Andover Iron Mine, Andover Township, Sussex County, New Jersey, USAi
Regional Level Types | |
---|---|
Andover Iron Mine | Mine |
Andover Township | Township |
Sussex County | County |
New Jersey | State |
USA | Country |
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Latitude & Longitude (WGS84):
41° 0' 15'' North , 74° 44' 5'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Andover | 581 (2017) | 2.1km |
Newton | 7,979 (2017) | 6.2km |
Lake Mohawk | 9,916 (2017) | 6.5km |
Hopatcong Hills | 16,267 (2017) | 8.6km |
Sparta | 19,722 (2018) | 8.7km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
Club | Location | Distance |
---|---|---|
Morris Museum Mineralogical Society | Morristown, New Jersey | 31km |
Monroe County Earth Science Association | Stroudsburg, Pennsylvania | 39km |
North Jersey Mineralogical Society, Inc. | Paterson, New Jersey | 48km |
New Jersey Mineralogical Society, Inc | Mountainside, New Jersey | 49km |
Mindat Locality ID:
12281
Long-form identifier:
mindat:1:2:12281:9
GUID (UUID V4):
80debc76-67d6-49d1-811b-4514906ebbda
An iron mine in hematite and magnetite ore. Located 1ΒΎ miles NNE of Andover Borough in Andover Township. Workings were an open pit 70 feet deep and 1,000 feet long. This mine was operational by 1762. Worked 1847-1863, again from 1879 to 1880. One of three mines near Andover.
The Andover Iron Mine is fundamentally different than all but a very few of the very many iron deposits in northern New Jersey. The mine is a long, narrow pit, now thickly forested. The configuration of the pitβs floor can only be roughly estimated because back fill and debris, including some very large fragments, has obscured much of it. The mine predates the Revolutionary War but its principal period of activity began circa 1847 after it was acquired by the Trenton Iron Company, owned by Abram S. Hewitt and Peter Cooper. The renovation and operation of the mine was directed by Phillip R. George, my Uncle Rayβs grandfather, who was descended from a long line of Cornish mine captains and who had recently come to America from Redruth, Cornwall. Mr. George remained Superintendent at Andover until 1854 when he was transferred to the Ringwood Mines.
The Andover Mine ore body is interpreted as a stratiform body that occupies a small, local graben (Volkert and Puffer, 2001). Within this graben the ore is underlain by approximately 85 feet of Neoprotorozoic greenschist-facies clastic metasediments. These are assigned to the Chestnut Hill Formation, a group of sedimentary and volcanic rocks best exposed near the Delaware River just north of Easton, Pa that was named by Drake (1984). The sediments in the graben resulted from very local erosion as they contain detrital goldmanite, the vanadian garnet abundant in the skarns at the nearby Sulphur Hill Mine.
Volkert and Puffer (2001) describe the ore at Andover as mostly hematite and lesser magnetite with calcite and jasper. Puffer (2001) likens the ore to banded iron formation.
Along the middle portion of the pit the southeast wall is very straight for at least 250 feet. In this area the limit of both the ore and the pit was marked by a fault. This fracture contained a narrow vein filled mostly by quartz and calcite. The calcite ranged from off white to pale salmon colored. The vein ranged in thickness from nil, just sheared hematite-rich gneiss, to several inches. In at least 2 local areas the vein assemblage included a very dark gray sphalerite which contained tiny, exsolution inclusions of a copper sulphide. Such exsolution inclusions are common in sphalerite and are usually chalcopyrite but in this case freshly broken surfaces had the distinct purplish bronze color of bornite. Both of these sulphide-bearing areas had been oxidized.
The northern example was commonly referred to as the βWillemite Pocketβ. It was apparently discovered by Al Lord, a local collector, circa 1968 and by the early 1970βs was mostly worked out. The remaining void was 6 to 8 inches high and deep and approximately 3 to 4 feet long. The vein material was very siliceous. The cavities in this material were drusy quartz which was thickly encrusted with small, stubby crystals of willemite. Radiating aggregates of bladed hemimorphite crystals were also common. The willemite fluoresced in short wave ultraviolet light a bright orange-yellow.
