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Forest of Dean Mine, Fort Montgomery, Town of Highlands, Orange County, New York, USA i
Regional Level Types
Forest of Dean Mine Mine
Fort Montgomery - not defined -
Town of Highlands Township
Orange County County
New York State
USA Country

Regional Level Types
Forest of Dean Mine	Mine
Fort Montgomery	- not defined -
Town of Highlands	Township
Orange County	County
New York	State
USA	Country

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View of the Partially Flooded Mine Site

Forest of Dean Mine, Fort Montgomery, Town of Highlands, Orange County, New York, USA

Magnetite, etc.

Forest of Dean Mine, Fort Montgomery, Town of Highlands, Orange County, New York, USA

Magnetite, etc.

Forest of Dean Mine, Fort Montgomery, Town of Highlands, Orange County, New York, USA

View of the Partially Flooded Mine Site

Forest of Dean Mine, Fort Montgomery, Town of Highlands, Orange County, New York, USA

Magnetite, etc.

Forest of Dean Mine, Fort Montgomery, Town of Highlands, Orange County, New York, USA

Magnetite, etc.

Forest of Dean Mine, Fort Montgomery, Town of Highlands, Orange County, New York, USA

View of the Partially Flooded Mine Site

Forest of Dean Mine, Fort Montgomery, Town of Highlands, Orange County, New York, USA

Magnetite, etc.

Forest of Dean Mine, Fort Montgomery, Town of Highlands, Orange County, New York, USA

Latitude & Longitude (WGS84):

41° 20' 52'' North , 74° 2' 29'' West

Latitude & Longitude (decimal):

G#: dr775phtt

Type:

Köppen climate type:

Dfa : Hot-summer humid continental climate

Nearest Settlements:

Place	Population	Distance
Fort Montgomery	1,571 (2017)	4.9km
Woodbury	10,879 (2017)	5.7km
Highland Falls	3,841 (2017)	6.7km
Central Valley	1,810 (2017)	6.9km
Highland Mills	3,957 (2017)	7.1km

Nearest Clubs:
Local clubs are the best way to get access to collecting localities

Club	Location	Distance
Orange County Mineral Society	Middletown, New York	34km
Mid-Hudson Valley Gem and Mineral Society Inc.	Poughkeepsie, New York	40km
North Jersey Mineralogical Society, Inc.	Paterson, New Jersey	49km
Danbury Mineralogical Society	Danbury, Connecticut	49km

Mindat Locality ID:

11207

Long-form identifier:

mindat:1:2:11207:0

GUID (UUID V4):

A very old iron mine started about 1756 and closed before 1932. One of the Forest of Dean group of mines. Owned by the Forest of Dean Iron Ore co., Hudson Iron Co. & the Fort Montgomery Iron Corp., in that order. Total output is estimated at not less than 2,000,000 tons of ore. Workings were 3,300 feet deep along the pitch.

According to Pumpelly (1886) it is located "...about 7 miles northeast of Greenwood Furnace and 3 1/2 miles northwest of Fort Montgomery." This puts it near Mine Lake and Mine Road near Camp Buckner, West Point Military Academy.

Entrance to mine is within fenced area north of the easternmost point of Mine Lake. US Army Military Reservation, inaccessible to public.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

14 valid minerals.

Detailed Mineral List:

ⓘ Albite

Formula: Na(AlSi₃O₈)

References:

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ Albite var. Oligoclase

Formula: (Na,Ca)[Al(Si,Al)Si₂O₈]

References:

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ 'Amphibole Supergroup'

Formula: AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂

References:

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ Anhydrite

Formula: CaSO₄

References:

Clarke, John M. (1921, September) The Magnetite Iron Deposits of Southeastern New York. New York State Museum Bulletin Vol. 249-250. The University of the State of New YorkIndex Map, 103.

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ 'Apatite'

Formula: Ca₅(PO₄)₃(Cl/F/OH)

References:

Clarke, John M. (1921, September) The Magnetite Iron Deposits of Southeastern New York. New York State Museum Bulletin Vol. 249-250. The University of the State of New YorkIndex Map, 103.

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ 'Biotite'

Formula: K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂

References:

Clarke, John M. (1921, September) The Magnetite Iron Deposits of Southeastern New York. New York State Museum Bulletin Vol. 249-250. The University of the State of New YorkIndex Map, 103.

ⓘ Calcite

Formula: CaCO₃

References:

Clarke, John M. (1921, September) The Magnetite Iron Deposits of Southeastern New York. New York State Museum Bulletin Vol. 249-250. The University of the State of New YorkIndex Map, 103.

