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Adelphi Mine, Spearfish, Lawrence County, South Dakota, USAi
Regional Level Types
Adelphi MineMine
Spearfish- not defined -
Lawrence CountyCounty
South DakotaState
USACountry

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Latitude & Longitude (WGS84):
44° 23' 50'' North , 104° 8' 0'' West
Latitude & Longitude (decimal):
44.39746,-103.86448
GRN:
N30W54
Type:
Mine
Köppen climate type:
Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Central City130 (2017)8.1km
Lead2,999 (2017)9.4km
Spearfish11,283 (2017)10.4km
Deadwood1,258 (2017)11.0km
North Spearfish2,285 (2017)12.3km
Mindat Locality ID:
44919
Long-form identifier:
mindat:1:2:44919:6
GUID (UUID V4):
0


A Au-Ag-Pb-Mn occurrence/mine located in the W½SW¼NE¼ sec. 15, T5N, R2E, BHM, on private land within a National Forest. Discovered in 1881. Year of first production was 1882. Owned by Lillian Fillmore (100%) (1976). The USGS MRDS database stated accuracy for this locality is 100 meters.

Mineralization is a polymetallic deposit. The ore body strikes N80W and dips 90N. The area is 259 HA and the depth-to-top is 2 meters. Ore body No. 1 is tabular and No. 2 is irregular. The primary mode of origin was contact metasomatism and the secondary mode was hydrothermal activity. Primary ore control was fracturing and the secondary control was bedding. Local rocks include the Pahasapa Limestone, Englewood Formation, Whitewood Limestone, Winnipeg Formation, and Deadwood Formation.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


8 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘNative Gold1.AA.05Au
ⓘNative Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
ⓘGalena2.CD.10PbS
Group 3 - Halides
ⓘChlorargyrite3.AA.15AgCl
Group 4 - Oxides and Hydroxides
ⓘHausmannite4.BB.10Mn2+Mn3+2O4
ⓘQuartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
ⓘCerussite5.AB.15PbCO3
Group 9 - Silicates
ⓘPyrope9.AD.25Mg3Al2(SiO4)3
Unclassified
ⓘ'Psilomelane'-
ⓘ'Almandine-Pyrope Series
var. Rhodolite'		-Mg3Al2(SiO4)3

List of minerals for each chemical element

CCarbon
Cⓘ CerussitePbCO3
OOxygen
Oⓘ CerussitePbCO3
Oⓘ HausmanniteMn2+Mn23+O4
Oⓘ PyropeMg3Al2(SiO4)3
Oⓘ QuartzSiO2
Oⓘ Almandine-Pyrope Series var. RhodoliteMg3Al2(SiO4)3
MgMagnesium
Mgⓘ PyropeMg3Al2(SiO4)3
Mgⓘ Almandine-Pyrope Series var. RhodoliteMg3Al2(SiO4)3
AlAluminium
Alⓘ PyropeMg3Al2(SiO4)3
Alⓘ Almandine-Pyrope Series var. RhodoliteMg3Al2(SiO4)3
SiSilicon
Siⓘ PyropeMg3Al2(SiO4)3
Siⓘ QuartzSiO2
Siⓘ Almandine-Pyrope Series var. RhodoliteMg3Al2(SiO4)3
SSulfur
Sⓘ GalenaPbS
ClChlorine
Clⓘ ChlorargyriteAgCl
MnManganese
Mnⓘ HausmanniteMn2+Mn23+O4
AgSilver
Agⓘ ChlorargyriteAgCl
Agⓘ Native SilverAg
AuGold
Auⓘ Native GoldAu
PbLead
Pbⓘ CerussitePbCO3
Pbⓘ GalenaPbS

Other Databases

Link to USGS MRDS:10153484

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate
USA

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

U.S. Bureau of Mines (1954), Black Hills Mineral Atlas, South Dakota: Part 1, Bureau of Mines Information Circular 7688.
Roberts, Willard Lincoln, Rapp, George Jr. (1965) Mineralogy of the Black Hills. Bulletin 18. South Dakota School of Mines and Technology
Shapiro, Lewis H. and Gries, J. P. (1970), Ore Deposits in Rocks of OIC and Tertiary Age of the Northern Black Hills, South Dakota Geological Survey Heavy Metals Program, Contract #14-08-00-50.
U.S. Bureau of Mines (1995), Minerals Availability System/Mineral Industry Location System (MAS/MILS), U.S. Bureau of Mines, file ID #0460810052.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
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