The southern example, approximately 150 feet to the south of the βwillemite pocketβ, was more copper-rich. Dioptase occurred as micro size crystals, mostly elongated prisms in individuals and radiating or spherical aggregates. A very few crystals, including the best one seen by this author, were equant, miniature versions of the well known examples from Tseumeb.
Aurichalcite, with the typical rich, light blue color, graded into similar species (?), one white, possibly hydrozincite, and another distinctly green, perhaps rosasite.
Malachite, in groups of radiating crystals, was locally present locally. The entire copper-rich area of the vein was approximately 2 to 3 feet square and less than a foot deep.
The vein mineralization, that includes the sulphides, is later than the iron ore. It is probably Paleozoic age (Permian ?). It may be related to the widespread hydrothermal overprint of the region that produced numerous minor Mississippi Valley Type lead-zinc and alpine cleft occurrences (Cummings, 1997).
The willemite from the Andover Iron Mine is not the same material that was reported from this area in the 19th century. That willemite occurrence was at the Sulphur Hill Mine, less than 1000 feet northeast of the northern end of the Andover Mine pit. Because of the proximity of these two mines and a shared access road there has been some confusion in the assignment of some mineral species even though the deposits are very distinct in their age, character and origin. There has been a tendency to lump both mines under the heading βAndoverβ or βAndover Iron Mineβ. Some of the species listed in Mindat for the Andover Iron Mine, including carbonate-apatite, garnet group and leadhillite, are suspect, should probably be assigned to the Sulphur Hill Mine and should be rigorously reviewed.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
13 valid minerals.
Detailed Mineral List:
β 'Apatite' Formula: Ca5(PO4)3(Cl/F/OH) References: |
β 'Apatite var. Collophane' References: |
β Aurichalcite Formula: (Zn,Cu)5(CO3)2(OH)6 References: |
β Azurite Formula: Cu3(CO3)2(OH)2 References: Ostrander, Charles W., Price, Jr, Walter E. (1940) Minerals of Maryland. The Natural History Society of Maryland, Baltimore, Maryland, USA. 14pp.Identified by A. M.: Visual Identification |
β Bornite Formula: Cu5FeS4 References: |
β Calcite Formula: CaCO3 |
β Dioptase Formula: CuSiO3 · H2O References: |
β 'Garnet Group' Formula: X3Z2(SiO4)3 References: |
β Hematite Formula: Fe2O3 |
β Hemimorphite Formula: Zn4Si2O7(OH)2 · H2O References: |
β Leadhillite ? Formula: Pb4(CO3)2(SO4)(OH)2 Description: The locality assignment of leadhillite is questioned and it has been suggested that the actual locality is from the Sulphur Hill Mine, also in Andover Township. However, there are no data substantiating leadhillite occurring in New Jersey. References: |
β Magnetite Formula: Fe2+Fe3+2O4 |
β Malachite Formula: Cu2(CO3)(OH)2 References: |
β Quartz Formula: SiO2 References: |
β Sphalerite Formula: ZnS |
