stream Placer
Development Status: Producer
Deposit Model: 119: Placer Au-PGE
Structure: Large Fault
Host Rock: Gravel
Tectonic Structure: Stable Continental Interior

Deposit:: LOCATED IN THE 5.5 SEC 20,21,22 & N1/2 27,28,29 T30N,R100W-A
Deposit:: RE 3 CLAIMS
Deposit:: 75% OF THE GOLD WAS FOUND WITHIN 1FT-3FT OF BEDROCK IN A
Deposit:: CONCENTRATE WHICH IS NOT BLACK SAND
Deposit:: IN 1953 IT WAS MINED BY WYO MICA &
Commodities (Major) - Gold
Development Status: Past Producer

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


5 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:

Cassiterite
Formula: SnO2
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Chalcopyrite
Formula: CuFeS2
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Gold
Formula: Au
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Mica Group'
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Scheelite
Formula: Ca(WO4)
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Silver
Formula: Ag
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Group 4 - Oxides and Hydroxides
Cassiterite4.DB.05SnO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Scheelite7.GA.05Ca(WO4)
Unclassified Minerals, Rocks, etc.
'Mica Group'-

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
Silver1.1.1.2Ag
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
Group 4 - SIMPLE OXIDES
AX2
Cassiterite4.4.1.5SnO2
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Scheelite48.1.2.1Ca(WO4)
Unclassified Minerals, Mixtures, etc.
'Mica Group'-

List of minerals for each chemical element

OOxygen
O CassiteriteSnO2
O ScheeliteCa(WO4)
SSulfur
S ChalcopyriteCuFeS2
CaCalcium
Ca ScheeliteCa(WO4)
FeIron
Fe ChalcopyriteCuFeS2
CuCopper
Cu ChalcopyriteCuFeS2
AgSilver
Ag SilverAg
SnTin
Sn CassiteriteSnO2
WTungsten
W ScheeliteCa(WO4)
AuGold
Au GoldAu

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 Miocene
5.333 - 11.62 Ma



ID: 2850346
Upper Miocene Rocks

Age: Miocene (5.333 - 11.62 Ma)

Description: Southwest Wyoming: South end of Wind River Range--Siliceous, arkosic, and locally radioactive sandstone, claystone, and conglomerate. Fission-track age about 27 Ma. Recent work suggests that part of these deposits may be of Eocene age. Pliocene and Miocene (as originally defined 2) South Pass Formation. Saratoga Valley--White to greenish-gray tuffaceous sandstone, siltstone, and claystone; locally conglomeratic. North Park Formation; Central Wyoming: Arkosic sandstone, conglomerate, and siltstone; some light-colored tuffaceous radioactive claystone and white cherty limestone. North of Sweetwater River in Granite Mountains--Light-colored tuffaceous radioactive claystone, siltstone, sandstone, and arkose. Moonstone Formation; East Wyoming: Light-colored tuffaceous claystone, sandstone, and conglomerate. Ogallala Formation in Denver Basin.

Comments: Original map source: Green, Gregory N., and Drouillard, Patricia H., 1994, The Digital Geologic Map of Wyoming in ARC/INFO Format: U.S. Geological Survey Open-File Report 94-0425, scale 1:500,000.

Lithology: Major:{sandstone,claystone,conglomerate}, Minor:{siltstone,volcanic,limestone}

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]

Eocene
33.9 - 56 Ma



ID: 3190876
Cenozoic sedimentary rocks

Age: Eocene (33.9 - 56 Ma)

Lithology: Sedimentary rocks

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)
ARMSTRONG, F.C., 1948, PRELIMINARY REPORT ON THE GEOLOGY OF THE ATLANTIC CITY-SOUTH PASS MINING DISTRICT, WYOMING: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 15, P. 63-65.
HAUSEL, W.D., 1989, THE GEOLOGY OF WYOMING'S PRECIOUS METAL LODE
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, deposit ID #10080767.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, deposit ID #10303299.

USGS MRDS Record:10080767
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