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ Diopside

Formula: CaMgSi₂O₆

References:

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ Epidote

Formula: (CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)

References:

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ 'Feldspar Group'

References:

Clarke, John M. (1921, September) The Magnetite Iron Deposits of Southeastern New York. New York State Museum Bulletin Vol. 249-250. The University of the State of New YorkIndex Map, 103.

ⓘ Forsterite

Formula: Mg₂SiO₄

References:

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ Gypsum

Formula: CaSO₄ · 2H₂O

References:

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

References:

Rocks & Min.:7:68

Clarke, John M. (1921, September) The Magnetite Iron Deposits of Southeastern New York. New York State Museum Bulletin Vol. 249-250. The University of the State of New YorkIndex Map, 100-103.

Robinson, George W., Chamberlain, Steven C. (2007) Gazetteer of Major New York State Mineral Localities. Rocks & Minerals, 82 (6) 472-483 doi:10.3200/rmin.82.6.474-483

ⓘ Muscovite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

References:

Clarke, John M. (1921, September) The Magnetite Iron Deposits of Southeastern New York. New York State Museum Bulletin Vol. 249-250. The University of the State of New YorkIndex Map, 103.

ⓘ Muscovite var. Sericite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

References:

Clarke, John M. (1921, September) The Magnetite Iron Deposits of Southeastern New York. New York State Museum Bulletin Vol. 249-250. The University of the State of New YorkIndex Map, 103.

ⓘ Pargasite

Formula: NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂

References:

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ 'Pyroxene Group'

Formula: ADSi₂O₆

References:

Clarke, John M. (1921, September) The Magnetite Iron Deposits of Southeastern New York. New York State Museum Bulletin Vol. 249-250. The University of the State of New YorkIndex Map, 103.

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ Quartz

Formula: SiO₂

References:

Clarke, John M. (1921, September) The Magnetite Iron Deposits of Southeastern New York. New York State Museum Bulletin Vol. 249-250. The University of the State of New YorkIndex Map, 103.

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ 'Scapolite'

References:

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ 'Scapolite var. Wernerite'

References:

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ Spinel

Formula: MgAl₂O₄

References:

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

ⓘ Talc

Formula: Mg₃Si₄O₁₀(OH)₂

References:

Clarke, John M. (1921, September) The Magnetite Iron Deposits of Southeastern New York. New York State Museum Bulletin Vol. 249-250. The University of the State of New YorkIndex Map, 103.

ⓘ Zircon

Formula: Zr(SiO₄)

References:

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.72

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Spinel	4.BB.05	MgAl₂O₄
ⓘ	Quartz	4.DA.05	SiO₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘ	Anhydrite	7.AD.30	CaSO₄
ⓘ	Gypsum	7.CD.40	CaSO₄ · 2H₂O
Group 9 - Silicates
ⓘ	Forsterite	9.AC.05	Mg₂SiO₄
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Epidote	9.BG.05a	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
ⓘ	Diopside	9.DA.15	CaMgSi₂O₆
ⓘ	Pargasite	9.DE.15	NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂
ⓘ	Talc	9.EC.05	Mg₃Si₄O₁₀(OH)₂
ⓘ	Muscovite	9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	var. Sericite	9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	Albite	9.FA.35	Na(AlSi₃O₈)
ⓘ	var. Oligoclase	9.FA.35	(Na,Ca)[Al(Si,Al)Si₂O₈]
Unclassified
ⓘ	'Amphibole Supergroup'	-	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
ⓘ	'Feldspar Group'	-
ⓘ	'Scapolite var. Wernerite'	-
ⓘ	''	-
ⓘ	'Pyroxene Group'	-	ADSi₂O₆
ⓘ	'Apatite'	-	Ca₅(PO₄)₃(Cl/F/OH)

