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Silver Cliff Mine (Rochelle Mine), Lusk, Niobrara Co., Wyoming, USAi
Regional Level Types
Silver Cliff Mine (Rochelle Mine)Mine
Lusk- not defined -
Niobrara Co.County
WyomingState
USACountry

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Key
Latitude & Longitude (WGS84):
42° 45' 42'' North , 104° 28' 10'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Lusk1,628 (2017)1.4km


A former U-Cu-Au-Ra-Ag occurrence/mine located in sec. 7, T32N, R63W, 6th Principal Meridian, 1.4 km (0.9 mile) W of Lusk. Discovered in 1879. Property comprises 160 acres. First produced in 1880 and closed about 1953. Leased by Joel L. Starnes, Lusk, Wyoming (1955); lessee: Wyoming Uranium Company (1950-1955); lessee: E.D. Lorimer (1918-1922). MRDS database stated accuracy for this location is 50 meters. "Produced uranium in the 1920's and again in the early 1950's. Some Cu, Ag & Au were also recovered in 1879 and in the early 1880's.". Located on the top of the elongated hill W of Lusk. At least 5 workings and an adit are shown near the center of sec. 7 on the Lusk 24K topo map.

Mineralization is an U deposit with calcite veins and U occurring in sandstone. "The mineralization lies within and adjacent to a high-angle reverse fault that strikes N15E. It also occurs as a blanket deposit in iron-stained sandstone at the base of the Paleozoic rocks adjacent to the mineralized fault." "Most of the hill consists of Precambrian metamorphic rocks (muscovite schist interbedded with thin lenses of limy schist) unconformably overlain by calcareous Flathead(?) Sandstone or possibly Guernsey(?) Formation sandstone. The sandstone dips southeast.". Local rocks include Meta-sedimentary and metavolcanic rocks.

Regional geologic structures include the Hartville Uplift.

Workings include underground openings. Following the discovery of Ag-Cu-Au mineralization in 1879, a 285-foot-deep shaft was sunk, and a 1,200-foot inclined adit was driven to the bottom of the shaft. Five levels were established with at least 1,600 feet of drifts.". Ultimately, there were 4 large pits, and the 285 foot shaft with 5 level.

Analytical data results: Select samples contained 0.5% Au. Result: several samples yielded <0.02 to 10.88% Cu; 0.16 to 15.04% Ag; and 0.001 to 3.39% U3O8.

Production included $34,000 (period values) Ra (1922).

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


18 valid minerals.