β Willemite Formula: Zn2SiO4 References: |
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
β | Bornite | 2.BA.15 | Cu5FeS4 |
β | Sphalerite | 2.CB.05a | ZnS |
Group 4 - Oxides and Hydroxides | |||
β | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
β | Hematite | 4.CB.05 | Fe2O3 |
β | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
β | Calcite | 5.AB.05 | CaCO3 |
β | Azurite | 5.BA.05 | Cu3(CO3)2(OH)2 |
β | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
β | Aurichalcite | 5.BA.15 | (Zn,Cu)5(CO3)2(OH)6 |
β | Leadhillite ? | 5.BF.40 | Pb4(CO3)2(SO4)(OH)2 |
Group 9 - Silicates | |||
β | Willemite | 9.AA.05 | Zn2SiO4 |
β | Hemimorphite | 9.BD.10 | Zn4Si2O7(OH)2 Β· H2O |
β | Dioptase | 9.CJ.30 | CuSiO3 Β· H2O |
Unclassified | |||
β | 'Apatite var. Collophane' | - | Ca5(PO4)3(Cl/F/OH) |
β | 'Garnet Group' | - | X3Z2(SiO4)3 |
β | 'Apatite' | - | Ca5(PO4)3(Cl/F/OH) |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Aurichalcite | (Zn,Cu)5(CO3)2(OH)6 |
H | β Azurite | Cu3(CO3)2(OH)2 |
H | β Dioptase | CuSiO3 · H2O |
H | β Hemimorphite | Zn4Si2O7(OH)2 · H2O |
H | β Leadhillite | Pb4(CO3)2(SO4)(OH)2 |
H | β Malachite | Cu2(CO3)(OH)2 |
H | β Apatite | Ca5(PO4)3(Cl/F/OH) |
C | Carbon | |
C | β Aurichalcite | (Zn,Cu)5(CO3)2(OH)6 |
C | β Azurite | Cu3(CO3)2(OH)2 |
C | β Calcite | CaCO3 |
C | β Leadhillite | Pb4(CO3)2(SO4)(OH)2 |
C | β Malachite | Cu2(CO3)(OH)2 |
O | Oxygen | |
O | β Aurichalcite | (Zn,Cu)5(CO3)2(OH)6 |
O | β Azurite | Cu3(CO3)2(OH)2 |
O | β Calcite | CaCO3 |
O | β Dioptase | CuSiO3 · H2O |
O | β Hematite | Fe2O3 |
O | β Hemimorphite | Zn4Si2O7(OH)2 · H2O |
O | β Leadhillite | Pb4(CO3)2(SO4)(OH)2 |
O | β Magnetite | Fe2+Fe23+O4 |
O | β Malachite | Cu2(CO3)(OH)2 |
O | β Quartz | SiO2 |
O | β Willemite | Zn2SiO4 |
O | β Garnet Group | X3Z2(SiO4)3 |
O | β Apatite | Ca5(PO4)3(Cl/F/OH) |
F | Fluorine | |
F | β Apatite | Ca5(PO4)3(Cl/F/OH) |
Si | Silicon | |
Si | β Dioptase | CuSiO3 · H2O |
Si | β Hemimorphite | Zn4Si2O7(OH)2 · H2O |
Si | β Quartz | SiO2 |
Si | β Willemite | Zn2SiO4 |
Si | β Garnet Group | X3Z2(SiO4)3 |
P | Phosphorus | |
P | β Apatite | Ca5(PO4)3(Cl/F/OH) |
S | Sulfur | |
S | β Bornite | Cu5FeS4 |
S | β Leadhillite | Pb4(CO3)2(SO4)(OH)2 |
S | β Sphalerite | ZnS |
Cl | Chlorine | |
Cl | β Apatite | Ca5(PO4)3(Cl/F/OH) |
Ca | Calcium | |
Ca | β Calcite | CaCO3 |
Ca | β Apatite | Ca5(PO4)3(Cl/F/OH) |
Fe | Iron | |
Fe | β Bornite | Cu5FeS4 |
Fe | β Hematite | Fe2O3 |
Fe | β Magnetite | Fe2+Fe23+O4 |
Cu | Copper | |
Cu | β Aurichalcite | (Zn,Cu)5(CO3)2(OH)6 |
Cu | β Azurite | Cu3(CO3)2(OH)2 |
Cu | β Bornite | Cu5FeS4 |
Cu | β Dioptase | CuSiO3 · H2O |
Cu | β Malachite | Cu2(CO3)(OH)2 |
Zn | Zinc | |
Zn | β Aurichalcite | (Zn,Cu)5(CO3)2(OH)6 |
Zn | β Hemimorphite | Zn4Si2O7(OH)2 · H2O |
Zn | β Sphalerite | ZnS |
Zn | β Willemite | Zn2SiO4 |
Pb | Lead | |
Pb | β Leadhillite | Pb4(CO3)2(SO4)(OH)2 |
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Appalachian BasinBasin
- Laurentides DomainDomain
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