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BEMCO prospect (Charlotte Mine), Cranberry Lake, Byram Township, Sussex Co., New Jersey, USAi
Regional Level Types
BEMCO prospect (Charlotte Mine)Prospect
Cranberry LakeLake
Byram TownshipTownship
Sussex Co.County
New JerseyState
USACountry

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Key
Latitude & Longitude (WGS84):
40° 56' 21'' North , 74° 44' 30'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Stanhope3,410 (2017)4.9km
Andover581 (2017)5.2km
Netcong3,253 (2017)5.4km
Hopatcong Hills16,267 (2017)6.0km
Hopatcong14,510 (2017)6.9km


A uranium-RRE deposit in a semi-basic pegmatite, located near Cranberry Lake. Owned by the Byram Exploration & Mining Co. (BEMCO), Inc. Workings are comprised of shallow open cuts, a shaft and a raise with an inclined haulage way.

The BEMCO Mine uranium/rare earth deposit was discovered during the uranium rush of the 1950’s. With little governmental interference and no NIMBY’ism a short adit, sloped downward, guaranteeing flooding of the inner end, and a very short raise to the surface were driven into the hillside. On top of the hill a shallow trench was excavated on the outcrop. When I first saw this site, circa 1958-9, I remember guys with geiger counters taking readings, making notes and hammering off samples. By the early 1960’s , after diamond drilling failed to indicate any down dip extension, activity ceased. Once, when I was there in the late 60’s or early 70’s I encountered 2 of the original owners/workers, puttering around. I can’t remember if they told me why. Whatever it was nothing came of it.

More recently the area became part of Allamuchy State Park. The uranium mine was rediscovered by the local population. In the changed social climate radiation hysteria took hold and the State backfilled the adit and placed steel bars over the raise.

The Bemco deposit is described by Vassiliou (1980). A thin, magnetite-rich band containing zircon and rare earth minerals occurs at the contact between a pegmatite dike and the enclosing sulphidic pyroxene gneiss. A variety of minerals have been attributed to the BEMCO mine but only magnetite and black zircon, enclosing cores of fergusonite and uranothorite, are common. Jaffe and Molinski (1962) described spenceite, now tritomite–(Y), the second occurrence of this species.

There are a number of magnetite plus U/REE deposits scattered through the Reading Prong Highlands. The best known is the Doverite-bearing occurrence in the Scrub Oaks Mine. There is a widespread intimate relationship between these U/REE – bearing magnetite concentrations and pegmatites (Volkert, et al, 2005). U-Pb ages range between 990 and 940 MA.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


14 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: US Dept. of Int. Bur. of Mines ROI #6885 (1967):12.
Albite var: Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Reference: US Dept. of Int. Bur. of Mines ROI #6885 (1967):12.
'Allanite Group'
Formula: {A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
Reference: A Quest for New Jersey Minerals, Robert Speiser(1978).
'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Reference: US Dept. of Int. Bur. of Mines ROI #6885 (1967):13.
Chalcopyrite
Formula: CuFeS2
Reference: US Dept. of Int. Bur. of Mines ROI #6885 (1967):13.
'Fergusonite'
Reference: US Dept. of Int. Bur. of Mines ROI #6885 (1967):13.
Fluorite
Formula: CaF2
Reference: US Dept. of Int. Bur. of Mines ROI #6885 (1967):12.
'Hornblende'
Reference: A Quest for New Jersey Minerals, Robert Speiser(1978).
Magnetite
Formula: Fe2+Fe3+2O4
Reference: A Quest for New Jersey Minerals, Robert Speiser(1978).
'Mica Group'
Reference: A Quest for New Jersey Minerals, Robert Speiser(1978).
Opal
Formula: SiO2 · nH2O
Reference: collected by David Bernstein- 10/2009
Opal var: Opal-AN
Formula: SiO2 · nH2O
Reference: collected by David Bernstein- 10/2009
Orthoclase
Formula: K(AlSi3O8)
Reference: US Dept. of Int. Bur. of Mines ROI #6885 (1967):12.
Pyrite
Formula: FeS2
Reference: US Dept. of Int. Bur. of Mines ROI #6885 (1967):13.
Pyrrhotite
Formula: Fe7S8
Reference: US Dept. of Int. Bur. of Mines ROI #6885 (1967):13.
Quartz
Formula: SiO2
Reference: US Dept. of Int. Bur. of Mines ROI #6885 (1967):12.
Samarskite-(Y)
Formula: YFe3+Nb2O8
Reference: A Quest for New Jersey Minerals, Robert Speiser(1978).
Thorite
Formula: Th(SiO4)
Reference: US Dept. of Int. Bur. of Mines ROI #6885 (1967):13.
Tritomite-(Y)
Formula: Y5(SiO4,BO4)3(O,OH,F)
Reference: A Quest for New Jersey Minerals, Robert Speiser(1978).
Uraninite
Formula: UO2
Reference: A Quest for New Jersey Minerals, Robert Speiser(1978).
Zircon
Formula: Zr(SiO4)
Reference: US Dept. of Int. Bur. of Mines ROI #6885 (1967):12.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Opal4.DA.10SiO2 · nH2O
var: Opal-AN4.DA.10SiO2 · nH2O
Quartz4.DA.05SiO2
Samarskite-(Y)4.DB.25YFe3+Nb2O8
Uraninite4.DL.05UO2
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
var: Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
Orthoclase9.FA.30K(AlSi3O8)
Thorite9.AD.30Th(SiO4)
Tritomite-(Y)9.AH.25Y5(SiO4,BO4)3(O,OH,F)
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Allanite Group'-{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Fergusonite'-
'Hornblende'-
'Mica Group'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Uraninite5.1.1.1UO2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
ABO4
Samarskite-(Y)8.1.11.1YFe3+Nb2O8
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in >[6] coordination
Thorite51.5.2.3Th(SiO4)
Zircon51.5.2.1Zr(SiO4)
Group 54 - NESOSILICATES Borosilicates and Some Beryllosilicates
Borosilicates and Some Beryllosilicates with B in [4] coordination
Tritomite-(Y)54.2.5.2Y5(SiO4,BO4)3(O,OH,F)
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Orthoclase76.1.1.1K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
Albite
var: Oligoclase
-(Na,Ca)[Al(Si,Al)Si2O8]
'Allanite Group'-{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Fergusonite'-
'Hornblende'-
'Mica Group'-
Opal
var: Opal-AN
-SiO2 · nH2O