Detailed Mineral List:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Reference: USGS Bull 1009A
Andradite
Formula: Ca3Fe3+2(SiO4)3
Reference: USGS Bull 1009A
Azurite
Formula: Cu3(CO3)2(OH)2
Reference: Rocks & Minerals 76:388; USGS Bull 1009A; American Mineralogist (1926) 11:155-164
Calcite
Formula: CaCO3
Reference: USGS Bull 1009A; American Mineralogist (1926) 11:155-164; Page, L. R.; Stocking, H. E.; Smith, H. B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. USGS Professional Paper 300 pp97-103
Chalcocite
Formula: Cu2S
Reference: Rocks & Minerals 76:388; USGS Bull 1009A; USGS Bull 315; American Mineralogist (1926) 11:155-164
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Reference: USGS Bull 1009A; USGS Bull 315; American Mineralogist (1926) 11:155-164
Clinozoisite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Reference: USGS Bull 1009A
Copper
Formula: Cu
Reference: USGS Bull 1009A; American Mineralogist (1926) 11:155-164
Cuprite
Formula: Cu2O
Reference: USGS Bull 1009A
'Feldspar Group'
Reference: USGS Bull 1009A
'Feldspar Group var: Perthite'
Reference: USGS Bull 1009A
'Gummite'
Reference: Rocks & Minerals 76:388; USGS Bull 1009A
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: USGS Bull 315
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: USGS Bull 1009A; USGS Bull 315
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Rocks & Minerals 76:388; USGS Bull 1009A; USGS Bull 315; American Mineralogist (1926) 11:155-164
Metatorbernite
Formula: Cu(UO2)2(PO4)2 · 8H2O
Reference: Rocks & Minerals 76:388; USGS Bull 1009A
Pyrite
Formula: FeS2
Reference: USGS Bull 1009A; Page, L. R.; Stocking, H. E.; Smith, H. B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. USGS Professional Paper 300 pp97-103
Quartz
Formula: SiO2
Reference: American Mineralogist (1926) 11:155-164
Silver
Formula: Ag
Description: Native
Reference: Rocks & Minerals 76:388; USGS Bull 1009A; USGS Bull 315
'Tourmaline'
Formula: A(D3)G6(Si6O18)(BO3)3X3Z
Reference: USGS Bull 1009A
Uraninite
Formula: UO2
Reference: Rocks & Minerals 76:388; USGS Bull 1009A; American Mineralogist (1926) 11:155-164; Page, L. R.; Stocking, H. E.; Smith, H. B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. USGS Professional Paper 300 pp97-103
Uraninite var: Pitchblende
Formula: UO2
Reference: Rocks & Minerals 76:388; USGS Bull 1009A; American Mineralogist (1926) 11:155-164; Page, L. R.; Stocking, H. E.; Smith, H. B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. USGS Professional Paper 300 pp97-103
Uranophane
Formula: Ca(UO2)2(SiO3OH)2 · 5H2O
Reference: Rocks & Minerals 76:388; Outerbridge, W.F., et al (1960), Weeksite, a new uranium silicate from the Thomas Range, Juab County, Utah, Am.Min.: 45: 39-52;; USGS Bull 1009A; American Mineralogist (1926) 11:155-164; Page, L. R.; Stocking, H. E.; Smith, H. B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. USGS Professional Paper 300 pp97-103
Weeksite
Formula: K2(UO2)2(Si5O13) · 4H2O
Reference: Outerbridge, W.F., et al (1960), Weeksite, a new uranium silicate from the Thomas Range, Juab County, Utah, Am.Min.: 45: 39-52;

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Chalcocite2.BA.05Cu2S
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Cuprite4.AA.10Cu2O
Quartz4.DA.05SiO2
Uraninite4.DL.05UO2
var: Pitchblende4.DL.05UO2
Group 5 - Nitrates and Carbonates
Azurite5.BA.05Cu3(CO3)2(OH)2
Calcite5.AB.05CaCO3
Malachite5.BA.10Cu2(CO3)(OH)2
Group 8 - Phosphates, Arsenates and Vanadates
Metatorbernite8.EB.10Cu(UO2)2(PO4)2 · 8H2O
Group 9 - Silicates
Actinolite9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Andradite9.AD.25Ca3Fe3+2(SiO4)3
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Clinozoisite9.BG.05a{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Uranophane9.AK.15Ca(UO2)2(SiO3OH)2 · 5H2O
Weeksite9.AK.30K2(UO2)2(Si5O13) · 4H2O
Unclassified Minerals, Rocks, etc.
'Feldspar Group'-
'var: Perthite'-
'Gummite'-
'Limonite'-(Fe,O,OH,H2O)
'Tourmaline'-A(D3)G6(Si6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Copper1.1.1.3Cu
Silver1.1.1.2Ag
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X
Cuprite4.1.1.1Cu2O
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Uraninite5.1.1.1UO2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Azurite16a.2.1.1Cu3(CO3)2(OH)2
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
AB2(XO4)2·xH2O, containing (UO2)2+
Metatorbernite40.2a.13.2Cu(UO2)2(PO4)2 · 8H2O
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Andradite51.4.3b.1Ca3Fe3+2(SiO4)3
Group 53 - NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)
Uranophane53.3.1.2Ca(UO2)2(SiO3OH)2 · 5H2O
Weeksite53.3.2.1K2(UO2)2(Si5O13) · 4H2O
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)
Clinozoisite58.2.1a.4{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
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.
Actinolite-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
'Feldspar Group'-
'var: Perthite'-
'Gummite'-
Kaolinite-Al2(Si2O5)(OH)4
'Limonite'-(Fe,O,OH,H2O)
'Tourmaline'-A(D3)G6(Si6O18)(BO3)3X3Z
Uraninite
var: Pitchblende
-UO2

