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Bear Gulch, Tinton pegmatite District, Lawrence Co., South Dakota, USA

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Latitude & Longitude (WGS84): 44° 24' 43'' North , 104° 2' 27'' West
Latitude & Longitude (decimal): 44.41197,-104.04085
GeoHash:G#: 9xyh8kzy2
Locality type:Gulch
Köppen climate type:Dfb : Warm-summer humid continental climate


Placer operations

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

3 valid minerals.

Detailed Mineral List:

Cassiterite
Formula: SnO2
Reference: SDSMT Bull 18 Roberts and Rapp "Mineralogy of the Black Hills"
Cassiterite var: Wood Tin
Formula: SnO2
Reference: SDSMT Bull 18 Roberts and Rapp "Mineralogy of the Black Hills"
Gold
Formula: Au
Reference: SDSMT Bull 18 Roberts and Rapp "Mineralogy of the Black Hills"
Scheelite
Formula: Ca(WO4)
Reference: SDSMT Bull 18 Roberts and Rapp "Mineralogy of the Black Hills"

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Gold'1.AA.05Au
Group 4 - Oxides and Hydroxides
'Cassiterite'4.DB.05SnO2
var: Wood Tin4.DB.05SnO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Scheelite'7.GA.05Ca(WO4)

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 4 - SIMPLE OXIDES
AX2
Cassiterite4.4.1.5SnO2
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Scheelite48.1.2.1Ca(WO4)
Unclassified Minerals, Rocks, etc.
Cassiterite
var: Wood Tin
-SnO2

List of minerals for each chemical element

OOxygen
O CassiteriteSnO2
O ScheeliteCa(WO4)
O Cassiterite (var: Wood Tin)SnO2
CaCalcium
Ca ScheeliteCa(WO4)
SnTin
Sn CassiteriteSnO2
Sn Cassiterite (var: Wood Tin)SnO2
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

Eocene - Paleocene
33.9 - 66 Ma



ID: 2790286
Trachytic Intrusive Rocks

Age: Paleogene (33.9 - 66 Ma)

Description: Tan to reddish-brown, iron-stained stocks, laccoliths, sills, and dikes of trachyte, quartz trachyte, and alkalic rhyolite. Contains phenocrysts of sanidine, orrthoclase, anorthoclase, aegirine-augite and biotite in a finely crystalline orthoclase-quartz biotite groundmass.

Lithology: Major:{hypabyssal trachyte,hypabyssal quartz trachyte,hypabyssal rhyolite}

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 - Paleocene
33.9 - 66 Ma



ID: 3267774
Trachytic intrusive rocks

Age: Paleogene (33.9 - 66 Ma)

Description: Small stocks, laccoliths, sills, and dikes of iron­-staincd, reddish-brown to tan trachyte (Staatz, 1983)

Reference: Sutherland, W.M. Geologic Map Of The Sundance 30' X 60' Quadrangle, Crook And Weston Counties, Wyoming, And Lawrence And Pennington Counties, South Dakota. Wyoming State Geological Survey Map Series 78. [171]

Permian - Devonian
251.902 - 419.2 Ma



ID: 3190647
Paleozoic sedimentary rocks

Age: Phanerozoic (251.902 - 419.2 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

Localities in this Region
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USA
  • South Dakota

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