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
H	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
H	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
H	ⓘ Gypsum	CaSO₄ · 2H₂O
H	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Pargasite	NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂
H	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
H	ⓘ Muscovite var. Sericite	KAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
C	Carbon
C	ⓘ Calcite	CaCO₃
C	ⓘ Scapolite var. Wernerite
O	Oxygen
O	ⓘ Albite	Na(AlSi₃O₈)
O	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
O	ⓘ Anhydrite	CaSO₄
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
O	ⓘ Calcite	CaCO₃
O	ⓘ Diopside	CaMgSi₂O₆
O	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
O	ⓘ Forsterite	Mg₂SiO₄
O	ⓘ Gypsum	CaSO₄ · 2H₂O
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Albite var. Oligoclase	(Na,Ca)[Al(Si,Al)Si₂O₈]
O	ⓘ Pargasite	NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂
O	ⓘ Quartz	SiO₂
O	ⓘ Spinel	MgAl₂O₄
O	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
O	ⓘ Scapolite var. Wernerite
O	ⓘ Zircon	Zr(SiO₄)
O	ⓘ Muscovite var. Sericite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Pyroxene Group	ADSi₂O₆
O	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
F	Fluorine
F	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
F	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
F	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Na	Sodium
Na	ⓘ Albite	Na(AlSi₃O₈)
Na	ⓘ Albite var. Oligoclase	(Na,Ca)[Al(Si,Al)Si₂O₈]
Na	ⓘ Pargasite	NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂
Na	ⓘ Scapolite var. Wernerite
Mg	Magnesium
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Mg	ⓘ Diopside	CaMgSi₂O₆
Mg	ⓘ Forsterite	Mg₂SiO₄
Mg	ⓘ Pargasite	NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂
Mg	ⓘ Spinel	MgAl₂O₄
Mg	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
Al	Aluminium
Al	ⓘ Albite	Na(AlSi₃O₈)
Al	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Al	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Al	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Albite var. Oligoclase	(Na,Ca)[Al(Si,Al)Si₂O₈]
Al	ⓘ Pargasite	NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂
Al	ⓘ Spinel	MgAl₂O₄
Al	ⓘ Scapolite var. Wernerite
Al	ⓘ Muscovite var. Sericite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	Silicon
Si	ⓘ Albite	Na(AlSi₃O₈)
Si	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Si	ⓘ Diopside	CaMgSi₂O₆
Si	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Si	ⓘ Forsterite	Mg₂SiO₄
Si	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Albite var. Oligoclase	(Na,Ca)[Al(Si,Al)Si₂O₈]
Si	ⓘ Pargasite	NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂
Si	ⓘ Quartz	SiO₂
Si	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
Si	ⓘ Scapolite var. Wernerite
Si	ⓘ Zircon	Zr(SiO₄)
Si	ⓘ Muscovite var. Sericite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Pyroxene Group	ADSi₂O₆
P	Phosphorus
P	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
S	Sulfur
S	ⓘ Anhydrite	CaSO₄
S	ⓘ Gypsum	CaSO₄ · 2H₂O
Cl	Chlorine
Cl	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Cl	ⓘ Scapolite var. Wernerite
Cl	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
K	Potassium
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
K	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
K	ⓘ Muscovite var. Sericite	KAl₂(AlSi₃O₁₀)(OH)₂
Ca	Calcium
Ca	ⓘ Anhydrite	CaSO₄
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Diopside	CaMgSi₂O₆
Ca	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Ca	ⓘ Gypsum	CaSO₄ · 2H₂O
Ca	ⓘ Albite var. Oligoclase	(Na,Ca)[Al(Si,Al)Si₂O₈]
Ca	ⓘ Pargasite	NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂
Ca	ⓘ Scapolite var. Wernerite
Ca	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Ti	Titanium
Ti	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Ti	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Fe	Iron
Fe	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Fe	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)

Other Regions, Features and Areas containing this locality

North AmericaContinent

North America PlateTectonic Plate

Appalachian BasinBasin
Laurentides DomainPassive Margin

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

The Minerals of New York City & Its Environs, New York Mineralogical Club Bull., Vol. 3, No. 1 Manchester, J.G. (1931): 72

New York State Museum Bull. Nos. 249-250 (Sep-Oct 1921), Magnetic Iron Deposits of SE NY, Clarke, John M.: Index Map, 44 & 99-105

Pumpelly, Raphael. (1886) Report on the Mining Industries of the United States. US Department of the Interior, Census Office.

Kemp, J. F. (1888) A diorite dike at Forest of Dean, Orange County, New York. American Journal of Science, s3-35 (208). 331-332 doi:10.2475/ajs.s3-35.208.331

Williams, David (1906) The Iron Age, Vol. 77: 1972-75.

Stoltz, Guy C. (1908) The Forest of Dean Iron Mine, N.Y. Eng. and Min. Jour. 85: 1091-93.

Ref.: Rocks & Min.: 7:68;The Minerals of New York City & Its Environs, New York Mineralogical Club Bull., Vol. 3, No. 1, Manchester, J.G. (1931): 72; New York State Museum Bull. Nos. 249-250 (Sep-Oct 1921), Magnetic Iron Deposits of SE NY, Clarke, John M.: Index Map, 44 & 99-105

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Detailed Mineral List:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Other Regions, Features and Areas containing this locality

References