List of minerals for each chemical element

HHydrogen
H Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
H Tritomite-(Y)Y5(SiO4,BO4)3(O,OH,F)
H ApatiteCa5(PO4)3(Cl/F/OH)
H Opal (var: Opal-AN)SiO2 · nH2O
H OpalSiO2 · nH2O
BBoron
B Tritomite-(Y)Y5(SiO4,BO4)3(O,OH,F)
OOxygen
O UraniniteUO2
O Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
O MagnetiteFe2+Fe23+O4
O Tritomite-(Y)Y5(SiO4,BO4)3(O,OH,F)
O Samarskite-(Y)YFe3+Nb2O8
O QuartzSiO2
O OrthoclaseK(AlSi3O8)
O Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
O AlbiteNa(AlSi3O8)
O ZirconZr(SiO4)
O ThoriteTh(SiO4)
O ApatiteCa5(PO4)3(Cl/F/OH)
O Opal (var: Opal-AN)SiO2 · nH2O
O OpalSiO2 · nH2O
FFluorine
F Tritomite-(Y)Y5(SiO4,BO4)3(O,OH,F)
F FluoriteCaF2
F ApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
Na Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Na AlbiteNa(AlSi3O8)
AlAluminium
Al OrthoclaseK(AlSi3O8)
Al Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Al AlbiteNa(AlSi3O8)
SiSilicon
Si Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
Si Tritomite-(Y)Y5(SiO4,BO4)3(O,OH,F)
Si QuartzSiO2
Si OrthoclaseK(AlSi3O8)
Si Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Si AlbiteNa(AlSi3O8)
Si ZirconZr(SiO4)
Si ThoriteTh(SiO4)
Si Opal (var: Opal-AN)SiO2 · nH2O
Si OpalSiO2 · nH2O
PPhosphorus
P ApatiteCa5(PO4)3(Cl/F/OH)
SSulfur
S ChalcopyriteCuFeS2
S PyriteFeS2
S PyrrhotiteFe7S8
ClChlorine
Cl ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
K OrthoclaseK(AlSi3O8)
CaCalcium
Ca Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Ca FluoriteCaF2
Ca ApatiteCa5(PO4)3(Cl/F/OH)
FeIron
Fe MagnetiteFe2+Fe23+O4
Fe Samarskite-(Y)YFe3+Nb2O8
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
Fe PyrrhotiteFe7S8
CuCopper
Cu ChalcopyriteCuFeS2
YYttrium
Y Tritomite-(Y)Y5(SiO4,BO4)3(O,OH,F)
Y Samarskite-(Y)YFe3+Nb2O8
ZrZirconium
Zr ZirconZr(SiO4)
NbNiobium
Nb Samarskite-(Y)YFe3+Nb2O8
ThThorium
Th ThoriteTh(SiO4)
UUranium
U UraniniteUO2

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Jaffe, H. W., and Molinski, V. J. (1962), Spenceite, The Yttrium Analogue of Tritomite From Sussex County, New Jersey. The American Mineralogist: 47: 9–15.
Williams, R.L. (1967), Reconnaissance of Yttrium and Rare Earth Element Resources in Northern New Jersey, US Department of the Interior, Bureau of Mines, Report of Investigation (ROI) 6885.
Speiser, Robert (1978), A Quest for New Jersey Minerals: 17.
Vassiliou, A. H. (1980), Uranium and Rare Earth Mineralization at the BEMCO Mine Near Cranberry Lake, New Jersey, in Manspeizer, W., Ed., field Studies of New Jersey Geology and Guide to Field Trips: 52nd Annual Meeting of the New York State Geological Association: 192–199.
Volkert, R.A., Zartman, R.E., and Moore, P.B. (2005), U – Pb Geochronology of Mesoproterozoic Postorogenic Rocks and Implications for Post-Ottawan Magmatism and Metallogenesis, New Jersey Highlands and Contiguous Areas, USA. Precambrian Research: 139: 1–19. (and references therein)


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