List of minerals for each chemical element

HHydrogen
H AzuriteCu3(CO3)2(OH)2
H MalachiteCu2(CO3)(OH)2
H MetatorberniteCu(UO2)2(PO4)2 · 8H2O
H UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
H Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
H WeeksiteK2(UO2)2(Si5O13) · 4H2O
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H Limonite(Fe,O,OH,H2O)
H KaoliniteAl2(Si2O5)(OH)4
BBoron
B TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
CCarbon
C AzuriteCu3(CO3)2(OH)2
C MalachiteCu2(CO3)(OH)2
C CalciteCaCO3
OOxygen
O AzuriteCu3(CO3)2(OH)2
O MalachiteCu2(CO3)(OH)2
O MetatorberniteCu(UO2)2(PO4)2 · 8H2O
O UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
O Uraninite (var: Pitchblende)UO2
O CalciteCaCO3
O CupriteCu2O
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
O WeeksiteK2(UO2)2(Si5O13) · 4H2O
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
O AndraditeCa3Fe23+(SiO4)3
O Limonite(Fe,O,OH,H2O)
O KaoliniteAl2(Si2O5)(OH)4
O QuartzSiO2
O UraniniteUO2
MgMagnesium
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
AlAluminium
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Al Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Al KaoliniteAl2(Si2O5)(OH)4
SiSilicon
Si UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Si WeeksiteK2(UO2)2(Si5O13) · 4H2O
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
Si AndraditeCa3Fe23+(SiO4)3
Si KaoliniteAl2(Si2O5)(OH)4
Si QuartzSiO2
PPhosphorus
P MetatorberniteCu(UO2)2(PO4)2 · 8H2O
SSulfur
S ChalcociteCu2S
S PyriteFeS2
KPotassium
K WeeksiteK2(UO2)2(Si5O13) · 4H2O
CaCalcium
Ca UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Ca CalciteCaCO3
Ca Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Ca AndraditeCa3Fe23+(SiO4)3
FeIron
Fe PyriteFeS2
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe AndraditeCa3Fe23+(SiO4)3
Fe Limonite(Fe,O,OH,H2O)
CuCopper
Cu AzuriteCu3(CO3)2(OH)2
Cu ChalcociteCu2S
Cu MalachiteCu2(CO3)(OH)2
Cu MetatorberniteCu(UO2)2(PO4)2 · 8H2O
Cu CupriteCu2O
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Cu CopperCu
AgSilver
Ag SilverAg
UUranium
U MetatorberniteCu(UO2)2(PO4)2 · 8H2O
U UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
U Uraninite (var: Pitchblende)UO2
U WeeksiteK2(UO2)2(Si5O13) · 4H2O
U UraniniteUO2

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A) In-text Citation No.
American Mineralogist (1926): 11: 155-164.
USGS Oil & Gas Preliminary Map 102 (1949).
Wyoming Geological Survey (1952), Bulletin 45: 167.
Wilmarth, V.R. and Johnson, D.H. (1954), Contribution to the Geology of Uranium, Uranophane at Silver Cliff Mine, Lusk, Wyoming, USGS Bulletin 1009-A.
Page, L. R., Stocking, H. E., Smith, H. B. (1956), Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. USGS Professional Paper 300: 97-103.
Shaw, J.F., Wilson, S.R., Storms, W.R., Baroch, C.T., and Bauerle, L.C. (1956), Quarterly report on reconnaissance, exploration, and extraction of selenium (GSA Contract DMP-97), Research Report No. 36.8, 13 p. (unpublished report in File Room, Bldg. 20, Denver Federal Center as of 8/2010)
DMEA (1957), Docket No. 4704, 95 pp.
U.S. Atomic Energy Commission (1957), Annual Report RME-3148, 1956-1957: 4.
Conservation Division Comp. Date (1959), (04-16-1959).
Outerbridge, W.F., et al (1960), Weeksite, a new uranium silicate from the Thomas Range, Juab County, Utah, American Mineralogist: 45: 39-52.
Hausel (1997), Copper, lead, zinc, molybdenum, and associated metal deposits of Wyoming: Wyoming Geological Survey Bulletin 70: 72-73.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10108466.
U.S. Bureau of Mines, Minerals Availability System (MAS) file #0560270062.
RME 1002 Tepco files USGS (unverified).
DMEA Docket No. 3735, 65 p.
USGS Bulletin 315.

Other Databases

USGS MRDS Record:10108466

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